Computer Science 120
Introduction to Programming
Spring 2011, 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); } }