113 lines
4.1 KiB
C
113 lines
4.1 KiB
C
/***************************************************************************
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mathfuncs.h - description
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-------------------
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begin : Thu Sep 6 2001
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copyright : (C) 2001 by Michael Speck
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email : kulkanie@gmx.net
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef __MATH_H
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#define __MATH_H
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/* integer vector */
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typedef struct {
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int x,y;
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} ICoord;
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typedef struct {
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float x; /* position if vertical line */
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int vertical; /* if this is set monotony is not computed */
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float m; /* monotony */
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float n; /* y_offset */
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} Line;
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/* integer line */
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typedef struct {
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int x; /* position if vertical line */
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int vertical; /* if this is set monotony is not computed */
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int m_4096; /* monotony * 4096 */
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int n; /* y_offset */
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} ILine;
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/*
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====================================================================
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Return vector struct with the specified coordinates.
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====================================================================
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*/
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Vector vector_get( float x, float y );
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/*
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====================================================================
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Give vector the normed length of 1.
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====================================================================
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*/
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void vector_norm( Vector *v );
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/*
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====================================================================
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Return monotony of vector. If vertical return 0
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====================================================================
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*/
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float vector_monotony( Vector v );
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/*
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====================================================================
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Set length of a vector.
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====================================================================
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*/
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void vector_set_length( Vector *v, float length );
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/*
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====================================================================
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Initiate a line struct.
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====================================================================
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*/
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void line_set( Line *line, float x, float y, float m );
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void line_set_vert( Line *line, float x );
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void line_set_hori( Line *line, float y );
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/*
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====================================================================
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Intersect lines and set 'pos' to intersecting point.
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Return Value: True if lines intersect.
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====================================================================
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*/
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int line_intersect( Line *line, Line *target, Coord *pos );
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/*
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====================================================================
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Initiate a line struct.
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====================================================================
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*/
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void iline_set( ILine *line, int x, int y, int m_4096 );
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void iline_set_vert( ILine *line, int x );
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void iline_set_hori( ILine *line, int y );
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/*
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====================================================================
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Intersect lines and set 'pos' to intersecting point.
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Return Value: True if lines intersect.
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====================================================================
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*/
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int iline_intersect( ILine *line, ILine *target, ICoord *pos );
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/*
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====================================================================
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Intersect line pos+t*v with circle (x+m)²=r²
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Important length of v MUST be 1.
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Return Value: True if intersecting, Intersecting points
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====================================================================
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*/
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int circle_intersect( Vector m, int r, Vector pos, Vector v, Vector *t1, Vector *t2 );
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/* convert vector to angle/2 0-180 and vice versa */
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void init_angles( void );
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int vec2angle( Vector *vec );
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void angle2vec( int angle, Vector *vec );
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#endif
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