Mega Code Archive
Area Calculation
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import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import javax.swing.ButtonGroup;
import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.TitledBorder;
public class TArea extends JApplet implements ActionListener {
DrawingCanvas canvas;
JRadioButton addButton, subtractButton, intersectButton, exclusiveORButton,
resetButton;
public static void main(String[] a) {
JFrame f = new JFrame();
TArea area = new TArea();
area.init();
f.getContentPane().add(area);
f.setDefaultCloseOperation(1);
f.setSize(650, 450);
f.setVisible(true);
}
public void init() {
Container container = getContentPane();
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 2));
resetButton = new JRadioButton("Reset", true);
addButton = new JRadioButton("Add");
subtractButton = new JRadioButton("Subtract");
intersectButton = new JRadioButton("Intersect");
exclusiveORButton = new JRadioButton("ExclusiveOR");
ButtonGroup group = new ButtonGroup();
group.add(resetButton);
group.add(addButton);
group.add(subtractButton);
group.add(intersectButton);
group.add(exclusiveORButton);
group.add(resetButton);
resetButton.addActionListener(this);
addButton.addActionListener(this);
subtractButton.addActionListener(this);
intersectButton.addActionListener(this);
exclusiveORButton.addActionListener(this);
panel.add(addButton);
panel.add(subtractButton);
panel.add(intersectButton);
panel.add(exclusiveORButton);
container.add(panel, BorderLayout.NORTH);
container.add(resetButton, BorderLayout.SOUTH);
canvas = new DrawingCanvas();
container.add(canvas);
}
class DrawingCanvas extends Canvas {
GeneralPath gp;
Ellipse2D ellipse;
Area area1, area2;
boolean drawFlag = true;
boolean fillFlag = false;
public DrawingCanvas() {
setBackground(Color.white);
setSize(350, 250);
int w = getWidth();
int h = getHeight();
gp = new GeneralPath();
gp.moveTo(w / 8, h / 2);
gp.lineTo(w / 2, h / 4);
gp.lineTo(7 * w / 8, h / 2);
gp.lineTo(w / 2, 3 * h / 4);
gp.closePath();
area1 = new Area(gp);
ellipse = new Ellipse2D.Double(w / 4, h / 4, w / 2, h / 2);
area2 = new Area(ellipse); // Ellipse area object
}
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
g2D.setStroke(new BasicStroke(2.0f));
if (drawFlag) {
g2D.draw(area1);
g2D.draw(area2);
}
if (fillFlag)
g2D.fill(area1);
}
}
public void actionPerformed(ActionEvent e) {
JRadioButton temp = (JRadioButton) e.getSource();
if (temp.equals(addButton)) {
canvas.area1 = new Area(canvas.gp);
canvas.area1.add(canvas.area2);
canvas.drawFlag = false;
canvas.fillFlag = true;
canvas.repaint();
} else if (temp.equals(subtractButton)) {
canvas.area1 = new Area(canvas.gp);
canvas.area1.subtract(canvas.area2);
canvas.drawFlag = false;
canvas.fillFlag = true;
canvas.repaint();
} else if (temp.equals(intersectButton)) {
canvas.area1 = new Area(canvas.gp);
canvas.area1.intersect(canvas.area2);
canvas.drawFlag = false;
canvas.fillFlag = true;
canvas.repaint();
} else if (temp.equals(exclusiveORButton)) {
canvas.area1 = new Area(canvas.gp);
canvas.area1.exclusiveOr(canvas.area2);
canvas.drawFlag = false;
canvas.fillFlag = true;
canvas.repaint();
} else if (temp.equals(resetButton)) {
if (canvas.drawFlag == false) {
canvas.area1 = new Area(canvas.gp);
canvas.drawFlag = true;
canvas.fillFlag = false;
canvas.repaint();
}
}
}
}
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