/*
 *  File:  Parallelogram.java
 *
 *  Parallelogram class
 *
 *  Copyright:  Northeast Parallel Architectures Center
 *  
 */

// A parallelogram is a quadrilateral with parallel sides:
public class Parallelogram extends Quadrilateral {

   // horizontal displacement (from vertical):
   private int d;
   // height of parallelogram:
   private int h;
   
   // accessor methods:
   public int getHeight() { return h; }
   public int getDisplacement() { return d; }
   
   // Parallelogram constructor #1 (assume the included
   // angle alpha satisfies the inequality  0 < alpha < PI ):
   public Parallelogram( int x, int y, 
                         int a, int b, 
                         double alpha  ) {
 
      // invoke the no-argument constructor of the superclass:
      super();
 
      // the 'this' reference is optional:
      this.addPoint( x, y );
      this.addPoint( x + a, y );
      this.d = ( int ) Math.round( b * Math.cos( Math.PI - alpha ) );
      this.h = ( int ) Math.round( b * Math.sin( Math.PI - alpha ) );
      this.addPoint( x + a - d, y + h );
      this.addPoint( x - d, y + h );
 
   }

   // Parallelogram constructor #2:
   public Parallelogram( int x, int y, 
                         int a, int b, 
                         double alpha,
                         double theta  ) {
 
      // invoke Parallelogram constructor #1:
      this( x, y, a, b, alpha );
    
      // rotate the parallelogram theta radians:
      this.rotate( theta );
 
   }

}