# HG changeset patch
# User Edouard Tisserant
# Date 1654068127 -7200
# Node ID e87a2daace80705b24d702fabd486935ec2d11c9
# Parent  ca312be569294eda8870ce6b8ad71a7d4c865a92# Parent  a88ac1760faf2f2d7eadc135de5324c2dbe57225
merged

diff -r a88ac1760faf -r e87a2daace80 svghmi/analyse_widget.xslt
--- a/svghmi/analyse_widget.xslt	Thu May 26 23:41:10 2022 +0200
+++ b/svghmi/analyse_widget.xslt	Wed Jun 01 09:22:07 2022 +0200
@@ -2,7 +2,7 @@
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:exsl="http://exslt.org/common" xmlns:regexp="http://exslt.org/regular-expressions" xmlns:str="http://exslt.org/strings" xmlns:func="http://exslt.org/functions" xmlns:svg="http://www.w3.org/2000/svg" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" version="1.0" extension-element-prefixes="ns func exsl regexp str dyn" exclude-result-prefixes="ns func exsl regexp str dyn svg inkscape">
   <xsl:output method="xml"/>
   <xsl:variable name="indexed_hmitree" select="/.."/>
-  <xsl:variable name="pathregex" select="'^([^\[,]+)(\[[^\]]+\])?([\d,]*)$'"/>
+  <xsl:variable name="pathregex" select="'^([^\[,]+)(\[[^\]]+\])?([-.\d,]*)$'"/>
   <xsl:template mode="parselabel" match="*">
     <xsl:variable name="label" select="@inkscape:label"/>
     <xsl:variable name="id" select="@id"/>
@@ -885,6 +885,56 @@
       <xsl:text>Boolean variable</xsl:text>
     </path>
   </xsl:template>
+  <xsl:template match="widget[@type='XYGraph']" mode="widget_desc">
+    <type>
+      <xsl:value-of select="@type"/>
+    </type>
+    <longdesc>
+      <xsl:text>XYGraph draws a cartesian trend graph re-using styles given for axis,
+</xsl:text>
+      <xsl:text>grid/marks, legends and curves.
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Elements labeled "x_axis" and "y_axis" are svg:groups containg:
+</xsl:text>
+      <xsl:text> - "axis_label" svg:text gives style an alignment for axis labels.
+</xsl:text>
+      <xsl:text> - "interval_major_mark" and "interval_minor_mark" are svg elements to be
+</xsl:text>
+      <xsl:text>   duplicated along axis line to form intervals marks.
+</xsl:text>
+      <xsl:text> - "axis_line"  svg:path is the axis line. Paths must be intersect and their
+</xsl:text>
+      <xsl:text>   bounding box is the chart wall.
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Elements labeled "curve_0", "curve_1", ... are paths whose styles are used
+</xsl:text>
+      <xsl:text>to draw curves corresponding to data from variables passed as HMI tree paths.
+</xsl:text>
+      <xsl:text>"curve_0" is mandatory. HMI variables outnumbering given curves are ignored.
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+    </longdesc>
+    <shortdesc>
+      <xsl:text>Cartesian trend graph showing values of given variables over time</xsl:text>
+    </shortdesc>
+    <path name="value" count="1+" accepts="HMI_INT,HMI_REAL">
+      <xsl:text>value</xsl:text>
+    </path>
+    <arg name="xrange" accepts="int,time">
+      <xsl:text>X axis range expressed either in samples or duration.</xsl:text>
+    </arg>
+    <arg name="xformat" count="optional" accepts="string">
+      <xsl:text>format string for X label</xsl:text>
+    </arg>
+    <arg name="yformat" count="optional" accepts="string">
+      <xsl:text>format string for Y label</xsl:text>
+    </arg>
+  </xsl:template>
   <xsl:template mode="document" match="@* | node()">
     <xsl:copy>
       <xsl:apply-templates mode="document" select="@* | node()"/>
diff -r a88ac1760faf -r e87a2daace80 svghmi/gen_dnd_widget_svg.xslt
--- a/svghmi/gen_dnd_widget_svg.xslt	Thu May 26 23:41:10 2022 +0200
+++ b/svghmi/gen_dnd_widget_svg.xslt	Wed Jun 01 09:22:07 2022 +0200
@@ -4,7 +4,7 @@
   <xsl:variable name="hmi_elements" select="//svg:*[starts-with(@inkscape:label, 'HMI:')]"/>
   <xsl:variable name="widgetparams" select="ns:GetWidgetParams()"/>
   <xsl:variable name="indexed_hmitree" select="/.."/>
-  <xsl:variable name="pathregex" select="'^([^\[,]+)(\[[^\]]+\])?([\d,]*)$'"/>
+  <xsl:variable name="pathregex" select="'^([^\[,]+)(\[[^\]]+\])?([-.\d,]*)$'"/>
   <xsl:template mode="parselabel" match="*">
     <xsl:variable name="label" select="@inkscape:label"/>
     <xsl:variable name="id" select="@id"/>
diff -r a88ac1760faf -r e87a2daace80 svghmi/gen_index_xhtml.xslt
--- a/svghmi/gen_index_xhtml.xslt	Thu May 26 23:41:10 2022 +0200
+++ b/svghmi/gen_index_xhtml.xslt	Wed Jun 01 09:22:07 2022 +0200
@@ -159,7 +159,7 @@
       </xsl:with-param>
     </xsl:apply-templates>
   </xsl:template>
-  <xsl:variable name="pathregex" select="'^([^\[,]+)(\[[^\]]+\])?([\d,]*)$'"/>
+  <xsl:variable name="pathregex" select="'^([^\[,]+)(\[[^\]]+\])?([-.\d,]*)$'"/>
   <xsl:template mode="parselabel" match="*">
     <xsl:variable name="label" select="@inkscape:label"/>
     <xsl:variable name="id" select="@id"/>
@@ -1108,6 +1108,11 @@
       <xsl:attribute name="label">
         <xsl:value-of select="substring(@inkscape:label,2)"/>
       </xsl:attribute>
+      <xsl:if test="string-length(text()) &gt; 0">
+        <line>
+          <xsl:value-of select="text()"/>
+        </line>
+      </xsl:if>
       <xsl:apply-templates mode="extract_i18n" select="svg:*"/>
     </msg>
   </xsl:template>
@@ -1485,7 +1490,19 @@
 </xsl:text>
     <xsl:text>        this.pending = indexes.map(() =&gt; undefined);
 </xsl:text>
-    <xsl:text>        this.bound_unhinibit = this.unhinibit.bind(this);
+    <xsl:text>        this.bound_uninhibit = this.uninhibit.bind(this);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.lastdispatch = indexes.map(() =&gt; undefined);
+</xsl:text>
+    <xsl:text>        this.deafen = indexes.map(() =&gt; undefined);
+</xsl:text>
+    <xsl:text>        this.incoming = indexes.map(() =&gt; undefined);
+</xsl:text>
+    <xsl:text>        this.bound_undeafen = this.undeafen.bind(this);
+</xsl:text>
+    <xsl:text>
 </xsl:text>
     <xsl:text>        this.forced_frequency = freq;
 </xsl:text>
@@ -1573,10 +1590,22 @@
 </xsl:text>
     <xsl:text>                    this.lastapply[i] = undefined;
 </xsl:text>
-    <xsl:text>                    this.unhinibit(i);
+    <xsl:text>                    this.uninhibit(i);
 </xsl:text>
     <xsl:text>                }
 </xsl:text>
+    <xsl:text>                let deafened = this.deafen[i];
+</xsl:text>
+    <xsl:text>                if(deafened != undefined){
+</xsl:text>
+    <xsl:text>                    clearTimeout(deafened);
+</xsl:text>
+    <xsl:text>                    this.lastdispatch[i] = undefined;
+</xsl:text>
+    <xsl:text>                    this.undeafen(i);
+</xsl:text>
+    <xsl:text>                }
+</xsl:text>
     <xsl:text>                let index = this.indexes[i];
 </xsl:text>
     <xsl:text>                if(this.relativeness[i])
@@ -1749,7 +1778,7 @@
 </xsl:text>
     <xsl:text>
 </xsl:text>
-    <xsl:text>    unhinibit(index){
+    <xsl:text>    uninhibit(index){
 </xsl:text>
     <xsl:text>        this.inhibit[index] = undefined;
 </xsl:text>
@@ -1787,7 +1816,7 @@
 </xsl:text>
     <xsl:text>                this.pending[index] = new_val;
 </xsl:text>
-    <xsl:text>                this.inhibit[index] = setTimeout(this.bound_unhinibit, min_interval - elapsed, index);
+    <xsl:text>                this.inhibit[index] = setTimeout(this.bound_uninhibit, min_interval - elapsed, index);
 </xsl:text>
     <xsl:text>            }
 </xsl:text>
@@ -1831,19 +1860,65 @@
 </xsl:text>
     <xsl:text>    
 </xsl:text>
+    <xsl:text>    undeafen(index){
+</xsl:text>
+    <xsl:text>        this.deafen[index] = undefined;
+</xsl:text>
+    <xsl:text>        let [new_val, old_val] = this.incoming[index];
+</xsl:text>
+    <xsl:text>        this.incoming[index] = undefined;
+</xsl:text>
+    <xsl:text>        this.dispatch(new_val, old_val, index);
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
     <xsl:text>    _dispatch(value, oldval, varnum) {
 </xsl:text>
     <xsl:text>        let dispatch = this.dispatch;
 </xsl:text>
     <xsl:text>        if(dispatch != undefined){
 </xsl:text>
-    <xsl:text>            try {
-</xsl:text>
-    <xsl:text>                dispatch.call(this, value, oldval, varnum);
-</xsl:text>
-    <xsl:text>            } catch(err) {
-</xsl:text>
-    <xsl:text>                console.log(err);
+    <xsl:text>            if(this.deafen[varnum] == undefined){
+</xsl:text>
+    <xsl:text>                let now = Date.now();
+</xsl:text>
+    <xsl:text>                let min_interval = 1000/this.frequency;
+</xsl:text>
+    <xsl:text>                let lastdispatch = this.lastdispatch[varnum];
+</xsl:text>
+    <xsl:text>                if(lastdispatch == undefined || now &gt; lastdispatch + min_interval){
+</xsl:text>
+    <xsl:text>                    this.lastdispatch[varnum] = now;
+</xsl:text>
+    <xsl:text>                    try {
+</xsl:text>
+    <xsl:text>                        dispatch.call(this, value, oldval, varnum);
+</xsl:text>
+    <xsl:text>                    } catch(err) {
+</xsl:text>
+    <xsl:text>                        console.log(err);
+</xsl:text>
+    <xsl:text>                    }
+</xsl:text>
+    <xsl:text>                }
+</xsl:text>
+    <xsl:text>                else {
+</xsl:text>
+    <xsl:text>                    let elapsed = now - lastdispatch;
+</xsl:text>
+    <xsl:text>                    this.incoming[varnum] = [value, oldval];
+</xsl:text>
+    <xsl:text>                    this.deafen[varnum] = setTimeout(this.bound_undeafen, min_interval - elapsed, varnum);
+</xsl:text>
+    <xsl:text>                }
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>            else {
+</xsl:text>
+    <xsl:text>                this.incoming[varnum] = [value, oldval];
 </xsl:text>
     <xsl:text>            }
 </xsl:text>
@@ -4211,7 +4286,7 @@
         <xsl:value-of select="$text_elt/@id"/>
         <xsl:text>");
 </xsl:text>
-        <xsl:text>  this.content = langs;
+        <xsl:text>  this.content = langs.map(([lname,lcode]) =&gt; lname);
 </xsl:text>
       </xsl:when>
       <xsl:when test="count(arg) = 0">
@@ -7750,6 +7825,1313 @@
       <xsl:with-param name="mandatory" select="'no'"/>
     </xsl:call-template>
   </xsl:template>
+  <xsl:template match="widget[@type='XYGraph']" mode="widget_desc">
+    <type>
+      <xsl:value-of select="@type"/>
+    </type>
+    <longdesc>
+      <xsl:text>XYGraph draws a cartesian trend graph re-using styles given for axis,
+</xsl:text>
+      <xsl:text>grid/marks, legends and curves.
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Elements labeled "x_axis" and "y_axis" are svg:groups containg:
+</xsl:text>
+      <xsl:text> - "axis_label" svg:text gives style an alignment for axis labels.
+</xsl:text>
+      <xsl:text> - "interval_major_mark" and "interval_minor_mark" are svg elements to be
+</xsl:text>
+      <xsl:text>   duplicated along axis line to form intervals marks.
+</xsl:text>
+      <xsl:text> - "axis_line"  svg:path is the axis line. Paths must be intersect and their
+</xsl:text>
+      <xsl:text>   bounding box is the chart wall.
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Elements labeled "curve_0", "curve_1", ... are paths whose styles are used
+</xsl:text>
+      <xsl:text>to draw curves corresponding to data from variables passed as HMI tree paths.
+</xsl:text>
+      <xsl:text>"curve_0" is mandatory. HMI variables outnumbering given curves are ignored.
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+    </longdesc>
+    <shortdesc>
+      <xsl:text>Cartesian trend graph showing values of given variables over time</xsl:text>
+    </shortdesc>
+    <path name="value" count="1+" accepts="HMI_INT,HMI_REAL">
+      <xsl:text>value</xsl:text>
+    </path>
+    <arg name="xrange" accepts="int,time">
+      <xsl:text>X axis range expressed either in samples or duration.</xsl:text>
+    </arg>
+    <arg name="xformat" count="optional" accepts="string">
+      <xsl:text>format string for X label</xsl:text>
+    </arg>
+    <arg name="yformat" count="optional" accepts="string">
+      <xsl:text>format string for Y label</xsl:text>
+    </arg>
+  </xsl:template>
+  <xsl:template match="widget[@type='XYGraph']" mode="widget_class">
+    <xsl:text>class </xsl:text>
+    <xsl:text>XYGraphWidget</xsl:text>
+    <xsl:text> extends Widget{
+</xsl:text>
+    <xsl:text>    frequency = 1;
+</xsl:text>
+    <xsl:text>    init() {
+</xsl:text>
+    <xsl:text>        let x_duration_s;
+</xsl:text>
+    <xsl:text>        [x_duration_s,
+</xsl:text>
+    <xsl:text>         this.x_format, this.y_format] = this.args;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let timeunit = x_duration_s.slice(-1);
+</xsl:text>
+    <xsl:text>        let factor = {
+</xsl:text>
+    <xsl:text>            "s":1,
+</xsl:text>
+    <xsl:text>            "m":60,
+</xsl:text>
+    <xsl:text>            "h":3600,
+</xsl:text>
+    <xsl:text>            "d":86400}[timeunit];
+</xsl:text>
+    <xsl:text>        if(factor == undefined){
+</xsl:text>
+    <xsl:text>            this.max_data_length = Number(x_duration_s);
+</xsl:text>
+    <xsl:text>            this.x_duration = undefined;
+</xsl:text>
+    <xsl:text>        }else{
+</xsl:text>
+    <xsl:text>            let duration = factor*Number(x_duration_s.slice(0,-1));
+</xsl:text>
+    <xsl:text>            this.max_data_length = undefined;
+</xsl:text>
+    <xsl:text>            this.x_duration = duration*1000;
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // Min and Max given with paths are meant to describe visible range,
+</xsl:text>
+    <xsl:text>        // not to clip data.
+</xsl:text>
+    <xsl:text>        this.clip = false;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let y_min = Infinity, y_max = -Infinity;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // Compute visible Y range by merging fixed curves Y ranges
+</xsl:text>
+    <xsl:text>        for(let minmax of this.minmaxes){
+</xsl:text>
+    <xsl:text>           if(minmax){
+</xsl:text>
+    <xsl:text>               let [min,max] = minmax;
+</xsl:text>
+    <xsl:text>               if(min &lt; y_min)
+</xsl:text>
+    <xsl:text>                   y_min = min;
+</xsl:text>
+    <xsl:text>               if(max &gt; y_max)
+</xsl:text>
+    <xsl:text>                   y_max = max;
+</xsl:text>
+    <xsl:text>           }
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        if(y_min !== Infinity &amp;&amp; y_max !== -Infinity){
+</xsl:text>
+    <xsl:text>           this.fixed_y_range = true;
+</xsl:text>
+    <xsl:text>        } else {
+</xsl:text>
+    <xsl:text>           this.fixed_y_range = false;
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.ymin = y_min;
+</xsl:text>
+    <xsl:text>        this.ymax = y_max;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.curves = [];
+</xsl:text>
+    <xsl:text>        this.init_specific();
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.reference = new ReferenceFrame(
+</xsl:text>
+    <xsl:text>            [[this.x_interval_minor_mark_elt, this.x_interval_major_mark_elt],
+</xsl:text>
+    <xsl:text>             [this.y_interval_minor_mark_elt, this.y_interval_major_mark_elt]],
+</xsl:text>
+    <xsl:text>            [this.x_axis_label_elt, this.y_axis_label_elt],
+</xsl:text>
+    <xsl:text>            [this.x_axis_line_elt, this.y_axis_line_elt],
+</xsl:text>
+    <xsl:text>            [this.x_format, this.y_format]);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let max_stroke_width = 0;
+</xsl:text>
+    <xsl:text>        for(let curve of this.curves){
+</xsl:text>
+    <xsl:text>            if(curve.style.strokeWidth &gt; max_stroke_width){
+</xsl:text>
+    <xsl:text>                max_stroke_width = curve.style.strokeWidth;
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.Margins=this.reference.getLengths().map(length =&gt; max_stroke_width/length);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // create &lt;clipPath&gt; path and attach it to widget
+</xsl:text>
+    <xsl:text>        let clipPath = document.createElementNS(xmlns,"clipPath");
+</xsl:text>
+    <xsl:text>        let clipPathPath = document.createElementNS(xmlns,"path");
+</xsl:text>
+    <xsl:text>        let clipPathPathDattr = document.createAttribute("d");
+</xsl:text>
+    <xsl:text>        clipPathPathDattr.value = this.reference.getClipPathPathDattr();
+</xsl:text>
+    <xsl:text>        clipPathPath.setAttributeNode(clipPathPathDattr);
+</xsl:text>
+    <xsl:text>        clipPath.appendChild(clipPathPath);
+</xsl:text>
+    <xsl:text>        clipPath.id = randomId();
+</xsl:text>
+    <xsl:text>        this.element.appendChild(clipPath);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // assign created clipPath to clip-path property of curves
+</xsl:text>
+    <xsl:text>        for(let curve of this.curves){
+</xsl:text>
+    <xsl:text>            curve.setAttribute("clip-path", "url(#" + clipPath.id + ")");
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.curves_data = this.curves.map(_unused =&gt; []);
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    dispatch(value,oldval, index) {
+</xsl:text>
+    <xsl:text>        // TODO: get PLC time instead of browser time
+</xsl:text>
+    <xsl:text>        let time = Date.now();
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // naive local buffer impl. 
