From 5bac19550ae74bb5561d1e1fbb55bdac8c5e3dd1 Mon Sep 17 00:00:00 2001
From: Pushkar Joshi
Date: Tue, 17 Apr 2012 17:38:36 -0700
Subject: Fairly stable version of polyline drawing code that works for paths
 on XY, YZ, XZ planes.

Current bugs: if the new point increases the bbox of the canvas, the entire canvas is shifted (due to inconsistency with center of rotation) AND the first two points added to planes other than XY have incorrect local coordinates (due to missing local coordinates)
---
 js/tools/PenTool.js | 97 ++++++++++++++++++-----------------------------------
 1 file changed, 32 insertions(+), 65 deletions(-)

(limited to 'js')

diff --git a/js/tools/PenTool.js b/js/tools/PenTool.js
index 7bc0364e..8abb41ef 100755
--- a/js/tools/PenTool.js
+++ b/js/tools/PenTool.js
@@ -735,87 +735,54 @@ exports.PenTool = Montage.create(ShapeTool, {
             var currAnchor = null;
             var xAdjustment = snapManager.getStageWidth()*0.5;
             var yAdjustment = snapManager.getStageHeight()*0.5;
-            var localPos = [[0,0,0,0],[0,0,0,0],[0,0,0,0]];
-            //if there already is a subpath canvas, it means the anchor points are in local space
-            //  so convert them to stage world space
+
             var numAnchors = this._selectedSubpath.getNumAnchors();
+            var bboxMin=null, bboxMax=null;
             if (this._selectedSubpathCanvas) {
-                //this transformation will take the path points from local space to stage world space
-                // *without* taking into account the transformation applied to this canvas
-                // (this is because we use the center of the bbox to find a place for the canvas)
-                var localToStageWorldMat = ViewUtils.getObjToStageWorldMatrix(this._selectedSubpathCanvas, false);//ViewUtils.getLocalToStageWorldMatrix(this._selectedSubpathCanvas, true, false);
-                for (i=0;i<numAnchors;i++){
-                    //convert this anchor from local to stage world
-                    var currAnchor = this._selectedSubpath.getAnchor(i);
-                    localPos[0] = [currAnchor.getPrevX(), currAnchor.getPrevY(), currAnchor.getPrevZ(),1];
-                    localPos[1] = [currAnchor.getPosX(), currAnchor.getPosY(), currAnchor.getPosZ(),1];
-                    localPos[2] = [currAnchor.getNextX(), currAnchor.getNextY(), currAnchor.getNextZ(),1];
-                    for (d=0;d<3;d++) {
-                        localPos[d] = MathUtils.transformAndDivideHomogeneousPoint(localPos[d], localToStageWorldMat);
-                        //add half the stage width and height to the X and Y coord.
-                        localPos[d][0]+= xAdjustment;
-                        localPos[d][1]+= yAdjustment;
+                //if there already is a subpath canvas, it means the anchor points are in local space
+                //  so convert them to stage world space
+                //compute the bbox in local space
+                this._selectedSubpath.createSamples(false);
+                bboxMin = this._selectedSubpath.getBBoxMin();
+                bboxMax = this._selectedSubpath.getBBoxMax();
+
+                // *********** Test for Too Large Canvas *************
+                //check if the last point added made this canvas is now bigger than the max canvas size
+                var canvasTooLarge = false;
+                for (d=0;d<3;d++){
+                    if (bboxMax[d]-bboxMin[d]>this._MAX_CANVAS_DIMENSION){
+                        canvasTooLarge = true;
                     }
-                    currAnchor.setPrevPos(localPos[0][0],localPos[0][1],localPos[0][2]);
-                    currAnchor.setPos(localPos[1][0],localPos[1][1],localPos[1][2]);
-                    currAnchor.setNextPos(localPos[2][0],localPos[2][1],localPos[2][2]);
                 }
-                this._selectedSubpath.makeDirty();
-            }
-
-            //compute the bbox in stage-world space
-            this._selectedSubpath.createSamples(true); //we need to compute samples to get the bounding box center in stage world space
-            var bboxMin = this._selectedSubpath.getBBoxMin();
-            var bboxMax = this._selectedSubpath.getBBoxMax();
-
-            //check if the last point added made this canvas is now bigger than the max canvas size
-            for (d=0;d<3;d++){
-                if (bboxMax[d]-bboxMin[d]>this._MAX_CANVAS_DIMENSION){
+                if (canvasTooLarge){
                     console.log("PEN: Warning! Ignoring last added point because canvas size too large");
                     this._selectedSubpath.removeAnchor(numAnchors-1);
                     numAnchors--;
+
                     //recompute the bbox of this subpath
-                    this._selectedSubpath.createSamples(true);
+                    this._selectedSubpath.createSamples(false);
                     bboxMin = this._selectedSubpath.getBBoxMin();
                     bboxMax = this._selectedSubpath.getBBoxMax();
-                    break;
                 }
-            }
 
