Improved 'colorizing' - now any color

src/filters/Colors.js

@@ -1,6 +1,26 @@
 (function() {
 
-    function pixelShiftHue(r,g,b,deg){
+    var rgb_to_hsl = function(r,g,b){
+        // 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; }
+
+        return [(hue*60+360) % 360, saturation, luminance];
+    };
+
+    var pixelShiftHue = function(r,g,b,deg){
 
         // Input colors are in 0-255, calculations are between 0-1
         r /= 255; g /= 255; b /= 255;
@@ -46,7 +66,18 @@
         rB = (255*rB);
         
         return [rR,rG,rB];
+    };
+
+    var shift_hue = function(imageData,deg){
+        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];
         }
+    };
 
     /**
      * shift hue
@@ -55,15 +86,7 @@
      * @param {Object} imageData
      */
     Kinetic.Filters.ShiftHue = function(imageData) {
-        var data = imageData.data,
-            deg = this.getFilterHueShiftDeg(),
-            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];
-        }
+        shift_hue(imageData,this.getFilterHueShiftDeg());
     };
 
     Kinetic.Node.addFilterGetterSetter(Kinetic.Image, 'filterHueShiftDeg', 0);
@@ -81,85 +104,39 @@
      * @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.OnlyBlue = function(imageData) {
+    Kinetic.Filters.Colorize = 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;
-        }
-    };
+        // First we'll colorize it red, then shift by the hue specified
+        var color = this.getFilterColorizeColor(),
+            hsl = rgb_to_hsl(color[0],color[1],color[2]),
+            hue = hsl[0];
 
-    /**
-     * removes all green from an image
-     * @function
-     * @memberof Kinetic.Filters
-     * @param {Object} imageData
-     */
-    Kinetic.Filters.NoGreen = function(imageData) {
-        var data = imageData.data;
+        // Color it red
         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;
         }
+
+        // Shift by the hue
+        shift_hue(imageData,hue);
     };
 
+    Kinetic.Node.addFilterGetterSetter(Kinetic.Image, 'filterColorizeColor', [255,0,0] );
+    /**
+     * Gets the colorizing color.
+     * @name getFilterColorizeColor
+     * @method
+     * @memberof Kinetic.Image.prototype
+     */
+
+    /**
+     * Gets the colorizing color. Should be an array [r,g,b] ie [255,0,128].
+     * @name setFilterColorizeColor
+     * @method
+     * @memberof Kinetic.Image.prototype
+     */
+
 })();

tests/js/visualTests.js

@@ -1432,7 +1432,7 @@ Test.Modules.IMAGE = {
         };
         imageObj.src = '../assets/darth-vader.jpg';
     },
-    'no red filter': function(containerId) {
+    'colorizing filter': function(containerId) {
         var imageObj = new Image();
         imageObj.onload = function() {
             var stage = new Kinetic.Stage({
@@ -1451,146 +1451,12 @@ Test.Modules.IMAGE = {
             layer.add(darth);
             stage.add(layer);
 
