2017-11-18 21 views
0

遵循2015年11月发布的指南,我已经逐字复制了他的代码,但它仍然不适用于我。有东西被弃用?如何在java中使用BufferStrategy时避免黑线

我有3个缓冲区(称它们1,2和3)。当2和3画在屏幕上时,屏幕的顶部和左侧会有黑线。这个相同的代码适用于两个缓冲区。

错误镜头:https://gfycat.com/gifs/detail/GraveCompetentArmyworm

package field; 

import javax.swing.JFrame; 

import java.awt.*; 
import java.awt.image.BufferStrategy; 

public class Main extends JFrame{ 

    private Canvas canvas=new Canvas(); 

    public Main() { 
     setDefaultCloseOperation(EXIT_ON_CLOSE); 

     setBounds(0,0,1000,1000); 

     setLocationRelativeTo(null); 

     add(canvas); 
     setVisible(true); 

     canvas.createBufferStrategy(3); 
     BufferStrategy buffert = canvas.getBufferStrategy(); 

     int p=0; 
     int ap=0; 
     while(p<1000) { 
      if (ap==100){ 
       p++; 
       ap=0; 
      } 
      ap++; 
      buffert=canvas.getBufferStrategy(); 
      Graphics g = buffert.getDrawGraphics(); 
      super.paint(g); 
      g.setColor(Color.GREEN); 

      g.fillOval(p+100, 200, 50, 50); 

      buffert.show(); 
     } 
    } 

// public void paint(Graphics graphics) { 
//  super.paint(graphics); 
//  graphics.setColor(Color.RED); 
//  graphics.fillOval(100, 100, 100, 100); 
//  
// } 



    public static void main(String[] args){ 


     new Main(); 




    } 

} 
+1

'super.paint(g);'将是第一个错误。你应该自己清除缓冲区 – MadProgrammer

+0

让我试着澄清一下。画布是框架的一个孩子,它的位置被框架边框所抵消,通过调用super.paint,您要求框架将自己绘制到图形上,黑色条实际上是通常由窗口装饰覆盖的区域 – MadProgrammer

+0

太棒了!我将super.paint(g)更改为canvas.paint(g),它现在按预期工作。 –

回答

1

你需要去阅读the JavaDocs for BufferStrategyFull-Screen Exclusive Mode API,这对BufferStrategy

一个BufferStrategy一些重要的教程和例子是执行“翻页”的手段,这与常规喷漆系统无关。这为您提供对绘画过程的“主动”控制。每个缓冲区在屏幕上都会更新,并在准备就绪时推送到屏幕上。

这通常不涉及组件自己的绘画系统,其目的是避免它。

这意味着您不应该在JFramecanvas.paint上致电super.paint(g)。实际上,一般来说,您绝不应手动拨打paint

每次你想更新一个缓冲区时,你都需要“准备”它。这通常意味着有一些基本的颜色填充

因此,基于从JavaDoc中的例子,你可以这样做......

// Check the capabilities of the GraphicsConfiguration 
... 

// Create our component 
Window w = new Window(gc); 

// Show our window 
w.setVisible(true); 

// Create a general double-buffering strategy 
w.createBufferStrategy(2); 
BufferStrategy strategy = w.getBufferStrategy(); 

// Main loop 
while (!done) { 
    // Prepare for rendering the next frame 
    // ... 

    // Render single frame 
    do { 
     // The following loop ensures that the contents of the drawing buffer 
     // are consistent in case the underlying surface was recreated 
     do { 
      // Get a new graphics context every time through the loop 

      // Determine the current width and height of the 
      // output 
      int width = ...; 
      int height = ...l 
      // to make sure the strategy is validated 
      Graphics graphics = strategy.getDrawGraphics(); 
      graphics.setColor(Color.WHITE); 
      graphics.fillRect(0, 0, width, height);  
      // Render to graphics 
      // ... 

      // Dispose the graphics 
      graphics.dispose(); 

      // Repeat the rendering if the drawing buffer contents 
      // were restored 
     } while (strategy.contentsRestored()); 

     // Display the buffer 
     strategy.show(); 

     // Repeat the rendering if the drawing buffer was lost 
    } while (strategy.contentsLost()); 
} 

// Dispose the window 
w.setVisible(false); 
w.dispose(); 

现在,就个人而言,我宁愿使用Canvas作为因为它提供了更多可重用的解决方案,并且更容易确定尺寸从

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