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// widget_circuralslider.ysl2

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    ||

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        frequency = 5;

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        range = undefined;

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        circle = undefined;

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        handle_pos = undefined;

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        curr_value = 0;

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        drag = false;

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        enTimer = false;

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        last_drag = false;

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        dispatch(value) {

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            let [min,max,start,totallength] = this.range;

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            //save current value inside widget

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            this.curr_value = value;

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            //check if in range

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            if (this.curr_value > max){

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                this.curr_value = max;

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                this.apply_hmi_value(0, this.curr_value);

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            }

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            else if (this.curr_value < min){

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                this.curr_value = min;

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                this.apply_hmi_value(0, this.curr_value);

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            }

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            if(this.value_elt)

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                this.value_elt.textContent = String(value);

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            //don't update if draging and setpoint ghost doesn't exist

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            if(!this.drag || (this.setpoint_elt != undefined)){

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                this.update_DOM(value, this.handle_elt);

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            }

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        }

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        update_DOM(value, elt){

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            let [min,max,totalDistance] = this.range;

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            let length = Math.max(0,Math.min((totalDistance),(Number(value)-min)/(max-min)*(totalDistance)));

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            let tip = this.range_elt.getPointAtLength(length);

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            elt.setAttribute('transform',"translate("+(tip.x-this.handle_pos.x)+","+(tip.y-this.handle_pos.y)+")");

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            // show or hide ghost if exists

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            if(this.setpoint_elt != undefined){

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                if(this.last_drag!= this.drag){

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                    if(this.drag){

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                        this.setpoint_elt.setAttribute("style", this.setpoint_style);

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                    }else{

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                        this.setpoint_elt.setAttribute("style", "display:none");

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                    }

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                    this.last_drag = this.drag;

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                }

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            }

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        }

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        on_release(evt) {

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            //unbind events

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            window.removeEventListener("touchmove", this.on_bound_drag, true);

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            window.removeEventListener("mousemove", this.on_bound_drag, true);

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            window.removeEventListener("mouseup", this.bound_on_release, true)

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            window.removeEventListener("touchend", this.bound_on_release, true);

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            window.removeEventListener("touchcancel", this.bound_on_release, true);

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            //reset drag flag

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            if(this.drag){

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                this.drag = false;

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            }

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            // get final position

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            this.update_position(evt);

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        }

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        on_drag(evt){

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            //ignore drag event for X amount of time and if not selected

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            if(this.enTimer && this.drag){

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                this.update_position(evt);

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                //reset timer

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                this.enTimer = false;

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                setTimeout("{hmi_widgets['"+this.element_id+"'].enTimer = true;}", 100);

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            }

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        }

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        update_position(evt){

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            if(this.drag && this.enTimer){

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                var svg_dist = 0;

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                //calculate center of widget in html

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                // --TODO maybe it would be better to bind this part to window change size event ???

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                let [xdest,ydest,svgWidth,svgHeight] = page_desc[current_visible_page].bbox;

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                let [cX, cY,fiStart,fiEnd,minMax,x1,y1,width,height] = this.circle;

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                let htmlCirc = this.range_elt.getBoundingClientRect();

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                let cxHtml = ((htmlCirc.right-htmlCirc.left)/(width)*(cX-x1))+htmlCirc.left;

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                let cyHtml = ((htmlCirc.bottom-htmlCirc.top)/(height)*(cY-y1))+htmlCirc.top;

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                //get mouse coordinates

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                let mouseX = undefined;

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                let mouseY = undefined;

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                if (evt.type.startsWith("touch")){

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                    mouseX = Math.ceil(evt.touches[0].clientX);

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                    mouseY = Math.ceil(evt.touches[0].clientY);

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                }

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                else{

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                    mouseX = evt.pageX;

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                    mouseY = evt.pageY;

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                }

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                //calculate angle

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                let fi = Math.atan2(cyHtml-mouseY, mouseX-cxHtml);

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                // transform from 0 to 2PI

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                if (fi > 0){

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                    fi = 2*Math.PI-fi;

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                }

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                else{

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                    fi = -fi;

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                }

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                //offset it to 0

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                fi = fi - fiStart;

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                if (fi < 0){

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                    fi = fi + 2*Math.PI;

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                }

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                //get handle distance from mouse position

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                if(fi<fiEnd){

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                   this.curr_value=(fi)/(fiEnd)*(this.range[1]-this.range[0]);

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                }

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                else if(fiEnd<fi && fi<fiEnd+minMax){

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                    this.curr_value = this.range[1];

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                }

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                else{

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                    this.curr_value = this.range[0];

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                }

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                //apply value to hmi

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                this.apply_hmi_value(0, Math.ceil(this.curr_value));

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                //redraw handle

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                this.request_animate();

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            }

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        }

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        animate(){

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            // redraw handle on screen refresh

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            // check if setpoint(ghost) handle exsist otherwise update main handle

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            if(this.setpoint_elt != undefined){

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                this.update_DOM(this.curr_value, this.setpoint_elt);

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            }

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            else{

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                this.update_DOM(this.curr_value, this.handle_elt);

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            }

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        }

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        on_select(evt){

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            //enable drag flag and timer

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            this.drag = true;

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            this.enTimer = true;

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            //bind events

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            window.addEventListener("touchmove", this.on_bound_drag, true);

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            window.addEventListener("mousemove", this.on_bound_drag, true);

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            window.addEventListener("mouseup", this.bound_on_release, true);

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            window.addEventListener("touchend", this.bound_on_release, true);

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            window.addEventListener("touchcancel", this.bound_on_release, true);

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            //update postion on mouse press

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            this.update_position(evt);

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            //prevent next events

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            evt.stopPropagation();

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        }

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        init() {

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            //get min max

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            let min = this.min_elt ?

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                        Number(this.min_elt.textContent) :

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                        this.args.length >= 1 ? this.args[0] : 0;

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            let max = this.max_elt ?

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                        Number(this.max_elt.textContent) :

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                        this.args.length >= 2 ? this.args[1] : 100;

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            //fiStart ==> offset

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            let fiStart = Number(this.range_elt.getAttribute('sodipodi:start'));

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            let fiEnd = Number(this.range_elt.getAttribute('sodipodi:end'));

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            fiEnd = fiEnd - fiStart;

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            //fiEnd ==> size of angle

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            if (fiEnd < 0){

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                fiEnd = 2*Math.PI + fiEnd;

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            }

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            //min max barrier angle

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            let minMax = (2*Math.PI - fiEnd)/2;

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            //get parameters from svg

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            let cX = Number(this.range_elt.getAttribute('sodipodi:cx'));

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            let cY = Number(this.range_elt.getAttribute('sodipodi:cy'));

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            this.range_elt.style.strokeMiterlimit="0"; //eliminates some weird border around html object

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            this.range = [min, max,this.range_elt.getTotalLength()];

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            let cPos = this.range_elt.getBBox();

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            this.handle_pos = this.range_elt.getPointAtLength(0);

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            this.circle = [cX, cY,fiStart,fiEnd,minMax,cPos.x,cPos.y,cPos.width,cPos.height];

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            //bind functions

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            this.bound_on_select = this.on_select.bind(this);

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            this.bound_on_release = this.on_release.bind(this);

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            this.on_bound_drag = this.on_drag.bind(this);

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            this.handle_elt.addEventListener("mousedown", this.bound_on_select);

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            this.element.addEventListener("mousedown", this.bound_on_select);

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            this.element.addEventListener("touchstart", this.bound_on_select);

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            //touch recognised as page drag without next command

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            document.body.addEventListener("touchstart", function(e){}, false);

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            //save ghost style

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            //save ghost style

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            if(this.setpoint_elt != undefined){

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                this.setpoint_style = this.setpoint_elt.getAttribute("style");

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                this.setpoint_elt.setAttribute("style", "display:none");

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            }

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        }

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    param "hmi_element";

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    labels("handle range");

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    optional_labels("value min max setpoint");

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    |,

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}