Computer Science 120
Introduction to Programming

Spring 2012, Siena College

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Basketball2 Demo

A working demo of Basketball2 will appear below. Click inside the applet to interact with it.

Basketball2 BlueJ Project

Click here to download a BlueJ project for Basketball2.

Basketball2 Source Code

The Java source code for Basketball2 is below. Click on a file name to download it.

Basketball2.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: Basketball2.java 1516 2011-01-31 21:08:19Z terescoj $
 */

public class Basketball2 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 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, 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 FilledOval(canvas.getWidth()/2 - BALL_SIZE/2, 
                              canvas.getHeight() * BALL_FROM_TOP - BALL_SIZE/2,
                              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);
            }
            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);
    }
}