Question

Design a Program “Shape Factory” that has Buttons to produce: a. Random Rectangles with random colors. b. Random Ellipses with random colors. c. Random Lines with random colors. Whenever user clicks on a button, the corresponding shape will be added to the already drawn shapes in the Canvas

(java)

Answer 1

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

public class ShapeFactory extends JFrame implements ActionListener{

public static void main(String[] args) {
new ShapeFactory();
}
public int numberOfRects;
public int numberOfEllis;
public int numberOfLines;
JButton ranRects = new JButton("Random Rectangles");
JButton ranElli = new JButton("Random Ellipses");
JButton ranLines = new JButton("Random Lines");
Graphics g;
Color c;
ArrayList shapeList = new ArrayList( );

public ShapeFactory(){
super("Shape Factory");
setLayout(new FlowLayout());
setSize(600,400);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

add(ranRects);
add(ranElli);
add(ranLines);

JPanel nPanel = new JPanel (new GridLayout(1,3));
nPanel.add(ranRects);
nPanel.add(ranElli);
nPanel.add(ranLines);

add(nPanel);

ranRects.addActionListener(this);

ranElli.addActionListener(this);

ranLines.addActionListener(this);

setVisible(true);
}

public void paint (Graphics g) {

super.paint(g);

super.paint(g);
for (int i = 0; i < this.numberOfRects; i++)
paintRect(g);
for (int i = 0; i < this.numberOfEllis; i++)
paintOval(g);
for (int i = 0; i < this.numberOfLines; i++)
this.paintLine(g);
}

public void paintRect(Graphics g) {

int rectX1 = (int)(Math.random() * getWidth() / 4.0);
int rectY1 = (int)(Math.random() * getHeight()/ 4.0);
int rectX2 = (int)(Math.random() * getWidth());
int rectY2 = (int)(Math.random() * getHeight());
c = new Color( (int) (Math.random() * 255) , (int) (Math.random() * 255) , (int) (Math.random() * 255));
g.setColor(c);
g.fillRect(rectX1,rectY2,rectX2,rectY2);
}
public void paintOval(Graphics g) {

int ciX1 = (int)(Math.random() * getWidth() / 4.0);
int ciY1 = (int)(Math.random() * getHeight()/ 4.0);
int ciX2 = (int)(Math.random() * getWidth());
int ciY2 = (int)(Math.random() * getHeight());
c = new Color( (int) (Math.random() * 255) , (int) (Math.random() * 255) , (int) (Math.random() * 255));
g.setColor(c);
g.fillOval(ciX1,ciY1,ciX2,ciY2);
}
public void paintLine(Graphics g) {

int lineX1 = (int)(Math.random() * getWidth() / 4.0);
int lineY1 = (int)(Math.random() * getHeight()/ 4.0);
int lineX2 = (int)(Math.random() * getWidth());
int lineY2 = (int)(Math.random() * getHeight());
c = new Color( (int) (Math.random() * 255) , (int) (Math.random() * 255) , (int) (Math.random() * 255));
g.setColor(c);
g.drawLine(lineX1,lineY1,lineX2,lineY2);
}

public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == ranRects) {
this.numberOfRects++;
} else if (source == ranElli) {
this.numberOfEllis++;
} else if (source == ranLines) {
this.numberOfLines++;
}
repaint();
}

}