图片滤镜demo

最近一直在研究图片滤镜。呵呵，也是工作需要啊——搜狗输入法的大头贴四期将加入图片滤镜功能。死了很多脑细胞，不过收获还是蛮多。感谢rakuto

package laan.smart.bitmap
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{
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import flash.display.BitmapData;
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import flash.display.BitmapDataChannel;
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import flash.filters.ColorMatrixFilter;
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import flash.filters.ConvolutionFilter;
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import flash.filters.DisplacementMapFilter;
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import flash.filters.DisplacementMapFilterMode;
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import flash.geom.Point;
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import flash.geom.Rectangle;
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/**
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* 滤镜生成器
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*
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* <p>
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* 用于生成黑白照、水彩、模糊、膨胀、挤压等滤镜。
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* </p>
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*
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* <p>
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* 部分代码源自rakuto:http://code.google.com/p/as3filters/
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* </p>
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*
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* @author laan
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* @createTime 2008.11
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*
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* @see http://www.laaan.cn
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* @see http://code.google.com/p/as3filters/
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*
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*/
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public class FilterFactory
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{
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/**
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* 水彩滤镜
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*
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* @param size 目标对象范围
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* @param region 滤镜作用范围
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* @param factor 接收一个0-1的Number数据，指定水彩化系数
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*
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* @return 返回一个<code>DisplacementMapFilter</code>滤镜
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*
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*/
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public static function aquarelleFilter(size:Rectangle, region:Rectangle = null, factor:Number = 0.5):DisplacementMapFilter {
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if (!region) region = new Rectangle(0, 0, size.width, size.height);
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if (factor > 1) factor = 1;
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if (factor < 0) factor = 0;
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var bd:BitmapData = new BitmapData(size.width, size.height, false, 0x000000);
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var no:BitmapData = new BitmapData(size.width, size.height);
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no.noise(factor * 10, 0, 255, BitmapDataChannel.RED);
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bd.copyPixels(no, region, new Point(region.x, region.y));
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var chanel:uint = BitmapDataChannel.RED;
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var filter:DisplacementMapFilter = new DisplacementMapFilter(bd, new Point(0, 0), chanel, chanel, factor * 5, factor * 5);
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return filter;
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}
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/**
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* 模糊滤镜
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*
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* @param factor 接收一个0-1的Number数据，指定水彩化系数
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*
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* @return 返回一个<code>ConvolutionFilter</code>滤镜
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*
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*/
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public static function FuzzyFilter(factor:Number = 0.5):ConvolutionFilter {
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if (factor > 1) factor = 1;
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if (factor < 0) factor = 0;
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factor *= 10;
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var matrix:Array = [];
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var i:uint = 0;
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while(i++ < factor * factor) {
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matrix.push(1);
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}
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var filter:ConvolutionFilter = new ConvolutionFilter(factor, factor, matrix, factor * factor);
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return filter;
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}
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/**
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* 灰度滤镜
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*
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*
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* @return 返回一个<code>ColorMatrixFilter</code>滤镜
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*
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*/
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public static function grayFilter():ColorMatrixFilter {
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var matrix:Array = [0, 1, 0, 0, 0,
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0, 1, 0, 0, 0,
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0, 1, 0, 0, 0,
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0, 0, 0, 1, 0];
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return new ColorMatrixFilter(matrix);
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}
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/**
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* 浮雕滤镜
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*
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* @return 返回一个<code>ConvolutionFilter</code>滤镜
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*
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*/
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public static function reliefFilter():ConvolutionFilter {
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var matrix:Array = [-2,-1,0,-1,1,1,0,1,2];
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var filter:ConvolutionFilter = new ConvolutionFilter(3, 3, matrix, 1);
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return filter;
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}
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/**
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* 木雕滤镜
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*
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* @param factor 0-1
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*
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* @return 返回一组滤镜
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*
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*/
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public static function woodCarvingFilter(factor:Number = 0.5):Array {
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if (factor > 1) factor = 1;
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if (factor < 0) factor = 0;
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factor *= 10;
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var matrix:Array = [0, 1, 0, 0, -127,
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0, 1, 0, 0, -127,
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0, 1, 0, 0, -127,
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0, 0, 0, 1, 0];
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var matrix2:Array = [0, factor, 0, 0, 0,
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0, factor, 0, 0, 0,
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0, factor, 0, 0, 0,
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0, 0, 0, 1, 0];
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return [new ColorMatrixFilter(matrix), new ColorMatrixFilter(matrix2)];
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}
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/**
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* 扭曲滤镜
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*
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* @param size
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* @param region
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* @param rotation
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*
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* @return
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*
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*/
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public static function twirlFilter(size:Rectangle, region:Rectangle=null, rotation:Number=0):DisplacementMapFilter {
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if (!region) region = new Rectangle(0, 0, size.width, size.height);
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rotation ||= Math.PI / 2;
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var width:int = size.width;
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var height:int = size.height;
