From ea195af100d327aac68ada28387fe8259d0f31f4 Mon Sep 17 00:00:00 2001
From: Pushkar Joshi
Date: Wed, 6 Jun 2012 09:46:15 -0700
Subject: added gradients to pen path runtime

---
 assets/canvas-runtime.js | 46 +++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 41 insertions(+), 5 deletions(-)

(limited to 'assets')

diff --git a/assets/canvas-runtime.js b/assets/canvas-runtime.js
index 3ed7ed0f..4fb0a327 100644
--- a/assets/canvas-runtime.js
+++ b/assets/canvas-runtime.js
@@ -1951,6 +1951,40 @@ NinjaCvsRt.RuntimeSubPath = Object.create(NinjaCvsRt.RuntimeGeomObj, {
         }
     },
 
+    //buildColor returns the fillStyle or strokeStyle for the Canvas 2D context
+    buildColor: {
+        value: function(ctx,   //the 2D rendering context (for creating gradients if necessary)
+                 ipColor,      //color string, also encodes whether there's a gradient and of what type
+                 w,            //width of the region of color
+                 h,            //height of the region of color
+                 lw)           //linewidth (i.e. stroke width/size)
+        {
+            if (ipColor.gradientMode){
+                var position, gradient, cs, inset; //vars used in gradient calculations
+                inset = Math.ceil( lw ) - 0.5;
+
+                if(ipColor.gradientMode === "radial") {
+                    var ww = w - 2*lw,  hh = h - 2*lw;
+                    gradient = ctx.createRadialGradient(w/2, h/2, 0, w/2, h/2, Math.max(ww, hh)/2);
+                } else {
+                    gradient = ctx.createLinearGradient(inset, h/2, w-inset, h/2);
+                }
+                var colors = ipColor.color;
+
+                var len = colors.length;
+                for(n=0; n<len; n++) {
+                    position = colors[n].position/100;
+                    cs = colors[n].value;
+                    gradient.addColorStop(position, "rgba(" + cs.r + "," + cs.g + "," + cs.b + "," + cs.a + ")");
+                }
+                return gradient;
+            } else {
+                var c = "rgba(" + 255*ipColor[0] + "," + 255*ipColor[1] + "," + 255*ipColor[2] + "," + ipColor[3] + ")";
+                return c;
+            }
+        }
+    },
+
     render: {
         value: function() {
             // get the world
@@ -1967,18 +2001,19 @@ NinjaCvsRt.RuntimeSubPath = Object.create(NinjaCvsRt.RuntimeGeomObj, {
                 return;
             }
 
+            //vars used for the gradient computation in buildColor
+            var w = world.getViewportWidth(), h = world.getViewportHeight();
+
             ctx.save();
             ctx.lineWidth = this._strokeWidth;
             ctx.strokeStyle = "black";
             if (this._strokeColor) {
-                var strokeColorStr = "rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+this._strokeColor[3]+")";
-                ctx.strokeStyle = strokeColorStr;
+                ctx.strokeStyle = this.buildColor(ctx, this._strokeColor, w,h, this._strokeWidth);
             }
 
             ctx.fillStyle = "white";
             if (this._fillColor){
-                var fillColorStr = "rgba("+parseInt(255*this._fillColor[0])+","+parseInt(255*this._fillColor[1])+","+parseInt(255*this._fillColor[2])+","+this._fillColor[3]+")";
-                ctx.fillStyle = fillColorStr;
+                ctx.fillStyle = this.buildColor(ctx, this._fillColor, w,h, this._strokeWidth);
             }
             var lineCap = ['butt','round','square'];
             ctx.lineCap = lineCap[1];
@@ -2006,7 +2041,8 @@ NinjaCvsRt.RuntimeSubPath = Object.create(NinjaCvsRt.RuntimeGeomObj, {
             ctx.restore();
         }
     }
-});// **************************************************************************
+});
+// **************************************************************************
 // END runtime for the pen tool path
 // **************************************************************************
 
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