5 files changed, 212 insertions, 41 deletions

diff --git a/js/lib/drawing/world.js b/js/lib/drawing/world.js
index 3d6c6fc4..04e4d96b 100755
--- a/js/lib/drawing/world.js
+++ b/js/lib/drawing/world.js
@@ -26,7 +26,7 @@ var MaterialsModel = require("js/models/materials-model").MaterialsModel;
 // Class GLWorld
 //      Manages display in a canvas
 ///////////////////////////////////////////////////////////////////////
-var World = function GLWorld( canvas, use3D ) {
+var World = function GLWorld( canvas, use3D, preserveDrawingBuffer ) {
     ///////////////////////////////////////////////////////////////////////
     // Instance variables
     ///////////////////////////////////////////////////////////////////////
@@ -39,7 +39,11 @@ var World = function GLWorld( canvas, use3D ) {
 
     this._canvas = canvas;
         if (this._useWebGL) {
-                this._glContext = canvas.getContext("experimental-webgl");
+        if(preserveDrawingBuffer) {
+            this._glContext = canvas.getContext("experimental-webgl", {preserveDrawingBuffer: true});
+        } else {
+                    this._glContext = canvas.getContext("experimental-webgl");
+        }
     } else {
                 this._2DContext = canvas.getContext( "2d" );
     }
@@ -680,7 +684,7 @@ World.prototype.render = function() {
                 var root = this.getGeomRoot();
                 this.hRender( root );
         } else {
-                g_Engine.setContext( this._canvas.rdgeId );
+                g_Engine.setContext( this._canvas.rdgeid );
                 //this.draw();
                 this.restartRenderLoop();
         }
diff --git a/js/lib/geom/circle.js b/js/lib/geom/circle.js
index dd82a4cc..8f9f54d1 100755
--- a/js/lib/geom/circle.js
+++ b/js/lib/geom/circle.js
@@ -442,16 +442,43 @@ var Circle = function GLCircle() {
                 var bezPts = MathUtils.circularArcToBezier( [0,0,0], [1,0,0], 2.0*Math.PI );
                 if (bezPts) {
                         var n = bezPts.length;
+            var gradient,
+                colors,
+                len,
+                j,
+                position,
+                cs,
+                c;
 
