COM6516-Week10

MyFrame.java
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import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class MyFrame extends JFrame implements ActionListener {
private MyPanel drawingPanel;

private MyFrame() {
int width = (int) (Toolkit.getDefaultToolkit().getScreenSize().getWidth() / 2.0);
int height = (int) (width / 16.0 * 9.0);
setSize(width, height);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);

//For better looks.
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception e) {
e.printStackTrace();
}

drawingPanel = new MyPanel();
drawingPanel.setPolygon(5);
Container contentPane = this.getContentPane();
contentPane.add(drawingPanel, BorderLayout.CENTER);

JPanel columnOfButtons = new JPanel(new GridLayout(8, 1));
ButtonGroup buttonGroup = new ButtonGroup();
for (int i = 3; i < 10; i++) {
makeRadioButton(columnOfButtons, String.valueOf(i), buttonGroup, this);
}

JButton exit = new JButton("Exit");
exit.addActionListener(this);
columnOfButtons.add(exit);

contentPane.add(columnOfButtons, BorderLayout.EAST);

setVisible(true);
}

public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(MyFrame::new);
}

private void makeRadioButton(JPanel p, String name, ButtonGroup group, ActionListener target) {
JRadioButton b = new JRadioButton(name);
group.add(b);
// add it to the specified JPanel and make the JPanel listen
p.add(b);
b.addActionListener(target);
}

public void actionPerformed(ActionEvent e) {
// Do the appropriate thing depending on which button is pressed.
// Use the getActionCommand() method to identify the button.
switch (e.getActionCommand()) {
case "Exit":
System.exit(0);
case "3":
drawingPanel.setPolygon(3);
break;
case "4":
drawingPanel.setPolygon(4);
break;
case "5":
drawingPanel.setPolygon(5);
break;
case "6":
drawingPanel.setPolygon(6);
break;
case "7":
drawingPanel.setPolygon(7);
break;
case "8":
drawingPanel.setPolygon(8);
break;
case "9":
drawingPanel.setPolygon(9);
break;
}
}

}
MyPanel.java
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/*
* Developed by Neo on 26/11/18 15:37.
* Last modified 17/11/17 14:21.
* Copyright (c) 2018. All rights reserved.
*/

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

public class MyPanel extends JPanel {
private int sides = 0;

void setPolygon(int sides) {
this.sides = sides;
this.repaint();
}

@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);

Graphics2D g2 = (Graphics2D) g;

g2.setColor(Color.RED);

// Make text and shapes appear smoother
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

if (sides == 0) sides = 5;
int[] x = new int[sides];
int[] y = new int[sides];

int width = getWidth();
int height = getHeight();

int r = (width > height ? height : width) / 3;

for (int i = 0; i < sides; i++) {
x[i] = (int) (width / 2 + r * Math.cos(2 * Math.PI / sides * i));
y[i] = (int) (height / 2 + r * Math.sin(2 * Math.PI / sides * i));
}
Shape shape = new Polygon(x, y, sides);

g2.draw(shape);
}
}
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