+</xsl:text>
+    <xsl:text>        // data is updated only when graph is visible
+</xsl:text>
+    <xsl:text>        // TODO: replace with separate recording
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.curves_data[index].push([time, value]);
+</xsl:text>
+    <xsl:text>        let data_length = this.curves_data[index].length;
+</xsl:text>
+    <xsl:text>        let ymin_damaged = false;
+</xsl:text>
+    <xsl:text>        let ymax_damaged = false;
+</xsl:text>
+    <xsl:text>        let overflow;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        if(this.max_data_length == undefined){
+</xsl:text>
+    <xsl:text>            let peremption = time - this.x_duration;
+</xsl:text>
+    <xsl:text>            let oldest = this.curves_data[index][0][0]
+</xsl:text>
+    <xsl:text>            this.xmin = peremption;
+</xsl:text>
+    <xsl:text>            if(oldest &lt; peremption){
+</xsl:text>
+    <xsl:text>                // remove first item
+</xsl:text>
+    <xsl:text>                overflow = this.curves_data[index].shift()[1];
+</xsl:text>
+    <xsl:text>                data_length = data_length - 1;
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>        } else {
+</xsl:text>
+    <xsl:text>            if(data_length &gt; this.max_data_length){
+</xsl:text>
+    <xsl:text>                // remove first item
+</xsl:text>
+    <xsl:text>                [this.xmin, overflow] = this.curves_data[index].shift();
+</xsl:text>
+    <xsl:text>                data_length = data_length - 1;
+</xsl:text>
+    <xsl:text>            } else {
+</xsl:text>
+    <xsl:text>                if(this.xmin == undefined){
+</xsl:text>
+    <xsl:text>                    this.xmin = time;
+</xsl:text>
+    <xsl:text>                }
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.xmax = time;
+</xsl:text>
+    <xsl:text>        let Xrange = this.xmax - this.xmin;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        if(!this.fixed_y_range){
+</xsl:text>
+    <xsl:text>            ymin_damaged = overflow &lt;= this.ymin;
+</xsl:text>
+    <xsl:text>            ymax_damaged = overflow &gt;= this.ymax;
+</xsl:text>
+    <xsl:text>            if(value &gt; this.ymax){
+</xsl:text>
+    <xsl:text>                ymax_damaged = false;
+</xsl:text>
+    <xsl:text>                this.ymax = value;
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>            if(value &lt; this.ymin){
+</xsl:text>
+    <xsl:text>                ymin_damaged = false;
+</xsl:text>
+    <xsl:text>                this.ymin = value;
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>        let Yrange = this.ymax - this.ymin;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // apply margin by moving min and max to enlarge range
+</xsl:text>
+    <xsl:text>        let [xMargin,yMargin] = zip(this.Margins, [Xrange, Yrange]).map(([m,l]) =&gt; m*l);
+</xsl:text>
+    <xsl:text>        [[this.dxmin, this.dxmax],[this.dymin,this.dymax]] =
+</xsl:text>
+    <xsl:text>            [[this.xmin-xMargin, this.xmax+xMargin],
+</xsl:text>
+    <xsl:text>             [this.ymin-yMargin, this.ymax+yMargin]];
+</xsl:text>
+    <xsl:text>        Xrange += 2*xMargin;
+</xsl:text>
+    <xsl:text>        Yrange += 2*yMargin;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // recompute curves "d" attribute
+</xsl:text>
+    <xsl:text>        // FIXME: use SVG getPathData and setPathData when available.
+</xsl:text>
+    <xsl:text>        //        https://svgwg.org/specs/paths/#InterfaceSVGPathData
+</xsl:text>
+    <xsl:text>        //        https://github.com/jarek-foksa/path-data-polyfill
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let [base_point, xvect, yvect] = this.reference.getBaseRef();
+</xsl:text>
+    <xsl:text>        this.curves_d_attr =
+</xsl:text>
+    <xsl:text>            zip(this.curves_data, this.curves).map(([data,curve]) =&gt; {
+</xsl:text>
+    <xsl:text>                let new_d = data.map(([x,y], i) =&gt; {
+</xsl:text>
+    <xsl:text>                    // compute curve point from data, ranges, and base_ref
+</xsl:text>
+    <xsl:text>                    let xv = vectorscale(xvect, (x - this.dxmin) / Xrange);
+</xsl:text>
+    <xsl:text>                    let yv = vectorscale(yvect, (y - this.dymin) / Yrange);
+</xsl:text>
+    <xsl:text>                    let px = base_point.x + xv.x + yv.x;
+</xsl:text>
+    <xsl:text>                    let py = base_point.y + xv.y + yv.y;
+</xsl:text>
+    <xsl:text>                    if(!this.fixed_y_range){
+</xsl:text>
+    <xsl:text>                        // update min and max from curve data if needed
+</xsl:text>
+    <xsl:text>                        if(ymin_damaged &amp;&amp; y &lt; this.ymin) this.ymin = y;
+</xsl:text>
+    <xsl:text>                        if(ymax_damaged &amp;&amp; y &gt; this.ymax) this.ymax = y;
+</xsl:text>
+    <xsl:text>                    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                    return " " + px + "," + py;
+</xsl:text>
+    <xsl:text>                });
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                new_d.unshift("M ");
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                return new_d.join('');
+</xsl:text>
+    <xsl:text>            });
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // computed curves "d" attr is applied to svg curve during animate();
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.request_animate();
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    animate(){
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // move elements only if enough data
+</xsl:text>
+    <xsl:text>        if(this.curves_data.some(data =&gt; data.length &gt; 1)){
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>            // move marks and update labels
+</xsl:text>
+    <xsl:text>            this.reference.applyRanges([[this.dxmin, this.dxmax],
+</xsl:text>
+    <xsl:text>                                        [this.dymin, this.dymax]]);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>            // apply computed curves "d" attributes
+</xsl:text>
+    <xsl:text>            for(let [curve, d_attr] of zip(this.curves, this.curves_d_attr)){
+</xsl:text>
+    <xsl:text>                curve.setAttribute("d", d_attr);
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>}
+</xsl:text>
+  </xsl:template>
+  <xsl:template match="widget[@type='XYGraph']" mode="widget_defs">
+    <xsl:param name="hmi_element"/>
+    <xsl:call-template name="defs_by_labels">
+      <xsl:with-param name="hmi_element" select="$hmi_element"/>
+      <xsl:with-param name="labels">
+        <xsl:text>/x_interval_minor_mark /x_axis_line /x_interval_major_mark /x_axis_label</xsl:text>
+      </xsl:with-param>
+    </xsl:call-template>
+    <xsl:call-template name="defs_by_labels">
+      <xsl:with-param name="hmi_element" select="$hmi_element"/>
+      <xsl:with-param name="labels">
+        <xsl:text>/y_interval_minor_mark /y_axis_line /y_interval_major_mark /y_axis_label</xsl:text>
+      </xsl:with-param>
+    </xsl:call-template>
+    <xsl:text>    init_specific() {
+</xsl:text>
+    <xsl:for-each select="$hmi_element/*[regexp:test(@inkscape:label,'^curve_[0-9]+$')]">
+      <xsl:variable name="label" select="@inkscape:label"/>
+      <xsl:variable name="id" select="@id"/>
+      <xsl:if test="$hmi_element/*[not($id = @id) and @inkscape:label=$label]">
+        <xsl:message terminate="yes">
+          <xsl:text>XYGraph id="</xsl:text>
+          <xsl:value-of select="$id"/>
+          <xsl:text>", label="</xsl:text>
+          <xsl:value-of select="$label"/>
+          <xsl:text>" : elements with data_n label must be unique.</xsl:text>
+        </xsl:message>
+      </xsl:if>
+      <xsl:text>        this.curves[</xsl:text>
+      <xsl:value-of select="substring(@inkscape:label, 7)"/>
+      <xsl:text>] = id("</xsl:text>
+      <xsl:value-of select="@id"/>
+      <xsl:text>"); /* </xsl:text>
+      <xsl:value-of select="@inkscape:label"/>
+      <xsl:text> */
+</xsl:text>
+    </xsl:for-each>
+    <xsl:text>    }
+</xsl:text>
+  </xsl:template>
+  <declarations:XYGraph/>
+  <xsl:template match="declarations:XYGraph">
+    <xsl:text>
+</xsl:text>
+    <xsl:text>/* </xsl:text>
+    <xsl:value-of select="local-name()"/>
+    <xsl:text> */
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>function lineFromPath(path_elt) {
+</xsl:text>
+    <xsl:text>    let start = path_elt.getPointAtLength(0);
+</xsl:text>
+    <xsl:text>    let end = path_elt.getPointAtLength(path_elt.getTotalLength());
+</xsl:text>
+    <xsl:text>    return [start, new DOMPoint(end.x - start.x , end.y - start.y)];
+</xsl:text>
+    <xsl:text>};
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>function vector(p1, p2) {
+</xsl:text>
+    <xsl:text>    return new DOMPoint(p2.x - p1.x , p2.y - p1.y);
+</xsl:text>
+    <xsl:text>};
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>function vectorscale(p1, p2) {
+</xsl:text>
+    <xsl:text>    return new DOMPoint(p2 * p1.x , p2 * p1.y);
+</xsl:text>
+    <xsl:text>};
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>function vectorLength(p1) {
+</xsl:text>
+    <xsl:text>    return Math.sqrt(p1.x*p1.x + p1.y*p1.y);
+</xsl:text>
+    <xsl:text>};
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>function randomId(){
+</xsl:text>
+    <xsl:text>    return Date.now().toString(36) + Math.random().toString(36).substr(2);
+</xsl:text>
+    <xsl:text>}
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>function move_elements_to_group(elements) {
+</xsl:text>
+    <xsl:text>    let newgroup = document.createElementNS(xmlns,"g");
+</xsl:text>
+    <xsl:text>    newgroup.id = randomId();
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    for(let element of elements){
+</xsl:text>
+    <xsl:text>        let parent = element.parentElement;
+</xsl:text>
+    <xsl:text>        if(parent !== null)
+</xsl:text>
+    <xsl:text>            parent.removeChild(element);
+</xsl:text>
+    <xsl:text>        newgroup.appendChild(element);
