From: Nick Downie <hello@nickdownie.com>
Date: Sun, 17 Aug 2014 21:32:36 +0000 (+0100)
Subject: Cap bezier handles inside the scale
X-Git-Tag: v1.0.1-beta.4~1^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=179d80a93b64cf107ee219886c43eb6e212594f5;p=thirdparty%2FChart.js.git

Cap bezier handles inside the scale
---

diff --git a/src/Chart.Line.js b/src/Chart.Line.js
index d5213bfc4..0b3079ffe 100644
--- a/src/Chart.Line.js
+++ b/src/Chart.Line.js
@@ -291,6 +291,24 @@
 							nextPoint(point, pointsWithValues, index),
 							tension
 						);
+
+						// Prevent the bezier going outside of the bounds of the graph
+
+						// Cap puter bezier handles to the upper/lower scale bounds
+						if (point.controlPoints.outer.y > this.scale.endPoint){
+							point.controlPoints.outer.y = this.scale.endPoint;
+						}
+						else if (point.controlPoints.outer.y < this.scale.startPoint){
+							point.controlPoints.outer.y = this.scale.startPoint;
+						}
+
+						// Cap inner bezier handles to the upper/lower scale bounds
+						if (point.controlPoints.inner.y > this.scale.endPoint){
+							point.controlPoints.inner.y = this.scale.endPoint;
+						}
+						else if (point.controlPoints.inner.y < this.scale.startPoint){
+							point.controlPoints.inner.y = this.scale.startPoint;
+						}
 					},this);
 				}