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872天前import java.awt.*; |
import java.awt.event.*; |
import java.applet.*; |
public class ArcTest extends Applet implements WindowListener { |
ArcControls controls; |
public void init() { // Applet的入口方法 |
setLayout(new BorderLayout()); |
ArcCanvas c = new ArcCanvas(); |
add("Center", c); |
add("South", controls = new ArcControls(c)); |
} |
public void start() { |
controls.setEnabled(true); // 激活controls |
} |
public void stop() { |
controls.setEnabled(false); |
} |
public void windowActivated(WindowEvent e) { |
} |
// 重写WindowListener的方法 |
public void windowClosed(WindowEvent e) { |
} |
// 重写WindowListener的方法 |
public void windowClosing(WindowEvent e) { |
// 重写WindowListener的方法 |
System.exit(0); |
} |
public void windowDeactivated(WindowEvent e) { |
} |
// 重写WindowListener的方法 |
public void windowDeiconified(WindowEvent e) { |
} |
// 重写WindowListener的方法 |
public void windowIconified(WindowEvent e) { |
} |
// 重写WindowListener的方法 |
public void windowOpend(WindowEvent e) { |
} |
// 重写WindowListener的方法 |
public static void main(String args[]) { |
Frame f = new Frame("ArcTest"); // 构造Frame |
ArcTest arcTest = new ArcTest(); // 构造arcTest |
arcTest.init(); |
arcTest.start(); |
f.add("Center", arcTest); |
f.setSize(300, 300); |
f.show(); |
f.addWindowListener(arcTest); |
} |
@Override |
public void windowOpened(WindowEvent arg0) { |
// TODO Auto-generated method stub |
} |
} |
class ArcCanvas extends Canvas { // 类ArcCanvas |
int startAngle = 0; |
int endAngle = 45; |
boolean filled = false; |
Font font; |
public void paint(Graphics g) { |
// paint方法，该方法的作用是在Canvas上画图 |
Rectangle r = getBounds(); |
int hlines = r.height / 10; |
int vlines = r.width / 10; |
g.setColor(Color.pink); |
for (int i = 1; i <= hlines; i++) { |
g.drawLine(0, i * 10, r.width, i * 10); |
} |
for (int i = 1; i <= vlines; i++) { |
g.drawLine(i * 10, 0, i * 10, r.height); |
} |
g.setColor(Color.red); |
if (filled) { |
g.fillArc(0, 0, r.width - 1, r.height - 1, startAngle, endAngle); |
} else { |
g.drawArc(0, 0, r.width - 1, r.height - 1, startAngle, endAngle); |
} |
g.setColor(Color.black); |
g.setFont(font); |
g.drawLine(0, r.height / 2, r.width, r.height / 2); |
g.drawLine(r.width / 2, 0, r.width / 2, r.height); |
g.drawLine(0, 0, r.width, r.height); |
g.drawLine(r.width, 0, 0, r.height); |
int sx = 10; |
int sy = r.height - 28; |
g.drawString("S=" + startAngle, sx, sy); |
g.drawString("E=" + endAngle, sx, sy + 14); |
} |
public void redraw(boolean filled, int start, int end) { // 重画方法 |
this.filled = filled; |
this.startAngle = start; |
this.endAngle = end; |
repaint(); |
// 通过调用repaint()方法，从而最终调用paint方法完成重画 |
} |
} |
class ArcControls extends Panel implements ActionListener { // ArcControls类 |
TextField s; |
TextField e; |
ArcCanvas canvas; |
public ArcControls(ArcCanvas canvas) { |
Button b = null; |
this.canvas = canvas; |
add(s = new TextField("0", 4)); |
add(e = new TextField("45", 4)); |
b = new Button("Fill"); |
b.addActionListener(this); |
add(b); |
b = new Button("Draw"); |
b.addActionListener(this); |
add(b); |
} |
public void actionPerformed(ActionEvent ev) { |
// 实现接口ActionListener的方法 |
String label = ev.getActionCommand(); |
canvas.redraw(label.equals("Fill"), |
Integer.parseInt(s.getText().trim()), |
Integer.parseInt(e.getText().trim())); |
} |
} |
