像在Java中旋转硬币一样旋转图像

Question

我如何旋转图像，就像在Java中旋转桌面时硬币会旋转一样？

正如this Gif。

我已经尝试使用AffineTransform剪切。它不会给我我想要的输出。

• http://puu.sh/48IHR.png剪绒
• http://puu.sh/48IJx.png原始

你可以从两个图像看到，剪样通过使其更大，而不是仅仅旋转图像扭曲的图像。

Answer 1

警告：你不是曾经打算让你显示同样的结果，但你可以伪造它

基本上，这个例子简单的尺度x轴从-1到1，然后再返回。 ..

import java.awt.BorderLayout; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.awt.geom.AffineTransform; 
import java.awt.image.BufferedImage; 
import java.io.File; 
import java.io.IOException; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.imageio.ImageIO; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.Timer; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 

public class ShearTest { 

    public static void main(String[] args) { 
     new ShearTest(); 
    } 

    public ShearTest() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
       } 

       JFrame frame = new JFrame("Testing"); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setLayout(new BorderLayout()); 
       frame.add(new TestPane()); 
       frame.pack(); 
       frame.setLocationRelativeTo(null); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    public class TestPane extends JPanel { 

     private BufferedImage img; 

     private float xScale = 1f; 
     private float xDelta = 0.05f; 

     public TestPane() { 

      try { 
       img = ImageIO.read(new File("C:\\hold\\thumbnails\\megatokyo.jpg")); 
      } catch (IOException ex) { 
       ex.printStackTrace(); 
      } 

      final Timer timer = new Timer(40, new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        xScale += xDelta; 
        if (xScale > 1) { 
         xDelta *= -1; 
        } else if (xScale < -1) { 
         xDelta *= -1; 
        } 
        repaint(); 
       } 
      }); 
      timer.start(); 
     } 

     @Override 
     public Dimension getPreferredSize() { 
      return img == null ? new Dimension(200, 200) : new Dimension(img.getWidth(), img.getHeight()); 
     } 

     @Override 
     protected void paintComponent(Graphics g) { 
      super.paintComponent(g); 
      if (img != null) { 
       Graphics2D g2d = (Graphics2D) g.create(); 

       int x = (int)((getWidth() - (img.getWidth() * xScale))/2); 
       int y = (getHeight() - img.getHeight())/2; 

       AffineTransform at = new AffineTransform(); 
       at.translate(x, y); 
       at.scale(xScale, 1); 

       g2d.setTransform(at); 
       g2d.drawImage(img, 0, 0, this); 

       g2d.dispose(); 
      } 
     } 
    } 
}