1 files changed, 11 insertions, 18 deletions

diff --git a/js/tools/PanTool.js b/js/tools/PanTool.js
index ba40b020..73095c57 100644
--- a/js/tools/PanTool.js
+++ b/js/tools/PanTool.js
@@ -19,6 +19,7 @@ exports.PanTool = Montage.create(toolBase,
         _globalPt :{value: [0,0] , writable:true},
         _globalToUCWorld :{value: [] , writable:true},
         _lastGPt :{value: [0,0], writable:true},
+        _lastY :{value: 0, writable:true},
 
     Configure: {
         value: function ( doActivate )
@@ -220,6 +221,7 @@ exports.PanTool = Montage.create(toolBase,
                                         var tmpLocal   = MathUtils.transformAndDivideHomogeneousPoint( this._globalPt, globalToLocalMat );
 
                                         this._lastGPt = this._globalPt.slice();
+                                        this._lastY = this._lastGPt[1];
 
                                         // set up the matrices we will be needing
                                         var eltToStageWorldMat = glmat4.multiply( ucMat, viewUtils.getObjToStageWorldMatrix(elt, true), []);
@@ -275,14 +277,19 @@ exports.PanTool = Montage.create(toolBase,
                 {
                         if (this._isDrawing)
                         {
-                                //console.log( "PanTool.mouseMove (drag)" );
-
                                 // get the global screen point
                                 var gPt = [point.x, point.y, this._globalPt[2]];
+                                if (this._altKeyDown)
+                                {
+                                        var dy = 5*(point.y - this._lastY);
+                                        this._globalPt[2] += dy;
+                                        gPt = [this._lastGPt[0], this._lastGPt[1], this._globalPt[2]];
+                                }
 
                                 // update the scrollbars
                                 var deltaGPt = VecUtils.vecSubtract(2, gPt, this._lastGPt);
                                 this._lastGPt = gPt.slice();
+                                this._lastY = point.y;
 
                                 var oldLeft = this.application.ninja.stage._iframeContainer.scrollLeft,
                                         oldTop  = this.application.ninja.stage._iframeContainer.scrollTop;
@@ -297,27 +304,13 @@ exports.PanTool = Montage.create(toolBase,
                                 this.updateGlobalToUCWorldMatrix();
 
                                 var wPt = MathUtils.transformAndDivideHomogeneousPoint( gPt, this._globalToUCWorld );
-                                //console.log( "wPt: " + wPt );
                                 var delta = vecUtils.vecSubtract( 3, wPt, this._worldPt );
-                                if (this._altKeyDown)
-                                {
-                                        //console.log( "moveZ" );
-                                        var dist = vecUtils.vecMag(2, delta);
-                                        delta[0] = 0;  delta[1] = 0;  delta[2] = dist;
-                                        var dy = point.y - this._globalPt[1];
-                                        if (dy < 0)  delta[2] = -delta[2];
-                                }
-                                else
-                                {
-                                        console.log( "NOT MOVING Z" );
+                                
+                                if (!this._altKeyDown)
                                         delta[2] = 0;
-                                }
                                 var transMat = Matrix.Translation( delta );
                                 this._worldPt = wPt;
 
-                                if (this._altKeyDown)
-                                        this._globalPt[1] = point.y;
-
                                 // update everything
                                 this.applyDeltaMat( transMat );
                         }