-            darth.setFilter(Kinetic.Filters.NoRed);
+            darth.setFilter(Kinetic.Filters.Colorize);
+            darth.setFilterColorizeColor([255,0,128]);
             layer.draw();
             var dataUrl = layer.toDataURL();
             //console.log(dataUrl);
-            testDataUrl(dataUrl, 'blur filter', 'problem with Blur filter.');
-        };
-        imageObj.src = '../assets/darth-vader.jpg';
-    },
-    'no green filter': function(containerId) {
-        var imageObj = new Image();
-        imageObj.onload = function() {
-            var stage = new Kinetic.Stage({
-                container: containerId,
-                width: 578,
-                height: 200
-            });
-            var layer = new Kinetic.Layer();
-            darth = new Kinetic.Image({
-                x: 10,
-                y: 10,
-                image: imageObj,
-                draggable: true
-            });
-
-            layer.add(darth);
-            stage.add(layer);
-
-            darth.setFilter(Kinetic.Filters.NoGreen);
-            layer.draw();
-            var dataUrl = layer.toDataURL();
-            //console.log(dataUrl);
-            testDataUrl(dataUrl, 'blur filter', 'problem with Blur filter.');
-        };
-        imageObj.src = '../assets/darth-vader.jpg';
-    },
-    'no blue filter': function(containerId) {
-        var imageObj = new Image();
-        imageObj.onload = function() {
-            var stage = new Kinetic.Stage({
-                container: containerId,
-                width: 578,
-                height: 200
-            });
-            var layer = new Kinetic.Layer();
-            darth = new Kinetic.Image({
-                x: 10,
-                y: 10,
-                image: imageObj,
-                draggable: true
-            });
-
-            layer.add(darth);
-            stage.add(layer);
-
-            darth.setFilter(Kinetic.Filters.NoBlue);
-            layer.draw();
-            var dataUrl = layer.toDataURL();
-            //console.log(dataUrl);
-            testDataUrl(dataUrl, 'blur filter', 'problem with Blur filter.');
-        };
-        imageObj.src = '../assets/darth-vader.jpg';
-    },
-    'only red filter': function(containerId) {
-        var imageObj = new Image();
-        imageObj.onload = function() {
-            var stage = new Kinetic.Stage({
-                container: containerId,
-                width: 578,
-                height: 200
-            });
-            var layer = new Kinetic.Layer();
-            darth = new Kinetic.Image({
-                x: 10,
-                y: 10,
-                image: imageObj,
-                draggable: true
-            });
-
-            layer.add(darth);
-            stage.add(layer);
-
-            darth.setFilter(Kinetic.Filters.OnlyRed);
-            layer.draw();
-            var dataUrl = layer.toDataURL();
-            //console.log(dataUrl);
-            testDataUrl(dataUrl, 'blur filter', 'problem with Blur filter.');
-        };
-        imageObj.src = '../assets/darth-vader.jpg';
-    },
-    'only green filter': function(containerId) {
-        var imageObj = new Image();
-        imageObj.onload = function() {
-            var stage = new Kinetic.Stage({
-                container: containerId,
-                width: 578,
-                height: 200
-            });
-            var layer = new Kinetic.Layer();
-            darth = new Kinetic.Image({
-                x: 10,
-                y: 10,
-                image: imageObj,
-                draggable: true
-            });
-
-            layer.add(darth);
-            stage.add(layer);
-
-            darth.setFilter(Kinetic.Filters.OnlyGreen);
-            layer.draw();
-            var dataUrl = layer.toDataURL();
-            //console.log(dataUrl);
-            testDataUrl(dataUrl, 'blur filter', 'problem with Blur filter.');
-        };
-        imageObj.src = '../assets/darth-vader.jpg';
-    },
-    'only blue filter': function(containerId) {
-        var imageObj = new Image();
-        imageObj.onload = function() {
-            var stage = new Kinetic.Stage({
-                container: containerId,
-                width: 578,
-                height: 200
-            });
-            var layer = new Kinetic.Layer();
-            darth = new Kinetic.Image({
-                x: 10,
-                y: 10,
-                image: imageObj,
-                draggable: true
-            });
-
-            layer.add(darth);
-            stage.add(layer);
-
-            darth.setFilter(Kinetic.Filters.OnlyBlue);
-            layer.draw();
-            var dataUrl = layer.toDataURL();
-            //console.log(dataUrl);
-            testDataUrl(dataUrl, 'blur filter', 'problem with Blur filter.');
+            testDataUrl(dataUrl, 'colorizing filter', 'problem with colorizing filter.');
         };
         imageObj.src = '../assets/darth-vader.jpg';
     },
@@ -1618,7 +1484,7 @@ Test.Modules.IMAGE = {
             layer.draw();
             var dataUrl = layer.toDataURL();
             //console.log(dataUrl);
-            testDataUrl(dataUrl, 'blur filter', 'problem with Blur filter.');
+            testDataUrl(dataUrl, 'shift hue filter', 'problem with hue shifting filter.');
         };
         imageObj.src = '../assets/lion.png';
     },