Java旋转图像

问题描述

  @Override 
 public void paintComponent（Graphics g）
 {
 super.paintComponent（g）; 
 Graphics2D g2 =（Graphics2D）g.create（）; 
 
 //播放器旋转
 if（player.newDirection）
 {
 int rotationX = player.getImage（）。getWidth（null）/ 2; 
 int rotationY = player.getImage（）。getHeight（null）/ 2; 
 
 AffineTransform at = new AffineTransform（）; 
 
 
 
 
 if（player.direction == LEFT）
 {
 //graphics.rotate(Math.toRadians(90） ，bufferedImage.getWidth（）/ 2，bufferedImage.getHeight（）/ 2）; 
 //graphics.drawImage（player.getImage（），player.getX（），player.getY（），null）; 
 at.setToRotation（Math.toRadians（45），rotationX，rotationY）; 
 g2.setTransform（at）; 
 g2.drawImage（player.getImage（），player.getX（），player.getY（），null）; 
 g2.dispose（）; 
 System.out.println（sola）; 
} 
  

我想旋转播放器的图像，但它不起作用。问题在哪里？

解决方案

我想我理解您的问题。

为了让事情按预期工作，绘制图像以使图像的中心位于（0，0）处，然后翻译它。

- 翻译图像中心为（0，0）
- 旋转图像
- 将图像翻译回所需点

   @Override
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2=(Graphics2D) g.create();

        //rotation of player
         if(player.newDirection)
         {
             int rotationX=player.getImage().getWidth(null)/2;
             int rotationY=player.getImage().getHeight(null)/2;

             AffineTransform at=new AffineTransform();




                if(player.direction==LEFT)
                {
                    //graphics.rotate(Math.toRadians(90),bufferedImage.getWidth()/2,bufferedImage.getHeight()/2);
                    //graphics.drawImage(player.getImage(), player.getX(), player.getY(), null);
                    at.setToRotation(Math.toRadians(45), rotationX, rotationY);
                    g2.setTransform(at);
                    g2.drawImage(player.getImage(),player.getX(),player.getY(),null);
                    g2.dispose();
                    System.out.println("sola");
                }

I am trying to rotate the image of player but it does not work. Where is the problem?

解决方案

I think I understand your problem.

Rotation are made around the (0, 0) point, so if you print your image in the middle of the screen, it will display very far away from where you'd think.

In order to have things work as expected, draw your image so that the center of the image will be at (0, 0), then translate it.

So you might have to do the transform as so:- Translate so that image center is (0, 0)- Rotate your image- Translate your image back to the required point

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