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Semester 1/Programming 1/Java/Chapter01/Figures/Canvas$1.class Normal file
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Semester 1/Programming 1/Java/Chapter01/Figures/Canvas.ctxt Normal file
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#BlueJ class context
comment0.target=Canvas\ getCanvas()
comment0.text=\nFactory\ method\ to\ get\ the\ canvas\ singleton\ object.\n\n
comment1.params=title\ width\ height\ bgColour
comment1.target=Canvas(String,\ int,\ int,\ Color)
comment1.text=\nCreate\ a\ Canvas.\n@param\ title\ \ title\ to\ appear\ in\ Canvas\ Frame\n@param\ width\ \ the\ desired\ width\ for\ the\ canvas\n@param\ height\ \ the\ desired\ height\ for\ the\ canvas\n@param\ bgClour\ \ the\ desired\ background\ colour\ of\ the\ canvas\n\n
comment2.params=visible
comment2.target=void\ setVisible(boolean)
comment2.text=\nSet\ the\ canvas\ visibility\ and\ brings\ canvas\ to\ the\ front\ of\ screen\nwhen\ made\ visible.\ This\ method\ can\ also\ be\ used\ to\ bring\ an\ already\nvisible\ canvas\ to\ the\ front\ of\ other\ windows.\n@param\ visible\ \ boolean\ value\ representing\ the\ desired\ visibility\ of\nthe\ canvas\ (true\ or\ false)\ \n\n
comment3.params=referenceObject\ color\ shape
comment3.target=void\ draw(Object,\ String,\ Shape)
comment3.text=\nDraw\ a\ given\ shape\ onto\ the\ canvas.\n@param\ \ referenceObject\ \ an\ object\ to\ define\ identity\ for\ this\ shape\n@param\ \ color\ \ \ \ \ \ \ \ \ \ \ \ the\ color\ of\ the\ shape\n@param\ \ shape\ \ \ \ \ \ \ \ \ \ \ \ the\ shape\ object\ to\ be\ drawn\ on\ the\ canvas\n\n
comment4.params=referenceObject
comment4.target=void\ erase(Object)
comment4.text=\nErase\ a\ given\ shape's\ from\ the\ screen.\n@param\ \ referenceObject\ \ the\ shape\ object\ to\ be\ erased\ \n\n
comment5.params=colorString
comment5.target=void\ setForegroundColor(String)
comment5.text=\nSet\ the\ foreground\ colour\ of\ the\ Canvas.\n@param\ \ newColour\ \ \ the\ new\ colour\ for\ the\ foreground\ of\ the\ Canvas\ \n\n
comment6.params=milliseconds
comment6.target=void\ wait(int)
comment6.text=\nWait\ for\ a\ specified\ number\ of\ milliseconds\ before\ finishing.\nThis\ provides\ an\ easy\ way\ to\ specify\ a\ small\ delay\ which\ can\ be\nused\ when\ producing\ animations.\n@param\ \ milliseconds\ \ the\ number\ \n\n
comment7.target=void\ redraw()
comment7.text=\nRedraw\ ell\ shapes\ currently\ on\ the\ Canvas.\n\n
comment8.target=void\ erase()
comment8.text=\nErase\ the\ whole\ canvas.\ (Does\ not\ repaint.)\n\n
numComments=9

