如何在awt中填充整个窗口答案

【问题标题】：How to fill the whole window in awt如何在awt中填充整个窗口
【发布时间】：2015-04-22 05:41:15
【问题描述】：

我正在使用 java awt 来渲染一个简单的矩形。我还有一个矩形用作窗口的背景。问题是，即使背景矩形设置为窗口的宽度和高度，它仍然不适合整个事物。我试过用谷歌搜索，但发现结果与我的需求无关。这是什么原因造成的？

import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.image.BufferStrategy;
import java.awt.Color;

import javax.swing.JFrame;
import javax.swing.JPanel;


public class Game implements Runnable{

   final int WIDTH = 640;
   final int HEIGHT = 480;

   JFrame frame;
   Canvas canvas;
   BufferStrategy bufferStrategy;

   boolean running = false;

   public Game(){
      frame = new JFrame("Prototyping");

      JPanel panel = (JPanel) frame.getContentPane();
      panel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
      panel.setLayout(null);


      canvas = new Canvas();
      canvas.setBounds(0, 0, WIDTH, HEIGHT);
      canvas.setIgnoreRepaint(true);

      panel.add(canvas);

      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setResizable(false);
      frame.setVisible(true);

      canvas.createBufferStrategy(2); 
      bufferStrategy = canvas.getBufferStrategy();

      canvas.requestFocus();
   }



   public void run(){

      running = true;
      while(running)         
         render();
   }

   private void render() {
      Graphics2D g = (Graphics2D) bufferStrategy.getDrawGraphics();
      g.clearRect(0, 0, WIDTH, HEIGHT);
      render(g);
      g.dispose();
      bufferStrategy.show();
   }

   protected void update(){

   }

   protected void render(Graphics2D g){
      g.setColor(Color.GRAY);
      g.fillRect(0, 0, WIDTH, HEIGHT);

      g.setColor(Color.BLUE);
      g.fillRect(100, 0, 200, 200);
   }

   public static void main(String [] args){
      Game game = new Game();
      new Thread(game).start();
   }

}

【问题讨论】：

"..即使背景矩形设置为窗口的宽度和高度，它仍然不适合整个东西。" 等等..什么？灰色矩形填充 UI（此处）。蓝色矩形刻意画得比 UI 小。顺便说一句：Java GUI 必须在不同的操作系统、屏幕尺寸、屏幕分辨率等上工作。因此，它们不利于像素完美布局。而是使用布局管理器，或 combinations of them 以及 white space 的布局填充和边框。
@AndrewThompson 感谢这些链接。虽然我看到的问题是侧面的空白：i.imgur.com/fcn7Ggx.gif。我认为这与 null 布局有关？
哦，我的错……我想我可能在查看结果之前添加了一个布局。把panel.setLayout(null);改成panel.setLayout(new GridLayout());看看好不好..
@AndrewThompson 也没有这样做。

标签： java swing awt java-2d

【解决方案1】：

这在这里完美无缺。仔细检查差异，因为我忘记了改变了什么。

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

public class Game implements Runnable{

   final int WIDTH = 640;
   final int HEIGHT = 480;

   JFrame frame;
   Canvas canvas;
   BufferStrategy bufferStrategy;

   boolean running = false;

   public Game(){
      frame = new JFrame("Prototyping");

      JPanel panel = (JPanel) frame.getContentPane();
      panel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
      panel.setLayout(new GridLayout());


      canvas = new Canvas();
      //canvas.setBounds(0, 0, WIDTH, HEIGHT);
      canvas.setIgnoreRepaint(true);

      panel.add(canvas);

      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setResizable(false);
      frame.setVisible(true);

      canvas.createBufferStrategy(2); 
      bufferStrategy = canvas.getBufferStrategy();

      canvas.requestFocus();
   }

   public void run(){
      running = true;
      while(running)         
         render();
   }

   private void render() {
      Graphics2D g = (Graphics2D) bufferStrategy.getDrawGraphics();
      g.clearRect(0, 0, WIDTH, HEIGHT);
      render(g);
      g.dispose();
      bufferStrategy.show();
   }

   protected void render(Graphics2D g){
      g.setColor(Color.GRAY);
      g.fillRect(0, 0, WIDTH, HEIGHT);

      g.setColor(Color.BLUE);
      g.fillRect(100, 0, 200, 200);
   }

   public static void main(String [] args){
      Game game = new Game();
      new Thread(game).start();
   }
}

【讨论】：