Added color filters

Gruntfile.js

@@ -39,7 +39,8 @@ module.exports = function(grunt) {
     'src/filters/Brighten.js', 
     'src/filters/Invert.js', 
     'src/filters/Blur.js', 
-    'src/filters/Mask.js'
+    'src/filters/Mask.js',
+    'src/filters/Colors.js'
   ];
 
   var unitTestFiles = [

src/filters/Colors.js

@@ -0,0 +1,163 @@
+(function() {
+
+    function pixelShiftHue(r,g,b,deg){
+
+        // Input colors are in 0-255, calculations are between 0-1
+        r /= 255; g /= 255; b /= 255;
+
+        // http://en.wikipedia.org/wiki/HSL_and_HSV
+        // Convert to HSL
+        var max = Math.max(r,g,b),
+            min = Math.min(r,g,b),
+            chroma = max - min,
+            luminance = chroma / 2,
+            saturation = chroma / (1 - Math.abs(2*luminance-1)),
+            hue = 0;
+        
+        if( max == r ){ hue = ((g-b)/chroma) % 6; }else
+        if( max == g ){ hue =  (b-r)/chroma  + 2; }else
+        if( max == b ){ hue =  (r-g)/chroma  + 4; }
+        
+        hue *= 60;
+        hue %= 360;
+            
+        // Shift hue
+        hue += deg;
+        hue %= 360;
+        //hue /= 360;
+            
+        // hsl to rgb:
+        hue /= 60;
+        var rR = 0, rG = 0, rB = 0,
+            //chroma = saturation*(1 - Math.abs(2*luminance - 1)),
+            tmp = chroma * (1-Math.abs(hue % 2 - 1)),
+            m = luminance - chroma/2;
+            
+        if( 0 <= hue && hue < 1 ){ rR = chroma; rG = tmp; }else
+        if( 1 <= hue && hue < 2 ){ rG = chroma; rR = tmp; }else
+        if( 2 <= hue && hue < 3 ){ rG = chroma; rB = tmp; }else
+        if( 3 <= hue && hue < 4 ){ rB = chroma; rG = tmp; }else
+        if( 4 <= hue && hue < 5 ){ rB = chroma; rR = tmp; }else
+        if( 5 <= hue && hue < 6 ){ rR = chroma; rB = tmp; }
+            
+        rR += m; rG += m; rB += m;
+        rR = (255*rR);
+        rG = (255*rG);
+        rB = (255*rB);
+        
+        return [rR,rG,rB];
+    }
+
+    /**
+     * shift hue
+     * @function
+     * @memberof Kinetic.Filters
+     * @param {Object} imageData
+     */
+    Kinetic.Filters.ShiftHue = function(imageData) {
+        var data = imageData.data, pixel;
+        for(var i = 0; i < data.length; i += 4) {
+            pixel = pixelShiftHue(data[i+0],data[i+1],data[i+2],deg);
+            data[i+0] = pixel[0];
+            data[i+1] = pixel[1];
+            data[i+2] = pixel[2];
+        }
+    };
+
+    Kinetic.Node.addFilterGetterSetter(Kinetic.Image, 'filterHueShiftDeg', 0);
+    /**
+     * get hue shift amount.  The shift amount is a number between 0 and 360.
+     * @name getFilterBrightness
+     * @method
+     * @memberof Kinetic.Image.prototype
+     */
+
+    /**
+     * set hue shift amount
+     * @name setFilterBrightness
+     * @method
+     * @memberof Kinetic.Image.prototype
+     */
+
+    /**
+     * show only red
+     * @function
+     * @memberof Kinetic.Filters
+     * @param {Object} imageData
+     */
+    Kinetic.Filters.OnlyRed = function(imageData) {
+        var data = imageData.data;
+        for(var i = 0; i < data.length; i += 4) {
+            data[i + 1] = 0; // green
+            data[i + 2] = 0; // blue
+        }
+    };
+
+    /**
+     * show only green
+     * @function
+     * @memberof Kinetic.Filters
+     * @param {Object} imageData
+     */
+    Kinetic.Filters.OnlyGreen = function(imageData) {
+        var data = imageData.data;
+        for(var i = 0; i < data.length; i += 4) {
+            data[i + 0] = 0; // red
+            data[i + 2] = 0; // blue
+        }
+    };
+
+    /**
+     * show only blue
+     * @function
+     * @memberof Kinetic.Filters
+     * @param {Object} imageData
+     */
+    Kinetic.Filters.OnlyGreen = function(imageData) {
+        var data = imageData.data;
+        for(var i = 0; i < data.length; i += 4) {
+            data[i + 0] = 0; // red
+            data[i + 1] = 0; // green
+        }
+    };
+
+    /**
+     * removes all red from an image
+     * @function
+     * @memberof Kinetic.Filters
+     * @param {Object} imageData
+     */
+    Kinetic.Filters.NoRed = function(imageData) {
+        var data = imageData.data;
+        for(var i = 0; i < data.length; i += 4) {
+            data[i + 0] = 0;
+        }
+    };
+
+    /**
+     * removes all green from an image
+     * @function
+     * @memberof Kinetic.Filters
+     * @param {Object} imageData
+     */
+    Kinetic.Filters.NoGreen = function(imageData) {
+        var data = imageData.data;
+        for(var i = 0; i < data.length; i += 4) {
+            data[i + 1] = 0;
+        }
+    };
+
+    /**
+     * removes all blue from an image
+     * @function
+     * @memberof Kinetic.Filters
+     * @param {Object} imageData
+     */
+    Kinetic.Filters.NoBlue = function(imageData) {
+        var data = imageData.data;
+        for(var i = 0; i < data.length; i += 4) {
+            data[i + 2] = 0;
+        }
+    };
+
+})();