path: root/hw5/src/rotationZ3d.cpp

/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527     */
/* without consent of either the College of William & Mary or     */
/* Pieter Peers.                                                  */
/******************************************************************/
#include "constants.h"
#include "rotationZ3d.h"


//////////////////
// Constructors //
//////////////////
rotationZ3d::rotationZ3d(void)
  : transformation3d()
{
  // Do Nothing
}


rotationZ3d::rotationZ3d(float angle)
  : transformation3d()
{
  // HW5: implement a rotation of 'angle' degrees around the Z-axis.
  // Modifies: _transformation, _inverseTransformation, _translation
  // Returns: nothing.
  float s = sin(angle * PI / 180.0f);
  float c = cos(angle * PI / 180.0f);

  _transformation(0,0) = c;
  _transformation(0,1) = -s;
  _transformation(1,0) = s;
  _transformation(1,1) = c;

  _inverseTransformation = transpose(_transformation);
}


rotationZ3d::rotationZ3d(const rotationZ3d& r)
  : transformation3d(r)
{
  // Do Nothing
}