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>    return newgroup;
+</xsl:text>
+    <xsl:text>}
+</xsl:text>
+    <xsl:text>function getLinesIntesection(l1, l2) {
+</xsl:text>
+    <xsl:text>    let [l1start, l1vect] = l1;
+</xsl:text>
+    <xsl:text>    let [l2start, l2vect] = l2;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    /*
+</xsl:text>
+    <xsl:text>    Compute intersection of two lines
+</xsl:text>
+    <xsl:text>    =================================
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                          ^ l2vect
+</xsl:text>
+    <xsl:text>                         /
+</xsl:text>
+    <xsl:text>                        /
+</xsl:text>
+    <xsl:text>                       /
+</xsl:text>
+    <xsl:text>    l1start ----------X--------------&gt; l1vect
+</xsl:text>
+    <xsl:text>                     / intersection
+</xsl:text>
+    <xsl:text>                    /
+</xsl:text>
+    <xsl:text>                   /
+</xsl:text>
+    <xsl:text>                   l2start
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>	*/
+</xsl:text>
+    <xsl:text>    let [x1, y1, x3, y3] = [l1start.x, l1start.y, l2start.x, l2start.y];
+</xsl:text>
+    <xsl:text>	let [x2, y2, x4, y4] = [x1+l1vect.x, y1+l1vect.y, x3+l2vect.x, y3+l2vect.y];
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>	// line intercept math by Paul Bourke http://paulbourke.net/geometry/pointlineplane/
+</xsl:text>
+    <xsl:text>	// Determine the intersection point of two line segments
+</xsl:text>
+    <xsl:text>	// Return FALSE if the lines don't intersect
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    // Check if none of the lines are of length 0
+</xsl:text>
+    <xsl:text>    if ((x1 === x2 &amp;&amp; y1 === y2) || (x3 === x4 &amp;&amp; y3 === y4)) {
+</xsl:text>
+    <xsl:text>        return false
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    denominator = ((y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1))
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    // Lines are parallel
+</xsl:text>
+    <xsl:text>    if (denominator === 0) {
+</xsl:text>
+    <xsl:text>        return false
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    let ua = ((x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)) / denominator
+</xsl:text>
+    <xsl:text>    let ub = ((x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)) / denominator
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    // Return a object with the x and y coordinates of the intersection
+</xsl:text>
+    <xsl:text>    let x = x1 + ua * (x2 - x1)
+</xsl:text>
+    <xsl:text>    let y = y1 + ua * (y2 - y1)
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    return new DOMPoint(x,y);
+</xsl:text>
+    <xsl:text>};
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>class ReferenceFrame {
+</xsl:text>
+    <xsl:text>    constructor(
+</xsl:text>
+    <xsl:text>        // [[Xminor,Xmajor], [Yminor,Ymajor]]
+</xsl:text>
+    <xsl:text>        marks,
+</xsl:text>
+    <xsl:text>        // [Xlabel, Ylabel]
+</xsl:text>
+    <xsl:text>        labels,
+</xsl:text>
+    <xsl:text>        // [Xline, Yline]
+</xsl:text>
+    <xsl:text>        lines,
+</xsl:text>
+    <xsl:text>        // [Xformat, Yformat] printf-like formating strings
+</xsl:text>
+    <xsl:text>        formats
+</xsl:text>
+    <xsl:text>    ){
+</xsl:text>
+    <xsl:text>        this.axes = zip(labels,marks,lines,formats).map(args =&gt; new Axis(...args));
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let [lx,ly] = this.axes.map(axis =&gt; axis.line);
+</xsl:text>
+    <xsl:text>        let [[xstart, xvect], [ystart, yvect]] = [lx,ly];
+</xsl:text>
+    <xsl:text>        let base_point = this.getBasePoint();
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // setup clipping for curves
+</xsl:text>
+    <xsl:text>        this.clipPathPathDattr =
+</xsl:text>
+    <xsl:text>            "m " + base_point.x + "," + base_point.y + " "
+</xsl:text>
+    <xsl:text>                 + xvect.x + "," + xvect.y + " "
+</xsl:text>
+    <xsl:text>                 + yvect.x + "," + yvect.y + " "
+</xsl:text>
+    <xsl:text>                 + -xvect.x + "," + -xvect.y + " "
+</xsl:text>
+    <xsl:text>                 + -yvect.x + "," + -yvect.y + " z";
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.base_ref = [base_point, xvect, yvect];
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.lengths = [xvect,yvect].map(v =&gt; vectorLength(v));
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        for(let axis of this.axes){
+</xsl:text>
+    <xsl:text>            axis.setBasePoint(base_point);
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    getLengths(){
+</xsl:text>
+    <xsl:text>        return this.lengths;
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>	getBaseRef(){
+</xsl:text>
+    <xsl:text>        return this.base_ref;
+</xsl:text>
+    <xsl:text>	}
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    getClipPathPathDattr(){
+</xsl:text>
+    <xsl:text>        return this.clipPathPathDattr;
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    applyRanges(ranges){
+</xsl:text>
+    <xsl:text>        let origin_moves = zip(ranges,this.axes).map(([range,axis]) =&gt; axis.applyRange(...range));
+</xsl:text>
+    <xsl:text>		zip(origin_moves.reverse(),this.axes).forEach(([vect,axis]) =&gt; axis.moveOrigin(vect));
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    getBasePoint() {
+</xsl:text>
+    <xsl:text>        let [[xstart, xvect], [ystart, yvect]] = this.axes.map(axis =&gt; axis.line);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        /*
+</xsl:text>
+    <xsl:text>        Compute graph clipping region base point
+</xsl:text>
+    <xsl:text>        ========================================
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        Clipping region is a parallelogram containing axes lines,
+</xsl:text>
+    <xsl:text>        and whose sides are parallel to axes line respectively.
+</xsl:text>
+    <xsl:text>        Given axes lines are not starting at the same point, hereafter is
+</xsl:text>
+    <xsl:text>        calculus of parallelogram base point.
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                              ^ given Y axis (yvect)
+</xsl:text>
+    <xsl:text>                   /         /
+</xsl:text>
+    <xsl:text>                  /         /
+</xsl:text>
+    <xsl:text>                 /         /
+</xsl:text>
+    <xsl:text>         xstart *---------*--------------&gt; given X axis (xvect)
+</xsl:text>
+    <xsl:text>               /         /origin
+</xsl:text>
+    <xsl:text>              /         /
+</xsl:text>
+    <xsl:text>             *---------*--------------
+</xsl:text>
+    <xsl:text>        base_point   ystart
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        */
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let base_point = getLinesIntesection([xstart,yvect],[ystart,xvect]);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        return base_point;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>}
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>class Axis {
+</xsl:text>
+    <xsl:text>    constructor(label, marks, line, format){
+</xsl:text>
+    <xsl:text>        this.lineElement = line;
+</xsl:text>
+    <xsl:text>        this.line = lineFromPath(line);
+</xsl:text>
+    <xsl:text>        this.format = format;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.label = label;
+</xsl:text>
+    <xsl:text>        this.marks = marks;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // add transforms for elements sliding along the axis line
+</xsl:text>
+    <xsl:text>        for(let [elementname,element] of zip(["minor", "major", "label"],[...marks,label])){
+</xsl:text>
+    <xsl:text>            for(let name of ["base","slide"]){
+</xsl:text>
+    <xsl:text>                let transform = svg_root.createSVGTransform();
+</xsl:text>
+    <xsl:text>                element.transform.baseVal.insertItemBefore(transform,0);
+</xsl:text>
+    <xsl:text>                this[elementname+"_"+name+"_transform"]=transform;
+</xsl:text>
+    <xsl:text>            };
+</xsl:text>
+    <xsl:text>        };
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // group marks an labels together
+</xsl:text>
+    <xsl:text>        let parent = line.parentElement;
+</xsl:text>
+    <xsl:text>        this.marks_group = move_elements_to_group(marks);
+</xsl:text>
+    <xsl:text>        this.marks_and_label_group = move_elements_to_group([this.marks_group, label]);
+</xsl:text>
+    <xsl:text>        this.group = move_elements_to_group([this.marks_and_label_group,line]);
+</xsl:text>
+    <xsl:text>        parent.appendChild(this.group);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // Add transforms to group
+</xsl:text>
+    <xsl:text>        for(let name of ["base","origin"]){
+</xsl:text>
+    <xsl:text>            let transform = svg_root.createSVGTransform();
+</xsl:text>
+    <xsl:text>            this.group.transform.baseVal.appendItem(transform);
+</xsl:text>
+    <xsl:text>            this[name+"_transform"]=transform;
+</xsl:text>
+    <xsl:text>        };
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.marks_and_label_group_transform = svg_root.createSVGTransform();
+</xsl:text>
+    <xsl:text>        this.marks_and_label_group.transform.baseVal.appendItem(this.marks_and_label_group_transform);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.duplicates = [];
+</xsl:text>
+    <xsl:text>        this.last_duplicate_index = 0;
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    setBasePoint(base_point){
+</xsl:text>
+    <xsl:text>        // move Axis to base point
+</xsl:text>
+    <xsl:text>        let [start, _vect] = this.line;
+</xsl:text>
+    <xsl:text>        let v = vector(start, base_point);
+</xsl:text>
+    <xsl:text>        this.base_transform.setTranslate(v.x, v.y);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // Move marks and label to base point.