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var dbmd:BitmapData = new BitmapData(size.width, size.height, false, 0x8080);
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var radius:Number = Math.min(region.width, region.height) / 2;
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var centerX:int = region.x + region.width / 2;
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var centerY:int = region.y + region.height / 2;
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for(var y:int = 0; y < height; ++y) {
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var ycoord:int = y - centerY;
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for(var x:int = 0; x < width; ++x) {
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var xcoord:int = x - centerX;
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var dr:Number = radius - Math.sqrt(xcoord * xcoord + ycoord * ycoord);
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if(dr > 0) {
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var angle:Number = dr / radius * rotation;
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var dx:Number = xcoord * Math.cos(angle) - ycoord * Math.sin(angle) - xcoord;
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var dy:Number = xcoord * Math.sin(angle) + ycoord * Math.cos(angle) - ycoord;
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var blue:int = 0x80 + Math.round(dx / width * 0xff);
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var green:int = 0x80 + Math.round(dy / height * 0xff);
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dbmd.setPixel(x, y, green << 8 | blue);
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}
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}
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}
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return new DisplacementMapFilter(dbmd,
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new Point(0, 0),
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BitmapDataChannel.BLUE,
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BitmapDataChannel.GREEN,
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width,
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height,
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DisplacementMapFilterMode.IGNORE);
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}
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/**
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* 挤压滤镜
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*
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* @param size
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* @param region
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* @param amount
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* @return
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*
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*/
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public static function squeezeFilter(size:Rectangle, region:Rectangle = null, factor:Number = 0.5):DisplacementMapFilter {
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var width:int = size.width;
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var height:int = size.height;
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region ||= new Rectangle(0, 0, width, height);
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var radius:Number = Math.min(region.width, region.height) / 2;
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var centerX:int = region.x + region.width / 2;
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var centerY:int = region.y + region.height / 2;
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var dbmd:BitmapData = new BitmapData(width, height, false, 0x8080);
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for(var y:int = 0; y < height; ++y) {
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var ycoord:int = y - centerY;
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for(var x:int = 0; x < width; ++x) {
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var xcoord:int = x - centerX;
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var d:Number = Math.sqrt(xcoord * xcoord + ycoord * ycoord);
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if(d < radius) {
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var t:Number = d == 0 ? 0 : Math.pow(Math.sin(Math.PI / 2 * d / radius), -factor);
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var dx:Number = xcoord * (t - 1) / width;
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var dy:Number = ycoord * (t - 1) / height;
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var blue:int = 0x80 + dx * 0xff;
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var green:int = 0x80 + dy * 0xff;
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dbmd.setPixel(x, y, green << 8 | blue);
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}
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}
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}
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return new DisplacementMapFilter(dbmd,
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new Point(0, 0),
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BitmapDataChannel.BLUE,
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BitmapDataChannel.GREEN,
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width,
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height,
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DisplacementMapFilterMode.CLAMP);
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}
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/**
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* 膨胀滤镜
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*
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* @param size
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* @param region
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* @param factor
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*
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* @return
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*
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*/
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public static function bulgeFilter(size:Rectangle, region:Rectangle = null, factor:Number = 0.5):DisplacementMapFilter {
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return squeezeFilter(size, region, Math.min(-factor, -1));
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}
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/**
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* 鱼眼滤镜
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*
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* @param size
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* @param region
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* @param factor
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*
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* @return
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*
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*/
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public static function fisheyeFilter(size:Rectangle, region:Rectangle = null, factor:Number = 0.8):DisplacementMapFilter {
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var width:int = size.width;
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var height:int = size.height;
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region ||= new Rectangle(0, 0, width, height);
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var dbmd:BitmapData = new BitmapData(width, height, false, 0x8080);
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var centerX:int = region.x + region.width / 2;
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var centerY:int = region.y + region.height / 2;
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var radius:Number = Math.sqrt(region.width * region.width + region.height * region.height);
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for(var y:int = 0; y < height; ++y) {
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var ycoord:int = y - centerY;
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for(var x:int = 0; x < width; ++x) {
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var xcoord:int = x - centerX;
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var d:Number = Math.sqrt(xcoord * xcoord + ycoord * ycoord);
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if(d < radius) {
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var t:Number = d == 0 ? 0 : Math.pow(Math.sin(Math.PI / 2 * d / radius), factor);
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var dx:Number = xcoord * (t - 1) / width;
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var dy:Number = ycoord * (t - 1) / height;
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var blue:int = 0x80 + dx * 0xff;
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var green:int = 0x80 + dy * 0xff;
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dbmd.setPixel(x, y, green << 8 | blue);
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}
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}
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}
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return new DisplacementMapFilter(dbmd,
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new Point(0, 0),
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BitmapDataChannel.BLUE,
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BitmapDataChannel.GREEN,
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width,
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height,
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DisplacementMapFilterMode.CLAMP);
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}
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}
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}

posted @ 2009-06-25 15:10 laan 阅读(3023) 评论(18) 收藏举报

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