Question

我需要知道如何在Thread启动后停止Java Graphics中的对象移动。通过更改指示形状的属性来完成动画。我试图在run()上设置条件以使对象停止移动，但似乎它没有通过条件。

这是我将动画的对象的代码。

import java.awt.*; 
import java.awt.geom.*; 
public class House implements DrawingObject
{
    private double x;
    private double y; 
    private Color roofC;
    private Color baseC; 
    private Triangle roof; 
    private Square base; 
    private double speed; 
    private double size; 
    public House(double a, double b, Color r, Color ba, double sz)
    {
        x = a; 
        y = b; 
        roofC = r; 
        baseC = ba; 
        size = sz;
        roof = new Triangle(x, y, x + (size / 2), y + (size / 3), x - (size / 2), y + (size / 3), roofC); 
        base = new Square(x - (size / 2), y + (size / 3), size, baseC); 
        speed = -5; 
    }

    public double getX()
    {
        return x; 
    }

    public void stop()
    {
        speed = 0; 
    }
    //these are the methods to be overridden when implementing DrawingObject
    public void draw(Graphics2D g2d, AffineTransform at)
    {
        roof.draw(g2d, affn); 
        base.draw(g2d, affn); 
    }

    public void animate()
    {
        roof.incX(speed); 
        base.incX(speed);
    }

这是我绘制对象并调用其animate()方法的代码。

import java.awt.*; 
import java.awt.geom.*; 
import javax.swing.*; 
import java.util.*; 
import java.awt.event.*; 
import javafx.scene.input.KeyCode; 

public class DrawingComponent extends JComponent implements Runnable
{
    private int width; 
    private int height; 
    private JFrame frame; 
    private boolean running; 
    private int delay; 
    private ArrayList<DrawingObject> dos = new ArrayList<DrawingObject>(); 
    private MyKeyListener mkl; 
    private Graphics2D g2d; 

    private House h; 

    public DrawingComponent(JFrame f)
    {
        frame = f; 
        running = false; 
        delay = 100; 
        h = new House(640, 200, Color.RED, Color.WHITE, 100); 
    }

    protected void paintComponent (Graphics g)
    {
        g2d = (Graphics2D) g; 

        AffineTransform reset = g2d.getTransform();

        RenderingHints rh = 
            new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        g2d.setRenderingHints(rh);




        //move to 250, 200
        h.draw(g2d, reset); 
        dos.add(h); 
    }

    public void activateKL()
    {
        mkl = new MyKeyListener(); 
        frame.getContentPane().addKeyListener(mkl); 
        frame.getContentPane().setFocusable(true); 
    }

    class MyKeyListener implements KeyListener 
    {

        Thread t1 = new Thread(DrawingComponent.this);
        public void keyTyped(KeyEvent e)
        { 
            if(!running)
            {
                running = true; 
                t1.start(); 
            }
        }

        public void keyPressed(KeyEvent e)
        { 
            if(!running)
            {
                running = true; 
                t1.start(); 
            }

        }

        public void keyReleased(KeyEvent e)
        {
        }
    }

    public void run() 
    {
        while(running)
        {
            animateAll();  
            repaint(); 
            try
            {
                Thread.sleep(delay); 
            }
            catch (InterruptedException ex)
            {
            }
            if(h.getX() <= 250)
            {
                h.stop(); 
            }
        }
    }

    public void animateAll()
    {
        for (int i = 0; i < dos.size(); i++)
        {
            dos.get(i).animate(); 
        }
    }
}

在DrawingComponent方法中，有一个DrawingObject的ArrayList，据说拥有该实现的所有对象。 animateAll()调出ArrayList中每个DrawingObject的所有动画。

所以我在这里使用了一种方法来改变以阻止House对象移动，但它仍然不起作用。我甚至尝试将条件if(h.getX() <= 250)放在House类中，甚至放在animateAll()类中。我在代码中遗漏了什么吗？

PS：我需要执行此类程序，因此不会批准使用计时器或删除animateAll()方法等建议。

PS 2：我不确定是否已有答案，但我已经检查了其他答案，但没有一个解决了我的问题。

如何在Java中停止动画？

0 个答案: