Source: raytracer/pattern.h

/* *************************************************************************
                          pattern.h  -  description
                             -------------------
    begin                : Fri Oct 18 2002
    copyright            : (C) 2002 by Micha Riser
    email                : mriser@gmx.net
 ************************************************************************* */

/* *************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ************************************************************************* */

#ifndef PATTERN_H
#define PATTERN_H

#include "function.h"
#include "types.h"
#include "vector.h"

/**A pattern is a function which orders a value (in the range [0,1]) to each point in space.
  *@author Micha Riser
  */

class Pattern: public Function<Vector3,FLT> {
public: // Constructor and destructor
    Pattern() {}
    virtual ~Pattern() {}

public: // Pure virtual functions
    virtual Pattern* copy() const = 0;
    
protected: // Constants
    static const DBL SPACE_EPSILON;
    
};


/**Checkered Pattern.
  *Returns 0 for Points in "even" cubes, 1 in "uneven".
  *@author Micha Riser
  */
class Checker: public Pattern {

public: // Public methods

    //Inherited form Pattern
    FLT evaluateAt(const Vector3& v) const;
    Pattern* copy() const;

};


/**Gradient Pattern. Repeating pattern along given axe.
  *@author Micha Riser
  */
class Gradient: public Pattern {
public: // Constructor and destructor
    Gradient(const Vector3& g): gradient(g) {}
public: // Public methods
    //Inherited form Pattern
    FLT evaluateAt(const Vector3& v) const;
    Pattern* copy() const;
private: // Private attributes
    Vector3 gradient;
};

#endif