gfx/Color4

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/* **-*-c++-*-**************************************************************
  Copyright (C)1996 David Jung <opensim@pobox.com>

  This program/file 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.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details. (http://www.gnu.org)
  
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
  $Id: Color4 1030 2004-02-11 20:46:17Z jungd $
  $Revision: 1.4 $
  $Date: 2004-02-11 15:46:17 -0500 (Wed, 11 Feb 2004) $
  $Author: jungd $
 
****************************************************************************/

#ifndef _GFX_COLOR4_
#define _GFX_COLOR4_

#include <gfx/gfx>

#include <gfx/Color3>

namespace gfx {

class Color4
{

public:
  Color4() { r=g=b=a=Real(0); }
  Color4(const Color4& c) { r=c.r; g=c.g; b=c.b; a=c.a; }
  Color4(const String& name, Real ac = Real(1)) { *this = Color3(name); a=ac; }
  Color4(const Color3& c) { r=c.r; g=c.g; b=c.b; a=Real(1); }
  Color4(Real rc, Real gc, Real bc, Real ac = Real(1))
  { r = rc; g = gc; b = bc; a = ac; }
  ~Color4() {}

  Color4& operator=(const Color4& c)
  { r=c.r; g=c.g; b=c.b; a=c.a; return *this; }

  Color4& operator=(const Color3& c)
  { r=c.r; g=c.g; b=c.b; a=Real(1); return *this; }

  bool operator==(const Color4& c) const
  { return ((r==c.r) && (g==c.g) && (b==c.b) && (a==c.a)); }

  bool equals(const Color4& c, Real epsilon = consts::epsilon) const
  { return base::equals(r,c.r,epsilon) && base::equals(g,c.g,epsilon) 
           && base::equals(b,c.b,epsilon) && base::equals(a,c.a,epsilon); }

  void setZero() { r=g=b=a=Real(0); }
        
  Color4& operator*=(Real s) 
  { s=base::abs(s); if (s<1.0) { r*=s; g*=s; b*=s; } return *this; }
  
  static Color4 interpolate(const Color4& c1, const Color4& c2, Real t)
  { return Color4((1.0-t)*c1.r+t*c2.r,(1.0-t)*c1.g+t*c2.g,(1.0-t)*c1.b+t*c2.b,(1.0-t)*c1.a+t*c2.a); }

  Real* c_array() { return &r; }


  Real r,g,b,a;

};

inline std::ostream& operator<<(std::ostream& out, const Color4& c) // Output
{ return out << "(" << c.r << "," << c.g << "," << c.b << "," << c.a << ")"; }

} // gfx

#endif

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