Function normalize

_benchmarks/sample_echarts.js:766–777

(out, v)

        return out;
    }
    function normalize(out, v) {
        var d = len(v);
        if (d === 0) {
            out[0] = 0;
            out[1] = 0;
        }
        else {
            out[0] = v[0] / d;
            out[1] = v[1] / d;
        }
        return out;
    }
    function distance(v1, v2) {
        return Math.sqrt((v1[0] - v2[0]) * (v1[0] - v2[0])
            + (v1[1] - v2[1]) * (v1[1] - v2[1]));