Java - 如何绘制虚线和波浪线？

Question

我想在java中绘制虚线和波浪线。我可以使用 Graphics 和 g.drawLine() 方法绘制普通线条。有没有一种简单的方法可以在Graphics2D或类似的东西中绘制虚线和波浪线？

现在，我使用 MouseListener 的坐标绘制线条。所以它有点像 MS Paint。

Answer 1

虚线，as presented by Kevin Workman:

 public void drawDashedLine(Graphics g, int x1, int y1, int x2, int y2){

            //creates a copy of the Graphics instance
            Graphics2D g2d = (Graphics2D) g.create();

            Stroke dashed = new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{9}, 0);
            g2d.setStroke(dashed);
            g2d.drawLine(x1, y1, x2, y2);

            //gets rid of the copy
            g2d.dispose();
    }

您可以像这样创建虚线。

波浪线，as presented by Tiger:

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

public class CurveDraw extends JFrame {
        public static void main(String[] args) {
                CurveDraw frame = new CurveDraw();
                frame.setVisible(true);
        }
        public CurveDraw() {
                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                setSize(400,400);
        }
        public void paint(Graphics g) {
                QuadCurve2D.Double curve = new QuadCurve2D.Double(50,100,100,170,150,100);
                ((Graphics2D)g).draw(curve);
        }
}

Docs.oracle to learn more about Swing <强> wavy line

<强> Curvy line

<强> Docs.oracle to learn more about Swing