might help you, Marc

gistfile1.txt

package shapes;

import java.awt.Graphics;
import java.awt.Color;

/**
 * @author - Jeong Min Kim u0264416
 * @version - 3/14/2017
 * @pre_condition you need 6 int values
 * @post_condition you get back an object that is initially 200 pixels in width and 100 in height. It will move on a timer
 */
public class Rectangle
{

    int RECT_WIDTH = 200;
    int RECT_HEIGHT = 100;
    int x = Shapes.WIN_WIDTH/2-100;
    int y = Shapes.WIN_HEIGHT/2-50;

    int xVelocity=4;
    int yVelocity=4;

    Color rectangleColor = Color.CYAN;

    public void paint(Graphics g)
    {
        g.setColor(rectangleColor);
        g.fillRect(x, y, RECT_WIDTH, RECT_HEIGHT);
    }

    public void update()
    {
        // we are giving directions to our rectangle object
        // we want our object to move down and to the left by incremements of 4 pixels.
        x = x + xVelocity;
        y = y + yVelocity;

        // if x is less than 0 or x is greather than the height of our JPanel, then
        // the velocity xVelocity will be subtracted by 4
        if(x<0 || x > Shapes.WIN_HEIGHT)
        {
            xVelocity=-xVelocity;
        }

        if(y<0 || y> Shapes.WIN_HEIGHT)
        {
            yVelocity=-yVelocity;
        }
    }

    // this method will when called choose the color of the object at random.
    public void changeColorOnMouseEvent()
    {
        Color colorsArray[] = new Color[]{Color.CYAN, Color.MAGENTA, Color.BLACK, Color.YELLOW, Color.DARK_GRAY, Color.RED, Color.BLUE, Color.GREEN, Color.ORANGE, Color.PINK};

        int value =(int)(Math.random()*colorsArray.length);

        rectangleColor = colorsArray[value];

    }

}