+</xsl:text>
+    <xsl:text>        // _|_______          _|________
+</xsl:text>
+    <xsl:text>        //  |  '  |     ==&gt;    '
+</xsl:text>
+    <xsl:text>        //  |     0            0
+</xsl:text>
+    <xsl:text>        //  |                  |
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        for(let [markname,mark] of zip(["minor", "major"],this.marks)){
+</xsl:text>
+    <xsl:text>            let pos = vector(
+</xsl:text>
+    <xsl:text>                // Marks are expected to be paths
+</xsl:text>
+    <xsl:text>                // paths are expected to be lines
+</xsl:text>
+    <xsl:text>                // intersection with axis line is taken 
+</xsl:text>
+    <xsl:text>                // as reference for mark position
+</xsl:text>
+    <xsl:text>                getLinesIntesection(
+</xsl:text>
+    <xsl:text>                    this.line, lineFromPath(mark)),base_point);
+</xsl:text>
+    <xsl:text>            this[markname+"_base_transform"].setTranslate(pos.x - v.x, pos.y - v.y);
+</xsl:text>
+    <xsl:text>            if(markname == "major"){ // label follow major mark
+</xsl:text>
+    <xsl:text>                this.label_base_transform.setTranslate(pos.x - v.x, pos.y - v.y);
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>	moveOrigin(vect){
+</xsl:text>
+    <xsl:text>		this.origin_transform.setTranslate(vect.x, vect.y);
+</xsl:text>
+    <xsl:text>	}
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>    applyRange(min, max){
+</xsl:text>
+    <xsl:text>        let range = max - min;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // compute how many units for a mark
+</xsl:text>
+    <xsl:text>        //
+</xsl:text>
+    <xsl:text>        // - Units are expected to be an order of magnitude smaller than range,
+</xsl:text>
+    <xsl:text>        //   so that marks are not too dense and also not too sparse.
+</xsl:text>
+    <xsl:text>        //   Order of magnitude of range is log10(range)
+</xsl:text>
+    <xsl:text>        //
+</xsl:text>
+    <xsl:text>        // - Units are necessarily power of ten, otherwise it is complicated to
+</xsl:text>
+    <xsl:text>        //   fill the text in labels...
+</xsl:text>
+    <xsl:text>        //   Unit is pow(10, integer_number )
+</xsl:text>
+    <xsl:text>        //
+</xsl:text>
+    <xsl:text>        // - To transform order of magnitude to an integer, floor() is used.
+</xsl:text>
+    <xsl:text>        //   This results in a count of mark fluctuating in between 10 and 100.
+</xsl:text>
+    <xsl:text>        //
+</xsl:text>
+    <xsl:text>        // - To spare resources result is better in between 3 and 30,
+</xsl:text>
+    <xsl:text>        //   and log10(3) is substracted to order of magnitude to obtain this
+</xsl:text>
+    <xsl:text>        let unit = Math.pow(10, Math.floor(Math.log10(range)-Math.log10(3)));
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // TODO: for time values (ms), units may be :
+</xsl:text>
+    <xsl:text>        //       1       -&gt; ms
+</xsl:text>
+    <xsl:text>        //       10      -&gt; s/100
+</xsl:text>
+    <xsl:text>        //       100     -&gt; s/10
+</xsl:text>
+    <xsl:text>        //       1000    -&gt; s
+</xsl:text>
+    <xsl:text>        //       60000   -&gt; min
+</xsl:text>
+    <xsl:text>        //       3600000 -&gt; hour
+</xsl:text>
+    <xsl:text>        //       ...
+</xsl:text>
+    <xsl:text>        //
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // Compute position of origin along axis [0...range]
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // min &lt; 0, max &gt; 0, offset = -min
+</xsl:text>
+    <xsl:text>        // _____________|________________
+</xsl:text>
+    <xsl:text>        // ... -3 -2 -1 |0  1  2  3  4 ...
+</xsl:text>
+    <xsl:text>        // &lt;--offset---&gt; ^
+</xsl:text>
+    <xsl:text>        //               |_original
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // min &gt; 0, max &gt; 0, offset = 0
+</xsl:text>
+    <xsl:text>        // |________________
+</xsl:text>
+    <xsl:text>        // |6  7  8  9  10...
+</xsl:text>
+    <xsl:text>        //  ^
+</xsl:text>
+    <xsl:text>        //  |_original
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // min &lt; 0, max &lt; 0, offset = max-min (range)
+</xsl:text>
+    <xsl:text>        // _____________|_
+</xsl:text>
+    <xsl:text>        // ... -5 -4 -3 |-2
+</xsl:text>
+    <xsl:text>        // &lt;--offset---&gt; ^
+</xsl:text>
+    <xsl:text>        //               |_original
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let offset = (max&gt;=0 &amp;&amp; min&gt;=0) ? 0 : (
+</xsl:text>
+    <xsl:text>                     (max&lt;0 &amp;&amp; min&lt;0)   ? range : -min);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // compute unit vector
+</xsl:text>
+    <xsl:text>        let [_start, vect] = this.line;
+</xsl:text>
+    <xsl:text>        let unit_vect = vectorscale(vect, 1/range);
+</xsl:text>
+    <xsl:text>        let [mark_min, mark_max, mark_offset] = [min,max,offset].map(val =&gt; Math.round(val/unit));
+</xsl:text>
+    <xsl:text>        let mark_count = mark_max-mark_min;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // apply unit vector to marks and label
+</xsl:text>
+    <xsl:text>        // offset is a representing position of an 
+</xsl:text>
+    <xsl:text>        // axis along the opposit axis line, expressed in major marks units
+</xsl:text>
+    <xsl:text>        // unit_vect is unit vector
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        //              ^
+</xsl:text>
+    <xsl:text>        //              | unit_vect
+</xsl:text>
+    <xsl:text>        //              |&lt;---&gt;
+</xsl:text>
+    <xsl:text>        //     _________|__________&gt;
+</xsl:text>
+    <xsl:text>        //     ^  |  '  |  '  |  '
+</xsl:text>
+    <xsl:text>        //     |yoffset |     1 
+</xsl:text>
+    <xsl:text>        //     |        |
+</xsl:text>
+    <xsl:text>        //     v xoffset|
+</xsl:text>
+    <xsl:text>        //     X&lt;------&gt;|
+</xsl:text>
+    <xsl:text>        // base_point
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // move major marks and label to first positive mark position
+</xsl:text>
+    <xsl:text>        // let v = vectorscale(unit_vect, unit);
+</xsl:text>
+    <xsl:text>        // this.label_slide_transform.setTranslate(v.x, v.y);
+</xsl:text>
+    <xsl:text>        // this.major_slide_transform.setTranslate(v.x, v.y);
+</xsl:text>
+    <xsl:text>        // move minor mark to first half positive mark position
+</xsl:text>
+    <xsl:text>        let v = vectorscale(unit_vect, unit/2);
+</xsl:text>
+    <xsl:text>        this.minor_slide_transform.setTranslate(v.x, v.y);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // duplicate marks and labels as needed
+</xsl:text>
+    <xsl:text>        let current_mark_count = this.duplicates.length;
+</xsl:text>
+    <xsl:text>        for(let i = current_mark_count; i &lt;= mark_count; i++){
+</xsl:text>
+    <xsl:text>            // cloneNode() label and add a svg:use of marks in a new group
+</xsl:text>
+    <xsl:text>            let newgroup = document.createElementNS(xmlns,"g");
+</xsl:text>
+    <xsl:text>            let transform = svg_root.createSVGTransform();
+</xsl:text>
+    <xsl:text>            let newlabel = this.label.cloneNode(true);
+</xsl:text>
+    <xsl:text>            let newuse = document.createElementNS(xmlns,"use");
+</xsl:text>
+    <xsl:text>            let newuseAttr = document.createAttribute("href");
+</xsl:text>
+    <xsl:text>            newuseAttr.value = "#"+this.marks_group.id;
+</xsl:text>
+    <xsl:text>            newuse.setAttributeNode(newuseAttr);
+</xsl:text>
+    <xsl:text>            newgroup.transform.baseVal.appendItem(transform);
+</xsl:text>
+    <xsl:text>            newgroup.appendChild(newlabel);
+</xsl:text>
+    <xsl:text>            newgroup.appendChild(newuse);
+</xsl:text>
+    <xsl:text>            this.duplicates.push([transform,newgroup]);
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        // move marks and labels, set labels
+</xsl:text>
+    <xsl:text>        // 
+</xsl:text>
+    <xsl:text>        // min &gt; 0, max &gt; 0, offset = 0
+</xsl:text>
+    <xsl:text>        //         ^
+</xsl:text>
+    <xsl:text>        //         |________&gt;
+</xsl:text>
+    <xsl:text>        //        '| |  '  |
+</xsl:text>
+    <xsl:text>        //         | 6     7
+</xsl:text>
+    <xsl:text>        //         X
+</xsl:text>
+    <xsl:text>        //     base_point
+</xsl:text>
+    <xsl:text>        //
+</xsl:text>
+    <xsl:text>        // min &lt; 0, max &gt; 0, offset = -min
+</xsl:text>
+    <xsl:text>        //              ^
+</xsl:text>
