Java旋转图像 [英] Java Rotate Image

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本文介绍了Java旋转图像的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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。



<旋转是在(0,0)点周围进行的,所以如果您在屏幕中间打印图像,它将显示在离您想象的很远的地方。



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。



<因此,您可能需要进行如下转换:
- 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

这篇关于Java旋转图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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