2

我试图修改现有代码以根据按键旋转图像。到目前为止，我已经设法做到以下几点，但我被困住了。我第一次使用仿射变换。当它应该旋转与按下 RIGHT 键一样多的次数时，图像只旋转一次。

package aircraftPackage;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;

public class RotateImage extends JFrame implements KeyListener {
    private static final long serialVersionUID = 1L;
    private Image TestImage;
    private BufferedImage bf;
    private int cordX = 100;
    private int cordY = 100;
    private double currentAngle;

    public RotateImage(Image TestImage) {
     this.TestImage = TestImage;
     MediaTracker mt = new MediaTracker(this);
     mt.addImage(TestImage, 0);
     try {
       mt.waitForID(0);
     }
     catch (Exception e) {
       e.printStackTrace();
     }
        setTitle("Testing....");
        setSize(500, 500);
        imageLoader();
        setVisible(true);
    }
public void rotate() {
     //rotate 5 degrees at a time
     currentAngle+=5.0;
     if (currentAngle >= 360.0) {
       currentAngle = 0;
     }
     repaint();
   }


    public void imageLoader() {
        try {
            String testPath = "test.png";
            TestImage = ImageIO.read(getClass().getResourceAsStream(testPath));

        } catch (IOException ex) {
            ex.printStackTrace();
        }

        addKeyListener(this);
    }

    public void update(Graphics g){
           paint(g);
    }

    public void paint(Graphics g){

        bf = new BufferedImage( this.getWidth(),this.getHeight(), BufferedImage.TYPE_INT_RGB);

    try{
    animation(bf.getGraphics());
    g.drawImage(bf,0,0,null);
    }catch(Exception ex){

    }
}

    public void animation(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D)g;
        AffineTransform origXform = g2d.getTransform();
        AffineTransform newXform = (AffineTransform)(origXform.clone());
        //center of rotation is center of the panel
        int xRot = this.getWidth()/2;
        int yRot = this.getHeight()/2;
        newXform.rotate(Math.toRadians(currentAngle), xRot, yRot);
        g2d.setTransform(newXform);
        //draw image centered in panel
        int x = (getWidth() - TestImage.getWidth(this))/2;
        int y = (getHeight() - TestImage.getHeight(this))/2;
        g2d.drawImage(TestImage, x, y, this);
        g2d.setTransform(origXform);
        g.drawImage(TestImage, cordX, cordY, this);
    }

    public static void main(String[] args) {

        new RotateImage(null);
    }

    public void keyPressed(KeyEvent ke) {
            final RotateImage ri = new RotateImage(TestImage);

        switch (ke.getKeyCode()) {
        case KeyEvent.VK_RIGHT: {
            cordX += 5;

           ri.rotate();
        }
            break;
        case KeyEvent.VK_LEFT: {
            cordX -= 5;
        }
            break;
        case KeyEvent.VK_DOWN: {
            cordY += 5;
        }
            break;
        case KeyEvent.VK_UP: {
            cordY -= 3;
        }
            break;
        }
        repaint();
    }

    public void keyTyped(KeyEvent ke) {
    }

    public void keyReleased(KeyEvent ke) {
    }
}

如果有人能纠正我在哪里犯了错误，那将会很有帮助。谢谢

4

2 回答 2

3

您在每个事件键上创建新的旋转图像的问题，因此看起来不起作用尝试将此行的位置更改为在每个键事件上不可修改

public static void main(String[] args) {

        new RotateImage(null);
    }

    public void keyPressed(KeyEvent ke) {
            final RotateImage ri = new RotateImage(TestImage);

更新：

原因是构造函数的值为 null 你应该传递图像

new RotateImage(null);

在你的代码上修改这个

1）使其静态

private static Image TestImage;

2）定义

private static RotateImage ri;

3）像这样调用main

public static void main(String[] args) {
         ri = new RotateImage(TestImage);
    }

第 4 步（已删除）

更新：

阅读有关堆栈溢出的这些问题 另一个问题

更新2：

这是它完美工作的完整代码（右键）不要忘记将您的图像包含在同一个包中，并且它的类型相同.png这里是代码

package aircraftPackage;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;

public class RotateImage extends JFrame implements KeyListener {
    private static final long serialVersionUID = 1L;
    private static Image TestImage;
    private static RotateImage ri;
    private BufferedImage bf;
    private int cordX = 100;
    private int cordY = 100;
    private double currentAngle;

    public RotateImage(Image TestImage) {
     this.TestImage = TestImage;
     MediaTracker mt = new MediaTracker(this);
     mt.addImage(TestImage, 0);
     try {
       mt.waitForID(0);
     }
     catch (Exception e) {
       e.printStackTrace();
     }
        setTitle("Testing....");
        setSize(500, 500);
        imageLoader();
        setVisible(true);
    }
public void rotate() {
     //rotate 5 degrees at a time
     currentAngle+=5.0;
     if (currentAngle >= 360.0) {
       currentAngle = 0;
     }
     repaint();
   }


    public void imageLoader() {
        try {
            String testPath = "test.png";
            TestImage = ImageIO.read(getClass().getResourceAsStream(testPath));

        } catch (IOException ex) {
            ex.printStackTrace();
        }

        addKeyListener(this);
    }

    public void update(Graphics g){
           paint(g);
    }

    public void paint(Graphics g){

        bf = new BufferedImage( this.getWidth(),this.getHeight(), BufferedImage.TYPE_INT_RGB);

    try{
    animation(bf.getGraphics());
    g.drawImage(bf,0,0,null);
    }catch(Exception ex){

    }
}

    public void animation(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D)g;
        AffineTransform origXform = g2d.getTransform();
        AffineTransform newXform = (AffineTransform)(origXform.clone());
        //center of rotation is center of the panel
        int xRot = this.getWidth()/2;
        int yRot = this.getHeight()/2;
        newXform.rotate(Math.toRadians(currentAngle), xRot, yRot);
        g2d.setTransform(newXform);
        //draw image centered in panel
        int x = (getWidth() - TestImage.getWidth(this))/2;
        int y = (getHeight() - TestImage.getHeight(this))/2;
        g2d.drawImage(TestImage, x, y, this);
        g2d.setTransform(origXform);
        g.drawImage(TestImage, cordX, cordY, this);
    }

    public static void main(String[] args) {
         ri = new RotateImage(TestImage);

    }

    public void keyPressed(KeyEvent ke) {

        switch (ke.getKeyCode()) {
        case KeyEvent.VK_RIGHT: {
            cordX += 5;

           ri.rotate();
        }
            break;
        case KeyEvent.VK_LEFT: {
            cordX -= 5;
            ri.rotate();
        }
            break;
        case KeyEvent.VK_DOWN: {
            cordY += 5;
            ri.rotate();
        }
            break;
        case KeyEvent.VK_UP: {
            cordY -= 3;
            ri.rotate();
        }
            break;
        }
        repaint();
    }

    public void keyTyped(KeyEvent ke) {
    }

    public void keyReleased(KeyEvent ke) {
    }
}
于 2012-06-12T08:33:38.640 回答
1 
 public void keyPressed(KeyEvent ke) {
            final RotateImage ri = new RotateImage(TestImage);

        switch (ke.getKeyCode()) {
        case KeyEvent.VK_RIGHT: {
            cordX += 5;

           ri.rotate();
        }

似乎您每次都在旋转相同的图像，所以它总是只旋转 5 度。

编辑：哼哼太晚了。. 见 shareef 帖子。

于 2012-06-12T08:38:14.210 回答