/usr/include/ClanLib-1.0/ClanLib/Core/Math/line_math.h is in libclanlib-dev 1.0~svn3827-3build1.
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** ClanLib SDK
** Copyright (c) 1997-2005 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** Magnus Norddahl
** (if your name is missing here, please add it)
*/
//! clanCore="Math"
//! header=core.h
#ifndef header_line_math
#define header_line_math
#ifdef CL_API_DLL
#ifdef CL_CORE_EXPORT
#define CL_API_CORE __declspec(dllexport)
#else
#define CL_API_CORE __declspec(dllimport)
#endif
#else
#define CL_API_CORE
#endif
#include "point.h"
//: Math operations on 2D lines.
//- !group=Core/Math!
//- !header=core.h!
class CL_API_CORE CL_LineMath
{
public:
// Operations:
//: Return the distance from a point to a line.
//param float x: X coordinate of point.
//param float y: Y coordinate of point.
//param CL_Pointf point: The point.
//param float *line: Pointer to float array with elements {x1,y1,x2,y2}.
static float distance_to_line(const CL_Pointf &point, float *line);
static float distance_to_line(float x, float y, float *line);
//: Return true if two line segments intersect.
//param float *lineA: First line. Pointer to float array with elements {x1,y1,x2,y2}.
//param float *lineB: Second line. Pointer to float array with elements {x1,y1,x2,y2}.
//param bool collinear_intersect: set if a collision is reported when all points are on the same line.
static bool intersects( float *lineA, float *lineB, bool collinear_intersect=false );
//: Return true if two line segments are collinear. (All points are on the same line.)
//param float *lineA: First line. Pointer to float array with elements {x1,y1,x2,y2}.
//param float *lineB: Second line. Pointer to float array with elements {x1,y1,x2,y2}.
static bool collinear( float *lineA, float *lineB );
//: Return the intersection point of two lines.
//param float *lineA: First line. Pointer to float array with elements {x1,y1,x2,y2}.
//param float *lineB: Second line. Pointer to float array with elements {x1,y1,x2,y2}.
static CL_Pointf get_intersection( float *lineA, float *lineB );
//: Return [<0, 0, >0] if the Point P is right, on or left of the line trough A,B
//param float x: x coordinate of the point being tested.
//param float y: y coordinate of the point being tested.
//param float *line: The line. A pointer to a float array with the elements {x1,y1,x2,y2}.
//param float line_x1, line_y1: First point defining the line.
//param float line_x2, line_y2: Second point defining the line.
//param CL_Pointf P: Test point.
//param CL_Pointf A: First point defining the line.
//param CL_Pointf B: Second point defining the line.
static float point_right_of_line( float x, float y, float *line );
static float point_right_of_line( float x, float y, float line_x1, float line_y1, float line_x2, float line_y2 );
static float point_right_of_line( const CL_Pointf &A, const CL_Pointf &B, const CL_Pointf &P );
//: Return the midpoint of the line from point A to point B.
//param CL_Pointf A: point A
//param CL_Pointf B: point B
static CL_Pointf midpoint( const CL_Pointf &A, const CL_Pointf &B );
//: Return the normal vector of the line from point A to point B.
//param CL_Pointf A: point A
//param CL_Pointf B: point B
//param float *line: pointer to line vertices {x1, y1, x2, y2}
static CL_Pointf normal( const CL_Pointf &A, const CL_Pointf &B );
static CL_Pointf normal( float x1, float y1, float x2, float y2 );
static CL_Pointf normal( float *line );
};
#endif
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