From d7d78d4a4e8cf82c56379d25efbe679b3b823abc Mon Sep 17 00:00:00 2001
From: Pushkar Joshi
Date: Thu, 1 Mar 2012 11:22:46 -0800
Subject: show feedback on mouseover on a part of the path where a new anchor
 will be added if clicked

---
 js/helper-classes/RDGE/GLSubpath.js | 147 ++++++++++++++++++++++++++++++------
 1 file changed, 124 insertions(+), 23 deletions(-)

(limited to 'js/helper-classes')

diff --git a/js/helper-classes/RDGE/GLSubpath.js b/js/helper-classes/RDGE/GLSubpath.js
index f3d8ad36..2fb91d33 100755
--- a/js/helper-classes/RDGE/GLSubpath.js
+++ b/js/helper-classes/RDGE/GLSubpath.js
@@ -505,7 +505,6 @@ GLSubpath.prototype._isWithinBoundingBox = function(point, ctrlPts, radius) {
 GLSubpath.prototype.pickAnchor = function (pickX, pickY, pickZ, radius) {
     var numAnchors = this._Anchors.length;
     var selAnchorIndex = -1;
-    var retCode = this.SEL_NONE;
     var radSq = radius * radius;
     var minDistance = Infinity;
     //check if the clicked location is close to the currently selected anchor position
@@ -515,9 +514,23 @@ GLSubpath.prototype.pickAnchor = function (pickX, pickY, pickZ, radius) {
         if (distSq < minDistance && distSq < radSq) {
             selAnchorIndex = this._selectedAnchorIndex;
             minDistance = distSq;
-            retCode = retCode | this.SEL_ANCHOR;
+        } else {
+            //check the prev and next of the selected anchor if the above did not register a hit
+            distSq = this._Anchors[this._selectedAnchorIndex].getPrevDistanceSq(pickX, pickY, pickZ);
+            if (distSq < minDistance && distSq < radSq){
+                selAnchorIndex = this._selectedAnchorIndex;
+                minDistance = distSq;
+            } else {
+                //check the next for this anchor point
+                distSq = this._Anchors[this._selectedAnchorIndex].getNextDistanceSq(pickX, pickY, pickZ);
+                if (distSq<minDistance && distSq<radSq){
+                    selAnchorIndex = this._selectedAnchorIndex;
+                    minDistance = distSq;
+                }
+            }
         }
     }
+    
     //now check if the click location is close to any anchor position
     if (selAnchorIndex===-1) {
         for (var i = 0; i < numAnchors; i++) {
@@ -532,12 +545,97 @@ GLSubpath.prototype.pickAnchor = function (pickX, pickY, pickZ, radius) {
     return selAnchorIndex;
 }
 
