BufferedImage rotate(Image src, src_width = src.getWidth( src_height = src.getHeight(
Rectangle rect_des = CalcRotatedSize( Rectangle(= = =
g2.translate((rect_des.width - src_width) / 2, (rect_des.height - src_height) / 2);
g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);
,
Rectangle CalcRotatedSize(Rectangle src, cos = sin = des_width = ()(src.width * cos) + ()(src.height * des_height = ()(src.height * cos) + ()(src.width * java.awt.Rectangle(
1.先平移再旋轉