Question

我试图画一个简单的矩形，但它不会起作用。我在paintComponent中的sout告诉我它在paintComponent中。我已经用谷歌搜索了几个小时，但我无法找到我做错的事情。 paintComponent在一个扩展JComponent的类中，应该如此。我调用super.paintComponent（g），而不是super.paintComponent s （g）和soo。我错过了什么？

import java.awt.*;
import javax.swing.*;
public class Board extends JComponent{
    private GameCreator game;
    public Board(GameCreator game)
    {
        this.game = game;
    }

    @Override
    public void paintComponent (Graphics g){
        super.paintComponent(g);
        g.fillRect(50,50,300,300);
        g.setColor(Color.orange);
        System.out.println("inside piantComponent");
    }

    public static void main(String[]args)
    {
        GameCreator game = new GameCreator(8,10);
        game.prepareBoard();
        Board board = new Board(game);
        new Frame("test", board);
    }
}




import javax.swing.*;
import java.awt.*;
public class Frame extends JFrame {
    Board board;
    JPanel gamePanel;

    public Frame(String title, Board board) {
        super(title);
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(800, 800));
        pack();
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        this.board = board;
        gamePanel = new JPanel();
        gamePanel.add(board);
        setContentPane(gamePanel);

    }
}

Answer 1

你的电路板没有尺寸。使用setPrefferedSize设置它。你还必须在fillRect之前调用g.setColor。

java paintComponent（图形g）不起作用

1 个答案: