java中的链接2 Oval

Question

我正在键入链接到带有绘图行的圆圈，但我有一个问题，这里是我的代码：

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

public class Panneau extends JPanel {

public void paintComponent(Graphics g){
 // declaration 
                String text = "test";
                int x = 250, y = 200;
                int height = 50, width = 50;


                g.setColor(Color.yellow);
                g.fillOval(x-height/2, y-width/2,width, height);
g.fillOval((x-height/2)+100, (y-width/2)+50,width, height);

                FontMetrics fm = g.getFontMetrics();
                double textWidth = fm.getStringBounds(text, g).getWidth();
                g.setColor(Color.black);
                g.drawString(text, (int) (x - textWidth/2),(int) (y + fm.getMaxAscent() / 2));
            g.drawString(text, (int) (x - textWidth/2)+100,(int) (y + fm.getMaxAscent() / 2)+50);
            g.setColor(Color.black);
            g.drawLine(x,y,x+100,y+50);



}
}

问题是，我画的线是从圆心开始画的，我想从圆上画线(就像图节点！)(谢谢你的帮助！)

Answer 1

实际上，我意识到有一种方法可以通过绘制不同顺序的图形元素来“破解它”。这仍然画出了整条线，但是..drawing在上面有效地“擦除了不需要的比特”！

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

public class Panneau extends JPanel {

public void paintComponent(Graphics g){
    // declaration
    String text = "test";
    int x = 250, y = 200;
    int height = 50, width = 50;

    g.setColor(Color.black);
    g.drawLine(x,y,x+100,y+50);

    g.setColor(Color.yellow);
    g.fillOval(x-height/2, y-width/2,width, height);
    g.fillOval((x-height/2)+100, (y-width/2)+50,width, height);

    FontMetrics fm = g.getFontMetrics();
    double textWidth = fm.getStringBounds(text, g).getWidth();
    g.setColor(Color.black);
    g.drawString(text, (int) (x - textWidth/2),(int) (y + fm.getMaxAscent() / 2));
    g.drawString(text, (int) (x - textWidth/2)+100,(int) (y + fm.getMaxAscent() / 2)+50);
}

public Dimension getPreferredSize() {
    return new Dimension(400,280);
}

public static void main(String[] args) {
    Runnable r = new Runnable() {
        public void run() {
            Panneau p = new Panneau();
            JOptionPane.showMessageDialog(null, p);
        }
    };
    SwingUtilities.invokeLater(r);
}
}