Computer Science 120
Introduction to Programming
Spring 2012, Siena College
FancyBasketball Demo
A working demo of FancyBasketball will appear below. Click inside the applet to interact with it.
FancyBasketball BlueJ Project
Click here to download a BlueJ project for FancyBasketball.
FancyBasketball Source Code
The Java source code for FancyBasketball is below. Click on a file name to download it.
import objectdraw.*;
import java.awt.*;
/*
* A simple basketball program. It adds 2 points to
* a displayed score whenever the ball is dragged into
* the oval (hoop).
*
* This version uses a nicer basketball object from NiceBBall
*
* Jim Teresco, Siena College, CSIS 120, Spring 2011
* Based on example from Williams College, CSCI 134
*
* $Id: FancyBasketball.java 1534 2011-02-14 02:33:34Z terescoj $
*/
public class FancyBasketball extends WindowController {
// Location of the display
private static final double DISPLAY_FROM_TOP = 0.5; // display is half way down
private static final int DISPLAY_SIZE = 16; // in points
// Location and dimensions of the hoop
private static final double HOOP_FROM_TOP = 0.25;
private static final int HOOP_WIDTH = 100;
private static final int HOOP_HEIGHT = 60;
// Initial location and dimensions of the ball
private static final double BALL_FROM_TOP = 0.75;
private static final int BALL_SIZE = 40;
private static final Color BALL_COLOR = new Color(250, 115, 10);
// instance variables
// court elements
private FramedOval hoop;
private NiceBBall ball;
private Text scoreboard;
// keep track of whether we are dragging the ball
private boolean ballGrabbed;
// last mouse position for dragging
private Location lastMouse;
// current score
private int score;
public void begin() {
// draw the court
// create scoreboard, adjust font size, center it
scoreboard = new Text("Drag the ball to the hoop to score points!",
0, DISPLAY_FROM_TOP * canvas.getHeight(), canvas);
scoreboard.setFontSize(DISPLAY_SIZE);
scoreboard.moveTo(canvas.getWidth()/2 - scoreboard.getWidth()/2,
DISPLAY_FROM_TOP * canvas.getHeight() - scoreboard.getHeight()/2);
// draw the hoop
hoop = new FramedOval(canvas.getWidth()/2 - HOOP_WIDTH/2,
canvas.getHeight() * HOOP_FROM_TOP - HOOP_HEIGHT/2,
HOOP_WIDTH, HOOP_HEIGHT, canvas);
// draw the ball
ball = new NiceBBall(canvas.getWidth()/2 - BALL_SIZE/2,
canvas.getHeight() * BALL_FROM_TOP - BALL_SIZE/2,
BALL_SIZE, canvas);
// initialize score to 0
score = 0;
}
public void onMousePress(Location point) {
// check if we pressed the mouse on the ball
if (ball.contains(point)) {
// if so, set up for dragging the ball
ballGrabbed = true;
lastMouse = point;
}
}
public void onMouseDrag(Location point) {
// check if we are dragging the ball
if (ballGrabbed) {
// if so, update position to current
ball.move(point.getX() - lastMouse.getX(),
point.getY() - lastMouse.getY());
lastMouse = point;
}
}
public void onMouseRelease(Location point) {
// check if we are dragging the ball
if (ballGrabbed) {
// if so, date position to current
ball.move(point.getX() - lastMouse.getX(),
point.getY() - lastMouse.getY());
// check if the ball is in the hoop
if (hoop.contains(point)) {
score = score + 2;
scoreboard.setText("Basket! Your score is " + score);
}
else {
scoreboard.setText("You missed! Your score is " + score);
}
scoreboard.moveTo(canvas.getWidth()/2 - scoreboard.getWidth()/2,
DISPLAY_FROM_TOP * canvas.getHeight() - scoreboard.getHeight()/2);
}
ballGrabbed = false;
ball.moveTo(canvas.getWidth()/2 - BALL_SIZE/2,
canvas.getHeight() * BALL_FROM_TOP - BALL_SIZE/2);
}
public void onMouseExit(Location point) {
// when the mouse exits the window, we'll give the ball
// a random color
ball.changeToRandomColor();
}
public void onMouseEnter(Location point) {
// when the mouse enters the window, go back to regular color
ball.backToNormalColor();
}
}
import objectdraw.*;
import java.awt.Color;
/*
* A class that implements a nice looking basketball.
*/
public class NiceBBall {
// the color to draw the ball
private static final Color BALL_ORANGE = new Color(250, 85, 10);
// size and starting angles for cut arc in degrees
private static final int CUTSIZE = 100;
private static final int RIGHTCUTSTART = 90 + (180 - CUTSIZE) / 2;
private static final int LEFTCUTSTART = 270 + (180 - CUTSIZE) / 2;
// the orange part of the ball
private FilledOval body;
// the border of the ball
private FramedOval border;
// the two curves on the sides of the ball
private FramedArc leftCut, rightCut;
// the vertical and horizontal lines through the ball
private Line vert, horiz;
// to pick new random color for ball
private RandomIntGenerator colorPicker = new RandomIntGenerator(0,255);
/*
* Create a new basketball.
*/
public NiceBBall(double left, double top, double size, DrawingCanvas aCanvas) {
// draw the circles that make it look like a ball
body = new FilledOval(left, top, size, size, aCanvas);
body.setColor(BALL_ORANGE);
border = new FramedOval(left, top, size, size, aCanvas);
// draw the lines and arcs that make it look like a basketball
rightCut = new FramedArc(left + size * 2 / 3, top, size, size, RIGHTCUTSTART, CUTSIZE, aCanvas);
leftCut = new FramedArc(left - size * 2 / 3, top, size, size, LEFTCUTSTART, CUTSIZE, aCanvas);
vert = new Line(left + size / 2, top, left + size / 2, top + size, aCanvas);
horiz = new Line(left, top + size / 2, left + size, top + size / 2, aCanvas);
}
/*
* Move the ball by specified offsets.
*/
public void move(double dx, double dy) {
// move each part of the ball by the offsets provided
body.move(dx, dy);
border.move(dx, dy);
vert.move(dx, dy);
horiz.move(dx, dy);
leftCut.move(dx, dy);
rightCut.move(dx, dy);
}
/*
* Check to see if the ball contains a specified location.
*/
public boolean contains(Location point) {
return body.contains(point);
}
/*
* Move the ball to a specified position.
*/
public void moveTo(double x, double y) {
// determine how far away (x,y) is
double dx, dy;
dx = x - body.getX();
dy = y - body.getY();
// move each part of the ball by the offset,
// using our own move method.
this.move(dx, dy);
}
/*
* Return the x coordinate of ball's corner.
*/
public double getX() {
return body.getX();
}
/*
* Return the y coordinate of ball's corner.
*/
public double getY() {
return body.getY();
}
public void changeToRandomColor() {
Color newBallColor = new Color(colorPicker.nextValue(),
colorPicker.nextValue(),
colorPicker.nextValue());
body.setColor(newBallColor);
}
public void backToNormalColor() {
body.setColor(BALL_ORANGE);
}
}