RUNTIME: Variable trace now uses limited list and buffer instead of flags in instance tree that was requiring systematical instance tree traversal, and worst size buffer. Forcing and retain still use tree traversal.
// widget_meter.ysl2
widget_desc("Meter") {
longdesc
||
Meter widget moves the end of "needle" labeled path along "range" labeled
path, according to value of the single accepted variable.
Needle is reduced to a single segment. If "min" a "max" labeled texts
are provided, or if first and second argument are given, then they are used
as respective minimum and maximum value. Otherwise, value is expected to be
in between 0 and 100.
||
shortdesc > Moves "needle" along "range"
arg name="min" count="optional" accepts="int,real" > minimum value
arg name="max" count="optional" accepts="int,real" > maximum value
path name="value" accepts="HMI_INT,HMI_REAL" > Value to display
}
widget_class("Meter"){
||
frequency = 10;
origin = undefined;
range = undefined;
dispatch(value) {
this.display_val = value;
this.request_animate();
}
animate(){
if(this.value_elt)
this.value_elt.textContent = String(this.display_val);
let [min,max,totallength] = this.range;
let length = Math.max(0,Math.min(totallength,(Number(this.display_val)-min)*totallength/(max-min)));
let tip = this.range_elt.getPointAtLength(length);
this.needle_elt.setAttribute('d', "M "+this.origin.x+","+this.origin.y+" "+tip.x+","+tip.y);
}
init() {
let [min,max] = [[this.min_elt,0],[this.max_elt,100]].map(([elt,def],i)=>elt?
Number(elt.textContent) :
this.args.length >= i+1 ? this.args[i] : def);
this.range = [min, max, this.range_elt.getTotalLength()]
this.origin = this.needle_elt.getPointAtLength(0);
}
||
}
widget_defs("Meter") {
labels("needle range");
optional_labels("min max");
}