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//-*-C++-*-
/*
**************************************************************************
description
--------------------
copyright : (C) 2000-2001 by Andreas Zehender
email : zehender@kde.org
**************************************************************************
**************************************************************************
* *
* 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 PMLINES_H
#define PMLINES_H
#include <qptrlist.h>
#include <GL/gl.h>
#include "pmdebug.h"
/**
* Line to display with index of start and end point.
*
* Line of a @ref PMViewStructure. Only the indices in a @ref PMPointArray
* are stored.
*
* Optimized for OpenGL
*/
class PMLine
{
public:
/**
* Default constructor
*/
PMLine( )
{
m_start = 0;
m_end = 0;
}
/**
* Creates a line with start point si and end point ei. If si is greater
* than ei, si and ei are swapped.
*/
PMLine( const GLuint si, const GLuint ei )
{ m_start = si; m_end = ei; checkPoints( ); }
/**
* Sets the start point.
*/
void setStartPoint( GLuint si ) { m_start = si; checkPoints( ); }
/**
* Sets the end point.
*/
void setEndPoint( GLuint ei ) { m_end = ei; checkPoints( ); }
/**
* Returns the start point.
*/
GLuint startPoint( ) const { return m_start; }
/**
* Returns the end point.
*/
GLuint endPoint( ) const { return m_end; }
private:
/**
* Swaps the two points.
*/
void swapPoints( ) { GLuint help = m_start; m_start = m_end; m_end = help; }
/**
* Checks, if si < ei and swaps the two points if necessary
*/
void checkPoints( )
{
if( m_start == m_end ) kdError( PMArea ) << "Start index = end index in PMLine" << "\n";
if( m_start > m_end ) swapPoints( );
}
/**
* The start and end points (indices!)
*
* THESE MEMBERS HAVE TO BE THE ONLY ONE (for rendering with OpenGl)
*/
GLuint m_start, m_end;
};
typedef QPtrListIterator<PMLine> PMLineListIterator;
/**
* A list of @ref PMLine objects.
*
* This class stores all lines of a @ref PMViewStructure. A line is
* described by a start and end point. Only the indices in a @ref PMPointArray
* are stored.
*/
typedef QMemArray<PMLine> PMLineArray;
#endif
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