Question

Describe the following Java code. Give screenshots of the image it produces

public class main{

public static void main(String[] args{

new MyFrame();

}

}

import javax.swing.*;

public class MyFrame extends JFrame{

MyPanel panel;

MyFrame(){

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.add(panel);

this.pack();

this.setLocationRelativeTo(null);

this.setVisible(true);

}

}

import java.awt.*;

import.javax.swing.*;

public class MyPanel extends JPanel{

//Image Image;

MyPanel(){

//image=new ImageIcon("sky.png").getImage();

this.setPreferredSize(new Dimension(500,500));

}

public void paint(Graphics g){

Graphics2D g2D = (Graphics2D) g;

//g2D.drawImage(image,0,0,null);

g2D.setPaint(Color.blue);

g2D.setStroke(new BasicStroke(5));

g2D.drawLine(0,0,500,500);

//g2D.setPaint(Colo.pink);

//g2D.drawRect(0,0,100,200);

//g2D.fillRect(0,0,100,200);

//g2D.setPaint(Color.orange);

//g2D.drawOval(0,0,100,100);

//g2D.fillOval(0,0,100,100);

//g2D.setPaint(color.red);

//g2D.drawArc(0,0,100,100,0,180);

//g2D.fillArc(0,0,100,100,0,180);

//g2D.setPaint(Color.white);

//g2D.fillArc(0,0,100,100,180,180);

//int[] xPoints = {150,250,350};

//int[] yPoints={300,150,300};

//g2D.setPaint(Color.yellow);

//g2D.drawPolygon(xPoints,yPoints,3);

//g2D.fillPolygon(xPoints,yPoints,3);

//g2D.setPaint(Color.magenta);

//g2D.setFont(new Font("Ink Free",Font.BOLD,50));

//g2D.drawString("U R A WINNER!:",50,50);

}

}

Answer 1

MyPanel is the drawing program.

It draws the following shapes.

1. It draws a diagonal line from top left to bottom right. g2D.drawLine(0, 0, 500, 500);

2. A rectangle in top left corner. g2D.drawRect(0,0,100,200);

3. It creates a circle and fills with orange color. g2D.drawOval(0,0,100,100);

4. It creates a semi-circle inside the circle with white color. g2D.fillArc(0,0,100,100,180,180);

5. It creates a triangle by drawing a polygon with 3 sides. g2D.drawPolygon(xPoints,yPoints,3);

6. All the images are placed in a sky background.

Following is the output of the program.

Following is the modified MyFrame.java

import javax.swing.*;

public class MyFrame extends JFrame {

   MyPanel panel = new MyPanel();

   MyFrame() {

       this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       this.add(panel);

       this.pack();

       this.setLocationRelativeTo(null);

       this.setVisible(true);

   }

}

Following is the modified MyPanel.java

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.*;

public class MyPanel extends JPanel {

java.awt.Image image;

   MyPanel() {

image=new ImageIcon("sky.png").getImage();

       this.setPreferredSize(new Dimension(500, 500));

   }

   public void paint(Graphics g) {

       Graphics2D g2D = (Graphics2D) g;

g2D.drawImage(image,0,0,null);

       g2D.setPaint(Color.blue);

       g2D.setStroke(new BasicStroke(5));

       g2D.drawLine(0, 0, 500, 500);

g2D.setPaint(Color.pink);

g2D.drawRect(0,0,100,200);

g2D.fillRect(0,0,100,200);

g2D.setPaint(Color.orange);

g2D.drawOval(0,0,100,100);

g2D.fillOval(0,0,100,100);

g2D.setPaint(Color.red);

g2D.drawArc(0,0,100,100,0,180);

g2D.fillArc(0,0,100,100,0,180);

g2D.setPaint(Color.white);

g2D.fillArc(0,0,100,100,180,180);

int[] xPoints = {150,250,350};

int[] yPoints={300,150,300};

g2D.setPaint(Color.yellow);
g2D.drawPolygon(xPoints,yPoints,3);

g2D.fillPolygon(xPoints,yPoints,3);

g2D.setPaint(Color.magenta);

//g2D.setFont(new Font("Ink Free",Font.BOLD,50));

g2D.drawString("U R A WINNER!:",50,50);

   }

}