Cap bezier handles inside the scale

diff --git a/src/Chart.Line.js b/src/Chart.Line.js
index d5213bfc4702b8f2770f97470abb3cd3a90ff295..0b3079ffe11237700a08b9d8bc232a7abd6dcda2 100644 (file)
--- 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);
                                }