如何修复闪烁/闪烁 [英] How to fix blinking/flashing

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问题描述

每次单击时都会记录一个简单的程序，但当点击过快时，图像似乎闪烁/闪烁。 

  import java.awt。*; 
 import java.awt.event。*; 
 import java.awt.Graphics; 
 import javax.swing。*; 
 import java.lang.Object; 
 import java.net.URL; 
 import java.lang.String; 
 import java.awt.Font; 
 
 
 public class Spaceship extends Canvas 
 {
 private Font font1; 
 int myX = 100; 
 int myY = 400; 
 int count = 0;

这些是闪烁的2张图片，尽管使用的图片应该没有关系。

  Image img1 = Toolkit.getDefaultToolkit（）.getImage（spaceship.jpg）; 
 Image img2 = Toolkit.getDefaultToolkit（）.getImage（background.jpg）; 
 
 public Spaceship（）
 {
 setSize（new Dimension（1272，960））; 
 addMouseListener（new MouseAdapter（）
 {
 public void mousePressed（MouseEvent evt）
 {
 moveIt（evt）; 
 count = count + 1; 
} 
} 
）; 
 
 
 $ b public void moveIt（MouseEvent evt）
 {
 myY = evt.getY（） -  100; 
 myX = evt.getX（） -  150; 
 update（）; 
} 
 
 
 public void update（）
 {
 repaint（）; 
}

我假设这个问题在这里，但不确定如何解决。

  public void paint（Graphics g）
 {
 font1 = new Font（Serif， Font.BOLD，36）; 
 g.drawImage（img2，0，0，this）; 
 g.drawImage（img1，myX，myY，this）; 
 g.drawRect（1000，0，272，96）; 
 g.drawRect（1000，96，272，192）; 
 g.drawRect（1000，192，272，288）; 
 g.drawRect（1000，288，272，384）; 
 g.drawRect（1000，384，272，480）; 
 g.drawRect（1000，480，272，576）; 
 g.drawRect（1000，576，272，672）; 
 g.drawRect（1000，672，272，768）; 
 g.drawRect（1000，768，272，864）; 
 g.drawRect（1000，864，272，960）; 
 g.setFont（font1）; 
 g.drawString（Integer.toString（count），500，100）; 
 
 
 $ b public static void main（String [] args）
 {
 JFrame frame = new JFrame（Basic Game）; 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 Spaceship ex =新的Spaceship（）; 
 frame.getContentPane（）.add（ex）; 
 frame.pack（）; 
 frame.setResizable（false）; 
 frame.setVisible（true）; 
 ex.requestFocus（）; 
 
 
 
 
 $ b $ p 
 $ b 
我做错了什么？  
 
解决方案
建议：
最重要的是，使用Swing而不是AWT，因为它绘制了Swing JComponents会给你自动双缓冲 - 缺少这种情况可能会导致你的问题。 
 
  • 你甚至不应该混合你的AWT （Canvas）组件与您的Swing（JFrame）组件。再次，只需使用所有Swing组件。
    •  
     
  • 在JPanel的受保护的void paintComponent（Graphics g）方法中绘制。
    •  
     
  • 不要忘记在paintComponent重写中调用super的方法。
     
  • 将背景绘制到BufferedImage中，然后在<$ c $中显示BufferedImage c> paintComponent 方法。
    •  
      
     
     
     
     
     
     编辑 
     
    一些有用的链接：     
     
     
       
       
    •   Swing常规信息和链接 
      •  
       
    •   Swing教程 
      •  
       
    •  课程：执行自定义绘画 
      •  
       
    •  在AWT和Swing中绘画 
      •  
       
       
       
       $ b $编辑2  
       
      您声明： p> 
       
       
       
       
      完美地工作，感谢您的帮助 
       
      非常好，不客气！既然你已经解决了它，我发布我的版本感觉很好。随意提出任何问题或根据需要提供批评：
       
       pre $  import java.awt。*; 
       import java.awt.event。*; 
       import java.awt.image.BufferedImage; 
       import java.awt.Graphics; 
       
       import javax.imageio.ImageIO; 
       import javax.swing。*; 
       
       import java.io.IOException; 
       import java.lang.Object; 
      导入java.net.MalformedURLException; 
       import java.net.URL; 
       import java.lang.String; 
       import java.awt.Font; 
       
       public class Spaceship extends JPanel {
       private static final String BACKGROUND_PATH =http://www.thatsreallypossible.com/
       +wp-content / uploads / 2012 / 12 /空间Colonialisation.jpg; 
       private static final String SPRITE_PATH =http://www.pd4pic.com/
       +images250_ / ufo-flying-saucer-spacecraft-spaceship-alien.png; 
       