+GLSubpath.prototype.isWithinBBox =function(x,y,z){
+    if (this._BBoxMin[0]>x || this._BBoxMin[1]>y || this._BBoxMin[2]>z){
+        return false;
+    }
+    if (this._BBoxMax[0]<x || this._BBoxMax[1]<y || this._BBoxMax[2]<z){
+        return false;
+    }
+    return true;
+}
+
+//pick the path point closest to the specified location, return null if some anchor point (or its handles) is within radius, else return the parameter distance
+GLSubpath.prototype.pathHitTest = function (pickX, pickY, pickZ, radius) {
+    var numAnchors = this._Anchors.length;
+    var selAnchorIndex = -1;
+    var retParam = null;
+    var radSq = radius * radius;
+    var minDistance = Infinity;
+    
+    //check if the location is close to the currently selected anchor position
+    if (this._selectedAnchorIndex>=0 && this._selectedAnchorIndex<this._Anchors.length){
+        var distSq = this._Anchors[this._selectedAnchorIndex].getDistanceSq(pickX, pickY, pickZ);
+        //check the anchor point
+        if (distSq < minDistance && distSq < radSq) {
+            selAnchorIndex = this._selectedAnchorIndex;
+            minDistance = distSq;
+        }
+    }
+    //check the prev and next of the selected anchor if the above did not register a hit
+    if (this._selectedAnchorIndex>=0 && selAnchorIndex === -1) {
+        var distSq = this._Anchors[this._selectedAnchorIndex].getPrevDistanceSq(pickX, pickY, pickZ);
+        if (distSq < minDistance && distSq < radSq){
+            selAnchorIndex = this._selectedAnchorIndex;
+            minDistance = distSq;
+        } else {
+            //check the next for this anchor point
+            distSq = this._Anchors[this._selectedAnchorIndex].getNextDistanceSq(pickX, pickY, pickZ);
+            if (distSq<minDistance && distSq<radSq){
+                selAnchorIndex = this._selectedAnchorIndex;
+                minDistance = distSq;
+            }
+        }
+    }
+
+    //now check if the location is close to any anchor position
+    if (selAnchorIndex===-1) {
+        for (var i = 0; i < numAnchors; i++) {
+            var distSq = this._Anchors[i].getDistanceSq(pickX, pickY, pickZ);
+            //check the anchor point
+            if (distSq < minDistance && distSq < radSq) {
+                selAnchorIndex = i;
+                minDistance = distSq;
+            }
+        }//for every anchor i
+    }
+
+    //finally check if the location is close to the curve itself
+    if (selAnchorIndex===-1) {
+        //first check if the input location is within the bounding box
+        if (this.isWithinBBox(pickX,pickY,pickZ)){
+            var numSegments = this._isClosed ? numAnchors : numAnchors-1;
+            for (var i = 0; i < numSegments; i++) {
+                var nextIndex = (i+1)%numAnchors;
+                //check if the point is close to the bezier segment between anchor i and anchor nextIndex
+                var controlPoints = Vector.create([Vector.create([this._Anchors[i].getPosX(),this._Anchors[i].getPosY(),this._Anchors[i].getPosZ()]),
+                    Vector.create([this._Anchors[i].getNextX(),this._Anchors[i].getNextY(),this._Anchors[i].getNextZ()]),
+                    Vector.create([this._Anchors[nextIndex].getPrevX(),this._Anchors[nextIndex].getPrevY(),this._Anchors[nextIndex].getPrevZ()]),
+                    Vector.create([this._Anchors[nextIndex].getPosX(),this._Anchors[nextIndex].getPosY(),this._Anchors[nextIndex].getPosZ()])]);
+                var point = Vector.create([pickX, pickY, pickZ]);
+                if (this._isWithinBoundingBox(point, controlPoints, radius)) {
+                    //var intersectParam = this._checkIntersection(controlPoints, 0.0, 1.0, point, radius);
+                    var intersectParam = this._checkIntersectionWithSamples(this._anchorSampleIndex[i], this._anchorSampleIndex[nextIndex], point, radius);
+                    console.log("intersectParam:"+intersectParam);
+                    if (intersectParam){
+                        selAnchorIndex=i;
+                        retParam = intersectParam-i; //make the retParam go from 0 to 1
+                        break;
+                    }
+                }
+            }//for every anchor i
+        }//if is within bbox
+    }
+    return [selAnchorIndex,retParam];
+}     //GLSubpath.pathHitTest function
+
 
 //pick the path point closest to the specified location, return null if some anchor point (or its handles) is within radius, else return the parameter distance
 GLSubpath.prototype.pickPath = function (pickX, pickY, pickZ, radius) {
     var numAnchors = this._Anchors.length;
     var selAnchorIndex = -1;
     var retCode = this.SEL_NONE;
+    var retParam = null;
     var radSq = radius * radius;
     var minDistance = Infinity;
     //check if the clicked location is close to the currently selected anchor position
@@ -580,33 +678,36 @@ GLSubpath.prototype.pickPath = function (pickX, pickY, pickZ, radius) {
             }
         }
     }
-    var retParam = null;
+
     if (retCode !== this.SEL_NONE) {
         retCode = retCode | this.SEL_PATH; //ensure that path is also selected if anything else is selected
         this._selectedAnchorIndex = selAnchorIndex;
     } else {
         this._selectedAnchorIndex = -1;
-        var numSegments = this._isClosed ? numAnchors : numAnchors-1;
-        for (var i = 0; i < numSegments; i++) {
-            var nextIndex = (i+1)%numAnchors;
-            //check if the point is close to the bezier segment between anchor i and anchor nextIndex
-            var controlPoints = Vector.create([Vector.create([this._Anchors[i].getPosX(),this._Anchors[i].getPosY(),this._Anchors[i].getPosZ()]),
-                Vector.create([this._Anchors[i].getNextX(),this._Anchors[i].getNextY(),this._Anchors[i].getNextZ()]),
-                Vector.create([this._Anchors[nextIndex].getPrevX(),this._Anchors[nextIndex].getPrevY(),this._Anchors[nextIndex].getPrevZ()]),
-                Vector.create([this._Anchors[nextIndex].getPosX(),this._Anchors[nextIndex].getPosY(),this._Anchors[nextIndex].getPosZ()])]);
-            var point = Vector.create([pickX, pickY, pickZ]);
-            if (this._isWithinBoundingBox(point, controlPoints, radius)) {
-                //var intersectParam = this._checkIntersection(controlPoints, 0.0, 1.0, point, radius);
-                var intersectParam = this._checkIntersectionWithSamples(this._anchorSampleIndex[i], this._anchorSampleIndex[nextIndex], point, radius);
-                console.log("intersectParam:"+intersectParam);
-                if (intersectParam){
-                    retCode = retCode | this.SEL_PATH;
-                    retParam = intersectParam-i; //make the retParam go from 0 to 1
-                    this._selectedAnchorIndex = i;
-                    break;
+        //first check if the input location is within the bounding box
+        if (this.isWithinBBox(pickX,pickY,pickZ)){
+            var numSegments = this._isClosed ? numAnchors : numAnchors-1;
+            for (var i = 0; i < numSegments; i++) {
+                var nextIndex = (i+1)%numAnchors;
+                //check if the point is close to the bezier segment between anchor i and anchor nextIndex
+                var controlPoints = Vector.create([Vector.create([this._Anchors[i].getPosX(),this._Anchors[i].getPosY(),this._Anchors[i].getPosZ()]),
+                    Vector.create([this._Anchors[i].getNextX(),this._Anchors[i].getNextY(),this._Anchors[i].getNextZ()]),
+                    Vector.create([this._Anchors[nextIndex].getPrevX(),this._Anchors[nextIndex].getPrevY(),this._Anchors[nextIndex].getPrevZ()]),
+                    Vector.create([this._Anchors[nextIndex].getPosX(),this._Anchors[nextIndex].getPosY(),this._Anchors[nextIndex].getPosZ()])]);
+                var point = Vector.create([pickX, pickY, pickZ]);
+                if (this._isWithinBoundingBox(point, controlPoints, radius)) {
+                    //var intersectParam = this._checkIntersection(controlPoints, 0.0, 1.0, point, radius);
+                    var intersectParam = this._checkIntersectionWithSamples(this._anchorSampleIndex[i], this._anchorSampleIndex[nextIndex], point, radius);
+                    console.log("intersectParam:"+intersectParam);
+                    if (intersectParam){
+                        retCode = retCode | this.SEL_PATH;
+                        retParam = intersectParam-i; //make the retParam go from 0 to 1
+                        this._selectedAnchorIndex = i;
+                        break;
+                    }
                 }
-            }
-        }//for every anchor i
+            }//for every anchor i
+        }//is within bounding box
     }
     this._selectMode = retCode;
     return retParam;
-- 
cgit v1.2.3


From 0b7f2f54738d2c1ea480b9bac7d3a750b1ef4df6 Mon Sep 17 00:00:00 2001
From: Pushkar Joshi
Date: Thu, 1 Mar 2012 15:29:17 -0800
Subject: first attempt at rendering the brush stroke as a collection of
 polylines (number of polylines equals the stroke width)

---
 js/helper-classes/RDGE/GLBrushStroke.js | 47 +++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

(limited to 'js/helper-classes')

diff --git a/js/helper-classes/RDGE/GLBrushStroke.js b/js/helper-classes/RDGE/GLBrushStroke.js
index 5d773c2d..f5b0bce1 100755
--- a/js/helper-classes/RDGE/GLBrushStroke.js
+++ b/js/helper-classes/RDGE/GLBrushStroke.js
@@ -139,7 +139,8 @@ function GLBrushStroke() {
             var numPoints = this._Points.length;
 
             //**** add samples to the path if needed...linear interpolation for now
-            if (numPoints>1) {
+            //if (numPoints>1) {
+            if (0){
                 var threshold = this._WETNESS_FACTOR*this._strokeWidth;
                 var prevPt = this._Points[0];
                 var prevIndex = 0;
@@ -331,7 +332,7 @@ function GLBrushStroke() {
         }
         */
 
-
+        /*
         var R2 = this._strokeWidth;
         var R = R2*0.5;
         var hardness = 0; //for a pencil, this is always 1 //TODO get hardness parameter from user interface
@@ -359,6 +360,48 @@ function GLBrushStroke() {
             //ctx.globalCompositeOperation = 'source-in';
             //ctx.rect(x-R, y-R, R2, R2);
         }
+        */
+
+        //todo test how to render the path as a bunch of moveTo and lineTos (for calligraphic brush styles)
+        var numTraces = this._strokeWidth;
+        var halfNumTraces = numTraces/2;
+        var deltaDisplacement = [1,0];//[this._strokeWidth/numTraces, 0]; //a horizontal line brush
+        var startPos = [-this._strokeWidth/2,0];
+        for (var t=0;t<numTraces;t++){
+            var disp = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
+            //ctx.globalCompositeOperation = 'source-over';
+            var distFromMiddle = Math.abs(halfNumTraces-t);
+            var alphaVal = 1.0 - (distFromMiddle/halfNumTraces);
+            ctx.save();
+            ctx.lineWidth=this._strokeWidth/10;//4;
+            if (ctx.lineWidth<2)
+                ctx.lineWidth=2;
+            ctx.lineJoin="bevel";
+            ctx.lineCap="butt";
+            if (t<numTraces/2)
+                ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
+            else
+                ctx.strokeStyle="rgba("+255+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
+            ctx.translate(disp[0],disp[1]);
+            ctx.beginPath();
+            ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
+            for (var i=0;i<numPoints;i++){
+                ctx.lineTo(this._Points[i][0]-bboxMin[0], this._Points[i][1]-bboxMin[1]);
+            }
+            ctx.stroke();
+            ctx.restore();
+        }
+
+        /*
+        ctx.beginPath();
+        ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
+        for (var i=1;i<numPoints;i++){
+            ctx.lineTo(this._Points[i][0]-bboxMin[0], this._Points[i][1]-bboxMin[1]);
+        }
+        ctx.lineWidth=1.0;
+        ctx.strokeStyle = "black";
+        ctx.stroke();
+        */
 
         ctx.restore();
     } //render()
-- 
cgit v1.2.3


From 1b68bb87c458877cb850a96d8a093d6064bc41dc Mon Sep 17 00:00:00 2001
From: Pushkar Joshi
Date: Fri, 2 Mar 2012 12:23:44 -0800
Subject: Catmull-Rom spline sampling for the brush stroke, and options for
 stroke size, stroke hardness and both stroke colors (left and right ---
 temporarily using the stroke and fill colors respectively)

---
 js/helper-classes/RDGE/GLBrushStroke.js | 72 ++++++++++++++++++++++++++++++---
 1 file changed, 66 insertions(+), 6 deletions(-)

(limited to 'js/helper-classes')

diff --git a/js/helper-classes/RDGE/GLBrushStroke.js b/js/helper-classes/RDGE/GLBrushStroke.js
index f5b0bce1..c1469977 100755
--- a/js/helper-classes/RDGE/GLBrushStroke.js
+++ b/js/helper-classes/RDGE/GLBrushStroke.js
@@ -31,6 +31,8 @@ function GLBrushStroke() {
     //stroke information
     this._strokeWidth = 0.0;
     this._strokeColor = [0.4, 0.4, 0.4, 1.0];
+    this._secondStrokeColor = this._strokeColor;
+    this._strokeHardness = 100;
     this._strokeMaterial;
     this._strokeStyle = "Solid";
 
@@ -39,7 +41,7 @@ function GLBrushStroke() {
     this._WETNESS_FACTOR = 0.25;
 
     //prevent extremely long paths that can take a long time to render
-    this._MAX_ALLOWED_SAMPLES = 500;
+    this._MAX_ALLOWED_SAMPLES = 5000;
 
     //drawing context
     this._world = null;
@@ -106,6 +108,8 @@ function GLBrushStroke() {
     this.setStrokeMaterial = function (m) { this._strokeMaterial = m; }
     this.getStrokeColor = function () { return this._strokeColor; }
     this.setStrokeColor = function (c) { this._strokeColor = c; }
+    this.setSecondStrokeColor = function(c){this._secondStrokeColor=c;}
+    this.setStrokeHardness = function(h){this._strokeHardness=h;}
     this.getStrokeStyle = function () { return this._strokeStyle; }
     this.setStrokeStyle = function (s) { this._strokeStyle = s; }
 