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Semester 1/Programming 1/Java/Chapter01/Figures/Canvas.java Normal file
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import javax.swing.*;
import java.awt.*;
import java.util.List;
import java.util.*;
/**
* Canvas is a class to allow for simple graphical drawing on a canvas.
* This is a modification of the general purpose Canvas, specially made for
* the BlueJ "shapes" example.
*
* @author: Bruce Quig
* @author: Michael Kolling (mik)
*
* @version: 1.6 (shapes)
*/
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 Shapes Demo", 300, 300,
Color.white);
}
canvasSingleton.setVisible(true);
return canvasSingleton;
}
// ----- instance part -----
private JFrame frame;
private CanvasPane canvas;
private Graphics2D graphic;
private Color backgroundColour;
private Image canvasImage;
private List objects;
private HashMap 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 bgClour the desired background colour of the canvas
*/
private Canvas(String title, int width, int height, Color bgColour)
{
frame = new JFrame();
canvas = new CanvasPane();
frame.setContentPane(canvas);
frame.setTitle(title);
canvas.setPreferredSize(new Dimension(width, height));
backgroundColour = bgColour;
frame.pack();
objects = new ArrayList();
shapes = new HashMap();
}
/**
* 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 colour
Dimension size = canvas.getSize();
canvasImage = canvas.createImage(size.width, size.height);
graphic = (Graphics2D)canvasImage.getGraphics();
graphic.setColor(backgroundColour);
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 colour of the Canvas.
* @param newColour the new colour for the foreground of the Canvas
*/
public void setForegroundColor(String colorString)
{
if(colorString.equals("red"))
graphic.setColor(Color.red);
else if(colorString.equals("black"))
graphic.setColor(Color.black);
else if(colorString.equals("blue"))
graphic.setColor(Color.blue);
else if(colorString.equals("yellow"))
graphic.setColor(Color.yellow);
else if(colorString.equals("green"))
graphic.setColor(Color.green);
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(Iterator i=objects.iterator(); i.hasNext(); ) {
((ShapeDescription)shapes.get(i.next())).draw(graphic);
}
canvas.repaint();
}
/**
* Erase the whole canvas. (Does not repaint.)
*/
private void erase()
{
Color original = graphic.getColor();
graphic.setColor(backgroundColour);
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);
}
}
}

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Semester 1/Programming 1/Java/Chapter01/Figures/Circle.ctxt Normal file
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#BlueJ class context
comment0.params=
comment0.target=Circle()
comment0.text=\n\ Create\ a\ new\ circle\ at\ default\ position\ with\ default\ color.\n
comment1.params=x\ y
comment1.target=Circle(int,\ int)
comment10.params=distance
comment10.target=void\ moveHorizontal(int)
comment10.text=\n\ Move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
comment11.params=distance
comment11.target=void\ moveVertical(int)
comment11.text=\n\ Move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment12.params=distance
comment12.target=void\ slowMoveHorizontal(int)
comment12.text=\n\ Slowly\ move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
comment13.params=distance
comment13.target=void\ slowMoveVertical(int)
comment13.text=\n\ Slowly\ move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment14.params=newDiameter
comment14.target=void\ changeSize(int)
comment14.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment15.params=newColor
comment15.target=void\ changeColor(java.lang.String)
comment15.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment16.params=
comment16.target=void\ draw()
comment16.text=\n\ Draw\ the\ circle\ with\ current\ specifications\ on\ screen.\n
comment17.params=
comment17.target=void\ erase()
comment17.text=\n\ Erase\ the\ circle\ on\ screen.\n
comment2.params=x\ y\ col
comment2.target=Circle(int,\ int,\ java.lang.String)
comment3.params=x\ y\ col\ d
comment3.target=Circle(int,\ int,\ java.lang.String,\ int)
comment4.params=
comment4.target=void\ makeVisible()
comment4.text=\n\ Make\ this\ circle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment5.params=
comment5.target=void\ makeInvisible()
comment5.text=\n\ Make\ this\ circle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment6.params=
comment6.target=void\ moveRight()
comment6.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ right.\n
comment7.params=
comment7.target=void\ moveLeft()
comment7.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ left.\n
comment8.params=
comment8.target=void\ moveUp()
comment8.text=\n\ Move\ the\ circle\ a\ few\ pixels\ up.\n
comment9.params=
comment9.target=void\ moveDown()
comment9.text=\n\ Move\ the\ circle\ a\ few\ pixels\ down.\n
numComments=18

