Silverlight杂记 图片及WriteableBitmap的使用(画分形1)

支持的图片格式

从一个UI中获取为图片

WriteableBitmap bmp = new WriteableBitmap(SP1, null); 
    img3.Source = bmp;

画图

先看效果吧，还是挺漂亮的

private void Draw() { 
          int width = 1024;
          int height = 768;
          int[] colorTable = new int[256];
          for (int i = 0; i < 256; i++) { 
              Color c = Color.FromArgb( 
                  0xFF, (byte)(255 - i), (byte)(255 - i), (byte)(255));
              colorTable[i] = c.A << 24 | c.R << 16 | c.G << 8 | c.B; 
          }
          WriteableBitmap bmp = new WriteableBitmap(width, height);
          for (int x = 0; x < width; x++) { 
              for (int y = 0; y < height; y++) { 
                  double zoom = 300; 
                  double x0 = 0; double y0 = 0; 
                  double cx = (x - width / 2) / zoom; 
                  double cy = (y - height / 2) / zoom;
                  int iteration = 0; 
                  int maxIterations = 1000;
                  while (x0 * x0 + y0 * y0 <= 4 && iteration < maxIterations) { 
                      double xtemp = x0 * x0 - y0 * y0 + cx; 
                      y0 = 2 * x0 * y0 + cy; 
                      x0 = xtemp;
                      iteration++; 
                  }
                  if (iteration == maxIterations) { 
                      bmp.Pixels[(y * width) + x] = 
                                 colorTable[colorTable.GetUpperBound(0)]; 
                  } else { 
                      bmp.Pixels[(y * width) + x] = 
                                 colorTable[iteration % colorTable.Length]; 
                  } 
              } 
          }
          image2.Source = bmp;
      }

WriteableBitmap 扩展阅读：

 http://www.cnblogs.com/webabcd/archive/2009/08/27/1554804.html