From 7f811848488751390a37e4969552b176fe68d1ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Lehni?= <juerg@scratchdisk.com>
Date: Sat, 30 Jul 2011 11:38:17 +0100
Subject: [PATCH] Only intersect lines if their lengths are not conflicting
with Numerical.EPSILON comparison of the cross product in Line#intersect().
---
src/path/Curve.js | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/src/path/Curve.js b/src/path/Curve.js
index a49cf6ae..74b560a0 100644
--- a/src/path/Curve.js
+++ b/src/path/Curve.js
@@ -760,8 +760,15 @@ var Curve = this.Curve = Base.extend(/** @lends Curve# */{
return [0.5 * (w[0].x + w[5].x)];
// Compute intersection of chord from first control point to last
// with x-axis.
- if (isFlatEnough(w))
- return [xAxis.intersect(new Line(w[0], w[5], true)).x];
+ if (isFlatEnough(w)) {
+ var line = new Line(w[0], w[5], true);
+ // Compare the line's squared length with EPSILON. If we're
+ // below, #intersect() will return null because of division
+ // by near-zero.
+ return [ line.vector.getLength(true) < Numerical.EPSILON
+ ? line.point.x
+ : xAxis.intersect(line).x ];
+ }
}
// Otherwise, solve recursively after