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// widget_meter.ysl2

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widget_desc("Meter") {

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    longdesc

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    ||

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    Meter widget moves the end of "needle" labeled path along "range" labeled

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    path, according to value of the single accepted variable.

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    Needle is reduced to a single segment. If "min" a "max" labeled texts

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    are provided, or if first and second argument are given, then they are used

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    as respective minimum and maximum value. Otherwise, value is expected to be

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    in between 0 and 100.

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    If "value" labeled text is found, then its content is replaced by value.

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    ||

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    shortdesc > Moves "needle" along "range"

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    arg name="min" count="optional" accepts="int,real" > minimum value

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    arg name="max" count="optional" accepts="int,real" > maximum value

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    // TODO: add printf-like format

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    path name="value" accepts="HMI_INT,HMI_REAL" > Value to display

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}

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widget_class("Meter"){

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    ||

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        frequency = 10;

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        origin = undefined;

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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,totallength] = this.range;

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            let length = Math.max(0,Math.min(totallength,(Number(this.display_val)-min)*totallength/(max-min)));

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

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            this.needle_elt.setAttribute('d', "M "+this.origin.x+","+this.origin.y+" "+tip.x+","+tip.y);

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        }

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        init() {

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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, this.range_elt.getTotalLength()]

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            this.origin = this.needle_elt.getPointAtLength(0);

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        }

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}

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widget_defs("Meter") {

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    labels("needle range");

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    optional_labels("value min max");

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}

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