Function getClosestCorner

src/traces/scatter/line_points.js:241–248

(pt1, pt2)

    // a segment pt1->pt2 entirely outside the nearby region:
    // find the corner it gets closest to touching
    function getClosestCorner(pt1, pt2) {
        var dx = pt2[0] - pt1[0];
        var m = (pt2[1] - pt1[1]) / dx;
        var b = (pt1[1] * pt2[0] - pt2[1] * pt1[0]) / dx;

        if(b > 0) return [m > 0 ? xEdge0 : xEdge1, yEdge1];
        else return [m > 0 ? xEdge1 : xEdge0, yEdge0];
    }

    function updateEdge(pt) {
        var x = pt[0];