Range2D.java

/***********************************************************
  * Donna Gabai, dgabai, P01B
  * fall10 exam 2
  * 
  * Range2D object for 2-dimensional intervals.
  * All intervals are open and are in the range (0, 1).
  * 
  * Dependencies: StdIn, StdOut, StdDraw, Range1D
  * *******************************************************/

public class Range2D {
  // instance variables
  private Range1D h;    // horizontal range
  private Range1D v;    // vertical range
  
  // constructor
  public Range2D(Range1D hor, Range1D vert) {
    // not a defensive copy
    h = hor;
    v = vert;
  }
  
  // Does this range intersect that?
  public boolean intersects(Range2D that) {
    // Intersects if BOTH h and v ranges intersect
    if (this.h.intersects(that.h) && this.v.intersects(that.v))
      return true;
    else return false;
  }
  
  // Draw a rectangle that shows this range
  public void draw() {
    // find center (x, y) and halfwidth and halfheight
    double cx = h.mid();
    double cy = v.mid();
    double halfw = h.size()/2.0;
    double halfh = v.size()/2.0;
    StdDraw.filledRectangle(cx, cy, halfw, halfh);
  }
  
  // string representation of a range
  public String toString() {
    String s = "(" + h.toString() + ", " + v.toString() + ")";
    return s;
  }
  
  // test main
  public static void main(String[] args) {
    // read in range pairs from standard input
    // assumes good data in appropriate order and quantity
    while(!StdIn.isEmpty()) {
      // first range
      double lo1 = StdIn.readDouble();
      double hi1 = StdIn.readDouble();
      Range1D r1 = new Range1D(lo1, hi1);
      
      // second range
      double lo2 = StdIn.readDouble();
      double hi2 = StdIn.readDouble();
      Range1D r2 = new Range1D(lo2, hi2);
      
      // make 2D range
      Range2D r2d = new Range2D(r1, r2);
      // output: Draw it
      r2d.draw();
    }
  }
  
}