+    <xsl:text>        //     _________|__________&gt;
+</xsl:text>
+    <xsl:text>        //     '  |  '  |  '  |  '
+</xsl:text>
+    <xsl:text>        //       -1     |     1 
+</xsl:text>
+    <xsl:text>        //       offset |
+</xsl:text>
+    <xsl:text>        //     X&lt;------&gt;|
+</xsl:text>
+    <xsl:text>        // base_point
+</xsl:text>
+    <xsl:text>        //
+</xsl:text>
+    <xsl:text>        // min &lt; 0, max &lt; 0, offset = range
+</xsl:text>
+    <xsl:text>        //                 ^
+</xsl:text>
+    <xsl:text>        //     ____________|    
+</xsl:text>
+    <xsl:text>        //      '  |  '  | |'
+</xsl:text>
+    <xsl:text>        //        -5    -4 |
+</xsl:text>
+    <xsl:text>        //         offset  |
+</xsl:text>
+    <xsl:text>        //     X&lt;---------&gt;|
+</xsl:text>
+    <xsl:text>        // base_point
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let duplicate_index = 0;
+</xsl:text>
+    <xsl:text>        for(let mark_index = 0; mark_index &lt;= mark_count; mark_index++){
+</xsl:text>
+    <xsl:text>            let val = (mark_min + mark_index) * unit;
+</xsl:text>
+    <xsl:text>            let vec = vectorscale(unit_vect, val - min);
+</xsl:text>
+    <xsl:text>            let text = this.format ? sprintf(this.format, val) : val.toString();
+</xsl:text>
+    <xsl:text>            if(mark_index == mark_offset){
+</xsl:text>
+    <xsl:text>                // apply offset to original marks and label groups
+</xsl:text>
+    <xsl:text>                this.marks_and_label_group_transform.setTranslate(vec.x, vec.y);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                // update original label text
+</xsl:text>
+    <xsl:text>                this.label.getElementsByTagName("tspan")[0].textContent = text;
+</xsl:text>
+    <xsl:text>            } else {
+</xsl:text>
+    <xsl:text>                let [transform,element] = this.duplicates[duplicate_index++];
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                // apply unit vector*N to marks and label groups
+</xsl:text>
+    <xsl:text>                transform.setTranslate(vec.x, vec.y);
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                // update label text
+</xsl:text>
+    <xsl:text>                element.getElementsByTagName("tspan")[0].textContent = text;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>                // Attach to group if not already
+</xsl:text>
+    <xsl:text>                if(element.parentElement == null){
+</xsl:text>
+    <xsl:text>                    this.group.appendChild(element);
+</xsl:text>
+    <xsl:text>                }
+</xsl:text>
+    <xsl:text>            }
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        let save_duplicate_index = duplicate_index;
+</xsl:text>
+    <xsl:text>        // dettach marks and label from group if not anymore visible
+</xsl:text>
+    <xsl:text>        for(;duplicate_index &lt; this.last_duplicate_index; duplicate_index++){
+</xsl:text>
+    <xsl:text>            let [transform,element] = this.duplicates[duplicate_index];
+</xsl:text>
+    <xsl:text>            this.group.removeChild(element);
+</xsl:text>
+    <xsl:text>        }
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>        this.last_duplicate_index = save_duplicate_index;
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>		return vectorscale(unit_vect, offset);
+</xsl:text>
+    <xsl:text>    }
+</xsl:text>
+    <xsl:text>}
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+  </xsl:template>
   <xsl:template match="/">
     <xsl:comment>
       <xsl:text>Made with SVGHMI. https://beremiz.org</xsl:text>
@@ -8027,9 +9409,21 @@
 </xsl:text>
           <xsl:text>                        let lang = get_current_lang_code();
 </xsl:text>
-          <xsl:text>                        arg = Date(arg).toLocaleString('en-US', options);
-</xsl:text>
-          <xsl:text>                        
+          <xsl:text>                        let f;
+</xsl:text>
+          <xsl:text>                        try{
+</xsl:text>
+          <xsl:text>                            f = new Intl.DateTimeFormat(lang, options);
+</xsl:text>
+          <xsl:text>                        } catch(e) {
+</xsl:text>
+          <xsl:text>                            f = new Intl.DateTimeFormat('en-US', options);
+</xsl:text>
+          <xsl:text>                        }
+</xsl:text>
+          <xsl:text>                        arg = f.format(arg);
+</xsl:text>
+          <xsl:text>
 </xsl:text>
           <xsl:text>                        /*    
 </xsl:text>
@@ -8349,6 +9743,430 @@
 </xsl:text>
           <xsl:text>}(); // eslint-disable-line    
 </xsl:text>
+          <xsl:text>/*
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>From https://github.com/keyvan-m-sadeghi/pythonic
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>Slightly modified in order to be usable in browser (i.e. not as a node.js module)
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>The MIT License (MIT)
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>Copyright (c) 2016 Assister.Ai
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>Permission is hereby granted, free of charge, to any person obtaining a copy of
+</xsl:text>
+          <xsl:text>this software and associated documentation files (the "Software"), to deal in
+</xsl:text>
+          <xsl:text>the Software without restriction, including without limitation the rights to
+</xsl:text>
+          <xsl:text>use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+</xsl:text>
+          <xsl:text>the Software, and to permit persons to whom the Software is furnished to do so,
+</xsl:text>
+          <xsl:text>subject to the following conditions:
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>The above copyright notice and this permission notice shall be included in all
+</xsl:text>
+          <xsl:text>copies or substantial portions of the Software.
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+</xsl:text>
+          <xsl:text>IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+</xsl:text>
+          <xsl:text>FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+</xsl:text>
+          <xsl:text>COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+</xsl:text>
+          <xsl:text>IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+</xsl:text>
+          <xsl:text>CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+</xsl:text>
+          <xsl:text>*/
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>class Iterator {
+</xsl:text>
+          <xsl:text>    constructor(generator) {
+</xsl:text>
+          <xsl:text>        this[Symbol.iterator] = generator;
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    async * [Symbol.asyncIterator]() {
+</xsl:text>
+          <xsl:text>        for (const element of this) {
+</xsl:text>
+          <xsl:text>            yield await element;
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    forEach(callback) {
+</xsl:text>
+          <xsl:text>        for (const element of this) {
+</xsl:text>
+          <xsl:text>            callback(element);
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    map(callback) {
+</xsl:text>
+          <xsl:text>        const result = [];
+</xsl:text>
+          <xsl:text>        for (const element of this) {
+</xsl:text>
+          <xsl:text>            result.push(callback(element));
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        return result;
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    filter(callback) {
+</xsl:text>
+          <xsl:text>        const result = [];
+</xsl:text>
+          <xsl:text>        for (const element of this) {
+</xsl:text>
+          <xsl:text>            if (callback(element)) {
+</xsl:text>
+          <xsl:text>                result.push(element);
+</xsl:text>
+          <xsl:text>            }
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        return result;
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    reduce(callback, initialValue) {
+</xsl:text>
+          <xsl:text>        let empty = typeof initialValue === 'undefined';
+</xsl:text>
+          <xsl:text>        let accumulator = initialValue;
+</xsl:text>
+          <xsl:text>        let index = 0;
+</xsl:text>
+          <xsl:text>        for (const currentValue of this) {
+</xsl:text>
+          <xsl:text>            if (empty) {
+</xsl:text>
+          <xsl:text>                accumulator = currentValue;
+</xsl:text>
+          <xsl:text>                empty = false;
+</xsl:text>
+          <xsl:text>                continue;
+</xsl:text>
+          <xsl:text>            }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>            accumulator = callback(accumulator, currentValue, index, this);
