// SetOfRects.java
// Solution to Short Assignment #10 by THC.

// Represents a set of Rect objects. When we want to add a Rect object to the
// set but the set is full, we replace the least recently added Rect by the
// new Rect.

import java.awt.*;

public class SetOfRects {
  private Rect[] rects;           // reference to array of rectangles
  private int rectCount;          // Only entries 0 to rectCount-1 have real rectangles
  private int leastRecentlyAdded; // index of least recently added rectangle

  // Constructor for a setOfRects. Makes an empty set of a given max size.
  public SetOfRects(int size) {
    rectCount = 0;
    rects = new Rect[size];
    leastRecentlyAdded = 0;
  }

  // Add a rectangle to a setOfRects.  If there's no room, punt the least
  // recently added rectangle.
  public void add(int left, int top, int width, int height, Color clr) {
    add(new Rect(left, top, width, height, clr));
  }

  // Add a rectangle to a setOfRects.  If there's no room, punt the least
  // recently added rectangle.
  // Alternate version.
  public void add(Rect rectangle) {
    if (rectCount < rects.length) {
      // There's room.
      rects[rectCount] = rectangle;
      rectCount++;
    }
    else {
      // No room for the new rectangle.
      rects[leastRecentlyAdded] = rectangle;
      leastRecentlyAdded = (leastRecentlyAdded + 1) % rects.length;
    }
  }

  // Draw all rectangles in a setOfRects.
  public void fill(Graphics page) {
    for (int i = 0; i < rectCount; i++)
      rects[i].fill(page);
  }
}