我正在尝试在for循环中简单地旋转一张图片,代码如下:
class MyCanvas extends JComponent {
AffineTransform identity = new AffineTransform();
Image arrow;
Double angle = -180.0;
public void spin() {
angle += 10.0;
for(int i = 0; i < 10; i++) {
repaint();
System.out.println(i);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
arrow = Toolkit.getDefaultToolkit().getImage("red-arrow-right-th.png");
// Rotate + translate
AffineTransform trans = new AffineTransform();
trans.setTransform(identity);
trans.translate(getWidth()/2, getHeight()/2);
trans.rotate(Math.toRadians(angle));
System.out.println(trans);
g2.drawImage(arrow, trans, this);
g2.finalize();
}
}
然而,当我在主函数中调用spin()
时,它似乎只应用了一次旋转,但仍然正确地打印出循环。我是否忽略了某些东西?