Class yang dibutuhkan:
- Picture (untuk menampilkan gambar rumahnya)
- Canvas (media untuk menggambar)
- Circle (bentuk gambar lingkaran)
- Square (bentuk gambar persegi)
- Triangle (untuk gambar segitiga)
Lalu ini adalah source code yang telah dibuat:
- Picture
public class Picture
{
private Square wall;
private Square grass;
private Circle grass2;
private Square window;
private Square door;
private Triangle roof;
private Circle sun;
private Square tree;
private Circle tree2;
/**
* Constructor for objects of class Picture
*/
public Picture()
{
// nothing to do... instance variables are automatically set to null
}
/**
* Draw this picture.
*/
public void draw()
{
wall = new Square();
wall.moveHorizontal(-250);
wall.moveVertical(120);
wall.changeSize(200);
wall.makeVisible();
tree = new Square();
tree.changeColor("black");
tree.moveHorizontal(25);
tree.moveVertical(220);
tree.changeSize(60);
tree.makeVisible();
tree = new Square();
tree.changeColor("black");
tree.moveHorizontal(25);
tree.moveVertical(160);
tree.changeSize(60);
tree.makeVisible();
tree2 = new Circle();
tree2.changeColor("green");
tree2.moveHorizontal(62);
tree2.moveVertical(76);
tree2.changeSize(150);
tree2.makeVisible();
door = new Square();
door.changeColor("green");
door.moveHorizontal(-175);
door.moveVertical(270);
door.changeSize(50);
door.makeVisible();
door = new Square();
door.changeColor("green");
door.moveHorizontal(-175);
door.moveVertical(250);
door.changeSize(50);
door.makeVisible();
grass = new Square();
grass.changeColor("green");
grass.moveHorizontal(-50);
grass.moveVertical(270);
grass.changeSize(50);
grass.makeVisible();
grass = new Square();
grass.changeColor("green");
grass.moveHorizontal(0);
grass.moveVertical(270);
grass.changeSize(50);
grass.makeVisible();
grass = new Square();
grass.changeColor("green");
grass.moveHorizontal(50);
grass.moveVertical(270);
grass.changeSize(50);
grass.makeVisible();
grass = new Square();
grass.changeColor("green");
grass.moveHorizontal(100);
grass.moveVertical(270);
grass.changeSize(50);
grass.makeVisible();
grass = new Square();
grass.changeColor("green");
grass.moveHorizontal(150);
grass.moveVertical(270);
grass.changeSize(50);
grass.makeVisible();
grass2 = new Circle();
grass2.changeColor("green");
grass2.moveHorizontal(29);
grass2.moveVertical(279);
grass2.changeSize(50);
grass2.makeVisible();
grass2 = new Circle();
grass2.changeColor("green");
grass2.moveHorizontal(79);
grass2.moveVertical(279);
grass2.changeSize(50);
grass2.makeVisible();
grass2 = new Circle();
grass2.changeColor("green");
grass2.moveHorizontal(129);
grass2.moveVertical(279);
grass2.changeSize(50);
grass2.makeVisible();
grass2 = new Circle();
grass2.changeColor("green");
grass2.moveHorizontal(179);
grass2.moveVertical(279);
grass2.changeSize(50);
grass2.makeVisible();
grass2 = new Circle();
grass2.changeColor("green");
grass2.moveHorizontal(229);
grass2.moveVertical(279);
grass2.changeSize(50);
grass2.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-225);
window.moveVertical(150);
window.changeSize(25);
window.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-199);
window.moveVertical(150);
window.changeSize(25);
window.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-199);
window.moveVertical(178);
window.changeSize(25);
window.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-225);
window.moveVertical(178);
window.changeSize(25);
window.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-125);
window.moveVertical(150);
window.changeSize(25);
window.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-99);
window.moveVertical(178);
window.changeSize(25);
window.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-99);
window.moveVertical(150);
window.changeSize(25);
window.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(-125);
window.moveVertical(178);
window.changeSize(25);
window.makeVisible();
roof = new Triangle();
roof.changeColor("blue");
roof.changeSize(80, 220);
roof.moveHorizontal(-50);
roof.moveVertical(20);
roof.makeVisible();
sun = new Circle();
sun.changeColor("yellow");
sun.moveHorizontal(10);
sun.moveVertical(-40);
sun.changeSize(80);
sun.makeVisible();
}
}
- Canvas
import javax.swing.*;
import java.awt.*;
import java.util.List;
import java.util.*;
public class Canvas
{
// Note: The implementation of this class (specifically the handling of
// shape identity and colors) is slightly more complex than necessary. This
// is done on purpose to keep the interface and instance fields of the
// shape objects in this project clean and simple for educational purposes.
private static Canvas canvasSingleton;
/**
* Factory method to get the canvas singleton object.
*/
public static Canvas getCanvas()
{
if(canvasSingleton == null) {
canvasSingleton = new Canvas("BlueJ Picture Demo", 500, 500,
Color.white);
}
canvasSingleton.setVisible(true);
return canvasSingleton;
}
// ----- instance part -----
private JFrame frame;
private CanvasPane canvas;
private Graphics2D graphic;
private Color backgroundColor;
private Image canvasImage;
private List<Object> objects;
private HashMap<Object, ShapeDescription> shapes;
/**
* Create a Canvas.
