KeosRectangle.cpp

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/*
 * This source file is part of KEOS (Free 3D Engine)
 * For the latest info, see http://www.keosengine.org/
 * E-mails : thierry.vouriot@keosengine.org, yeri@keosengine.org
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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, or go to
 * http://www.gnu.org/copyleft/lesser.txt.
 *
 */
#include "KeosRectangle.h"

namespace Keos
{

  //=======================================================================
  // CRectangle implementation
  //=======================================================================

  //-----------------------------------------------------------------------
  CRectangle::CRectangle(const TVector2I& Start, const TVector2I& Size) :
      Origin(Start),
      End   (Start + Size)
  {}

  //-----------------------------------------------------------------------
  CRectangle::CRectangle(int nLeft, int nTop, int nWidth, int nHeight) :
      Origin(nLeft, nTop),
      End   (nLeft + nWidth, nTop + nHeight)
  {}

  //-----------------------------------------------------------------------
  void CRectangle::Set(int nLeft, int nTop, int nWidth, int nHeight)
  {
    Origin.Set(nLeft, nTop);
    End.Set(nLeft + nWidth, nTop + nHeight);
  }

  //-----------------------------------------------------------------------
  int CRectangle::Left() const
  {
    return Origin.x;
  }

  //-----------------------------------------------------------------------
  int CRectangle::Right() const
  {
    return End.x;
  }

  //-----------------------------------------------------------------------
  int CRectangle::Top() const
  {
    return Origin.y;
  }

  //-----------------------------------------------------------------------
  int CRectangle::Bottom() const
  {
    return End.y;
  }

  //-----------------------------------------------------------------------
  int CRectangle::Width() const
  {
    return End.x - Origin.x;
  }

  //-----------------------------------------------------------------------
  int CRectangle::Height() const
  {
    return End.y - Origin.y;
  }

  //-----------------------------------------------------------------------
  TVector2I CRectangle::Size() const
  {
    return End - Origin;
  }

  //-----------------------------------------------------------------------
  TIntersection CRectangle::Intersects(const TVector2I& Point) const
  {
    if ((Point.x >= Origin.x) && (Point.y >= Origin.y) && (Point.x <= End.x) && (Point.y <= End.y))
      return INT_IN;
    else
      return INT_OUT;
  }

  //-----------------------------------------------------------------------
  TIntersection CRectangle::Intersects(const CRectangle& Rect) const
  {
    // Intersection rectangle
    TVector2I Start(std::max(Origin.x, Rect.Origin.x), std::max(Origin.y, Rect.Origin.y));
    TVector2I End(std::min(End.x, Rect.End.x), std::min(End.y, Rect.End.y));
    CRectangle Overlap(Start, End - Start);

    if ((Start.x > End.x) || (Start.y > End.y))
      return INT_OUT;
    else if ((Overlap == *this) || (Overlap == Rect))
      return INT_IN;
    else
      return INT_INTERSECTS;
  }

  //-----------------------------------------------------------------------
  bool CRectangle::operator ==(const CRectangle& Rect) const
  {
    return (Origin == Rect.Origin) && (End == Rect.End);
  }

  //-----------------------------------------------------------------------
  bool CRectangle::operator !=(const CRectangle& Rect) const
  {
    return !(*this == Rect);
  }

  //-----------------------------------------------------------------------
  std::istream& operator >>(std::istream& Stream, CRectangle& Rect)
  {
    return Stream >> Rect.Origin >> Rect.End;
  }

  //-----------------------------------------------------------------------
  std::ostream& operator <<(std::ostream& Stream, const CRectangle& Rect)
  {
    return Stream << Rect.Origin << " " << Rect.End;
  }

} // namespace Keos

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