From 266eb10765a9fe1619093c47d19d7c4d6bec9e5c Mon Sep 17 00:00:00 2001
From: Wouter Commandeur <wouter.commandeur@webprint.nl>
Date: Sat, 31 May 2014 12:13:59 +0200
Subject: [PATCH] Fix Phaser.Line.intersectsPoints for floating point
 inaccuracy. Round the result to 3 decimals, should be enough precision and
 solves the problems. See:
 http://www.html5gamedevs.com/topic/6840-phaserlineintersects-does-not-work-for-floats/

---
 src/geom/Line.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/geom/Line.js b/src/geom/Line.js
index 75f21de85..10da09506 100644
--- a/src/geom/Line.js
+++ b/src/geom/Line.js
@@ -375,8 +375,13 @@ Phaser.Line.intersectsPoints = function (a, b, e, f, asSegment, result) {
         return null;
     }
 
-    result.x = ((b1 * c2) - (b2 * c1)) / denom;
-    result.y = ((a2 * c1) - (a1 * c2)) / denom;
+    /*
+     Round to 3 decimals here, due to javascript floating point is 'broken'
+     http://stackoverflow.com/questions/11832914/round-to-at-most-2-decimal-places-in-javascript
+     See workaround explanation there in accepted answer there..
+     */
+    result.x = Math.round( ((((b1 * c2) - (b2 * c1)) / denom)+0.00001)*1000 ) / 1000;
+    result.y = Math.round( ((((a2 * c1) - (a1 * c2)) / denom)+0.00001)*1000 ) / 1000;
 
     if (asSegment)
     {