// widget_meter.ysl2


template "widget[@type='Meter']", mode="widget_defs" {
    param "hmi_element";
    |     frequency: 10,
    labels("needle range");
    optional_labels("value min max");
    |     dispatch: function(value) {
    |         if(this.value_elt)
    |             this.value_elt.textContent = String(value);
    |         let [min,max,totallength] = this.range;
    |         let length = Math.max(0,Math.min(totallength,(Number(value)-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);
    |     },
    |     origin: undefined,
    |     range: undefined,
    |     init: function() {
    |         let min = this.min_elt ?
    |                     Number(this.min_elt.textContent) :
    |                     this.args.length >= 1 ? this.args[0] : 0;
    |         let max = this.max_elt ?
    |                     Number(this.max_elt.textContent) :
    |                     this.args.length >= 2 ? this.args[1] : 100;
    |         this.range = [min, max, this.range_elt.getTotalLength()]
    |         this.origin = this.needle_elt.getPointAtLength(0);
    |     },
}