House assignment.

This program has a method to draw a house based on the user's specifications.

• Adapt the drawHouse method so that it draws something else.
• The something else should have polygons, rectangles or ovals and your own colours.
• When finished, your drawing should move around the screen and get bigger or smaller as the current house does.

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

/**
* Draws a house on the screen, allows the user to move and scale it
* @author (Gorski)
* @version (July 2, 2003)
*/
public class House extends Applet implements ActionListener
{

//Widgets, Panels
JButton draw;
JLabel lx, ly, lxscale, lyscale;
JTextField tx, ty, txscale, tyscale;
Panel flow;
//House Coordinates, initialized to 1. (Top Right and No Scaling)
int x = 1;
int y = 1;
int xz = 1;
int yz = 1;

public void init ()
{ //Set Up Input Fields for House Coordinates
lx = new JLabel ("x co-ord:");
ly = new JLabel ("y co-ord:");
lxscale = new JLabel ("x scaling factor:");
lyscale = new JLabel ("y scaling factor:");
tx = new JTextField ("1", 2);
ty = new JTextField ("1", 2);
txscale = new JTextField ("1", 2);
tyscale = new JTextField ("1", 2);

//Set up draw button and actionlistener
draw = new JButton ("Draw");
draw.addActionListener (this);
draw.setActionCommand ("draw");

//Set up layout, add widgets
setLayout (new BorderLayout ());
flow = new Panel (new FlowLayout ());
flow.add (lx);
flow.add (tx);
flow.add (ly);
flow.add (ty);
flow.add (lxscale);
flow.add (txscale);
flow.add (lyscale);
flow.add (tyscale);
flow.add (draw);
flow.setBackground (Color.red);
add (flow, "South");
resize (600, 500);
}

public void paint (Graphics g)
{ //draw a white box over the background to erase everything
g.setColor (Color.white);
g.fillRect (0, 0, 600, 500);
//draw the house passing in the global variables
littlehouse (x, y, xz, yz);
//used only to force an update
showStatus ("Done Drawing House");
}

/** Draws a little house
* @param x is the top x co-ordinate of the house
* @param y is the left most y co-ordinate of the house
* @param xz is the x scaling factor, stretches horizontally
* @param yz is the y scaling factor, stretches vertically
*/
public void littlehouse (int x, int y, int xz, int yz)
{
Color lightgreen = new Color (0, 255, 128);
Color lightorange = new Color (253, 201, 123);
Graphics g = getGraphics ();

x = x / xz; //reset top based on scaling factor
y = y / yz; //reset right coordinate based on scaling factor

//green box
g.setColor (lightgreen);
g.fillRect ((x + 18) * xz, (y + 34) * yz, 84 * xz, 37 * yz);
g.setColor (Color.black);
g.drawRect ((x + 18) * xz, (y + 34) * yz, 84 * xz, 37 * yz);
//windows
g.setColor (Color.white);
g.fillRect ((x + 23) * xz, (y + 45) * yz, 23 * xz, 12 * yz);
g.fillRect ((x + 74) * xz, (y + 45) * yz, 23 * xz, 12 * yz);
g.setColor (Color.black);
g.drawRect ((x + 23) * xz, (y + 45) * yz, 23 * xz, 12 * yz);
g.drawRect ((x + 74) * xz, (y + 45) * yz, 23 * xz, 12 * yz);
//door
g.setColor (Color.yellow);
g.fillRect ((x + 53) * xz, (y + 45) * yz, 15 * xz, 26 * yz);
g.setColor (Color.black);
g.drawRect ((x + 53) * xz, (y + 45) * yz, 15 * xz, 26 * yz);
//roof
g.setColor (lightorange);
int X [] = { (x + 6) * xz, (x + 113) * xz, (x + 60) * xz, (x + 6) * xz};
int Y [] = { (y + 34) * yz, (y + 34) * yz, (y + 12) * yz, (y + 34) * yz};
g.fillPolygon (X, Y, 4);
g.setColor (Color.black);
g.drawPolygon (X, Y, 4);
}

/**
Draw a new little house or clears the textfields
@param e The ActionEvent invoked. e.getActionCommand contains nothing or draw
*/
public void actionPerformed (ActionEvent e)
{
//get new co-ordinates and draw the house
if (e.getActionCommand ().equals ("draw"))
{
showStatus ("");
try
{
x = Integer.parseInt (tx.getText ());
y = Integer.parseInt (ty.getText ());
xz = Integer.parseInt (txscale.getText ());
if (xz <= 0)
xz = 1; //divide by zero, negative error check
yz = Integer.parseInt (tyscale.getText ());
if (yz <= 0)
yz = 1; //divide by zero, negative error check
repaint ();

}
catch (java.lang.NumberFormatException error)
{ //if the user entered text, display an error message and clear the textfield
showStatus ("Enter NUMBERS in the text fields. eg. 2. No decimals.");
tx.setText ("1");
ty.setText ("1");
txscale.setText ("1");
tyscale.setText ("1");
}

}

}
}