您需要同时旋转和平移,使旋转中心为图像的中心。 AffineTransform 旋转方法对此有一个重载,Graphics2D 旋转方法也是如此。例如,如果你尝试...
private Image rotate(double degs){
ImageIcon img = new ImageIcon("src/inc/img/char_male.png"); // why an ImageIcon???
Image temp = new BufferedImage(img.getIconWidth(), img.getIconHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) temp.getGraphics();
g2.rotate(Math.toRadians(degs), img.getIconWidth()/2, img.getIconHeight()/2); // changed
g2.drawImage(img.getImage(), 0, 0, Color.WHITE, null);
System.out.println("Rotating "+degs);
g2.dispose();
return temp;
}
抱歉,这是更正后的代码:
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
public class ImageRotate {
private static final String IMAGE_PATH = "src/yr2011/images/guitar_3406632_n.jpg";
public static void main(String[] args) {
try {
BufferedImage image = ImageIO.read(new File(IMAGE_PATH));
ImageIcon icon = new ImageIcon(image);
JOptionPane.showMessageDialog(null, new JLabel(icon));
icon = new ImageIcon(rotate(image, 90));
JOptionPane.showMessageDialog(null, new JLabel(icon));
} catch (IOException e) {
e.printStackTrace();
}
}
private static Image rotate(Image image, double degs) {
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage temp = new BufferedImage(height, width, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = temp.createGraphics();
g2.rotate(Math.toRadians(degs), height / 2, height / 2);
g2.drawImage(image, 0, 0, Color.WHITE, null);
g2.dispose();
return temp;
}
}