Function rotateMove

src/plots/polar/polar.js:1222–1240

(dx, dy)

    }

    function rotateMove(dx, dy) {
        // disable for inner drag boxes
        if(rngIndex === 0) return;

        var x1 = tx + dx;
        var y1 = ty + dy;

        angle1 = Math.atan2(cy - y1, x1 - cx);
        if(_this.vangles) angle1 = snapToVertexAngle(angle1, _this.vangles);
        angle1 = rad2deg(angle1);

        var transform = strTranslate(cx, cy) + strRotate(-angle1);
        layers['radial-axis'].attr('transform', transform);
        layers['radial-line'].select('line').attr('transform', transform);

        var fullLayoutNow = _this.gd._fullLayout;
        var polarLayoutNow = fullLayoutNow[_this.id];
        _this.updateRadialAxisTitle(fullLayoutNow, polarLayoutNow, angle1);
    }

    function rerangeMove(dx, dy) {
        // project (dx, dy) unto unit radial axis vector