为什么我的坐标与我的 JFrame 大小不匹配?

2022-01-24 00:00:00 java jframe

我想在 JPanel 中进行一些绘图，但封闭的 JFrame 大小似乎与我要求绘制坐标的位置不匹配.

I want to do some drawing in a JPanel but the enclosing JFrame size doesn't seem to match where I've asked the coordinates to be drawn.

在我的示例代码中，JFrame 大小设置为 (700, 700)，最后一个点绘制在 (600, 600).我希望这个点在距离右边缘和下边缘 100 像素处绘制，但事实并非如此(请看截图).

In my example code, the JFrame size is set to (700, 700) and the last point is drawn at (600, 600). I would expect this point to be drawn 100 pixels away from the right and bottom edges but it isn't (please see screenshot).

这是我正在使用的代码:

Here's the code I'm using:

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

public class Scratch extends JPanel {

    static int frameWidth = 700;
    static int frameHeight = 700;

    public static void main(String[] args) {

    JFrame frame = new JFrame();

    frame.setSize(frameWidth, frameHeight);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Scratch scratch = new Scratch();

    frame.getContentPane().add(scratch);
    
    frame.setVisible(true);

    }

    @Override
    public void paintComponent(Graphics g) {

    g.drawRect(100, 100, 1, 1);

    g.drawString("100", 100, 100);

    g.drawRect(200, 200, 1, 1);

    g.drawString("200", 200, 200);

    g.drawRect(300, 300, 1, 1);

    g.drawString("300", 300, 300);

    g.drawRect(400, 400, 1, 1);

    g.drawString("400", 400, 400);

    g.drawRect(500, 500, 1, 1);

    g.drawString("500", 500, 500);

    g.drawRect(600, 600, 1, 1);

    g.drawString("600", 600, 600);


    }

}

推荐答案

只是猜测:

public class Scratch extends JPanel {

    static int frameWidth = 700;
    static int frameHeight = 700;

    public static void main(String[] args) {

    JFrame frame = new JFrame();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Scratch scratch = new Scratch();
    scratch.setSize(frameWidth, frameHeight);

    frame.getContentPane().add(scratch);

    frame.pack();
    frame.setVisible(true);

    }

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