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; 	}  	@Override 	public 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=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> 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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