Function valueToAngle

src/traces/indicator/plot.js:358–365

(v)

    // circular gauge
    var theta = Math.PI / 2;
    function valueToAngle(v) {
        var min = trace.gauge.axis.range[0];
        var max = trace.gauge.axis.range[1];
        var angle = (v - min) / (max - min) * Math.PI - theta;
        if(angle < -theta) return -theta;
        if(angle > theta) return theta;
        return angle;
    }

    function arcPathGenerator(size) {
        return d3.svg.arc()