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Semester 1/Programming 1/Java/Chapter01/Figures/Circle.java Normal file
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import java.awt.*;
import java.awt.geom.*;
/**
* A circle that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
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 = 30;
xPosition = 20;
yPosition = 60;
color = "blue";
isVisible = false;
}
public Circle(int x, int y){
diameter = 30;
xPosition = x;
yPosition = y;
color = "blue";
}
public Circle(int x, int y, String col){
this(x,y,col,20);
}
public Circle(int x, int y, String col, int d){
diameter = d;
xPosition = x;
yPosition = y;
color = "blue";
makeVisible();
}
/**
* 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 a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the circle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the circle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the circle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* 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();
}
/**
* Slowly move the circle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the circle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
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);
}
}
}

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Semester 1/Programming 1/Java/Chapter01/Figures/README.TXT Normal file
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Project "shapes"
Authors: Michael Kolling and David J. Barnes
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
David J. Barnes and Michael Kolling
Pearson Education, 2002
It is discussed in chapter 1.
This is a very simple project to demonstrate some characteristics of
objects.
You can create various shapes, and you will see, if you do, that those
shapes are drawn on screen (in a window that we call the "canvas").
You can then manipulate these objects: change their position, size and
colour. Try it out: create a few different squares, triangles and circles.
This project is designed as a first example of object-oriented programming.
It illustrates a number of concepts:
- a Java project (application) is a collection of classes
- objects can be created from classes
- from any one class, many objects may be created
- objects have operations (methods)
- operations can have parameters
- parameters have types (at least String and int)
- objects hold data (fields)
- the operations and fields are common to all objects
- the values stored in the fields can be different for each object
The project also demonstrates
- BlueJ object creation
- interactive method invocation
- parameter passing
A good second project to look at after this is "picture", which adds a class
to those ones in this project. That class (named "Picture") uses the shapes
to draw a picture. It can be used to experiment with coding.
Michael Kolling, July 2000

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#BlueJ class context
comment0.params=
comment0.target=Square()
comment0.text=\n\ Create\ a\ new\ square\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ square\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newSize
comment11.target=void\ changeSize(int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ square\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ square\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ square\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ square\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ square\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

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Semester 1/Programming 1/Java/Chapter01/Figures/Square.java Normal file
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import java.awt.*;
/**
* A square that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
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 = 30;
xPosition = 60;
yPosition = 50;
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 a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the square a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the square a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the square a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* 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();
}
/**
* Slowly move the square horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the square vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
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);
}
}
}

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#BlueJ class context
comment0.target=Triangle()
comment0.text=\nCreate\ a\ new\ triangle\ at\ default\ position\ with\ default\ color.\n\n
comment1.target=void\ makeVisible()
comment1.text=\nMake\ this\ triangle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\nSlowly\ move\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n\n
comment11.params=newHeight\ newWidth
comment11.target=void\ changeSize(int,\ int)
comment11.text=\nChange\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n\n
comment12.params=newColor
comment12.target=void\ changeColor(String)
comment12.text=\nChange\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n"magenta"\ and\ "black".\n\n
comment13.target=void\ draw()
comment13.text=Draw\ the\ triangle\ with\ current\ specifications\ on\ screen.\n\n
comment14.target=void\ erase()
comment14.text=Erase\ the\ triangle\ on\ screen.\n\n
comment2.target=void\ makeInvisible()
comment2.text=\nMake\ this\ triangle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n\n
comment3.target=void\ moveRight()
comment3.text=\nMove\ the\ triangle\ a\ few\ pixels\ to\ the\ right.\n\n
comment4.target=void\ moveLeft()
comment4.text=\nMove\ the\ triangle\ a\ few\ pixels\ to\ the\ left.\n\n
comment5.target=void\ moveUp()
comment5.text=\nMove\ the\ triangle\ a\ few\ pixels\ up.\n\n
comment6.target=void\ moveDown()
comment6.text=\nMove\ the\ triangle\ a\ few\ pixels\ down.\n\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\nMove\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\nMove\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\nSlowly\ move\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n\n
numComments=15