+</xsl:text>
+          <xsl:text>            index++;
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        if (empty) {
+</xsl:text>
+          <xsl:text>            throw new TypeError('Reduce of empty Iterator with no initial value');
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        return accumulator;
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    some(callback) {
+</xsl:text>
+          <xsl:text>        for (const element of this) {
+</xsl:text>
+          <xsl:text>            if (callback(element)) {
+</xsl:text>
+          <xsl:text>                return true;
+</xsl:text>
+          <xsl:text>            }
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        return false;
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    every(callback) {
+</xsl:text>
+          <xsl:text>        for (const element of this) {
+</xsl:text>
+          <xsl:text>            if (!callback(element)) {
+</xsl:text>
+          <xsl:text>                return false;
+</xsl:text>
+          <xsl:text>            }
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        return true;
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    static fromIterable(iterable) {
+</xsl:text>
+          <xsl:text>        return new Iterator(function * () {
+</xsl:text>
+          <xsl:text>            for (const element of iterable) {
+</xsl:text>
+          <xsl:text>                yield element;
+</xsl:text>
+          <xsl:text>            }
+</xsl:text>
+          <xsl:text>        });
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    toArray() {
+</xsl:text>
+          <xsl:text>        return Array.from(this);
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    next() {
+</xsl:text>
+          <xsl:text>        if (!this.currentInvokedGenerator) {
+</xsl:text>
+          <xsl:text>            this.currentInvokedGenerator = this[Symbol.iterator]();
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        return this.currentInvokedGenerator.next();
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    reset() {
+</xsl:text>
+          <xsl:text>        delete this.currentInvokedGenerator;
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>}
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>function rangeSimple(stop) {
+</xsl:text>
+          <xsl:text>    return new Iterator(function * () {
+</xsl:text>
+          <xsl:text>        for (let i = 0; i &lt; stop; i++) {
+</xsl:text>
+          <xsl:text>            yield i;
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>    });
+</xsl:text>
+          <xsl:text>}
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>function rangeOverload(start, stop, step = 1) {
+</xsl:text>
+          <xsl:text>    return new Iterator(function * () {
+</xsl:text>
+          <xsl:text>        for (let i = start; i &lt; stop; i += step) {
+</xsl:text>
+          <xsl:text>            yield i;
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>    });
+</xsl:text>
+          <xsl:text>}
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>function range(...args) {
+</xsl:text>
+          <xsl:text>    if (args.length &lt; 2) {
+</xsl:text>
+          <xsl:text>        return rangeSimple(...args);
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    return rangeOverload(...args);
+</xsl:text>
+          <xsl:text>}
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>function enumerate(iterable) {
+</xsl:text>
+          <xsl:text>    return new Iterator(function * () {
+</xsl:text>
+          <xsl:text>        let index = 0;
+</xsl:text>
+          <xsl:text>        for (const element of iterable) {
+</xsl:text>
+          <xsl:text>            yield [index, element];
+</xsl:text>
+          <xsl:text>            index++;
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>    });
+</xsl:text>
+          <xsl:text>}
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>const _zip = longest =&gt; (...iterables) =&gt; {
+</xsl:text>
+          <xsl:text>    if (iterables.length &lt; 2) {
+</xsl:text>
+          <xsl:text>        throw new TypeError("zip takes 2 iterables at least, "+iterables.length+" given");
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    return new Iterator(function * () {
+</xsl:text>
+          <xsl:text>        const iterators = iterables.map(iterable =&gt; Iterator.fromIterable(iterable));
+</xsl:text>
+          <xsl:text>        while (true) {
+</xsl:text>
+          <xsl:text>            const row = iterators.map(iterator =&gt; iterator.next());
+</xsl:text>
+          <xsl:text>            const check = longest ? row.every.bind(row) : row.some.bind(row);
+</xsl:text>
+          <xsl:text>            if (check(next =&gt; next.done)) {
+</xsl:text>
+          <xsl:text>                return;
+</xsl:text>
+          <xsl:text>            }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>            yield row.map(next =&gt; next.value);
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>    });
+</xsl:text>
+          <xsl:text>};
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>const zip = _zip(false), zipLongest= _zip(true);
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>function items(obj) {
+</xsl:text>
+          <xsl:text>    let {keys, get} = obj;
+</xsl:text>
+          <xsl:text>    if (obj instanceof Map) {
+</xsl:text>
+          <xsl:text>        keys = keys.bind(obj);
+</xsl:text>
+          <xsl:text>        get = get.bind(obj);
+</xsl:text>
+          <xsl:text>    } else {
+</xsl:text>
+          <xsl:text>        keys = function () {
+</xsl:text>
+          <xsl:text>            return Object.keys(obj);
+</xsl:text>
+          <xsl:text>        };
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>        get = function (key) {
+</xsl:text>
+          <xsl:text>            return obj[key];
+</xsl:text>
+          <xsl:text>        };
+</xsl:text>
+          <xsl:text>    }
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>    return new Iterator(function * () {
+</xsl:text>
+          <xsl:text>        for (const key of keys()) {
+</xsl:text>
+          <xsl:text>            yield [key, get(key)];
+</xsl:text>
+          <xsl:text>        }
+</xsl:text>
+          <xsl:text>    });
+</xsl:text>
+          <xsl:text>}
+</xsl:text>
+          <xsl:text>
+</xsl:text>
+          <xsl:text>/*
+</xsl:text>
+          <xsl:text>module.exports = {Iterator, range, enumerate, zip: _zip(false), zipLongest: _zip(true), items};
+</xsl:text>
+          <xsl:text>*/
+</xsl:text>
           <xsl:text>// svghmi.js
 </xsl:text>
           <xsl:text>
diff -r a88ac1760faf -r e87a2daace80 svghmi/parse_labels.ysl2
--- a/svghmi/parse_labels.ysl2	Thu May 26 23:41:10 2022 +0200
+++ b/svghmi/parse_labels.ysl2	Wed Jun 01 09:22:07 2022 +0200
@@ -13,7 +13,7 @@
 //      path value="path4" index="path4" type="HMI_LOCAL";
 //  }
 //
-const "pathregex",!"'^([^\[,]+)(\[[^\]]+\])?([\d,]*)$'"!;
+const "pathregex",!"'^([^\[,]+)(\[[^\]]+\])?([-.\d,]*)$'"!;
 
 template "*", mode="parselabel"
 {
diff -r a88ac1760faf -r e87a2daace80 svghmi/widget_xygraph.ysl2
--- a/svghmi/widget_xygraph.ysl2	Thu May 26 23:41:10 2022 +0200
+++ b/svghmi/widget_xygraph.ysl2	Wed Jun 01 09:22:07 2022 +0200
@@ -22,20 +22,35 @@
 
     path name="value" count="1+" accepts="HMI_INT,HMI_REAL" > value
 
-    arg name="size" accepts="int" > buffer size
+    arg name="xrange" accepts="int,time" > X axis range expressed either in samples or duration.
     arg name="xformat" count="optional" accepts="string" > format string for X label
     arg name="yformat" count="optional" accepts="string" > format string for Y label
-    arg name="ymin" count="optional" accepts="int,real" > minimum value foe Y axis
-    arg name="ymax" count="optional" accepts="int,real" > maximum value for Y axis
 }
 
 widget_class("XYGraph") {
     ||
         frequency = 1;
         init() {
-            [this.x_size,
+            let x_duration_s;
+            [x_duration_s,
              this.x_format, this.y_format] = this.args;
 
+            let timeunit = x_duration_s.slice(-1);
+            let factor = {
+                "s":1,
+                "m":60,
+                "h":3600,
+                "d":86400}[timeunit];
+            if(factor == undefined){
+                this.max_data_length = Number(x_duration_s);
+                this.x_duration = undefined;
+            }else{
+                let duration = factor*Number(x_duration_s.slice(0,-1));
+                this.max_data_length = undefined;
+                this.x_duration = duration*1000;
+            }
+
+
             // Min and Max given with paths are meant to describe visible range,
             // not to clip data.
