// ====== FILE: Point.java ========= //

package hw3;

/**

* A class to that models a 2D point.

*/

public class Point {

private double x;

private double y;

/**

* Construct the point (x, y).

* @param x the Point's x coordinate

* @param y the Point's y coordinate

*/

public Point(double x, double y) {

this.x = x;

this.y = y;

}

/**

* Move the point to (newX, newY).

* @param newX the new x coordinate for this Point.

* @param newY the new y coordinate for this Point.

*/

public void moveTo(double newX, double newY) {

newX = (Math.random()*400)-x;

newY = (Math.random()*400)-y;

}

/**

* Returns the point's x coordinate

* @return the point's x coordinate

*/

public double getX() {

return x;

}

/**

* Returns the point's y coordinate

* @return the point's y coordinate

*/

public double getY() {

return y;

}

/**

* Returns the distance between this Point and the Point p2

* @param p2 the other Point

* @return the distance between this Point and the Point p2

*/

public double distance(Point p2) {

double x1 = p2.getX();

double y1 = p2.getY();

double x2 = this.x;

double y2 = this.y;

double d = Math.sqrt((Math.pow((x2-x1), x) + Math.pow((y2-y1), y)));

return d;

}

}

// ====== FILE: Ball.java ========= //

package hw3;

import java.awt.Color;

import edu.princeton.cs.algs4.StdDraw;

/** * A class that models a bounding ball */ public class Ball { // Minimum and maximum x and y values for the screen private static double minX; private static double minY; private static double maxX; private static double maxY;

private Point center; private double radius; // Every time the ball moves, its x position changes by vX; private double vX; // Every time the ball moves, its y position changes by vY; private double vY; private Color color;

/** * Sets the minimum and maximum x and y values of the screen on which the balls appear. * The bottom left of the screen is at (minX, minY) while the * top right is at (maxX, maxY). * @param minX the leftmost x value * @param minY the bottommost y value * @param maxX the rightmost x value * @param maxY the topmost y value */ public static void setScreen(double minX, double minY, double maxX, double maxY) { Ball.minX = minX; Ball.minY = minY; Ball.maxX = maxX; Ball.maxY = maxY; } /** * Constructs a ball. * @param centerX the x coordinate of the center of the ball * @param centerY the y coordinate of the center of the ball * @param r the radius of the ball * @param vX the velocity of the ball along the x-axis * @param vY the velocity of the ball along the y-axis * @param col the color of the ball */ public Ball(double centerX, double centerY, double r, double vX, double vY, Color col) { center = new Point(centerX, centerY); radius = r; this.vX = vX; this.vY = vY; color = col; } /** * Moves the ball (changes its position) by vX along the x-axis * and by vY along the y-axis. Additionally, if the ball has * reached one of the edges of the screen it changes the velocity * to reflect that the ball has bounced off the edge. */ public void move() { //TODO - This code is wrong and needs to be fixed

} /** * Determines if this has collided with b2. * @param b2 the other Ball * @return ture if this has collided with * b2. */ public boolean collision(Ball b2) { //TODO - This code is wrong and needs to be fixed return false; } /** * Draws the Ball on the screen. */ public void draw() { StdDraw.setPenColor(color); StdDraw.filledCircle(center.getX(), center.getY(), radius); } }