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/**
* $Id$
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* 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.
*
* 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.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
* @author Maarten Gribnau
* @date March 12, 2001
*/
#ifndef _H_IMG_Line
#define _H_IMG_Line
#include "IMG_Types.h"
#include <math.h>
/**
* A line from a start to an end point.
* Used for drawing lines in images.
* @author Maarten Gribnau
* @date March 6, 2001
*/
class IMG_Line {
public:
/**
* Constructs a line with the given values.
* @param xs start point x-coordinate
* @param ys start point y-coordinate
* @param xe end point x-coordinate
* @param ye end point y-coordinate
*/
IMG_Line(TInt32 xs=0, TInt32 ys=0, TInt32 xe=0, TInt32 ye=0)
: m_xs(xs), m_ys(ys), m_xe(xe), m_ye(ye) {}
/**
* Copy constructor.
* @param l line to copy
*/
IMG_Line(const IMG_Line& l)
: m_xs(l.m_xs), m_ys(l.m_ys), m_xe(l.m_xe), m_ye(l.m_ye) {}
/**
* Destructor.
*/
virtual ~IMG_Line() {};
/**
* Access to line length.
* @return length of the line.
*/
virtual inline float getLength() const;
/**
* Sets all members of the line.
* @param xs start point x-coordinate
* @param ys start point y-coordinate
* @param xe end point x-coordinate
* @param ye end point y-coordinate
*/
virtual inline void set(TInt32 xs, TInt32 ys, TInt32 xe, TInt32 ye);
/**
* Returns whether this line is empty.
* Empty line are lines that have length==0.
* @return boolean value (true==empty line)
*/
virtual inline bool isEmpty() const;
/**
* Returns point at given value for line parameter.
* Calculates the coordinates of a point on the line.
* @param t line parameter value (0<=t<=1) of the point requested.
* @param x x-coordinate of the point.
* @param y y-coordinate of the point.
*/
virtual inline void getPoint(float t, TInt32& x, TInt32& y) const;
/** Start point x-coordinate */
TInt32 m_xs;
/** Start point y-coordinate */
TInt32 m_ys;
/** End point x-coordinate */
TInt32 m_xe;
/** End point y-coordinate */
TInt32 m_ye;
};
inline float IMG_Line::getLength() const
{
TInt32 dx = m_xe - m_xs;
TInt32 dy = m_ye - m_ys;
return ((float)::sqrt(((float)dx)*dx + ((float)dy)*dy));
}
inline void IMG_Line::set(TInt32 xs, TInt32 ys, TInt32 xe, TInt32 ye)
{
m_xs = xs; m_ys = ys; m_xe = xe; m_ye = ye;
}
inline bool IMG_Line::isEmpty() const
{
return (getLength() <= 0);
}
inline void IMG_Line::getPoint(float t, TInt32& x, TInt32& y) const
{
x = (TInt32) (((float)m_xs) + (t * (m_xe - m_xs)));
y = (TInt32) (((float)m_ys) + (t * (m_ye - m_ys)));
}
#endif // _H_IMG_Line
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