3

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

     4

    ||

     5

    class MeterWidget extends Widget{

     6

        frequency = 10;

     7

        origin = undefined;

     8

        range = undefined;

     9

    10

        dispatch(value) {

    11

            if(this.value_elt)

    12

                this.value_elt.textContent = String(value);

    13

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

    14

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

    15

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

    16

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

    17

        }

    18

    19

        init() {

    20

            let min = this.min_elt ?

    21

                        Number(this.min_elt.textContent) :

    22

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

    23

            let max = this.max_elt ?

    24

                        Number(this.max_elt.textContent) :

    25

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

    26

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

    27

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

    28

        }

    29

    30

    }

    31

    ||

    32

}

    38

    |,