Complete Chapter 12 Lab Assignment 12.12 and Chapter 13 Lab Assignment 13.9. The

Question

Complete Chapter 12 Lab Assignment 12.12 and Chapter 13 Lab Assignment 13.9. The Convert.java and Triangles.java classes are provided. You will need to complete the ConvertFrame.java and TrianglesPanel.java classes.

// Exercise 12.12 : Convert.java

//Temperature-conversion program

import javax.swing.JFrame;

public class Convert{

public static void main(String[] args) {

ConvertFrame convertFrame = new ConvertFrame();

convertFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

convertFrame.setSize(225, 90); // set frame size

convertFrame.setVisible(true); // display frame

}

} // end class Convert

// Exercise 12.12 : ConvertFrame.java

// Temperature-conversion program

import java.awt.BorderLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class ConvertFrame extends JFrame {

private JLabel prompt;

// label to prompt user to enter Fahrenheit

// label to display temperature in Celsius   

// textfield to enter temperature

// constructor sets up GUI

public ConvertFrame() {   

//prompt to enter Fahrenheit temperature

// textfield for Fahrenheit

// register anonymous action listener

//get temperature, be user to parse value and convert to an integer

//calculate the celsius

//display celsius

//set border layouts

} // end ConvertFrame constructor

} // end class ConvertFrame

----------------------------------------------------------------------------------------------------------------------------------------------------

// Exercise 13.9 : Triangles.java

// Displays randomly generated triangles in different colors.

import javax.swing.JFrame;
public class Triangles{

public static void main(String args[]) {

// create frame for TrianglesJPanel

JFrame frame = new JFrame("Drawing Triangles");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

TrianglesJPanel trianglesJPanel = new TrianglesJPanel();  

frame.add(trianglesJPanel); // add trianglesJPanel to frame

frame.setSize(400, 400); // set frame size

frame.setVisible(true); // display frame

}

} // end class Triangles

// Exercise 13.9: TrianglesJPanel.java

// Displays randomly generated triangles in different colors.

import java.awt.Color;

import java.awt.geom.GeneralPath;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.util.Random;

import javax.swing.JPanel;

public class TrianglesJPanel extends JPanel{

// random-number generator   

// constructor sets background

public TrianglesJPanel() {

// set JPanel background color

}
// draw ten triangles

public void paintComponent(Graphics g) {

super.paintComponent(g);

// cast graphics object
// create a triangle from three random points

// create the object which will be the triangle   

// min distance between triangle and top/left

// size of area triangle appears in
// use method moveTo to start the triangle   
// draw a line to the second point   
// draw a line to the third point   
   // draw a line back to the initial point
// choose a random color
// color the interior of the triangle

}

}

} // end class TrianglesJPanel

Explanation / Answer

13.9

package drawtriangleusingline2d;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.geom.Line2D;
import java.util.Random;

public class DrawTriangleUsingLine2D extends JApplet {
public void init() {
setBackground(Color.lightGray);
}
public void paint(Graphics g) {
Random r = new Random();
int x1 = r.nextInt((50-1)+1)+1;
int x2 = r.nextInt((150-1)+1)+1;
int y1 = r.nextInt((150-1)+1)+1;
int y2 = r.nextInt((150-1)+1)+1;
int y11 = r.nextInt((50-1)+1)+1;
int x22 = r.nextInt((50-1)+1)+1;
  
Graphics2D g2d = (Graphics2D) g;
g2d.setPaint(Color.red);
g2d.draw(new Line2D.Double(x1,y1,x2,y2 ));
g2d.draw(new Line2D.Double(50,y11,150,150 ));
g2d.draw(new Line2D.Double(50,50,x22,150 ));
}
public static void main(String s[]) {
JFrame frame = new JFrame("Show Triangle");
JApplet applet = new DrawTriangleUsingLine2D();
frame.getContentPane().add("Center", applet);
applet.init();
frame.setSize(500, 550);
frame.show();
}
}

12.12:

package fahrenheitgui;

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

public class FahrenheitGUI {
private int WIDTH = 300;
private int HEIGHT = 75;
private JFrame frame;
private JPanel panel;
private JLabel inputLabel, resultLabel;
private JTextField fahrenheit;

//-----------------------------------------------------------------
// Sets up the GUI.
//-----------------------------------------------------------------

public FahrenheitGUI() {
frame = new JFrame("Temperature Conversion");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

inputLabel = new JLabel("Enter Fahrenheit temperature:");
JLabel outputLabel = new JLabel("Temperature in Celsius: ");
resultLabel = new JLabel("---");

fahrenheit = new JTextField(5);
fahrenheit.addActionListener(new TempListener());

panel = new JPanel();
panel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
panel.setBackground(Color.yellow);
panel.add(inputLabel);
panel.add(fahrenheit);
panel.add(outputLabel);
panel.add(resultLabel);

frame.getContentPane().add(panel);

}

//-----------------------------------------------------------------
// Displays the primary application frame.
//-----------------------------------------------------------------

public void display() {
frame.pack();
frame.setVisible(true);

}

//*****************************************************************
// Represents an action listener for the temperature input field.
//*****************************************************************

private class TempListener implements ActionListener {
//--------------------------------------------------------------
// Performs the conversion when the enter key is pressed in
// the text field.
//--------------------------------------------------------------

public void actionPerformed(ActionEvent event) {
int fahrenheitTemp, celsiusTemp;

String text = fahrenheit.getText();

fahrenheitTemp = Integer.parseInt(text);
celsiusTemp = (fahrenheitTemp - 32) * 5 / 9;

resultLabel.setText(Integer.toString(celsiusTemp));
}
}
public static void main(String args[]){
FahrenheitGUI fh = new FahrenheitGUI();
fh.display();
  
}
}

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