1 files changed, 48 insertions, 30 deletions

diff --git a/js/helper-classes/3D/snap-manager.js b/js/helper-classes/3D/snap-manager.js
index 372be345..cf8a91db 100755
--- a/js/helper-classes/3D/snap-manager.js
+++ b/js/helper-classes/3D/snap-manager.js
@@ -40,6 +40,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
 
         // keep a reference to the most recent hitRecord.  Used for drawing feedback on the stage
         _lastHit : { value: null, writable: true },
+        _hitRecords : { value: [], writable: true },
 
         // keep a list of objects to avoid snapping to
         _avoidList : { value: [], writable: true },
@@ -210,9 +211,9 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                 var stage = this.getStage();
                                 var parentPt;
                                 if (quadPt)
-                                        parentPt = Vector.create([quadPt[0], quadPt[1], 0.0]);
+                                        parentPt = [quadPt[0], quadPt[1], 0.0];
                                 else
-                                        parentPt = Vector.create([xScreen, yScreen, 0.0]);
+                                        parentPt = [xScreen, yScreen, 0.0];
                                 var vec = viewUtils.parentToChildVec(parentPt, stage);
                                 if (vec)
                                 {
@@ -274,6 +275,11 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                         }       //if (hitRecArray.length == 0)
 
                         var rtnHit;
+
+            // Save reference to hit records to verify last hit record's element matches browser's elementFromPoint
+            this._hitRecords.length = 0;
+            this._hitRecords = hitRecArray;
+
                         if (hitRecArray.length > 0)
                         {
                                 this.sortHitRecords( hitRecArray );
@@ -315,7 +321,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
 
                         // get the point to the lower left of the plane point and
                         // see if it falls within the snap distance
-                        var origin = Vector.create(  [-0.5*this.getStageWidth(), -0.5*this.getStageHeight()] );
+                        var origin = [-0.5*this.getStageWidth(), -0.5*this.getStageHeight()];
                         var planePt = hitRec.getLocalPoint();
                         var dToOrigin = MathUtils.vecSubtract(planePt, origin);
                         var nx = Math.floor( dToOrigin[0]/dx),
@@ -332,11 +338,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                 return false;
                         }
 
-                        var pt00 = Vector.create( [
-                                origin[0] + nx*dx,
-                                origin[1] + ny*dy,
-                                0.0
-                        ] );
+                        var pt00 = [ origin[0] + nx*dx, origin[1] + ny*dy, 0.0 ];
                         var planeMat = hitRec.getPlaneMatrix();
                         var scrPt2 = viewUtils.postViewToStageWorld( MathUtils.transformPoint(pt00,planeMat),  stage );
                         scrPt2 = MathUtils.makeDimension3( scrPt2 );
@@ -360,11 +362,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                 return true;
 
                         // check the far corner point and 2 edges out from it
-                        var pt11 = Vector.create( [
-                                origin[0] + (nx+1)*dx,
-                                origin[1] + (ny+1)*dy,
-                                0.0
-                        ] );
+                        var pt11 = [ origin[0] + (nx+1)*dx, origin[1] + (ny+1)*dy, 0.0 ];
                         var scrPt4 = viewUtils.postViewToStageWorld( MathUtils.transformPoint(pt11,planeMat),  stage );
                         scrPt4 = MathUtils.makeDimension3( scrPt4 );
                         scrPt4 = vecUtils.vecAdd(3, viewUtils.viewToScreen( MathUtils.transformPoint(scrPt4, stageMat) ), offset );
@@ -414,11 +412,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                 horizontalLineCount = 2;
                         }
 
-                        var edgePt = Vector.create( [
-                                gridOrigin[0] + nx*dx,
-                                gridOrigin[1] + ny*dy,
-                                0.0
-                        ] );
+                        var edgePt = [ gridOrigin[0] + nx*dx, gridOrigin[1] + ny*dy, 0.0 ];
                         var scrPt2 = viewUtils.postViewToStageWorld( MathUtils.transformPoint(edgePt,planeMat),  stage );
                         scrPt2 = MathUtils.makeDimension3( scrPt2 );
                         scrPt2 = vecUtils.vecAdd(3, viewUtils.viewToScreen( MathUtils.transformPoint(scrPt2, stageMat) ), offset );
@@ -843,7 +837,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                 MathUtils.makeDimension3( stageOffset );
 
                                 var x = vPt[0],  y = hPt[1];
-                                var localPt = Vector.create( [x,y,0,1] );
+                                var localPt = [x,y,0,1];
                                 var viewPt = MathUtils.transformPoint( localPt, planeToViewMat );
                                 var scrPt = vecUtils.vecAdd(3, viewUtils.viewToScreen( viewPt ), stageOffset );
 
@@ -1185,7 +1179,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                         // Calculate the local point
                                         var planeMat;
                                         var mat = viewUtils.getMatrixFromElement( elt );
-                                        var wp = Vector.create([0,0,1,0]);
+                                        var wp = [0,0,1,0];
                                         wp = MathUtils.transformPlane( wp, mat );
                                         var wpMat = drawUtils.getPlaneToWorldMatrix(wp, MathUtils.getPointOnPlane(wp));
                                         //var wpMatInv = wpMat.inverse();
@@ -1277,7 +1271,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                          {
                                                 // convert to GL coordinates
                                                 var glPt = this.globalScreenToWebGL( targetScrPt,  elt );
-                                                var eyePt = Vector.create( [0, 0, world.getViewDistance()] );
+                                                var eyePt = [0, 0, world.getViewDistance()];
                                                 var dir = vecUtils.vecSubtract(3, glPt, eyePt);
 
                                                 // recursively go through the tree testing all objects
@@ -1528,7 +1522,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                         viewUtils.pushViewportObj( elt );
                                         var cop = viewUtils.getCenterOfProjection();
                                         viewUtils.popViewportObj();
-                                        var s2v = Matrix.Translation(Vector.create([-cop[0], -cop[1], 0]));
+                                        var s2v = Matrix.Translation([-cop[0], -cop[1], 0]);
                                         var vToNDC = Matrix.I(4);
                                         vToNDC[0] = 1.0/(0.5*world.getViewportWidth());
                                         vToNDC[5] = 1.0/(0.5*world.getViewportHeight());
@@ -1566,11 +1560,11 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                         tmpPt2 = MathUtils.applyHomogeneousCoordinate( tmpPt2 );
 
                                         // project the 2 object space points onto the original plane of the object
-                                        var tmpPt3 = MathUtils.vecIntersectPlane( tmpPt1, vecUtils.vecSubtract(3, tmpPt2, tmpPt1), Vector.create([0,0,1,0]) );
+                                        var tmpPt3 = MathUtils.vecIntersectPlane( tmpPt1, vecUtils.vecSubtract(3, tmpPt2, tmpPt1), [0,0,1,0]);
                                         //console.log( "object space pt: " + tmpPt3 );
 
                                         // get the z value in NDC space of the projection plane
-                                        var ndcPt = MathUtils.transformHomogeneousPoint( Vector.create( [0, 0, 0] ), glToNDC );
+                                        var ndcPt = MathUtils.transformHomogeneousPoint( [0, 0, 0], glToNDC );
                                         ndcPt = MathUtils.applyHomogeneousCoordinate( ndcPt );
                                         var zNDC = ndcPt[2];
 
@@ -1642,7 +1636,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                         var drawingGrid = drawUtils.isDrawingGrid();
 
                                         // get the Z axis of the matrix
-                                        var dir = Vector.create([mat[8], mat[9], mat[10]]);
+                                        var dir = [mat[8], mat[9], mat[10]];
                                         dir = vecUtils.vecNormalize(3, dir, 1.0);
                                         var x = Math.abs(dir[0]),
                                                 y = Math.abs(dir[1]),
@@ -1653,7 +1647,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                         //x = 0;  y = 0;  z = 1;                // X/Y plane
 
                                         var id;
-                                        var plane = Vector.create([0, 0, 0, 0]);
+                                        var plane = [0, 0, 0, 0];
                                         var change = false;
                                         if (x > y) {
                                                 if (x > z) {
@@ -1823,7 +1817,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                                 MathUtils.makeDimension3( stageOffset );
 
                                                 var x = vPt[0],  y = hPt[1];
-                                                var localPt = Vector.create( [x,y,0,1] );
+                                                var localPt = [x,y,0,1];
                                                 var planeToViewMat = this.getPlaneToViewMat();
                                                 var viewPt = MathUtils.transformPoint( localPt, planeToViewMat );
                                                 var scrPt = vecUtils.vecAdd(3, viewUtils.viewToScreen( viewPt ), stageOffset );
@@ -1872,7 +1866,7 @@ var SnapManager = exports.SnapManager = Montage.create(Component, {
                                                 MathUtils.makeDimension3( stageOffset );
 
                                                 var y = hPt[1],  x = vPt[0];