package cse1030;

import java.awt.Color;

import princeton.introcs.StdDraw;

/**
 * A circle shape. A circle has a radius that is always greater than zero.
 * 
 * @author CSE1030Z
 *
 */
public class Circle extends Shape {
  private double radius;

  
  /**
   * Create a circle with position (0, 0), color blue, and radius 1.
   */
  public Circle() {
    super();
    this.radius = 1.;
  }

  /**
   * Create a circle with position (x, y), and the given radius and color.
   * 
   * @param x the x coordinate of the position of the circle
   * @param y the y coordinate of the position of the circe
   * @param radius the radius of the circle
   * @param color the color of the circle
   * @throws IllegalArgumentException if the radius is zero or negative
   */
  public Circle(double x, double y, double radius, Color color) {
    super(x, y, color);
    this.setRadius(radius);
  }
  
  /**
   * Create a circle with the given position, radius, and color.
   * 
   * @param position the position of the circle
   * @param radius the radius of the circle
   * @param color the color of the circle
   * @throws IllegalArgumentException if the radius is zero or negative
   */
  public Circle(Point2D position, double radius, Color color) {
    super(position, color);
    this.setRadius(radius);
  }

  /**
   * Get the radius of the circle.
   * 
   * @return the radius of the circle
   */
  final public double getRadius() {
    return this.radius;
  }

  /**
   * Set the radius of the circle. The radius must be greater than zero.
   * 
   * @param newRadius the new radius of the circle
   * @throws IllegalArgumentException if the radius is zero or negative
   */
  final public void setRadius(double newRadius) {
    if (newRadius <= 0.) {
      throw new IllegalArgumentException("radius is zero or negative");
    }
    this.radius = newRadius;
  }

  /**
   * Returns a string representation of the circle.
   * 
   * <p>
   * The string returned has the form:
   * 
   * <p>
   * <code>position: (x, y), color: (r, g, b), radius: R</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,
   * and <code>R</code> is the radius.
   * 
   * 
   * @return a string representation of the circle
   */
  @Override
  public String toString() {
    return super.toString() + ", radius: " + this.getRadius(); 
  }
  
  /**
   * Draws a filled circle to <code>StdDraw</code> using the
   * position, radius, and color of this circle.
   */
  @Override
  public void draw() {
    StdDraw.setPenColor(this.getColor());
    StdDraw.filledCircle(this.getPosition().getX(), this.getPosition().getY(),
        this.radius);
  }
}