我的JPanel类没有在我的JFrame上绘制一个矩形？

时间：2014-01-24 13:46:58

标签： java swing jpanel paintcomponent tetris

我正在尝试使用java制作一个俄罗斯方块游戏但是我目前只是想让我的游戏网格上出现一个形状...我看了我的代码并且找不到任何错误或错误，这意味着这不会工作？

这是我的主要课程名为Tetris6。

package tetris6;


import java.awt.Graphics;
import javax.swing.*;


public class Tetris6 {

    public static final int WIDTH = 400, HEIGHT = 825;


    public static void main(String[] args) {

    GamePanel gamePanel = new GamePanel();

    JFrame frame = new JFrame();
    frame.setLayout(null);
    frame.setResizable(false);
    frame.setSize(WIDTH,HEIGHT);
    frame.setTitle("Tetris");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(MenuBar.MenuBar());
    frame.add(BoardGrid.GameGrid());
    frame.add(gamePanel);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);


    }

}

这是我的类，它使用JPanels创建网格。

public class BoardGrid {    


    public static JPanel GameGrid () {  


        JPanel Grid = new JPanel (new GridLayout(20,10));

        for (int i=0; i < 200; i++){

        Grid.add(createSquareJPanel(Color.white,30));


        }

        Grid.setVisible(true);
        Grid.setBorder(BorderFactory.createLineBorder(Color.white));
        Grid.setBounds(0,50,400,625);

        return Grid;

        }

    private static JPanel createSquareJPanel(Color color, int size)
    {
        JPanel tempPanel = new JPanel();
        tempPanel.setBackground(color);
        tempPanel.setMinimumSize(new Dimension(size, size));
        tempPanel.setMaximumSize(new Dimension(size, size));
        tempPanel.setPreferredSize(new Dimension(size, size));
        tempPanel.setBorder(BorderFactory.createLineBorder(Color.blue));
        return tempPanel;
    }

}

这是我创建菜单栏的课程。

package tetris6;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import static tetris6.Tetris6.WIDTH;

/**
 *
 */
public class MenuBar {

    public static JMenuBar MenuBar () {



    JMenuBar bar = new JMenuBar();
    bar.setBounds(0,0, WIDTH, 25);

    JMenu file = new JMenu("File");
    file.setBounds(0,0,45,24);

    JMenuItem newGame = new JMenuItem("New Game");
    newGame.addActionListener(new ActionListener(){
       @Override
       public void actionPerformed(ActionEvent e){
           //code for new game
           System.out.println("Starting new game...");
       }
    });

    JMenuItem highScore = new JMenuItem("High Score");
    highScore.addActionListener(new ActionListener(){
       @Override
       public void actionPerformed(ActionEvent f){
           int highscore = 0; //replace this with getHighscoreMethod later
           final JFrame alert = new JFrame("HighScore");
           alert.setSize(200,200);
           alert.setLayout(null);
           alert.setLocationRelativeTo(null);

           JLabel score = new JLabel ("The highscore is " + highscore);
           score.setBounds(35,0,200,50);

           JButton okayButton = new JButton("Okay");
           okayButton.setBounds(50,120,100,30);
           okayButton.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e){
                alert.dispose();
            }   
           });
           alert.add(score);
           alert.add(okayButton);
           alert.setResizable(false);
           alert.setVisible(true);
       }
    });

    JMenuItem exit = new JMenuItem("Exit");
    exit.addActionListener(new ActionListener(){
       @Override
       public void actionPerformed(ActionEvent g){
           System.out.println("Closing...");
           System.exit(0);
       }
    });


    file.add(newGame);
    file.add(highScore);
    file.add(exit);
    bar.add(file);

    return bar;