+                //convert the midpoint of this bbox to stage world space
+                var bboxMid = VecUtils.vecInterpolate(3, bboxMin, bboxMax, 0.5);
+                //this._selectedSubpathCanvasCenter = ViewUtils.localToStageWorld(bboxMid, this._selectedSubpathCanvas);
+                var localToStageWorldMat = ViewUtils.getLocalToStageWorldMatrix(this._selectedSubpathCanvas, false, false);
+                this._selectedSubpathCanvasCenter = MathUtils.transformAndDivideHomogeneousPoint(bboxMid, localToStageWorldMat);
+                this._selectedSubpathCanvasCenter[0]+= xAdjustment;
+                this._selectedSubpathCanvasCenter[1]+= yAdjustment;
+            } else {
+                //compute the bbox in stage-world space (the points are already in stage world space)
+                this._selectedSubpath.createSamples(true);
+                bboxMin = this._selectedSubpath.getBBoxMin();
+                bboxMax = this._selectedSubpath.getBBoxMax();
+                this._selectedSubpathCanvasCenter = VecUtils.vecInterpolate(3, bboxMin, bboxMax, 0.5);
 
-            this._selectedSubpathCanvasCenter = VecUtils.vecInterpolate(3, bboxMin, bboxMax, 0.5);
+                //todo convert the path points into local coordinates
 
-            //update the plane matrix of this subpath by querying the element mediator
-            if (this._selectedSubpathCanvas) {
-                this._selectedSubpathPlaneMat = ElementMediator.getMatrix(this._selectedSubpathCanvas);
             }
-            var planeMatInv = glmat4.inverse(this._selectedSubpathPlaneMat, []);
-            
-            // ***** compute local coordinates of the anchor points *****
-            for (i=0;i<numAnchors;i++){
-                var currAnchor = this._selectedSubpath.getAnchor(i);
-
-                localPos[0] = [currAnchor.getPrevX(), currAnchor.getPrevY(), currAnchor.getPrevZ(),1];
-                localPos[1] = [currAnchor.getPosX(), currAnchor.getPosY(), currAnchor.getPosZ(),1];
-                localPos[2] = [currAnchor.getNextX(), currAnchor.getNextY(), currAnchor.getNextZ(),1];
-                for (d=0;d<3;d++) {
-                    localPos[d][0]-= this._selectedSubpathCanvasCenter[0];
-                    localPos[d][1]-= this._selectedSubpathCanvasCenter[1];
-                    localPos[d][2]-= this._selectedSubpathCanvasCenter[2];
-
-                    // ***** unproject all the centered points and convert them to 2D (plane space)*****
-                    // (undo the projection step performed by the browser)
-                    localPos[d] = this._unprojectPt(localPos[d], 1400); //todo get the perspective distance from the canvas
-                    localPos[d] = MathUtils.transformPoint(localPos[d], planeMatInv);
-
-                    //explicitly remove the third (Z) component since it should always be zero
-                    localPos[d][2]=0;
-                }
 
-                currAnchor.setPrevPos(localPos[0][0],localPos[0][1],localPos[0][2]);
-                currAnchor.setPos(localPos[1][0],localPos[1][1],localPos[1][2]);
-                currAnchor.setNextPos(localPos[2][0],localPos[2][1],localPos[2][2]);
-            }
             this._selectedSubpath.makeDirty();
             this._selectedSubpath.createSamples(false);
             this._selectedSubpath.offsetPerBBoxMin();
-- 
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