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#ifndef GLT_VIEWPORT_H
#define GLT_VIEWPORT_H
/*
GLT OpenGL C++ Toolkit
Copyright (C) 2000-2002 Nigel Stewart
Email: nigels@nigels.com WWW: http://www.nigels.com/glt/
This library 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 2.1 of the License, or (at your option) any later version.
This library 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 library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*! \file
\brief OpenGL Viewport Class
\ingroup GLT
$Id: viewport.h,v 1.13 2002/10/11 08:33:21 nigels Exp $
$Log: viewport.h,v $
Revision 1.13 2002/10/11 08:33:21 nigels
Added GLint *() operator
Added resize to (image-space) bounding box
Revision 1.12 2002/10/07 16:33:35 nigels
Added CVS info
*/
#include "glt_config.h"
#include "glt_gl.h"
#include <iosfwd>
/*! \enum GltHorizontalAlignment
\brief Horizontal alignment
\ingroup GLT
*/
typedef enum GltHorizontalAlignment
{
GLT_ALIGN_LEFT = 0,
GLT_ALIGN_HCENTER,
GLT_ALIGN_RIGHT
} GltHorizontalAlignment;
/*! \enum GltVerticalAlignment
\brief Vertical alignment
\ingroup GLT
*/
typedef enum GltVerticalAlignment
{
GLT_ALIGN_TOP = 0,
GLT_ALIGN_VCENTER,
GLT_ALIGN_BOTTOM
} GltVerticalAlignment;
class GltTexture;
/*! \class GltViewport
\brief OpenGL Viewport Class
\ingroup GLT
Convenient manipulation of viewport information.
*/
class BoundingBox;
class GltViewport
{
public:
/// Constructor
GltViewport(bool getIt = false);
/// Copy constructor
GltViewport(const GltViewport &viewport);
/// Constructor
GltViewport(const GLint x,const GLint y,const GLint width,const GLint height);
/// Destructor
~GltViewport();
/// Is the viewport a valid size?
bool valid() const;
/// Get the current OpenGL viewport
void get();
/// Set the current OpenGL viewport
void set() const;
/// Set the current OpenGL viewport width and height
void set(const GLint width,const GLint height);
/// Set the current OpenGL viewport x, y, width and height
void set(const GLint x,const GLint y,const GLint width,const GLint height);
/// Left position of viewport
GLint &x();
/// Right position of viewport
GLint &y();
/// Width of viewport
GLint &width();
/// Height of viewport
GLint &height();
/// Left position of viewport
const GLint &x() const;
/// Right position of viewport
const GLint &y() const;
/// Width of viewport
const GLint &width() const;
/// Height of viewport
const GLint &height() const;
/// Viewport size, in pixels
const GLint pixels() const;
///
operator GLint *();
///
operator const GLint *() const;
/// Resize the viewport
bool resize(const GLint width,const GLint height);
/// Resize the viewport
bool resize(const GLint x,const GLint y,const GLint width,const GLint height);
/// Resize the viewport to fit a texture
bool resize(const GltTexture &texture);
/// Resize the viewport to fit an (image-space) bounding box
bool resize(const BoundingBox &box);
/// Position viewport horizontally, relative to another viewport
bool align(const GltHorizontalAlignment &align,const GltViewport &window);
/// Position viewport vetically, relative to another viewport
bool align(const GltVerticalAlignment &align,const GltViewport &window);
/// Shrink a viewport by a particular margin (in pixels)
bool shrink(const GLint w);
//
/// Assignment operator
GltViewport &operator=(const GltViewport &viewport);
/// Compare viewports
bool operator==(const GltViewport &viewport) const;
/// Compare viewports
bool operator!=(const GltViewport &viewport) const;
//
/// Draw a covering quad relative to viewport
void drawQuad() const;
/// Draw surrounding lines relative to viewport
void drawLines() const;
private:
GLint _viewport[4];
};
#endif
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