Question

    package local.ryan.grid;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;

public class Game implements Runnable, KeyListener {

    public boolean isRunning = false;

    private long lastTime;
    private double fps;
    public int gamestage = 0;

    public int width = 300, height = 300;
    public String title = "Le Go!";

    public JFrame frame = new Frame(2, width, height, title);

    public int x = 0, y = 0, velX = 0, velY = 0;

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

        Thread game = new Thread(new Game());
        game.start();

    }

    public void run() {

        frame.addKeyListener(this);
        frame.setFocusable(true);
        frame.setFocusTraversalKeysEnabled(false);
        start();

        while(isRunning) {

            lastTime = System.nanoTime();

            try {

                // Limit Each Frame, to 60 fps.
                // Prevents performance issues with multiple objects.

            Thread.sleep(1000 / 60); // 1000 miliseconds (1 second) / 60 frames-per-second ~ 17 ms.



            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            render(frame.getGraphics());

            fps = 1000000000D / (System.nanoTime() - lastTime); //one second(nano) divided by amount of time it takes for one frame to finish
            lastTime = System.nanoTime();

            // Change to integer, to remove decimals.
            System.out.println("FPS: " + (int) fps + ".");

        }

    }

    public void render(Graphics c) {   

        c.clearRect(0, 0, width, height);
        Graphics2D g = (Graphics2D)c;

        g.setColor(Color.RED);
        g.fillRect(x, y, 30, 60);

        g.dispose();

    }  

    public void start() {

        if(isRunning)
            return;

        isRunning = true;


    }

    public void stop() {

        if(!isRunning)
            return;

        isRunning = false;


    }

    @Override
    public void keyPressed(KeyEvent e) {

        if(e.getKeyCode() == KeyEvent.VK_D) {

            velX += 1;
            actionPerformed();
            try {
                Thread.sleep(50);
            } catch (InterruptedException e1) {
                e1.printStackTrace();
            }

        }


    }

    @Override
    public void keyReleased(KeyEvent e) {
    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    public void actionPerformed() {

        x = x + velX;
        y = y + velY;
        render(frame.getGraphics());

    }

}

我如何防止渲染中的闪烁，它一切正常，除非它在闪烁时烦人。我想我可以添加一个if语句来检查VelX或VelY是否不等于0，但是当我移动正方形时它会闪烁！请跟我说。

Answer 1

可能有一些原因，但现在查看代码的原因是因为它不是双缓冲的。当您的图形被双重缓冲时，计算机将绘制到虚拟屏幕，然后将其与显示的屏幕切换，以防止闪烁。

这样的东西会实现双缓冲：

private void render(Graphics g) 
{
   BufferedImage bufferedImage = new BufferedImage(500, 500, BufferedImage.TYPE_ARGB);
   Graphics2D g2d = bufferedImage.createGraphics();
   //paint using g2d ...

   Graphics2D g2dComponent = (Graphics2D) g;
   g2dComponent.drawImage(bufferedImage, null, 0, 0);

}

有关更多信息，我相信Java文档有一些很好的教程。

如何防止Java 2DGraphics中的闪烁？

1 个答案: