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Raphael.fn.drawGrid = function (x, y, w, h, wv, hv, color) {
color = color || "#000";
var path = ["M", Math.round(x) + .5, Math.round(y) + .5, "L", Math.round(x + w) + .5, Math.round(y) + .5, Math.round(x + w) + .5, Math.round(y + h) + .5, Math.round(x) + .5, Math.round(y + h) + .5, Math.round(x) + .5, Math.round(y) + .5],
rowHeight = h / hv,
columnWidth = w / wv;
for (var i = 1; i < hv; i++) {
path = path.concat(["M", Math.round(x) + .5, Math.round(y + i * rowHeight) + .5, "H", Math.round(x + w) + .5]);
}
for (i = 1; i < wv; i++) {
path = path.concat(["M", Math.round(x + i * columnWidth) + .5, Math.round(y) + .5, "V", Math.round(y + h) + .5]);
}
return this.path(path.join(",")).attr({stroke: color});
};
function getAnchors(p1x, p1y, p2x, p2y, p3x, p3y) {
var l1 = (p2x - p1x) / 2,
l2 = (p3x - p2x) / 2,
a = Math.atan((p2x - p1x) / Math.abs(p2y - p1y)),
b = Math.atan((p3x - p2x) / Math.abs(p2y - p3y));
a = p1y < p2y ? Math.PI - a : a;
b = p3y < p2y ? Math.PI - b : b;
var alpha = Math.PI / 2 - ((a + b) % (Math.PI * 2)) / 2,
dx1 = l1 * Math.sin(alpha + a),
dy1 = l1 * Math.cos(alpha + a),
dx2 = l2 * Math.sin(alpha + b),
dy2 = l2 * Math.cos(alpha + b);
return {
x1: p2x - dx1,
y1: p2y + dy1,
x2: p2x + dx2,
y2: p2y + dy2
};
}
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