Computer Science 120
Introduction to Programming

Spring 2012, Siena College

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Basketball Demo

A working demo of Basketball will appear below. Click inside the applet to interact with it.

Basketball BlueJ Project

Click here to download a BlueJ project for Basketball.

Basketball Source Code

The Java source code for Basketball is below. Click on a file name to download it.

Basketball.java

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).
 *
 * Jim Teresco, Siena College, CSIS 120, Spring 2011
 * Based on example from Williams College, CSCI 134
 *
 * $Id: Basketball.java 1515 2011-01-31 04:19:16Z terescoj $
 */

public class Basketball extends WindowController {

    // Location of the display
    private static final int DISPLAY_X = 80;
    private static final int DISPLAY_Y = 200;
    private static final int DISPLAY_SIZE = 16; // in points

    // Location and dimensions of the hoop
    private static final int HOOP_TOP = 50;
    private static final int HOOP_LEFT = 160;
    private static final int HOOP_WIDTH = 100;
    private static final int HOOP_HEIGHT = 60;

    // Initial location and dimensions of the ball
    private static final int BALL_X = 190;
    private static final int BALL_Y = 300;
    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 FilledOval 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
        scoreboard = new Text("Drag the ball to the hoop to score points!",
            DISPLAY_X, DISPLAY_Y, canvas);
        // draw the hoop
        hoop = new FramedOval(HOOP_LEFT, HOOP_TOP, HOOP_WIDTH, HOOP_HEIGHT, canvas);
        // draw the ball
        ball = new FilledOval(BALL_X, BALL_Y, BALL_SIZE, BALL_SIZE, canvas);
        ball.setColor(BALL_COLOR);
        // 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);
            }
        }
        ballGrabbed = false;
        ball.moveTo(BALL_X, BALL_Y);
    }
}