Wave滤镜

Wave Filter水波滤镜 水波滤镜是通过坐标变换来模拟水波效果，使图像呈现出水波的特效。这个滤镜有一个可调参数：水波的扭曲程度。 代码如下; ~~~ /// Wave Filter /// /// Source image. /// The degree of wave,0-100. /// The result image. private Bitmap WaveFilterProcess(Bitmap srcBitmap, int degree) { Bitmap a = new Bitmap(srcBitmap); int w = a.Width; int h = a.Height; degree = degree * 32 / 100; degree = Math.Max(0, Math.Min(32, degree)); Bitmap dst = new Bitmap(w, h); System.Drawing.Imaging.BitmapData srcData = a.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb); System.Drawing.Imaging.BitmapData dstData = dst.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb); unsafe { byte* pIn = (byte*)srcData.Scan0.ToPointer(); byte* pOut = (byte*)dstData.Scan0.ToPointer(); byte* p = null; int stride = srcData.Stride - w * 4; int newX = 0, newY = 0; double PI2 = Math.PI * 2.0; for (int y = 0; y < h; y++) { for (int x = 0; x < w; x++) { newX = (int)(degree * Math.Sin(PI2 * y / 128.0)) + x; newY = (int)(degree * Math.Cos(PI2 * x / 128.0)) + y; newX = Math.Min(w - 1, Math.Max(0, newX)); newY = Math.Min(h - 1, Math.Max(0, newY)); p = pIn + newY * srcData.Stride + newX * 4; pOut[0] = (byte)p[0]; pOut[1] = (byte)p[1]; pOut[2] = (byte)p[2]; pOut[3] = (byte)255; pOut += 4; } pOut += stride; } a.UnlockBits(srcData); dst.UnlockBits(dstData); } return dst; } ~~~ 效果图如下： [](http://www.zealpixel.com/data/attachment/portal/201507/22/180109cnnki2ihzwsbo08b.jpg) 原图 [](http://www.zealpixel.com/data/attachment/portal/201507/22/180108r10lxojc94k8l4cc.png) 水波滤镜效果图 最后放上一个完整的C#版程序Demo下载地址：http://www.zealpixel.com/thread-59-1-1.html