Java粘液排球图像闪烁

Question

我已经开始制作粘液排球了。我遇到了这个问题，其中粘液角色的图像疯狂地闪烁。图像消失的时间大约相同。

我尝试删除super.paint（g）;在paint方法中修复了闪烁问题，但是它创建了一个新问题，不能从以前的位置删除图像。

源代码：

package slimevolleyball.main;

import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;

public class Main extends JFrame {

    private static final long serialVersionUID = 1L;
    public static int x = 275;
    public static int y = 300;
    public static boolean right = false;
    public static boolean left = false;
    public static boolean jump = false;
    public static int startjump = 0;
    public static int low = 300;
    public static double gravity = 0;
    public static double time = 0;
    public static int startVelocity = 0;
    public static double velocity = 0;

    public static BufferedImage slime1;
    public static BufferedImage slime2;
    public static BufferedImage background;

    static Rectangle FrameSize;

    static JFrame frame = new JFrame();

    public Main() {

        addKeyListener(new KeyListener() {

            public void keyTyped(KeyEvent e) {
            }

            public void keyReleased(KeyEvent e) {

                int keyCode = e.getKeyCode();

                switch (keyCode) {

                    case KeyEvent.VK_UP:

                        break;

                    case KeyEvent.VK_DOWN:

                        break;

                    case KeyEvent.VK_LEFT:

                        left = false;

                        break;

                    case KeyEvent.VK_RIGHT:

                        right = false;

                }

            }

            public void keyPressed(KeyEvent e) {

                int keyCode = e.getKeyCode();

                switch (keyCode) {

                    case KeyEvent.VK_UP:

                        if (jump == false) {

                            jump = true;

                            startjump = 1;

                        }

                        break;

                    case KeyEvent.VK_DOWN:

                        break;

                    case KeyEvent.VK_LEFT:

                        left = true;

                        right = false;

                        break;

                    case KeyEvent.VK_RIGHT:

                        right = true;

                        left = false;

                        break;

                }

            }

        });

        setFocusable(true);

        setTitle("Slime VolleyBall");

        setSize(600, 400);

        setResizable(true);

        setVisible(true);

        setDefaultCloseOperation(EXIT_ON_CLOSE);

    }

    public void paint(Graphics g) {

        super.paint(g);

        g.drawImage(slime1, x, y, null);

    }

    public static void main(String[] args) throws InterruptedException, IOException {

        Main game = new Main();

        slime1 = ImageIO.read(new File("red.png"));

        while (true) {

            MoveSlime1();

            Update();

            game.repaint();

            Thread.sleep(2);

        }

    }

    private static void Update() {

        FrameSize = frame.getBounds();

    }

    private static void MoveSlime1() {

        if (right == true && x <= FrameSize.getWidth() / 2) {

            x += 1;

        } else if (left == true && x >= 0) {

            x -= 1;

        }

        if (jump == true) {

            if (startjump == 1) {

                low = 300;

                gravity = -9.8;

                time = 0;

                startVelocity = 3;

                velocity = 0;

                startjump = 0;

            } else {

                velocity = startVelocity + (gravity * time);

                y -= velocity;

                time += 0.005;

                if (time > 0.01 && y >= low) {

                    jump = false;

                }

            }

        }

    }
}

Answer 1

JFrame不是双缓冲的，因此是闪烁，这只是为什么你不应该从JFrame延伸并覆盖它paint的一个原因之一方法

相反，将所有逻辑移到一个扩展JPanel的类，然后覆盖它的paintComponent方法，这样，您就可以免费获得双缓冲。< / p>

此外，您应该避免使用KeyListener并使用Key Bindings API来解决KeyListener

中与焦点相关的问题

另外，static不是你的朋友，你应该学会在没有它的情况下生活