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// widget_circularbar.ysl2

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widget_class("CircularBar") {

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    ||

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        frequency = 10;

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        range = undefined;

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        dispatch(value) {

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            this.display_val = value;

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            this.request_animate();

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        }

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        animate(){

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            if(this.value_elt)

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                this.value_elt.textContent = String(this.display_val);

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

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            let [cx,cy] = this.center;

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            let [rx,ry] = this.proportions;

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            let tip = start + (end-start)*Number(this.display_val)/(max-min);

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            let size = 0;

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            if (tip-start > Math.PI)

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                size = 1;

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            else

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                size = 0;

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            this.path_elt.setAttribute('d', "M "+(cx+rx*Math.cos(start))+","+(cy+ry*Math.sin(start))+

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                                            " A "+rx+","+ry+

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                                            " 0 "+size+

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                                            " 1 "+(cx+rx*Math.cos(tip))+","+(cy+ry*Math.sin(tip)));

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        }

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        init() {

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            let [start, end, cx, cy, rx, ry] = ["start", "end", "cx", "cy", "rx", "ry"].

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                map(tag=>Number(this.path_elt.getAttribute('sodipodi:'+tag)))

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            if (ry == 0) 

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                ry = rx;

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            if (start > end)

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                end = end + 2*Math.PI;

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            let [min,max] = [[this.min_elt,0],[this.max_elt,100]].map(([elt,def],i)=>elt?

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                Number(elt.textContent) :

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                this.args.length >= i+1 ? this.args[i] : def);

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            this.range = [min, max, start, end];

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            this.center = [cx, cy];

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            this.proportions = [rx, ry];

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        }

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    ||

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}

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widget_defs("CircularBar") {

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    labels("path");

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    optional_labels("value min max");

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}