      私人字体font1; 
       int myX = 100; 
       int myY = 400; 
       int count = 0; 
      私有BufferedImage背景; 
       private BufferedImage sprite; 
       
       public Spaceship（）抛出IOException {
       URL backgroundUrl = new URL（BACKGROUND_PATH）; 
       URL spriteUrl =新的URL（SPRITE_PATH）; 
       background = ImageIO.read（backgroundUrl）; 
       sprite = ImageIO.read（spriteUrl）; 
       
       MouseAdapter myMouseAdapter = new MouseAdapter（）{
       public void mousePressed（MouseEvent evt）{
       moveIt（evt）; 
       count = count + 1; 
      } 
       
       @Override 
       public void mouseDragged（MouseEvent evt）{
       moveIt（evt）; 
      } 
      }; 
       addMouseListener（myMouseAdapter）; 
       addMouseMotionListener（myMouseAdapter）; 
       
       $ b @Override 
       public Dimension getPreferredSize（）{
       if（background！= null）{
      返回新Dimension（background.getWidth（） ，background.getHeight（））; 
      } 
      返回super.getPreferredSize（）; 
      } 
       
       public void moveIt（MouseEvent evt）{
       myY = evt.getY（） -  sprite.getHeight（）/ 2; 
       myX = evt.getX（） -  sprite.getWidth（）/ 2; 
       repaint（）; 
      } 
       
       
       @Override 
      保护void paintComponent（Graphics g）{
       super.paintComponent（g）; 
       font1 =新的字体（Serif，Font.BOLD，36）; 
       g.drawImage（background，0，0，this）; 
       g.drawImage（sprite，myX，myY，this）; 
       g.setColor（Color.yellow）; 
       int rectCount = 10; 
       //g.drawImage（img1，myX，myY，this）; 
       int height = getHeight（）/ rectCount; 
       int width = 272; 
       int x = getWidth（） -  width; 
       for（int i = 0; i  int y = i * height; 
       g.drawRect（x，y，width，height）; 
      } 
       g.setFont（font1）; 
       g.drawString（Integer.toString（count），500，100）; 
      } 
       
       public static void main（String [] args）{
       JFrame frame = new JFrame（Basic Game）; 
       frame.setDefaultCloseOperation（JFrame.DISPOSE_ON_CLOSE）; 
       Spaceship ex; 
      尝试{
       ex = new Spaceship（）; 
       frame.getContentPane（）。add（ex）; 
       frame.pack（）; 
       frame.setResizable（false）; 
       frame.setVisible（true）; 
       ex.requestFocus（）; 
      } catch（IOException e）{
       e.printStackTrace（）; 
      } 
      } 
      }


    Simple program that counts every time you click, however the image seems to blink/flash when clicked too fast. 

    import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics;
import javax.swing.*;
import java.lang.Object;
import java.net.URL;
import java.lang.String;
import java.awt.Font;


public class Spaceship extends Canvas
{
    private Font font1;
    int myX = 100;
    int myY = 400;
    int count = 0;

    These are the 2 images that flash, the images used shouldn't matter though.

        Image img1 = Toolkit.getDefaultToolkit ().getImage ("spaceship.jpg");
    Image img2 = Toolkit.getDefaultToolkit ().getImage ("background.jpg");

    public Spaceship ()
    {
        setSize (new Dimension (1272, 960));
        addMouseListener (new MouseAdapter ()
        {
            public void mousePressed (MouseEvent evt)
            {
                moveIt (evt);
                count = count + 1;
            }
        }
        );
    }


    public void moveIt (MouseEvent evt)
    {
        myY = evt.getY () - 100;
        myX = evt.getX () - 150;
        update ();
    }


    public void update ()
    {
        repaint ();
    }

    I assume this issue is in here somewhere but not really sure how to fix it.

