Function zoomMove

src/plots/polar/polar.js:990–1010

(dx, dy)

    }

    function zoomMove(dx, dy) {
        dx = dx * scaleX;
        dy = dy * scaleY;

        var x1 = x0 + dx;
        var y1 = y0 + dy;

        var rr0 = xy2r(x0, y0);
        var rr1 = Math.min(xy2r(x1, y1), radius);
        var a0 = xy2a(x0, y0);
        var path1;
        var cpath;

        if(clampAndSetR0R1(rr0, rr1)) {
            path1 = path0 + _this.pathSector(r1);
            if(r0) path1 += _this.pathSector(r0);
            // keep 'starting' angle
            cpath = pathCorner(r0, a0) + pathCorner(r1, a0);
        }
        applyZoomMove(path1, cpath);
    }

    function findPolygonRadius(x, y, va0, va1) {
        var xy = helpers.findIntersectionXY(va0, va1, va0, [x - cxx, cyy - y]);