java – 在Swing中移动背景图像

这是肉

我看到你做错了一些事情：

>不断创建新图像.只需使用相同的图像.
>我会,而不是使用标签,只是在绘画表面上绘制一个Image / BufferedImage.
>忘记两个计时器.你可以用一个到期.这就是你管理国家的方式.
>不要在paint方法中做任何逻辑.在你目前的情况下,因为甚至没有画任何东西,你甚至不需要它.在我的例子中,虽然我画了图像.
>不要在JFrame上绘制并覆盖绘制.改为在JPanel中覆盖paintComponent并将该面板添加到框架中.
>最后,关键成分,使用方法(从Graphics) –

public abstract boolean drawImage(Image img,int dx1,int dy1,int dx2,int dy2,int sx1,int sy1,int sx2,int sy2,ImageObserver observer)

你可以得到一个更好的解释in this post.基本上,s点是源图像,所以你可以在动画期间移动sx1和sx2,它将移动图像的一部分绘制在d点绘画表面.

如果你不知道如何真正做自定义绘画,我建议你通过Performing Custom Painting

这是完整的例子

(注意我用于背景的图像是2000×350)

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

public class MovingBackgroundDemo {

    public MovingBackgroundDemo() {
        JFrame frame = new JFrame();
        frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new AnimatingPanel());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private class AnimatingPanel extends JPanel {
        private static final int DIM_W = 350;
        private static final int DIM_H = 350;
        private static final int INCREMENT = 10;

        private BufferedImage backgroundImage;
        private Image runnerImage;

        private int dx1,dy1,dx2,dy2;
        private int srcx1,srcy1,srcx2,srcy2;
        private int IMAGE_WIDTH;

        public AnimatingPanel() {
            initImages();
            initImagePoints();
            Timer timer = new Timer(40,new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    moveBackground();
                    repaint();
                }
            });
            timer.start();

            FlowLayout layout = (FlowLayout)getLayout();
            layout.setHgap(0);
            layout.setVgap(0);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.setColor(Color.WHITE);
            g.fillRect(0,getWidth(),getHeight());
            g.drawImage(backgroundImage,dx1,dy2,srcx1,srcy2,this);
            g.drawImage(runnerImage,getHeight(),this);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(350,350);
        }

        private void initImagePoints() {
            dx1 = 0;
            dy1 = 0;
            dx2 = DIM_W;
            dy2 = DIM_H;
            srcx1 = 0;
            srcy1 = 0;
            srcx2 = DIM_W;
            srcy2 = DIM_H;
        }

        private void initImages() {
            try {
                runnerImage = new ImageIcon(getClass().getResource("runner.gif")).getImage();
                backgroundImage = ImageIO.read(getClass().getResource(
                        "background.png"));
                IMAGE_WIDTH = backgroundImage.getWidth();
                System.out.println(IMAGE_WIDTH);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }

        private void moveBackground() {
            if (srcx1 > IMAGE_WIDTH) {
                srcx1 = 0 - DIM_W;
                srcx2 = 0;
            } else {
                srcx1 += INCREMENT;
                srcx2 += INCREMENT;
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new MovingBackgroundDemo();
            }
        });
    }
}