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import java.awt.*;
/**
* A triangle that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
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 = 30;
width = 40;
xPosition = 50;
yPosition = 15;
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 a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the triangle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the triangle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the triangle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* 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();
}
/**
* Slowly move the triangle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the triangle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
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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#BlueJ package file
dependency1.from=Triangle
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Square
dependency2.to=Canvas
dependency2.type=UsesDependency
dependency3.from=Circle
dependency3.to=Canvas
dependency3.type=UsesDependency
objectbench.height=76
objectbench.width=940
package.editor.height=874
package.editor.width=814
package.editor.x=0
package.editor.y=31
package.numDependencies=3
package.numTargets=4
package.showExtends=true
package.showUses=true
project.charset=UTF-8
target1.editor.height=867
target1.editor.width=1100
target1.editor.x=0
target1.editor.y=31
target1.height=40
target1.name=Circle
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=70
target1.x=100
target1.y=120
target2.editor.height=521
target2.editor.width=626
target2.editor.x=0
target2.editor.y=0
target2.height=40
target2.name=Canvas
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=70
target2.x=20
target2.y=180
target3.height=40
target3.name=Triangle
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=70
target3.x=260
target3.y=60
target4.height=40
target4.name=Square
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=70
target4.x=180
target4.y=90

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#BlueJ package file
dependency1.from=Triangle
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Square
dependency2.to=Canvas
dependency2.type=UsesDependency
dependency3.from=Circle
dependency3.to=Canvas
dependency3.type=UsesDependency
objectbench.height=76
objectbench.width=940
package.editor.height=874
package.editor.width=814
package.editor.x=0
package.editor.y=31
package.numDependencies=3
package.numTargets=4
package.showExtends=true
package.showUses=true
project.charset=UTF-8
target1.editor.height=867
target1.editor.width=1100
target1.editor.x=0
target1.editor.y=31
target1.height=40
target1.name=Circle
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=70
target1.x=100
target1.y=120
target2.editor.height=521
target2.editor.width=626
target2.editor.x=0
target2.editor.y=0
target2.height=40
target2.name=Canvas
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=70
target2.x=20
target2.y=180
target3.height=40
target3.name=Triangle
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=70
target3.x=260
target3.y=60
target4.height=40
target4.name=Square
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=70
target4.x=180
target4.y=90

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#BlueJ class context
comment0.params=
comment0.target=Canvas\ getCanvas()
comment0.text=\n\ Factory\ method\ to\ get\ the\ canvas\ singleton\ object.\n
comment1.params=title\ width\ height\ bgColor
comment1.target=Canvas(java.lang.String,\ int,\ int,\ java.awt.Color)
comment1.text=\n\ Create\ a\ Canvas.\n\ @param\ title\ \ \ \ title\ to\ appear\ in\ Canvas\ Frame\n\ @param\ width\ \ \ \ the\ desired\ width\ for\ the\ canvas\n\ @param\ height\ \ \ the\ desired\ height\ for\ the\ canvas\n\ @param\ bgColor\ the\ desired\ background\ color\ of\ the\ canvas\n
comment2.params=visible
comment2.target=void\ setVisible(boolean)
comment2.text=\n\ Set\ the\ canvas\ visibility\ and\ brings\ canvas\ to\ the\ front\ of\ screen\n\ when\ made\ visible.\ This\ method\ can\ also\ be\ used\ to\ bring\ an\ already\n\ visible\ canvas\ to\ the\ front\ of\ other\ windows.\n\ @param\ visible\ \ boolean\ value\ representing\ the\ desired\ visibility\ of\n\ the\ canvas\ (true\ or\ false)\ \n
comment3.params=referenceObject\ color\ shape
comment3.target=void\ draw(java.lang.Object,\ java.lang.String,\ java.awt.Shape)
comment3.text=\n\ Draw\ a\ given\ shape\ onto\ the\ canvas.\n\ @param\ \ referenceObject\ \ an\ object\ to\ define\ identity\ for\ this\ shape\n\ @param\ \ color\ \ \ \ \ \ \ \ \ \ \ \ the\ color\ of\ the\ shape\n\ @param\ \ shape\ \ \ \ \ \ \ \ \ \ \ \ the\ shape\ object\ to\ be\ drawn\ on\ the\ canvas\n
comment4.params=referenceObject
comment4.target=void\ erase(java.lang.Object)
comment4.text=\n\ Erase\ a\ given\ shape's\ from\ the\ screen.\n\ @param\ \ referenceObject\ \ the\ shape\ object\ to\ be\ erased\ \n
comment5.params=colorString
comment5.target=void\ setForegroundColor(java.lang.String)
comment5.text=\n\ Set\ the\ foreground\ color\ of\ the\ Canvas.\n\ @param\ \ newColor\ \ \ the\ new\ color\ for\ the\ foreground\ of\ the\ Canvas\ \n
comment6.params=milliseconds
comment6.target=void\ wait(int)
comment6.text=\n\ Wait\ for\ a\ specified\ number\ of\ milliseconds\ before\ finishing.\n\ This\ provides\ an\ easy\ way\ to\ specify\ a\ small\ delay\ which\ can\ be\n\ used\ when\ producing\ animations.\n\ @param\ \ milliseconds\ \ the\ number\ \n
comment7.params=
comment7.target=void\ redraw()
comment7.text=\n\ Redraw\ ell\ shapes\ currently\ on\ the\ Canvas.\n
comment8.params=
comment8.target=void\ erase()
comment8.text=\n\ Erase\ the\ whole\ canvas.\ (Does\ not\ repaint.)\n
numComments=9

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import javax.swing.*;
import java.awt.*;
import java.util.List;
import java.util.*;
/**
* Canvas is a class to allow for simple graphical drawing on a canvas.
* This is a modification of the general purpose Canvas, specially made for
* the BlueJ "shapes" example.
*
* @author: Bruce Quig
* @author: Michael K<>lling (mik)
*
* @version 2016.02.29
*/
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, 300,
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);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Circle()
comment0.text=\n\ Create\ a\ new\ circle\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ circle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newDiameter
comment11.target=void\ changeSize(int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ circle\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ circle\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ circle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ circle\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ circle\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

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Semester 1/Programming 1/Java/Chapter01/House with Two Suns/Circle.java Normal file
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import java.awt.*;
import java.awt.geom.*;
/**
* A circle that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
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 a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the circle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the circle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the circle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* 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();
}
/**
* Slowly move the circle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the circle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
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);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Person()
comment0.text=\n\ Create\ a\ new\ person\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ person\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ person\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newHeight\ newWidth
comment11.target=void\ changeSize(int,\ int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ person\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ person\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ person\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ person\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ person\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ person\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ person\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ person\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ person\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ person\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

206
Semester 1/Programming 1/Java/Chapter01/House with Two Suns/Person.java Normal file
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import java.awt.*;
/**
* A person that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
public class Person
{
private int height;
private int width;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new person at default position with default color.
*/
public Person()
{
height = 60;
width = 30;
xPosition = 280;
yPosition = 190;
color = "black";
isVisible = false;
}
/**
* Make this person visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this person invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the person a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the person a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the person a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the person a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the person horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the person vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the person horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the person vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
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 person with current specifications on screen.
*/
private void draw()
{
int bh = (int)(height * 0.7); // body height
int hh = (height - bh) / 2; // half head height
int hw = width / 2; // half width
int x = xPosition;
int y = yPosition;
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
int[] xpoints = { x-3, x-hw, x-hw, x-(int)(hw*0.2)-1, x-(int)(hw*0.2)-1, x-hw,
x-hw+(int)(hw*0.4)+1, x, x+hw-(int)(hw*0.4)-1, x+hw, x+(int)(hw*0.2)+1,
x+(int)(hw*0.2)+1, x+hw, x+hw, x+3, x+(int)(hw*0.6),
x+(int)(hw*0.6), x+3, x-3, x-(int)(hw*0.6), x-(int)(hw*0.6) };
int[] ypoints = { y, y+(int)(bh*0.2), y+(int)(bh*0.4), y+(int)(bh*0.2),
y+(int)(bh*0.5), y+bh, y+bh, y+(int)(bh*0.65), y+bh, y+bh,
y+(int)(bh*0.5), y+(int)(bh*0.2), y+(int)(bh*0.4), y+(int)(bh*0.2),
y, y-hh+3, y-hh-3, y-hh-hh, y-hh-hh, y-hh-3, y-hh+3 };
canvas.draw(this, color, new Polygon(xpoints, ypoints, 21));
canvas.wait(10);
}
}
/**
* Erase the person on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Picture()
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ Picture\n
comment1.params=
comment1.target=void\ draw()
comment1.text=\n\ Draw\ this\ picture.\n
comment2.params=
comment2.target=void\ setBlackAndWhite()
comment2.text=\n\ Change\ this\ picture\ to\ black/white\ display\n
comment3.params=
comment3.target=void\ setColor()
comment3.text=\n\ Change\ this\ picture\ to\ use\ color\ display\n
comment4.params=
comment4.target=void\ doSunset()
comment4.text=\n\ Start\ Sunset\n
comment5.params=
comment5.target=void\ doSunrise()
comment5.text=\n\ Start\ Sunrise\n
numComments=6

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/**
* This class represents a simple picture. You can draw the picture using
* the draw method. But wait, there's more: being an electronic picture, it
* can be changed. You can set it to black-and-white display and back to
* colors (only after it's been drawn, of course).
*
* This class was written as an early example for teaching Java with BlueJ.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
public class Picture
{
private Square wall;
private Square window;
private Triangle roof;
private Circle sun;
private Circle sun2;
private Person person;
private boolean drawn;
/**
* Constructor for objects of class Picture
*/
public Picture()
{
wall = new Square();
window = new Square();
roof = new Triangle();
sun = new Circle();
//sun2 = new Circle();
person = new Person();
drawn = false;
}
/**
* Draw this picture.
*/
public void draw()
{
if(!drawn) {
wall.moveHorizontal(-140);
wall.moveVertical(20);
wall.changeSize(120);
wall.makeVisible();
window.changeColor("black");
window.moveHorizontal(-120);
window.moveVertical(40);
window.changeSize(40);
window.makeVisible();
roof.changeSize(60, 180);
roof.moveHorizontal(20);
roof.moveVertical(-60);
roof.makeVisible();
sun.changeColor("blue");
sun.moveHorizontal(100);
sun.moveVertical(-40);
sun.changeSize(80);
sun.makeVisible();
//sun2.changeColor("yellow");
//sun2.moveHorizontal(30);
//sun2.moveVertical(-35);
//sun2.changeSize(50);
//sun2.makeVisible();
drawn = true;
}
}
/**
* Change this picture to black/white display
*/
public void setBlackAndWhite()
{
wall.changeColor("black");
window.changeColor("white");
roof.changeColor("black");
sun.changeColor("black");
//sun2.changeColor("black");
}
/**
* Change this picture to use color display
*/
public void setColor()
{
wall.changeColor("red");
window.changeColor("black");
roof.changeColor("green");
sun.changeColor("yellow");
//sun2.changeColor("green");
}
/**
* Start Sunset
*/
public void doSunset()
{
sun.slowMoveVertical(250);
setBlackAndWhite();
}
/**
* Start Sunrise
*/
public void doSunrise()
{
sun.slowMoveVertical(-250);
setColor();
}
}

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Project "house"
Authors: Michael K<>lling and David J. Barnes
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael K<>lling
Pearson Education, 2016
It is discussed in chapter 1.
This is a very simple project to demonstrate some characteristics of
objects.
This project is often used after studying the "shapes" project. It
adds a class to those ones in "shapes". That class (named "Picture")
uses the shapes to draw a picture. It can be used to experiment with
modifying source code.

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#BlueJ class context
comment0.params=
comment0.target=Square()
comment0.text=\n\ Create\ a\ new\ square\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ square\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newSize
comment11.target=void\ changeSize(int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ square\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ square\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ square\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ square\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ square\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

191
Semester 1/Programming 1/Java/Chapter01/House with Two Suns/Square.java Normal file
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import java.awt.*;
/**
* A square that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
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 a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the square a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the square a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the square a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* 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();
}
/**
* Slowly move the square horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the square vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
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);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Triangle()
comment0.text=\n\ Create\ a\ new\ triangle\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ triangle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newHeight\ newWidth
comment11.target=void\ changeSize(int,\ int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ triangle\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ triangle\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ triangle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

195
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import java.awt.*;
/**
* A triangle that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
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 a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the triangle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the triangle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the triangle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* 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();
}
/**
* Slowly move the triangle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the triangle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
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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#BlueJ package file
dependency1.from=Triangle
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Picture
dependency2.to=Square
dependency2.type=UsesDependency
dependency3.from=Picture
dependency3.to=Triangle
dependency3.type=UsesDependency
dependency4.from=Picture
dependency4.to=Circle
dependency4.type=UsesDependency
dependency5.from=Circle
dependency5.to=Canvas
dependency5.type=UsesDependency
dependency6.from=Square
dependency6.to=Canvas
dependency6.type=UsesDependency
dependency7.from=Person
dependency7.to=Canvas
dependency7.type=UsesDependency
dependency8.from=Picture
dependency8.to=Person
dependency8.type=UsesDependency
objectbench.height=76
objectbench.width=940
package.editor.height=874
package.editor.width=814
package.editor.x=0
package.editor.y=31
package.numDependencies=8
package.numTargets=6
package.showExtends=true
package.showUses=true
project.charset=x-MacRoman
readme.editor.height=557
readme.editor.width=826
readme.editor.x=53
readme.editor.y=23
target1.editor.height=717
target1.editor.width=900
target1.editor.x=53
target1.editor.y=60
target1.height=50
target1.name=Circle
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=80
target1.x=150
target1.y=230
target2.editor.height=774
target2.editor.width=857
target2.editor.x=660
target2.editor.y=201
target2.height=50
target2.name=Picture
target2.naviview.expanded=true
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=80
target2.x=70
target2.y=70
target3.editor.height=781
target3.editor.width=898
target3.editor.x=53
target3.editor.y=51
target3.height=50
target3.name=Canvas
target3.naviview.expanded=true
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=80
target3.x=50
target3.y=310
target4.editor.height=727
target4.editor.width=936
target4.editor.x=53
target4.editor.y=60
target4.height=50
target4.name=Triangle
target4.naviview.expanded=true
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=80
target4.x=350
target4.y=150
target5.editor.height=722
target5.editor.width=879
target5.editor.x=53
target5.editor.y=60
target5.height=50
target5.name=Square
target5.naviview.expanded=true
target5.showInterface=false
target5.type=ClassTarget
target5.typeParameters=
target5.width=80
target5.x=250
target5.y=190
target6.editor.height=697
target6.editor.width=988
target6.editor.x=53
target6.editor.y=90
target6.height=50
target6.name=Person
target6.naviview.expanded=true
target6.showInterface=false
target6.type=ClassTarget
target6.typeParameters=
target6.width=80
target6.x=450
target6.y=120