图像处理之水纹效果

主要思想：

主要是利用三角正弦函数与余弦函数的变换效果，完成对像素的位移变换，产生

水纹效果，因为自然界中的水纹多少都是正弦波或者余弦波的叠加效果。

参数解析：

支持两个输入参数设置，一个是波长，表示像素位移的多少，另外一个是周期

表示正弦或者余弦函数的在像素中的变换周期。

关键程序解析：

计算位移与周期变化代码如下：

xoffset = (int)((double)wave * Math.sin(2.0 * Math.PI * (float)row / period));yoffset = (int)((double)wave * Math.cos(2.0 * Math.PI * (float)col / period));

程序效果：

程序源代码:

package com.gloomyfish.filter.study;import java.awt.image.BufferedImage;public class WaterFilter extends AbstractBufferedImageOp {private double wave;private double period;public WaterFilter() {wave = 25.0;period = 128;}public void setPeriod(double period) {this.period = period;}public void setWave(double nWave) {this.wave = nWave;}@Overridepublic BufferedImage filter(BufferedImage src, BufferedImage dest) {int width = src.getWidth();        int height = src.getHeight();        if ( dest == null )        dest = createCompatibleDestImage( src, null );        int[] inPixels = new int[width*height];        int[] outPixels = new int[width*height];        Point[][] ssPixels = new Point[height][width];        getRGB( src, 0, 0, width, height, inPixels );        int index = 0, index2 = 0;        int xoffset = 0, yoffset = 0;        for(int row=0; row<height; row++) {        for(int col=0; col<width; col++) {                xoffset = (int)((double)wave * Math.sin(2.0 * Math.PI * (float)row / period));                yoffset = (int)((double)wave * Math.cos(2.0 * Math.PI * (float)col / period));                xoffset = xoffset + col;                yoffset = yoffset + row;                if(xoffset < 0 || xoffset >=width) {                xoffset = 0;                }                if(yoffset < 0 || yoffset >=height) {                yoffset = 0;                }                                // save the 2D coordinate newX, and newY                ssPixels[row][col] = new Point(xoffset, yoffset);         }        }                // coordinate 2D result and fill the pixels data.        for(int row=0; row<height; row++) {        int ta = 0, tr = 0, tg = 0, tb = 0;        for(int col=0; col<width; col++) {        index = row * width + col;        index2 = ssPixels[row][col].getRow() * width + ssPixels[row][col].getCol();        ta = (inPixels[index2] >> 24) & 0xff;                tr = (inPixels[index2] >> 16) & 0xff;                tg = (inPixels[index2] >> 8) & 0xff;                tb = inPixels[index2] & 0xff;                outPixels[index] = (ta << 24) | (tr << 16) | (tg << 8) | tb;        }        }        setRGB( dest, 0, 0, width, height, outPixels );        return dest;}class Point {private int x;private int y;public Point(int x, int y) {this.x = x;this.y = y;}public int getRow() {return this.y;}public int getCol() {return this.x;}}}

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