package cse1030;

import java.awt.Color;

import princeton.introcs.StdDraw;

/**
 * An ellipse shape. An ellipse has a width and height, both of which are always greater than zero.
 * 
 * @author CSE1030Z
 *
 */
public class Ellipse extends Shape {

  private double width;
  private double height;

  /**
   * Create an ellipse with position (0, 0), color blue, width 1, and height 0.5
   */
  public Ellipse() {
    super();
    this.width = 1.0;
    this.height = 0.5;
  }

  /**
   * Create an ellipse with position (x, y), and the given width, height, and color.
   * 
   * @param x the x coordinate of the position of the ellipse
   * @param y the x coordinate of the position of the ellipse
   * @param width the radius of the ellipse
   * @param height the radius of the ellipse
   * @param color the color of the ellipse
   * @throws IllegalArgumentException if either the width or height is zero or negative
   */
  public Ellipse(double x, double y, double width, double height, Color color) {
    super(x, y, color);
    this.setWidth(width);
    this.setHeight(height);
  }

  /**
   * Create an ellipse with the given position, width, height, and color.
   * 
   * @param position the position of the ellipse
   * @param width the radius of the ellipse
   * @param height the radius of the ellipse
   * @param color the color of the ellipse
   * @throws IllegalArgumentException if the width or height is zero or negative
   */
  public Ellipse(Point2D position, double width, double height, Color color) {
    super(position, color);
    this.setWidth(width);
    this.setHeight(height);
  }

  /**
   * Get the width of the ellipse.
   * 
   * @return the width of the ellipse
   */
  public double getWidth() {
    return this.width;
  }

  /**
   * Set the width of the ellipse.
   * 
   * @param newWidth
   *          the new width of the ellipse
   * @throws IllegalArgumentException if the new width is zero or negative
   */
  public void setWidth(double newWidth) {
    if (newWidth <= 0.0) {
      throw new IllegalArgumentException("width is zero or negative");
    }
    this.width = newWidth;
  }

  /**
   * Get the height of the ellipse.
   * 
   * @return the height of the ellipse
   */
  public double getHeight() {
    return this.height;
  }

  /**
   * Set the height of the ellipse.
   * 
   * @param newHeight
   *          the new width of the ellipse
   * @throws IllegalArgumentException if the new height is zero or negative
   */
  public void setHeight(double newHeight) {
    if (newHeight <= 0.0) {
      throw new IllegalArgumentException("height is zero or negative");
    }
    this.height = newHeight;
  }
  
  /**
   * Returns a string representation of the ellipse.
   * 
   * <p>
   * The string returned has the form:
   * 
   * <p>
   * <code>position: (x, y), color: (r, g, b), width: W, height: H</code> where <code>x</code>
   * and <code>y</code> are the coordinates of the position,
   * <code>r</code>, <code>g</code>, and <code>b</code> are the 
   * red, green, and blue components of the color in the range 0-255,
   * <code>W</code> is the width, and <code>H</code> is the height.
   * 
   * @return a string representation of the ellipse
   */
  @Override
  public String toString() {
    return super.toString() + ", xradius: " + this.getWidth() + ", yradius: " + this.getHeight(); 
  }

  /**
   * Draws a filled ellipse to <code>StdDraw</code> using the
   * position, width, height, and color of this ellipse.
   */
  @Override
  public void draw() {
    StdDraw.setPenColor(this.getColor());
    StdDraw.filledEllipse(this.getPosition().getX(), this.getPosition().getY(),
        this.width / 2., this.height / 2.);
  }
}