Java 對圖片90度旋轉

public BufferedImage rotate90DX(BufferedImage bi)
{
    int width = bi.getWidth();
    int height = bi.getHeight();


BufferedImage biFlip = new BufferedImage(height, width, bi.getType());

for(int i=0; i<width; i++)
    for(int j=0; j<height; j++)
        biFlip.setRGB(height-1-j, width-1-i, bi.getRGB(i, j));

return biFlip;

}
public BufferedImage rotate90SX(BufferedImage bi)
{
    int width = bi.getWidth();
    int height = bi.getHeight();

BufferedImage biFlip = new BufferedImage(height, width, bi.getType());

for(int i=0; i<width; i++)
    for(int j=0; j<height; j++)
        biFlip.setRGB(j, i, bi.getRGB(i, j));

return biFlip;

}</pre>