                         // set up the fill style
                         ctx.beginPath();
                         ctx.lineWidth = 0;
                         if (this._fillColor) {
-                                var c = "rgba(" + 255*this._fillColor[0] + "," + 255*this._fillColor[1] + "," + 255*this._fillColor[2] + "," + this._fillColor[3] + ")";  
-                                ctx.fillStyle = c;
-
+                if(this._fillColor.gradientMode) {
+                    if(this._fillColor.gradientMode === "radial") {
+                        gradient = ctx.createRadialGradient(xCtr, yCtr, 0,
+                                                            xCtr, yCtr, Math.max(yScale, xScale));
+                    } else {
+                        gradient = ctx.createLinearGradient(0, this._height/2, this._width, this._height/2);
+                    }
+                    colors = this._fillColor.color;
+
+                    len = colors.length;
+
+                    for(j=0; j<len; j++) {
+                        position = colors[j].position/100;
+                        cs = colors[j].value;
+                        gradient.addColorStop(position, "rgba(" + cs.r + "," + cs.g + "," + cs.b + "," + cs.a + ")");
+                    }
+
+                    ctx.fillStyle = gradient;
+
+                } else {
+                    c = "rgba(" + 255*this._fillColor[0] + "," + 255*this._fillColor[1] + "," + 255*this._fillColor[2] + "," + this._fillColor[3] + ")";
+                    ctx.fillStyle = c;
+                }
                                 // draw the fill
-                                ctx.beginPath();
+//                              ctx.beginPath();
                                 var p = MathUtils.transformPoint( bezPts[0],   mat );
                                 ctx.moveTo( p[0],  p[1] );
                                 var index = 1;
@@ -504,9 +531,29 @@ var Circle = function GLCircle() {
                         ctx.beginPath();
                         ctx.lineWidth   = lineWidth;
                         if (this._strokeColor) {
-                                var c = "rgba(" + 255*this._strokeColor[0] + "," + 255*this._strokeColor[1] + "," + 255*this._strokeColor[2] + "," + this._strokeColor[3] + ")";  
-                                ctx.strokeStyle = c;
-                        
+                if(this._strokeColor.gradientMode) {
+                    if(this._strokeColor.gradientMode === "radial") {
+                        gradient = ctx.createRadialGradient(xCtr, yCtr, Math.min(xScale, yScale),
+                                                            xCtr, yCtr, 0.5*Math.max(this._height, this._width));
+                    } else {
+                        gradient = ctx.createLinearGradient(0, this._height/2, this._width, this._height/2);
+                    }
+                    colors = this._strokeColor.color;
+
+                    len = colors.length;
+
+                    for(j=0; j<len; j++) {
+                        position = colors[j].position/100;
+                        cs = colors[j].value;
+                        gradient.addColorStop(position, "rgba(" + cs.r + "," + cs.g + "," + cs.b + "," + cs.a + ")");
+                    }
+
+                    ctx.strokeStyle = gradient;
+
+                } else {
+                    c = "rgba(" + 255*this._strokeColor[0] + "," + 255*this._strokeColor[1] + "," + 255*this._strokeColor[2] + "," + this._strokeColor[3] + ")";
+                    ctx.strokeStyle = c;
+                }
                                 // draw the stroke
                                 p = MathUtils.transformPoint( bezPts[0],   mat );
                                 ctx.moveTo( p[0],  p[1] );
diff --git a/js/lib/geom/geom-obj.js b/js/lib/geom/geom-obj.js
index c5880843..1ea74475 100755
--- a/js/lib/geom/geom-obj.js
+++ b/js/lib/geom/geom-obj.js
@@ -138,22 +138,61 @@ var GeomObj = function GLGeomObj() {
     // Methods
     ///////////////////////////////////////////////////////////////////////
         this.setMaterialColor = function(c, type) {
-                if (type == "fill") {
-                        this._fillColor = c.slice(0);
+        var i = 0,
+            nMats = 0;
+        if(c.gradientMode) {
+            // Gradient support
+            if (this._materialArray && this._materialTypeArray) {
+                nMats = this._materialArray.length;
+            }
+
+            var stops = [],
+                colors = c.color;
+
+            var len = colors.length;
+            // TODO - Current shaders only support 4 color stops
+            if(len > 4) {
+                len = 4;
+            }
+
+            for(var n=0; n<len; n++) {
+                var position = colors[n].position/100;
+                var cs = colors[n].value;
+                var stop = [cs.r/255, cs.g/255, cs.b/255, cs.a];
+                stops.push(stop);
+
+                if (nMats === this._materialTypeArray.length) {
+                    for (i=0;  i<nMats;  i++) {
+                        if (this._materialTypeArray[i] == type) {
+                            this._materialArray[i].setProperty( "color"+(n+1), stop.slice(0) );
+                            this._materialArray[i].setProperty( "colorStop"+(n+1), position );
+                        }
+                    }
+                }
+            }
+            if (type === "fill") {
+                this._fillColor = c;
+            } else {
+                this._strokeColor = c;
+            }
         } else {
-                        this._strokeColor = c.slice(0);
-        }
+            if (type === "fill") {
+                this._fillColor = c.slice(0);
+            } else {
+                this._strokeColor = c.slice(0);
+            }
 
-                if (this._materialArray && this._materialTypeArray) {
-                        var nMats = this._materialArray.length;
-                        if (nMats === this._materialTypeArray.length) {
-                                for (var i=0;  i<nMats;  i++) {
-                                        if (this._materialTypeArray[i] == type) {
-                                                this._materialArray[i].setProperty( "color", c.slice(0) );
+            if (this._materialArray && this._materialTypeArray) {
+                nMats = this._materialArray.length;
+                if (nMats === this._materialTypeArray.length) {
+                    for (i=0;  i<nMats;  i++) {
+                        if (this._materialTypeArray[i] == type) {
+                            this._materialArray[i].setProperty( "color", c.slice(0) );
+                        }
                     }
-                                }
-                        }
-                }
+                }
+            }
+        }
 
                 var world = this.getWorld();
                 if (world)  {
@@ -171,14 +210,15 @@ var GeomObj = function GLGeomObj() {
 
         if (strokeMaterial) {
             strokeMaterial.init( this.getWorld() );
-            if(this._strokeColor) {
-                strokeMaterial.setProperty("color", this._strokeColor);
-            }
         }
 
         this._materialArray.push( strokeMaterial );
         this._materialTypeArray.push( "stroke" );
 
+        if(this._strokeColor) {
+            this.setStrokeColor(this._strokeColor);
+        }
+
         return strokeMaterial;
     };
 
@@ -192,15 +232,15 @@ var GeomObj = function GLGeomObj() {
 
         if (fillMaterial) {