Question

我只想制作一个简单的水族箱类型的应用程序。鱼从左向右移动。（鱼的嘴朝右）。当它到达JFrame的末尾时，它返回。我想要的是它必须在它返回时面向左边。（返回）因此，当鱼到达特定坐标时，我决定用新图像绘画。怎么做？请。图像1 =嘴巴正对的图像鱼图像2 =嘴巴左侧的图像鱼

package aquarium;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.util.Random;
import javax.swing.Timer;


public class Aquarium extends JPanel implements ActionListener{
    Random r = new Random();
    Timer t = new Timer(5, this);
    int x = 0, y= 30;
    int velX = 1 ,velY =1;
    ImageIcon image  = new ImageIcon(getClass().getResource("../res/aquarium.gif"));
    ImageIcon image1 = new ImageIcon(getClass().getResource("../res/smallFish.gif"));
    ImageIcon image2 = new ImageIcon(getClass().getResource("../res/new.gif"));
    int numberFish = 12;
    Aquarium() {

    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        image.paintIcon(this, g, 0, 0);
        image1.paintIcon(this, g, x, y);
        t.start();
    }

    @Override
    public void actionPerformed(ActionEvent e){
        Graphics g = null;
        if(x<0 || x>465) {
            velX = -velX; 
        }
    x += velX;
    repaint();
    }

    public static void main(String[] args) {
        Aquarium a = new Aquarium();

        JFrame f = new JFrame();

        f.setTitle("The Aquarium");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
        f.setResizable(false);
        f.setBounds(500,200,500,300); //left,top,width,height 
        f.add(a);
    }
}

Answer 1

使用velX检查它是哪条鱼并绘制它：

public void paintComponent(Graphics g){
    super.paintComponent(g);

    image.paintIcon(this, g, 0, 0);
    if (velX > 0) { // moving right
        image1.paintIcon(this, g, x, y);
    } else { // moving left
        image2.paintIcon(this, g, x, y);

    }
    t.start();
}

如何从第一张图像的结束坐标重新绘制另一张图像？

1 个答案: