如何以平行四边形的形状绘制图像？

问题描述

所以，我知道图像可以被裁剪，缩小和扩展，但是你可以将图像调整为平行四边形的形状吗？我正在使用Java Swing绘制图像。我想也许某些类或BufferedImage的某种方法可能会做到这一点，但我找不到任何东西。我也搜索了Google一段时间，但我找不到答案。有没有人知道我可以做到这一点，或解释它的网页？您可以使用 AffineTransform.getShearInstance 。

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此示例使用 AffineTransformOp 来过滤原始图像

  import java.awt.BorderLayout; 
 import java.awt.Dimension; 
 import java.awt.EventQueue; 
 import java.awt.Graphics; 
 import java.awt.Graphics2D; 
 import java.awt.GridLayout; 
 import java.awt.RenderingHints; 
 import java.awt.geom.AffineTransform; 
 import java.awt.image.AffineTransformOp; 
 import java.awt.image.BufferedImage; 
 import java.io.File; 
 import java.io.IOException; 
 import javax.imageio.ImageIO; 
 import javax.swing.ImageIcon; 
 import javax.swing.JFrame; 
 import javax.swing.JLabel; 
 import javax.swing.JPanel; 
 import javax.swing.UIManager; 
 import javax.swing.UnsupportedLookAndFeelException; 
 
 public class SkewImage {
 
 public static void main（String [] args）{
 new SkewImage（）; 
 
 $ b $ public SkewImage（）{
 EventQueue.invokeLater（new Runnable（）{
 @Override 
 public void run（）{
尝试{
 UIManager.setLookAndFeel（UIManager.getSystemLookAndFeelClassName（））; 
} catch（ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex）{
} 
 
 JFrame框架= 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 {
 $ b $ public TestPane（）{
 setLayout（new GridLayout（1，2））; 
尝试{
 BufferedImage original = ImageIO.read（new File（C：\\\\\\\\\\\\\\\\\\\））; 
 BufferedImage skew = new BufferedImage（original.getWidth（），original.getHeight（），BufferedImage.TYPE_INT_ARGB）; 
 
 //如果我们使用负斜率来调整图像宽度... 
 double skewX = 0.3d; 
 double x =（skewX  AffineTransform at = AffineTransform.getTranslateInstance（x，0）; 
 at.shear（skewX，0）; 
 AffineTransformOp op = new AffineTransformOp（at，
 new RenderingHints（RenderingHints.KEY_INTERPOLATION，
 RenderingHints.VALUE_INTERPOLATION_BICUBIC））; 
 skew = op.filter（original，null）; 
 
 add（new JLabel（new ImageIcon（original）））; 
 add（new JLabel（new ImageIcon（skew）））; 
} catch（IOException ex）{
 ex.printStackTrace（）; 
} 
} 
} 
 
} 
  

So, I know that images can be cropped, shrunk, and expanded, but can you adapt an image into the shape of a parallelogram? I'm using Java Swing to draw images. I was thinking maybe some class or some method of BufferedImage might do the trick, but I couldn't find anything. I have also searched Google for a while, but I cannot find an answer. Does anyone know of a way I could do this, or a webpage that explains it? Thanks in advance.

解决方案

You could use AffineTransform.getShearInstance.

This example uses a AffineTransformOp to "filter" the original image

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class SkewImage {

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

    public SkewImage() {
        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 {

        public TestPane() {
            setLayout(new GridLayout(1, 2));
            try {
                BufferedImage original = ImageIO.read(new File("C:\\hold\\thumbnails\\Megatokyo_707___Torn_by_crusaderky.jpg"));
                BufferedImage skew = new BufferedImage(original.getWidth(), original.getHeight(), BufferedImage.TYPE_INT_ARGB);

                // Adjust the image width if we use a negative skew...
                double skewX = 0.3d;
                double x = (skewX < 0) ? -skewX * original.getHeight() : 0;
                AffineTransform at = AffineTransform.getTranslateInstance(x, 0);
                at.shear(skewX, 0);
                AffineTransformOp op = new AffineTransformOp(at,
                        new RenderingHints(RenderingHints.KEY_INTERPOLATION,
                                RenderingHints.VALUE_INTERPOLATION_BICUBIC));
                skew = op.filter(original, null);

                add(new JLabel(new ImageIcon(original)));
                add(new JLabel(new ImageIcon(skew)));
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

}

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