Java Graphics - 如何绘制虚线风格线

 


import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;

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

public class LinesDashes1 extends JPanel {

  public void paintComponent(Graphics g) {
    super.paintComponent(g);

    Graphics2D g2d = (Graphics2D) g;

    float[] dash1 = { 2f, 0f, 2f };

    g2d.drawLine(20, 40, 250, 40);

    BasicStroke bs1 = new BasicStroke(1, 
        BasicStroke.CAP_BUTT, 
        BasicStroke.JOIN_ROUND, 
        1.0f, 
        dash1,
        2f);
    //BasicStroke bs2 = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND, 1.0f, dash2,2f);
    //float[] dash3 = { 4f, 0f, 2f };
    //BasicStroke bs3 = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND, 1.0f, dash3,2f);
    
    //float[] dash4 = { 4f, 4f, 1f };
    //BasicStroke bs4 = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND, 1.0f, dash4,2f);

    g2d.setStroke(bs1);
    g2d.drawLine(20, 80, 250, 80);

  }

  public static void main(String[] args) {
    LinesDashes1 lines = new LinesDashes1();
    JFrame frame = new JFrame("Lines");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(lines);
    frame.setSize(280, 270);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);

  }
}