             this.clip = false;
@@ -97,7 +112,6 @@
             }
 
             this.curves_data = this.curves.map(_unused => []);
-            this.max_data_length = this.args[0];
         }
 
         dispatch(value,oldval, index) {
@@ -114,13 +128,24 @@
             let ymax_damaged = false;
             let overflow;
 
-            if(data_length > this.max_data_length){
-                // remove first item
-                [this.xmin, overflow] = this.curves_data[index].shift();
-                data_length = data_length - 1;
+            if(this.max_data_length == undefined){
+                let peremption = time - this.x_duration;
+                let oldest = this.curves_data[index][0][0]
+                this.xmin = peremption;
+                if(oldest < peremption){
+                    // remove first item
+                    overflow = this.curves_data[index].shift()[1];
+                    data_length = data_length - 1;
+                }
             } else {
-                if(this.xmin == undefined){
-                    this.xmin = time;
+                if(data_length > this.max_data_length){
+                    // remove first item
+                    [this.xmin, overflow] = this.curves_data[index].shift();
+                    data_length = data_length - 1;
+                } else {
+                    if(this.xmin == undefined){
+                        this.xmin = time;
+                    }
                 }
             }
 
@@ -141,6 +166,7 @@
             }
             let Yrange = this.ymax - this.ymin;
 
+            // apply margin by moving min and max to enlarge range
             let [xMargin,yMargin] = zip(this.Margins, [Xrange, Yrange]).map(([m,l]) => m*l);
             [[this.dxmin, this.dxmax],[this.dymin,this.dymax]] =
                 [[this.xmin-xMargin, this.xmax+xMargin],
@@ -163,6 +189,7 @@
                         let px = base_point.x + xv.x + yv.x;
                         let py = base_point.y + xv.y + yv.y;
                         if(!this.fixed_y_range){
+                            // update min and max from curve data if needed
                             if(ymin_damaged && y < this.ymin) this.ymin = y;
                             if(ymax_damaged && y > this.ymax) this.ymax = y;
                         }
diff -r a88ac1760faf -r e87a2daace80 svghmi/widgets_common.ysl2
--- a/svghmi/widgets_common.ysl2	Thu May 26 23:41:10 2022 +0200
+++ b/svghmi/widgets_common.ysl2	Wed Jun 01 09:22:07 2022 +0200
@@ -181,7 +181,13 @@
             this.lastapply = indexes.map(() => undefined);
             this.inhibit = indexes.map(() => undefined);
             this.pending = indexes.map(() => undefined);
-            this.bound_unhinibit = this.unhinibit.bind(this);
+            this.bound_uninhibit = this.uninhibit.bind(this);
+
+            this.lastdispatch = indexes.map(() => undefined);
+            this.deafen = indexes.map(() => undefined);
+            this.incoming = indexes.map(() => undefined);
+            this.bound_undeafen = this.undeafen.bind(this);
+
             this.forced_frequency = freq;
             this.clip = true;
         }
@@ -225,7 +231,13 @@
                     if(inhibition != undefined){
                         clearTimeout(inhibition);
                         this.lastapply[i] = undefined;
-                        this.unhinibit(i);
+                        this.uninhibit(i);
+                    }
+                    let deafened = this.deafen[i];
+                    if(deafened != undefined){
+                        clearTimeout(deafened);
+                        this.lastdispatch[i] = undefined;
+                        this.undeafen(i);
                     }
                     let index = this.indexes[i];
                     if(this.relativeness[i])
@@ -313,7 +325,7 @@
             return apply_hmi_value(realindex, new_val);
         }
 
-        unhinibit(index){
+        uninhibit(index){
             this.inhibit[index] = undefined;
             let new_val = this.pending[index];
             this.pending[index] = undefined;
@@ -332,7 +344,7 @@
                 else {
                     let elapsed = now - lastapply;
                     this.pending[index] = new_val;
-                    this.inhibit[index] = setTimeout(this.bound_unhinibit, min_interval - elapsed, index);
+                    this.inhibit[index] = setTimeout(this.bound_uninhibit, min_interval - elapsed, index);
                 }
             }
             else {
@@ -354,13 +366,36 @@
             }
         }
         
+        undeafen(index){
+            this.deafen[index] = undefined;
+            let [new_val, old_val] = this.incoming[index];
+            this.incoming[index] = undefined;
+            this.dispatch(new_val, old_val, index);
+        }
+
         _dispatch(value, oldval, varnum) {
             let dispatch = this.dispatch;
             if(dispatch != undefined){
-                try {
-                    dispatch.call(this, value, oldval, varnum);
-                } catch(err) {
-                    console.log(err);
+                if(this.deafen[varnum] == undefined){
+                    let now = Date.now();
+                    let min_interval = 1000/this.frequency;
+                    let lastdispatch = this.lastdispatch[varnum];
+                    if(lastdispatch == undefined || now > lastdispatch + min_interval){
+                        this.lastdispatch[varnum] = now;
+                        try {
+                            dispatch.call(this, value, oldval, varnum);
+                        } catch(err) {
+                            console.log(err);
+                        }
+                    }
+                    else {
+                        let elapsed = now - lastdispatch;
+                        this.incoming[varnum] = [value, oldval];
+                        this.deafen[varnum] = setTimeout(this.bound_undeafen, min_interval - elapsed, varnum);
+                    }
+                }
+                else {
+                    this.incoming[varnum] = [value, oldval];
                 }
             }
         }
diff -r a88ac1760faf -r e87a2daace80 tests/projects/svghmi_xy/svghmi_0@svghmi/svghmi.svg
--- a/tests/projects/svghmi_xy/svghmi_0@svghmi/svghmi.svg	Thu May 26 23:41:10 2022 +0200
+++ b/tests/projects/svghmi_xy/svghmi_0@svghmi/svghmi.svg	Wed Jun 01 09:22:07 2022 +0200
@@ -306,13 +306,13 @@
      inkscape:window-height="836"
      id="namedview4"
      showgrid="false"
-     inkscape:zoom="2.6222222"
-     inkscape:cx="138.92196"
-     inkscape:cy="243.43713"
+     inkscape:zoom="0.32777778"
+     inkscape:cx="-105.99939"
+     inkscape:cy="106.14218"
      inkscape:window-x="0"
      inkscape:window-y="27"
      inkscape:window-maximized="1"
-     inkscape:current-layer="g2776" />
+     inkscape:current-layer="hmi0" />
   <rect
      inkscape:label="HMI:Page:Home"
      y="0"
@@ -322,100 +322,7 @@
      id="rect1016"
      style="color:#000000;opacity:1;fill:#d6d6d6;fill-opacity:1" />
   <g
-     transform="matrix(3.7795276,0,0,3.7795276,-24.745762,-208.06827)"
-     id="g2776"
-     inkscape:label="HMI:XYGraph|10:100:%.2D:%.4f@/TRENDVAL0@/TRENDVAL1">
-    <rect
-       inkscape:label="background"
-       ry="1.8520833"
-       rx="1.8520833"
-       y="87.995224"
-       x="22.985178"
-       height="114.9259"
-       width="167.31071"
-       id="rect2746"
-       style="color:#000000;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;vector-effect:none;fill:#e6e6e6;fill-opacity:1;fill-rule:nonzero;stroke:#000000;stroke-width:0.66866732;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;marker:none;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate" />
-    <path
-       style="fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#ff0000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-       d="m 155.83129,160.76911 c -6.48118,-0.65276 -10.17779,-21.29836 -15.40662,-31.02314 -3.53004,-8.41808 -7.5877,-1.29208 -10.4198,6.97869 -4.61524,10.2233 -10.32507,20.13252 -15.96731,14.06607 -7.74352,-19.32213 -18.607099,-4.75161 -26.390159,-23.86108 -4.63396,-13.32693 -11.88412,-10.90822 -16.09527,3.29105 -2.36066,8.20528 -4.35835,18.89169 -7.94811,21.41954 -2.80281,2.74222 -5.9827,1.11526 -8.29837,-5.00354"
-       id="path2748"
-       inkscape:connector-curvature="0"
-       sodipodi:nodetypes="cccccccc"
-       inkscape:label="curve_1" />
-    <path
-       inkscape:label="curve_0"
-       sodipodi:nodetypes="cccccccc"
-       inkscape:connector-curvature="0"
-       id="path2750"
-       d="m 55.011564,133.09949 c 6.481177,0.19426 10.177788,6.33834 15.406617,9.23241 3.530037,2.5052 7.587703,0.38452 10.419795,-2.07684 4.615243,-3.04243 10.325074,-5.99139 15.967312,-4.18603 7.743522,5.75022 18.607102,1.41407 26.390162,7.101 4.63396,3.96606 11.88412,3.24626 16.09527,-0.97941 2.36066,-2.44187 4.35835,-5.62212 7.94811,-6.3744 2.80281,-0.81608 5.9827,-0.3319 8.29837,1.48904"
-       style="fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#00b4cf;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
-    <path
-       inkscape:label="y_interval_minor_mark"
-       inkscape:connector-curvature="0"
-       id="path2752"
-       d="m 43.637172,172.91226 h -1.35783"
-       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-       sodipodi:nodetypes="cc" />
-    <path
-       inkscape:label="y_axis_line"
-       inkscape:connector-curvature="0"
-       id="path2754"
-       d="M 44.123362,185.11382 V 98.607125"
-       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-end:url(#marker6249)"
-       sodipodi:nodetypes="cc" />
-    <path
-       inkscape:label="y_interval_major_mark"
-       inkscape:connector-curvature="0"
-       id="path2756"
-       d="m 43.637172,167.88501 h -3.4745"
-       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />
-    <text
-       inkscape:label="y_axis_label"
-       id="text2760"
-       y="169.42703"
-       x="38.401363"
-       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10.58333302px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:end;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:end;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-       xml:space="preserve"><tspan
-         style="font-size:4.23333311px;text-align:end;text-anchor:end;stroke-width:0.26458332px"
-         y="169.42703"
-         x="38.401363"
-         id="tspan2758"
-         sodipodi:role="line">10</tspan></text>
-    <path
-       sodipodi:nodetypes="cc"
-       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-       d="m 63.393748,179.65255 v 1.35783"
-       id="path2764"
-       inkscape:connector-curvature="0"
-       inkscape:label="x_interval_minor_mark" />
-    <path
-       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.26499999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1;marker-end:url(#marker6185)"
-       d="M 39.02135,179.37991 H 169.44888"
-       id="path2766"
-       inkscape:connector-curvature="0"
-       inkscape:label="x_axis_line" />
-    <path
-       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-       d="m 68.420998,179.65255 v 3.4745"
-       id="path2768"
-       inkscape:connector-curvature="0"
-       inkscape:label="x_interval_major_mark" />
-    <text
-       xml:space="preserve"
-       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10.58333302px;line-height:125%;font-family:sans-serif;-inkscape-font-specification:'sans-serif, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:end;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:end;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;"
-       x="-184.6293"
-       y="70.044762"
-       id="text2772"
-       inkscape:label="x_axis_label"
-       transform="rotate(-90)"><tspan
-         sodipodi:role="line"
-         id="tspan2770"
-         x="-186.94957"
-         y="70.044762"
-         style="font-size:4.23333311px;stroke-width:0.26458332px;text-anchor:end;text-align:end;">10</tspan></text>
-  </g>
-  <g
-     transform="matrix(2.1611542,0,0,2.1611542,616.6367,256.27681)"
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