}

}

这是我创建我的俄罗斯方块形状的课程。

package tetris6;

import java.awt.Color;
import java.awt.Graphics2D;

public class Shape {

    public static void main () {


    }

    //Creating the tetris shapes and the rotated shapes    

public static Graphics2D O(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.yellow);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(30,30,30,30);

  return tetrisShape;
}

public static Graphics2D T_up(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.magenta);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(60,30,30,30);

  return tetrisShape;
}

public static Graphics2D T_right(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.magenta);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(0,60,30,30);
  tetrisShape.fillRect(30,30,30,30);

  return tetrisShape;
}

public static Graphics2D T_left(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.magenta);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(30,60,30,30);

  return tetrisShape;
}

public static Graphics2D T_down(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.magenta);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(60,0,30,30);
  tetrisShape.fillRect(30,30,30,30);

  return tetrisShape;
}

public static Graphics2D I_vertical(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.cyan);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(0,60,30,30);
  tetrisShape.fillRect(0,90,30,30);

  return tetrisShape;
}

public static Graphics2D I_horizontal(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.cyan);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(60,0,30,30);
  tetrisShape.fillRect(90,0,30,30);

  return tetrisShape;
}

public static Graphics2D S_horizontal(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.red);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(60,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(30,30,30,30);

  return tetrisShape;
}

public static Graphics2D S_vertical(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.red);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(30,60,30,30);

  return tetrisShape;
}

public static Graphics2D Z_horizontal(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.green);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(60,30,30,30);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(30,0,30,30);

  return tetrisShape;
}

public static Graphics2D Z_vertical(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.green);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(0,60,30,30);

  return tetrisShape;
}

public static Graphics2D J_vertical_left(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.blue);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(30,60,30,30);
  tetrisShape.fillRect(0,60,30,30);

  return tetrisShape;
}

public static Graphics2D J_vertical_right(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.blue);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(0,60,30,30);
  tetrisShape.fillRect(30,0,30,30);

  return tetrisShape;
}

public static Graphics2D J_horizontal_up(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.blue);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(60,30,30,30);
  tetrisShape.fillRect(0,0,30,30);

  return tetrisShape;
}

public static Graphics2D J_horizontal_down(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.blue);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(60,0,30,30);
  tetrisShape.fillRect(60,30,30,30);

  return tetrisShape;
}

public static Graphics2D L_vertical_right(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.orange);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(0,60,30,30);
  tetrisShape.fillRect(30,60,30,30);

  return tetrisShape;
}

public static Graphics2D L_vertical_left(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.orange);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(30,60,30,30);

  return tetrisShape;
}

public static Graphics2D L_horizontal_up(Graphics2D tetrisShape)
{
  tetrisShape.setColor(Color.orange);
  tetrisShape.fillRect(60,0,30,30);
  tetrisShape.fillRect(0,30,30,30);
  tetrisShape.fillRect(30,30,30,30);
  tetrisShape.fillRect(60,30,30,30);

  return tetrisShape;
}

public static Graphics2D L_horizontal_down(Graphics2D tetrisShape)
{

  tetrisShape.setColor(Color.orange);
  tetrisShape.fillRect(0,0,30,30);
  tetrisShape.fillRect(30,0,30,30);
  tetrisShape.fillRect(60,0,30,30);
  tetrisShape.fillRect(0,30,30,30);

  return tetrisShape;
}

//finished creating the tetrominoes

}

这是我试图将矩形绘制到JPanel中的类。

package tetris6;

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;

/**
 *
 */
public class GamePanel extends JPanel {

    public void paintComponent (Graphics g) {

        super.paintComponent(g);

        //set the panel to overlap the game grid
        setBounds(0,50,400,625);
        //draw the tetris shape at the top middle of the grid
        g.setColor(Color.yellow);
        g.fillRect(160, 0, 80, 80);

        setVisible(true);



    }

}

1 个答案:

答案 0 :(得分：0)

如果你没有合理的理由，请避免使用setLayout（null）。删除以下代码。将显示矩形。

如果仍需使用空布局，则必须设置组件的宽度和高度，以及其x和y位置。在你的tetris6类中删除setLayout（null）; 

   JFrame frame = new JFrame();
   //frame.setLayout(null);   // remove this line.
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