Rectangle

/* Rectangle
 * <Description>
 * Creates a Rectangle object
 * <Usage>
 * javac Rectangle.java StadDraw.java
 *
 * API:
 * class Rectangle
 * public Rectangle(double x0, double y0, double w, double h)
 * public double area()
 * public double perimeter()
 * public boolean intersects(Rectangle b)
 * public void show(Rectangle b)
 *
 * <References>
 * http://introcs.cs.princeton.edu/java/stdlib/
 * UAB CIS201L-2014 Summer Dr. Sloan
 * @author
 * Dan Latham
 * <[email protected]>
 * @version 0.0.1
 *
 */

public class Rectangle
{
    private final double x;
    private final double y;
    private final double width;
    private final double height;

    public Rectangle(double x0, double y0, double w, double h)
    {
        x = x0;
        y = y0;
        width = w;
        height = h;
    }
    public double area()
    {
        return (double) width * height;
    }
    public double perimeter()
    {
        return (double) 2*width + 2*height;
    }
    public boolean intersects(Rectangle b)
    {
        //check if x and y points are the same
        if (x == b.x && y == b.y)
        {
            if (width == b.width || height == b.height) return true;
            else if (width > b.width && height < b.height) return true;
            else if (width < b.width && height > b.height) return true;
        }
        //check if rightside of rect.a.x goes past rect.b.x or at rect.b.x
        else if (x <= b.x) if (x+(width/2) >= b.x-(width/2)) return true;
        //opposite
        else if (x > b.x) if (b.x+(width/2) >= x-(width/2)) return true;
        //check if top of a.y goes past b.y
        else if (y <= b.y) if (y+(height/2) >= b.y-(height/2)) return true;
        //opposite
        else if (y > b.y) if (b.y+(height/2) >= y-(height/2)) return true;
        return false; //base
    }
    public void show(Rectangle b)
    {
        StdDraw.setPenRadius();
        StdDraw.setPenColor(StdDraw.BOOK_BLUE);
        StdDraw.rectangle(b.x,b.y,b.width/2,b.height/2);
        StdDraw.show(1);
    }
}