* @param title title to appear in Canvas Frame
* @param width the desired width for the canvas
* @param height the desired height for the canvas
* @param bgColor the desired background color of the canvas
*/
private Canvas(String title, int width, int height, Color bgColor)
{
frame = new JFrame();
canvas = new CanvasPane();
frame.setContentPane(canvas);
frame.setTitle(title);
frame.setLocation(30, 30);
canvas.setPreferredSize(new Dimension(width, height));
backgroundColor = bgColor;
frame.pack();
objects = new ArrayList<Object>();
shapes = new HashMap<Object, ShapeDescription>();
}
/**
* Set the canvas visibility and brings canvas to the front of screen
* when made visible. This method can also be used to bring an already
* visible canvas to the front of other windows.
* @param visible boolean value representing the desired visibility of
* the canvas (true or false)
*/
public void setVisible(boolean visible)
{
if(graphic == null) {
// first time: instantiate the offscreen image and fill it with
// the background color
Dimension size = canvas.getSize();
canvasImage = canvas.createImage(size.width, size.height);
graphic = (Graphics2D)canvasImage.getGraphics();
graphic.setColor(backgroundColor);
graphic.fillRect(0, 0, size.width, size.height);
graphic.setColor(Color.black);
}
frame.setVisible(visible);
}
/**
* Draw a given shape onto the canvas.
* @param referenceObject an object to define identity for this shape
* @param color the color of the shape
* @param shape the shape object to be drawn on the canvas
*/
// Note: this is a slightly backwards way of maintaining the shape
// objects. It is carefully designed to keep the visible shape interfaces
// in this project clean and simple for educational purposes.
public void draw(Object referenceObject, String color, Shape shape)
{
objects.remove(referenceObject); // just in case it was already there
objects.add(referenceObject); // add at the end
shapes.put(referenceObject, new ShapeDescription(shape, color));
redraw();
}
/**
* Erase a given shape's from the screen.
* @param referenceObject the shape object to be erased
*/
public void erase(Object referenceObject)
{
objects.remove(referenceObject); // just in case it was already there
shapes.remove(referenceObject);
redraw();
}
/**
* Set the foreground color of the Canvas.
* @param newColor the new color for the foreground of the Canvas
*/
public void setForegroundColor(String colorString)
{
if(colorString.equals("red")) {
graphic.setColor(new Color(235, 25, 25));
}
else if(colorString.equals("black")) {
graphic.setColor(Color.black);
}
else if(colorString.equals("blue")) {
graphic.setColor(new Color(30, 75, 220));
}
else if(colorString.equals("yellow")) {
graphic.setColor(new Color(255, 230, 0));
}
else if(colorString.equals("green")) {
graphic.setColor(new Color(80, 160, 60));
}
else if(colorString.equals("magenta")) {
graphic.setColor(Color.magenta);
}
else if(colorString.equals("white")) {
graphic.setColor(Color.white);
}
else {
graphic.setColor(Color.black);
}
}
/**
* Wait for a specified number of milliseconds before finishing.
* This provides an easy way to specify a small delay which can be
* used when producing animations.
* @param milliseconds the number
*/
public void wait(int milliseconds)
{
try
{
Thread.sleep(milliseconds);
}
catch (Exception e)
{
// ignoring exception at the moment
}
}
/**
* Redraw ell shapes currently on the Canvas.
*/
private void redraw()
{
erase();
for(Object shape : objects) {
shapes.get(shape).draw(graphic);
}
canvas.repaint();
}
/**
* Erase the whole canvas. (Does not repaint.)
*/
private void erase()
{
Color original = graphic.getColor();
graphic.setColor(backgroundColor);
Dimension size = canvas.getSize();
graphic.fill(new Rectangle(0, 0, size.width, size.height));
graphic.setColor(original);
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class CanvasPane extends JPanel
{
public void paint(Graphics g)
{
g.drawImage(canvasImage, 0, 0, null);
}
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class ShapeDescription
{
private Shape shape;
private String colorString;
public ShapeDescription(Shape shape, String color)
{
this.shape = shape;
colorString = color;
}
public void draw(Graphics2D graphic)
{
setForegroundColor(colorString);
graphic.fill(shape);
}
}
}
- Circle
import java.awt.*;
import java.awt.geom.*;
public class Circle
{
private int diameter;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new circle at default position with default color.
*/
public Circle()
{
diameter = 68;
xPosition = 230;
yPosition = 90;
color = "blue";
}
/**
* Make this circle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this circle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the circle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the circle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newDiameter)
{
erase();
diameter = newDiameter;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/**
* Draw the circle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
diameter, diameter));
canvas.wait(10);
}
}
/**
* Erase the circle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}
- Square
import java.awt.*;
public class Square
{
private int size;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new square at default position with default color.
*/
public Square()
{
size = 60;
xPosition = 310;
yPosition = 120;
color = "red";
isVisible = false;
}
/**
* Make this square visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this square invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the square horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the square vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newSize)
{
erase();
size = newSize;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/**
* Draw the square with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color,
new Rectangle(xPosition, yPosition, size, size));
canvas.wait(10);
}
}
/**
* Erase the square on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}
- Triangle
import java.awt.*;
public class Triangle
{
private int height;
private int width;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new triangle at default position with default color.
*/
public Triangle()
{
height = 60;
width = 70;
xPosition = 210;
yPosition = 140;
color = "green";
isVisible = false;
}
/**
* Make this triangle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this triangle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the triangle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the triangle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newHeight, int newWidth)
{
erase();
height = newHeight;
width = newWidth;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/**
* Draw the triangle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
int[] xpoints = { xPosition, xPosition + (width/2), xPosition - (width/2) };
int[] ypoints = { yPosition, yPosition + height, yPosition + height };
canvas.draw(this, color, new Polygon(xpoints, ypoints, 3));
canvas.wait(10);
}
}
/**
* Erase the triangle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}
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