Function pathCorner

src/plots/polar/polar.js:876–891

(r, a)

    }

    function pathCorner(r, a) {
        if(r === 0) return _this.pathSector(2 * chw);

        var da = chl / r;
        var am = a - da;
        var ap = a + da;
        var rb = Math.max(0, Math.min(r, radius));
        var rm = rb - chw;
        var rp = rb + chw;

        return 'M' + ra2xy(rm, am) +
            'A' + [rm, rm] + ' 0,0,0 ' + ra2xy(rm, ap) +
            'L' + ra2xy(rp, ap) +
            'A' + [rp, rp] + ' 0,0,1 ' + ra2xy(rp, am) +
            'Z';
    }

    // (x,y) is the pt at middle of the va0 <-> va1 edge
    //