        public void paint (Graphics g)
    {
        font1 = new Font ("Serif", Font.BOLD, 36);            
        g.drawImage (img2, 0, 0, this);
        g.drawImage (img1, myX, myY, this);
        g.drawRect (1000, 0, 272, 96);
        g.drawRect (1000, 96, 272, 192);
        g.drawRect (1000, 192, 272, 288);
        g.drawRect (1000, 288, 272, 384);
        g.drawRect (1000, 384, 272, 480);
        g.drawRect (1000, 480, 272, 576);
        g.drawRect (1000, 576, 272, 672);
        g.drawRect (1000, 672, 272, 768);
        g.drawRect (1000, 768, 272, 864);
        g.drawRect (1000, 864, 272, 960);
        g.setFont (font1);
        g.drawString (Integer.toString (count), 500, 100);

    }

    public static void main (String[] args)
    {
        JFrame frame = new JFrame ("Basic Game");
        frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        Spaceship ex = new Spaceship ();
        frame.getContentPane ().add (ex);
        frame.pack ();
        frame.setResizable (false);
        frame.setVisible (true);
        ex.requestFocus ();
    }
}

    What is it exactly that I'm doing wrong?

    解决方案

    Suggestions:

    • First and foremost, use Swing not AWT since drawing iwth Swing JComponents will give you automatic double buffering -- the lack of which is likely causing your problem.
    • You shouldn't even be mixing your AWT (Canvas) component with your Swing (JFrame) component. Again, just stick with all Swing components.
    • Draw in a JPanel's protected void paintComponent(Graphics g) method.
    • Don't forget to call the super's method in your paintComponent override.
    • Do background drawing into a BufferedImage, and then display that BufferedImage in the paintComponent method.

    Edit
    Some useful links:

    Edit 2
    You state:

    Got it working perfectly, thanks for the help

    Excellent and you're welcome! Since you've solved it, I feel OK in posting my version. Feel free to ask any questions or provide critique as needed:

    import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.awt.Graphics;

import javax.imageio.ImageIO;
import javax.swing.*;

import java.io.IOException;
import java.lang.Object;
import java.net.MalformedURLException;
import java.net.URL;
import java.lang.String;
import java.awt.Font;

public class Spaceship extends JPanel {
   private static final String BACKGROUND_PATH = "http://www.thatsreallypossible.com/"
         + "wp-content/uploads/2012/12/Space-Colonialisation.jpg";
   private static final String SPRITE_PATH = "http://www.pd4pic.com/"
         + "images250_/ufo-flying-saucer-spacecraft-spaceship-alien.png";

   private Font font1;
   int myX = 100;
   int myY = 400;
   int count = 0;
   private BufferedImage background;
   private BufferedImage sprite;

   public Spaceship() throws IOException {
      URL backgroundUrl = new URL(BACKGROUND_PATH);
      URL spriteUrl = new URL(SPRITE_PATH);
      background = ImageIO.read(backgroundUrl);
      sprite = ImageIO.read(spriteUrl);

      MouseAdapter myMouseAdapter = new MouseAdapter() {
         public void mousePressed(MouseEvent evt) {
            moveIt(evt);
            count = count + 1;
         }

         @Override
         public void mouseDragged(MouseEvent evt) {
            moveIt(evt);
         }
      };
      addMouseListener(myMouseAdapter);
      addMouseMotionListener(myMouseAdapter);
   }

   @Override
   public Dimension getPreferredSize() {
      if (background != null) {
         return new Dimension(background.getWidth(), background.getHeight());
      }
      return super.getPreferredSize();
   }

   public void moveIt(MouseEvent evt) {
      myY = evt.getY() - sprite.getHeight() / 2;
      myX = evt.getX() - sprite.getWidth() / 2;
      repaint();
   }


   @Override
   protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      font1 = new Font("Serif", Font.BOLD, 36);
      g.drawImage(background, 0, 0, this);
      g.drawImage(sprite, myX, myY, this);
      g.setColor(Color.yellow);
      int rectCount = 10;
      //g.drawImage(img1, myX, myY, this);
      int height = getHeight() / rectCount;
      int width = 272;
      int x = getWidth() - width;
      for (int i = 0; i < rectCount; i++) {
         int y = i * height;
         g.drawRect(x, y, width, height);
      }
      g.setFont(font1);
      g.drawString(Integer.toString(count), 500, 100);
   }

   public static void main(String[] args) {
      JFrame frame = new JFrame("Basic Game");
      frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      Spaceship ex;
      try {
         ex = new Spaceship();
         frame.getContentPane().add(ex);
         frame.pack();
         frame.setResizable(false);
         frame.setVisible(true);
         ex.requestFocus();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}

    这篇关于如何修复闪烁/闪烁的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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