@@ -133,7 +137,7 @@ function GLBrushStroke() {
             this._Points[i][2]+=tz;
         }
     }
-
+    
     this.computeMetaGeometry = function(){
         if (this._dirty){
             var numPoints = this._Points.length;
@@ -172,6 +176,44 @@ function GLBrushStroke() {
                 }
             }
 
+            //**** add samples to the long sections of the path --- Catmull-Rom spline interpolation
+            if (numPoints>1) {
+                var numInsertedPoints = 0;
+                var threshold = 5;//0.25*this._strokeWidth; //this determines whether a segment between two sample is too long
+                var prevPt = this._Points[0];
+                for (var i=1;i<numPoints;i++){
+                    var pt = this._Points[i];
+                    var diff = [pt[0]-prevPt[0], pt[1]-prevPt[1]];
+                    var distance = Math.sqrt(diff[0]*diff[0]+diff[1]*diff[1]);
+                    if (distance>threshold){
+                        //build the control polygon for the Catmull-Rom spline (prev. 2 points and next 2 points)
+                        var prev = (i===1) ? i-1 : i-2;
+                        var next = (i===numPoints-1) ? i : i+1;
+                        var ctrlPts = [this._Points[prev], this._Points[i-1], this._Points[i], this._Points[next]];
+                        //insert points along the prev. to current point
+                        var numNewPoints = Math.floor(distance/threshold);
+                        for (var j=0;j<numNewPoints;j++){
+                            var param = (j+1)/(numNewPoints+1);
+                            var newpt = this._CatmullRomSplineInterpolate(ctrlPts, param);
+                            //insert new point before point i
+                            this._Points.splice(i, 0, newpt);
+                            i++;
+                            numInsertedPoints++;
+                        }
+                        this._dirty=true;
+                    }
+                    prevPt=pt;
+                    //update numPoints to match the new length
+                    numPoints = this._Points.length;
+
+                    //end this function if the numPoints has gone above the max. size specified
+                    if (numPoints> this._MAX_ALLOWED_SAMPLES){
+                        console.log("leaving the resampling because numPoints is greater than limit:"+this._MAX_ALLOWED_SAMPLES);
+                        break;
+                    }
+                }
+                console.log("Inserted "+numInsertedPoints+" additional CatmullRom points");
+            }
             // *** compute the bounding box *********
             this._BBoxMin = [Infinity, Infinity, Infinity];
             this._BBoxMax = [-Infinity, -Infinity, -Infinity];
@@ -362,7 +404,6 @@ function GLBrushStroke() {
         }
         */
 
-        //todo test how to render the path as a bunch of moveTo and lineTos (for calligraphic brush styles)
         var numTraces = this._strokeWidth;
         var halfNumTraces = numTraces/2;
         var deltaDisplacement = [1,0];//[this._strokeWidth/numTraces, 0]; //a horizontal line brush
@@ -371,17 +412,20 @@ function GLBrushStroke() {
             var disp = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
             //ctx.globalCompositeOperation = 'source-over';
             var distFromMiddle = Math.abs(halfNumTraces-t);
-            var alphaVal = 1.0 - (distFromMiddle/halfNumTraces);
+            var alphaVal = 1.0 - (100-this._strokeHardness)*(distFromMiddle/halfNumTraces)/100;
             ctx.save();
             ctx.lineWidth=this._strokeWidth/10;//4;
             if (ctx.lineWidth<2)
                 ctx.lineWidth=2;
+            if (t===numTraces-1){
+                ctx.lineWidth = 1; 
+            }
             ctx.lineJoin="bevel";
             ctx.lineCap="butt";
             if (t<numTraces/2)
                 ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
             else
-                ctx.strokeStyle="rgba("+255+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
+                ctx.strokeStyle="rgba("+parseInt(255*this._secondStrokeColor[0])+","+parseInt(255*this._secondStrokeColor[1])+","+parseInt(255*this._secondStrokeColor[2])+","+alphaVal+")";
             ctx.translate(disp[0],disp[1]);
             ctx.beginPath();
             ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
@@ -437,4 +481,20 @@ function GLBrushStroke() {
         return true;
     }
 
