Function findPolygonRadius

src/plots/polar/polar.js:1012–1015

(x, y, va0, va1)

    }

    function findPolygonRadius(x, y, va0, va1) {
        var xy = helpers.findIntersectionXY(va0, va1, va0, [x - cxx, cyy - y]);
        return norm(xy[0], xy[1]);
    }

    function zoomMoveForPolygons(dx, dy) {
        var x1 = x0 + dx;