Here is a demo code. Enjoy it.
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.font.TextLayout;
import java.awt.font.FontRenderContext;
import javax.swing.*;
/**
* Various shapes stroked with a dashing pattern.
*/
public class Dash extends JApplet { public void init() {
setBackground(Color.white);
}
public void drawDemo(int w, int h, Graphics2D g2) { FontRenderContext frc = g2.getFontRenderContext();
Font font = g2.getFont();
TextLayout tl = new TextLayout("Dashes", font, frc);
float sw = (float) tl.getBounds().getWidth();
float sh = (float) tl.getAscent() + tl.getDescent();
g2.setColor(Color.black);
tl.draw(g2, (float) (w/2-sw/2), sh+5);
BasicStroke dotted = new BasicStroke(3, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND, 0, new float[]{0,6,0,6}, 0);
g2.setStroke(dotted);
g2.drawRect(3,3,w-6,h-6); int x = 0; int y = h-34;
BasicStroke bs[] = new BasicStroke[6]; float j = 1.1f;
for (int i = 0; i < bs.length; i++, j += 1.0f) {
float dash[] = { j };
BasicStroke b = new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
g2.setStroke(b);
g2.drawLine(20, y, w-20, y);
bs[i] = new BasicStroke(3.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
y += 5;
} Shape shape = null;
y = 0;
for (int i = 0; i < 6; i++) {
x = (i == 0 || i == 3) ? (w/3-w/5)/2 : x + w/3;
y = (i <= 2) ? (int) sh+h/12 : h/2; g2.setStroke(bs[i]);
g2.translate(x, y);
switch (i) {
case 0 : shape = new Arc2D.Float(0.0f, 0.0f, w/5, h/4, 45, 270, Arc2D.PIE);
break;
case 1 : shape = new Ellipse2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 2 : shape = new RoundRectangle2D.Float(0.0f, 0.0f, w/5, h/4, 10.0f, 10.0f);
break;
case 3 : shape = new Rectangle2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 4 : shape = new QuadCurve2D.Float(0.0f,0.0f,w/10, h/2,w/5,0.0f);
break;
case 5 : shape = new CubicCurve2D.Float(0.0f,0.0f,w/15,h/2, w/10,h/4,w/5,0.0f);
break;
} g2.draw(shape);
g2.translate(-x, -y);
}
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
g2.setBackground(getBackground());
g2.clearRect(0, 0, d.width, d.height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawDemo(d.width, d.height, g2);
}
public static void main(String argv[]) {
final Dash demo = new Dash();
demo.init();
JFrame f = new JFrame("Java 2D(TM) Demo - Dash");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
f.getContentPane().add("Center", demo);
f.pack();
f.setSize(new Dimension(400,300));
f.show();
}
}HTML file looks like:<html>
<head>
<title>Java 2D(TM) Demo Dash</title>
</head> <body>
<applet code=Dash.class width=400 height=300>
</applet>
</body>
</html>
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.font.TextLayout;
import java.awt.font.FontRenderContext;
import javax.swing.*;
/**
* Various shapes stroked with a dashing pattern.
*/
public class Dash extends JApplet { public void init() {
setBackground(Color.white);
}
public void drawDemo(int w, int h, Graphics2D g2) { FontRenderContext frc = g2.getFontRenderContext();
Font font = g2.getFont();
TextLayout tl = new TextLayout("Dashes", font, frc);
float sw = (float) tl.getBounds().getWidth();
float sh = (float) tl.getAscent() + tl.getDescent();
g2.setColor(Color.black);
tl.draw(g2, (float) (w/2-sw/2), sh+5);
BasicStroke dotted = new BasicStroke(3, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND, 0, new float[]{0,6,0,6}, 0);
g2.setStroke(dotted);
g2.drawRect(3,3,w-6,h-6); int x = 0; int y = h-34;
BasicStroke bs[] = new BasicStroke[6]; float j = 1.1f;
for (int i = 0; i < bs.length; i++, j += 1.0f) {
float dash[] = { j };
BasicStroke b = new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
g2.setStroke(b);
g2.drawLine(20, y, w-20, y);
bs[i] = new BasicStroke(3.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f);
y += 5;
} Shape shape = null;
y = 0;
for (int i = 0; i < 6; i++) {
x = (i == 0 || i == 3) ? (w/3-w/5)/2 : x + w/3;
y = (i <= 2) ? (int) sh+h/12 : h/2; g2.setStroke(bs[i]);
g2.translate(x, y);
switch (i) {
case 0 : shape = new Arc2D.Float(0.0f, 0.0f, w/5, h/4, 45, 270, Arc2D.PIE);
break;
case 1 : shape = new Ellipse2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 2 : shape = new RoundRectangle2D.Float(0.0f, 0.0f, w/5, h/4, 10.0f, 10.0f);
break;
case 3 : shape = new Rectangle2D.Float(0.0f, 0.0f, w/5, h/4);
break;
case 4 : shape = new QuadCurve2D.Float(0.0f,0.0f,w/10, h/2,w/5,0.0f);
break;
case 5 : shape = new CubicCurve2D.Float(0.0f,0.0f,w/15,h/2, w/10,h/4,w/5,0.0f);
break;
} g2.draw(shape);
g2.translate(-x, -y);
}
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
g2.setBackground(getBackground());
g2.clearRect(0, 0, d.width, d.height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawDemo(d.width, d.height, g2);
}
public static void main(String argv[]) {
final Dash demo = new Dash();
demo.init();
JFrame f = new JFrame("Java 2D(TM) Demo - Dash");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
f.getContentPane().add("Center", demo);
f.pack();
f.setSize(new Dimension(400,300));
f.show();
}
}HTML file looks like:<html>
<head>
<title>Java 2D(TM) Demo Dash</title>
</head> <body>
<applet code=Dash.class width=400 height=300>
</applet>
</body>
</html>
BasicStroke bs = new BasicStroke(5.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f);
g2.setStroke(bs);
Line2D line = new Line2D.Float(20.0f, 10.0f, 100.0f, 10.0f);
g2.draw(line);
//定义虚线样式
float[] dash2 = {6.0f, 4.0f, 2.0f, 4.0f, 2.0f, 4.0f};
bs = new BasicStroke(5.0f, BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER, 10.0f, dash2, 0.0f);
g2.setStroke(bs);
g2.draw(line);
运行一下代码就知道了如何定义。