Added LineToCircle intersection method.

Author: photonstorm

v3/src/geom/intersects/LineToCircle.js

@@ -0,0 +1,60 @@
+//  Based on code by Matt DesLauriers
+//  https://github.com/mattdesl/line-circle-collision/blob/master/LICENSE.md
+
+var Contains = require('../circle/Contains');
+
+var tmp = { x: 0, y: 0 };
+
+var LineToCircle = function (line, circle, nearest)
+{
+    if (nearest === undefined) { nearest = tmp; }
+
+    if (Contains(circle, line.x1, line.y1))
+    {
+        nearest.x = line.x1;
+        nearest.y = line.y1;
+
+        return true;
+    }
+
+    if (Contains(circle, line.x2, line.y2))
+    {
+        nearest.x = line.x2;
+        nearest.y = line.y2;
+
+        return true;
+    }
+
+    var dx = line.x2 - line.x1;
+    var dy = line.y2 - line.y1;
+
+    var lcx = circle.x - line.x1;
+    var lcy = circle.y - line.y1;
+
+    //  project lc onto d, resulting in vector p
+    var dLen2 = (dx * dx) + (dy * dy);
+    var px = dx;
+    var py = dy;
+
+    if (dLen2 > 0)
+    {
+        var dp = ((lcx * dx) + (lcy * dy)) / dLen2;
+
+        px *= dp;
+        py *= dp;
+    }
+
+    nearest.x = line.x1 + px;
+    nearest.y = line.y1 + py;
+    
+    //  len2 of p
+    var pLen2 = (px * px) + (py * py);
+    
+    return (
+        pLen2 <= dLen2 &&
+        ((px * dx) + (py * dy)) >= 0 &&
+        Contains(circle, nearest.x, nearest.y)
+    );
+};
+
+module.exports = LineToCircle;

v3/src/geom/intersects/index.js

@@ -1,9 +1,11 @@
+//  Phaser.Geom.Intersects
 
 module.exports = {
 
     CircleToCircle: require('./CircleToCircle'),
     CircleToRectangle: require('./CircleToRectangle'),
     GetRectangleIntersection: require('./GetRectangleIntersection'),
+    LineToCircle: require('./LineToCircle'),
     LineToLine: require('./LineToLine'),
     LineToRectangle: require('./LineToRectangle'),
     PointToLine: require('./PointToLine'),