Radial gradients to match CSS

2 files changed, 46 insertions, 1 deletions

diff --git a/js/lib/rdge/materials/material.js b/js/lib/rdge/materials/material.js
index 276c7687..b96768b3 100755
--- a/js/lib/rdge/materials/material.js
+++ b/js/lib/rdge/materials/material.js
@@ -228,6 +228,10 @@ var Material = function GLMaterial( world ) {
                 // animated materials should implement the update method
         };
 
+        this.fitToPrimitive = function( prim )  {
+                // some materials need to preserve an aspect ratio - or someting else.
+        };
+
         this.registerTexture = function( texture ) {
                 // the world needs to know about the texture map
                 var world = this.getWorld();
diff --git a/js/lib/rdge/materials/radial-gradient-material.js b/js/lib/rdge/materials/radial-gradient-material.js
index dd40d31d..a671ee42 100755
--- a/js/lib/rdge/materials/radial-gradient-material.js
+++ b/js/lib/rdge/materials/radial-gradient-material.js
@@ -6,6 +6,7 @@ No rights, expressed or implied, whatsoever to this software are provided by Mot
 
 var MaterialParser = require("js/lib/rdge/materials/material-parser").MaterialParser;
 var Material = require("js/lib/rdge/materials/material").Material;
+var ShapePrimitive = require("js/lib/geom/shape-primitive").ShapePrimitive;
 
 var RadialGradientMaterial = function RadialGradientMaterial() {
     ///////////////////////////////////////////////////////////////////////
@@ -24,6 +25,9 @@ var RadialGradientMaterial = function RadialGradientMaterial() {
     this._colorStop4 = 1.0;
     //  this._colorCount        = 4;
 
+        var s = Math.sqrt( 2.0 );
+        this._textureTransform = [s,0,0, 0,s,0, 0,0,1];
+
     ///////////////////////////////////////////////////////////////////////
     // Property Accessors
     ///////////////////////////////////////////////////////////////////////
@@ -231,9 +235,45 @@ var RadialGradientMaterial = function RadialGradientMaterial() {
             this._shader['default'].u_colorStop3.set([s]);
             s = this.getColorStop4();
             this._shader['default'].u_colorStop4.set([s]);
+
+                        this._shader['default'].u_texTransform.set( this._textureTransform );
         }
     };
 
+        this.fitToPrimitive = function( prim )
+        {
+                var bounds = ShapePrimitive.getBounds( prim );
+                if (bounds)
+                {
+                        var dx = Math.abs( bounds[3] - bounds[0] ),
+                                dy = Math.abs( bounds[4] - bounds[1] );
+                        if (dy == 0)  dy = 1.0;
+                        if (dx == 0)  dx = 1.0;
+                        var xScale = 2.0, yScale = 2.0;
+                        if (dx > dy)
+                                yScale *= dy/dx;
+                        else
+                                xScale *= dx/dy;
+
+                        // build the matrix - the translation to the origin, the scale,
+                        // and the translation back to the center (hard coded at (0.5, 0.5) for now).
+                        // the matrix is build directly instead of with matrix multiplications
+                        // for efficiency, not to mention that the multiplication function does
+                        // not exist for mat3's.
+                        // the matrix as laid out below looks transposed - order is columnwise.
+                        var xCtr = 0.5,  yCtr = 0.5;
+                        this._textureTransform = [
+                                                                                                         xScale,                0.0,  0.0,
+                                                                                                                0.0,             yScale,  0.0,
+                                                                                        xCtr*(1-xScale),  yCtr*(1 - yScale),  1.0
+                                                                        ];
+                        
+                        if (this._shader && this._shader['default'])
+                                this._shader['default'].u_texTransform.set( this._textureTransform );   
+
+                }
+        };
+
     this.exportJSON = function () {
         var jObj =
                 {
@@ -316,7 +356,8 @@ var radialGradientMaterialDef =
                                     'u_colorStop1': { 'type': 'float' },
                                     'u_colorStop2': { 'type': 'float' },
                                     'u_colorStop3': { 'type': 'float' },
-                                    'u_colorStop4': { 'type': 'float' }
+                                    'u_colorStop4': { 'type': 'float' },
+                                        'u_texTransform': { 'type' : 'mat3' }
                                     //'u_colorCount':           {'type' : 'int' }
                                 },