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// widget_meter.ysl2

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template "widget[@type='Meter']", mode="widget_defs" {

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    param "hmi_element";

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    |     frequency: 10,

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    labels("needle range");

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    optional_labels("value min max");

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    |     dispatch: function(value) {

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    |         if(this.value_elt)

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    |             this.value_elt.textContent = String(value);

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

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    |         let length = Math.max(0,Math.min(totallength,(Number(value)-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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    |     origin: undefined,

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    |     range: undefined,

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    |     init: function() {

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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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    |         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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}