-} //function GLSubpath ...class definition
\ No newline at end of file
+} //function GLBrushStroke ...class definition
+
+GLBrushStroke.prototype._CatmullRomSplineInterpolate = function(ctrlPts, t)
+{
+    //perform CatmullRom interpolation on the spline...assume t is in [0,1]
+    var t2 = t*t;
+    var t3 = t2*t;
+    var retPoint = [0,0,0];
+    for (var i=0;i<3;i++){
+        retPoint[i] = 0.5 *(
+            (2*ctrlPts[1][i]) +
+            (-ctrlPts[0][i] + ctrlPts[2][i]) * t +
+            (2*ctrlPts[0][i] - 5*ctrlPts[1][i] + 4*ctrlPts[2][i] - ctrlPts[3][i]) * t2 +
+            (-ctrlPts[0][i] + 3*ctrlPts[1][i]- 3*ctrlPts[2][i] + ctrlPts[3][i]) * t3);
+    }
+    return retPoint;
+}
\ No newline at end of file
-- 
cgit v1.2.3


From 264e3d8e6d3624083d2fab9fe2560234553bb2ad Mon Sep 17 00:00:00 2001
From: Pushkar Joshi
Date: Tue, 6 Mar 2012 17:03:06 -0800
Subject: draw brush stroke as concentric paths overlaid on top of each
 other...allows us to simulate softness for circular brushes

---
 js/helper-classes/RDGE/GLBrushStroke.js | 135 +++++++++++++++++++++++---------
 1 file changed, 98 insertions(+), 37 deletions(-)

(limited to 'js/helper-classes')

diff --git a/js/helper-classes/RDGE/GLBrushStroke.js b/js/helper-classes/RDGE/GLBrushStroke.js
index c1469977..26c922a3 100755
--- a/js/helper-classes/RDGE/GLBrushStroke.js
+++ b/js/helper-classes/RDGE/GLBrushStroke.js
@@ -81,7 +81,7 @@ function GLBrushStroke() {
         //add the point only if it is some epsilon away from the previous point
         var numPoints = this._Points.length;
         if (numPoints>0) {
-            var threshold = this._WETNESS_FACTOR*this._strokeWidth;
+            var threshold = 1;//this._WETNESS_FACTOR*this._strokeWidth;
             var prevPt = this._Points[numPoints-1];
             var diffPt = [prevPt[0]-pt[0], prevPt[1]-pt[1]];
             var diffPtMag = Math.sqrt(diffPt[0]*diffPt[0] + diffPt[1]*diffPt[1]);
@@ -375,46 +375,58 @@ function GLBrushStroke() {
         */
 
