Merge pull request #182 from ericmueller/Canvas-interaction

Canvas interaction

1 files changed, 18 insertions, 2 deletions

diff --git a/js/tools/PanTool.js b/js/tools/PanTool.js
index 0537a27b..ce7606a1 100755
--- a/js/tools/PanTool.js
+++ b/js/tools/PanTool.js
@@ -331,10 +331,26 @@ exports.PanTool = Montage.create(toolBase,
                                 
                                 if (!this._altKeyDown)
                                         delta[2] = 0;
-                                var transMat = Matrix.Translation( delta );
-                                this._worldPt = wPt;
+
+                                // limit the change
+                                var ucMat = viewUtils.getMatrixFromElement(this.application.ninja.currentDocument.documentRoot);
+                                var tooMuch = false
+                                if ((ucMat[12] >  12000) && (delta[0] > 0))  tooMuch = true;
+                                if ((ucMat[12] < -12000) && (delta[0] < 0))  tooMuch = true;
+                                if ((ucMat[13] >  12000) && (delta[1] > 0))  tooMuch = true;
+                                if ((ucMat[13] < -12000) && (delta[1] < 0))  tooMuch = true;
+                                if ((ucMat[14] >  12000) && (delta[2] > 0))  tooMuch = true;
+                                if ((ucMat[14] < -12000) && (delta[2] < 0))  tooMuch = true;
+                                if (tooMuch)
+                                {
+                                        this._isDrawing = false;
+                                        delta = [0,0,0];
+                                }
+                                else
+                                        this._worldPt = wPt;
 
                                 // update everything
+                                var transMat = Matrix.Translation( delta );
                                 this.applyDeltaMat( transMat );
                         }
                 }