这个问题在这里已经有一个答案：>
Java: Rotating Images2
我设法将图像旋转180度,但希望顺时针旋转90度,有人可以编辑我的代码,以便进行解释.谢谢.
我设法将图像旋转180度,但希望顺时针旋转90度,有人可以编辑我的代码,以便进行解释.谢谢.
private void rotateClockwise()
{
if(currentImage != null){
int width = currentImage.getWidth();
int height = currentImage.getHeight();
OFImage newImage = new OFImage(width,height);
for(int y = 0; y < height; y++) {
for(int x = 0; x < width; x++) {
newImage.setPixel( x,height-y-1,currentImage.getPixel(x,y));
}
}
currentImage = newImage;
imagePanel.setImage(currentImage);
frame.pack();
}
}
解决方法
使用此方法.
/**
* Rotates an image. Actually rotates a new copy of the image.
*
* @param img The image to be rotated
* @param angle The angle in degrees
* @return The rotated image
*/
public static Image rotate(Image img,double angle)
{
double sin = Math.abs(Math.sin(Math.toRadians(angle))),cos = Math.abs(Math.cos(Math.toRadians(angle)));
int w = img.getWidth(null),h = img.getHeight(null);
int neww = (int) Math.floor(w*cos + h*sin),newh = (int) Math.floor(h*cos + w*sin);
BufferedImage bimg = toBufferedImage(getEmptyImage(neww,newh));
Graphics2D g = bimg.createGraphics();
g.translate((neww-w)/2,(newh-h)/2);
g.rotate(Math.toRadians(angle),w/2,h/2);
g.drawRenderedImage(toBufferedImage(img),null);
g.dispose();
return toImage(bimg);
}
取自我的ImageTool课.
希望有帮助