         /*
-        var R2 = this._strokeWidth;
-        var R = R2*0.5;
-        var hardness = 0; //for a pencil, this is always 1 //TODO get hardness parameter from user interface
-        var innerRadius = (hardness*R)-1;
-        if (innerRadius<1)
-            innerRadius=1;
-
-        var r = ctx.createRadialGradient(0,0,innerRadius, 0,0,R);
-        var midColor = "rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+",1)";
-        r.addColorStop(0, midColor);
-        var endColor = "rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+",0.0)";
-        r.addColorStop(1, endColor);
-        ctx.fillStyle = r;
-
-        for (var i = 0; i < numPoints; i++) {
-            var pt = this._Points[i];
-            ctx.globalCompositeOperation = 'source-over';
-            var x = pt[0]-bboxMin[0];
-            var y = pt[1]-bboxMin[1];
-            ctx.save();
-            ctx.translate(x,y);
-            ctx.arc(0, 0, R, 0, 2 * Math.PI, false);
-            ctx.fill();
-            ctx.restore();
-            //ctx.globalCompositeOperation = 'source-in';
-            //ctx.rect(x-R, y-R, R2, R2);
-        }
-        */
-
+        //build the stamp for the brush stroke
+        //todo get this directly from the UI
+        var t=0;
         var numTraces = this._strokeWidth;
         var halfNumTraces = numTraces/2;
-        var deltaDisplacement = [1,0];//[this._strokeWidth/numTraces, 0]; //a horizontal line brush
         var startPos = [-this._strokeWidth/2,0];
-        for (var t=0;t<numTraces;t++){
-            var disp = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
+        var brushStamp = [];
+
+        //build an angled (calligraphic) brush stamp
+        var deltaDisplacement = [1,1];//[this._strokeWidth/numTraces, 0]; //a horizontal line brush
+        for (t=0;t<numTraces;t++){
+            var brushPt = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
+            brushStamp.push(brushPt);
+        }
+
+
+        //make a circular brush stamp
+        brushStamp=[];
+        numTraces = this._strokeWidth*Math.PI; //figure out how to
+        var radius = this._strokeWidth/2;
+        for (t=0;t<numTraces;t++)
+        {
+            var angle = Math.PI*(360*t/numTraces)/180;
+            var brushPt = [radius*Math.cos(angle), radius*Math.sin(angle)];
+            brushStamp.push(brushPt);
+        }
+        
+//        //make a square brush stamp
+//        STOPPED HERE
+//        brushStamp = [];
+//        numTraces = 4*strokeWidth;
+//        for (t=0;t<numTraces;t++){
+//            if (t<numTraces*0.25){
+//                var brushPt = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
+//            } else if (t<numTraces*0.5){
+//
+//            } else if (t<numTraces*0.75){
+//
+//            } else {
+//
+//            }
+//            brushStamp.push(brushPt);
+//        }
+
+        for (t=0;t<numTraces;t++){
+            var disp = [brushStamp[t][0], brushStamp[t][1]];
             //ctx.globalCompositeOperation = 'source-over';
             var distFromMiddle = Math.abs(halfNumTraces-t);
             var alphaVal = 1.0 - (100-this._strokeHardness)*(distFromMiddle/halfNumTraces)/100;
+            alphaVal = 0.2;
             ctx.save();
-            ctx.lineWidth=this._strokeWidth/10;//4;
+            ctx.lineWidth=this._strokeWidth/10;//todo figure out the correct formula for the line width
             if (ctx.lineWidth<2)
                 ctx.lineWidth=2;
             if (t===numTraces-1){
@@ -422,10 +434,10 @@ function GLBrushStroke() {
             }
             ctx.lineJoin="bevel";
             ctx.lineCap="butt";
-            if (t<numTraces/2)
+            //if (t<numTraces/2)
                 ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
-            else
-                ctx.strokeStyle="rgba("+parseInt(255*this._secondStrokeColor[0])+","+parseInt(255*this._secondStrokeColor[1])+","+parseInt(255*this._secondStrokeColor[2])+","+alphaVal+")";
+            //else
+            //    ctx.strokeStyle="rgba("+parseInt(255*this._secondStrokeColor[0])+","+parseInt(255*this._secondStrokeColor[1])+","+parseInt(255*this._secondStrokeColor[2])+","+alphaVal+")";
             ctx.translate(disp[0],disp[1]);
             ctx.beginPath();
             ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
@@ -435,8 +447,10 @@ function GLBrushStroke() {
             ctx.stroke();
             ctx.restore();
         }
+        */
 
         /*
+        //debugging path
         ctx.beginPath();
         ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
         for (var i=1;i<numPoints;i++){
@@ -447,6 +461,53 @@ function GLBrushStroke() {
         ctx.stroke();
         */
 
+        var numlayers = this._strokeWidth/2;
+        var alphaVal = 1.0/(numlayers-1);
+        for (var l=0;l<numlayers;l++){
+            ctx.beginPath();
+            ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
+            for (var i=1;i<numPoints;i++){
+                ctx.lineTo(this._Points[i][0]-bboxMin[0], this._Points[i][1]-bboxMin[1]);
+            }
+            ctx.lineCap = "round";
+            ctx.lineJoin="round";
+            ctx.lineWidth=l+1;
+            ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
+            ctx.stroke();
+        }
+
+        /*
+        var R2 = this._strokeWidth;
+        var R = R2*0.5;
+        var hardness = 0; //for a pencil, this is always 1 //TODO get hardness parameter from user interface
+        var innerRadius = (hardness*R)-1;
+        if (innerRadius<1)
+            innerRadius=1;
+
+        var r = ctx.createRadialGradient(0,0,innerRadius, 0,0,R);
+        var midColor = "rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+",1)";
+        r.addColorStop(0, midColor);
+        var endColor = "rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+",0.0)";
+        r.addColorStop(1, endColor);
+        ctx.fillStyle = r;
+
+        for (var i = 0; i < numPoints; i++) {
+            var pt = this._Points[i];
+            ctx.globalCompositeOperation = 'source-over';
+            var x = pt[0]-bboxMin[0];
+            var y = pt[1]-bboxMin[1];
+            ctx.save();
+            ctx.translate(x,y);
+            ctx.arc(0, 0, R, 0, 2 * Math.PI, false);
+            ctx.fill();
+            ctx.restore();
+            break;
+            //ctx.globalCompositeOperation = 'source-in';
+            //ctx.rect(x-R, y-R, R2, R2);
+        }
+        */
+
+
         ctx.restore();
     } //render()
 
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