kicad/include/trigo.h

275 lines
9.0 KiB
C++

/**
* @file trigo.h
*/
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2013 KiCad Developers, see change_log.txt for contributors.
*
* 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.
*
* 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, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef TRIGO_H
#define TRIGO_H
#include <math.h>
#include <wx/gdicmn.h> // For wxPoint
/**
* Function IsPointOnSegment
* @param aSegStart The first point of the segment S.
* @param aSegEnd The second point of the segment S.
* @param aTestPoint The point P to test.
* @return true if the point P is on the segment S.
* faster than TestSegmentHit() because P should be exactly on S
* therefore works fine only for H, V and 45 deg segm.
* suitable for busses and wires in eeschema, otherwise use TestSegmentHit()
*/
bool IsPointOnSegment( const wxPoint& aSegStart, const wxPoint& aSegEnd,
const wxPoint& aTestPoint );
/**
* Function SegmentIntersectsSegment
*
* @param a_p1_l1 The first point of the first line.
* @param a_p2_l1 The second point of the first line.
* @param a_p1_l2 The first point of the second line.
* @param a_p2_l2 The second point of the second line.
* @return bool - true if the two segments defined by four points intersect.
* (i.e. if the 2 segments have at least a common point)
*/
bool SegmentIntersectsSegment( const wxPoint &a_p1_l1, const wxPoint &a_p2_l1,
const wxPoint &a_p1_l2, const wxPoint &a_p2_l2 );
/*
* Calculate the new point of coord coord pX, pY,
* for a rotation center 0, 0, and angle in (1 / 10 degree)
*/
void RotatePoint( int *pX, int *pY, double angle );
/*
* Calculate the new point of coord coord pX, pY,
* for a rotation center cx, cy, and angle in (1 / 10 degree)
*/
void RotatePoint( int *pX, int *pY, int cx, int cy, double angle );
/*
* Calculates the new coord point point
* for a rotation angle in (1 / 10 degree)
*/
inline void RotatePoint( wxPoint* point, double angle )
{
RotatePoint( &point->x, &point->y, angle );
}
/*
* Calculates the new coord point point
* for a center rotation center and angle in (1 / 10 degree)
*/
void RotatePoint( wxPoint *point, const wxPoint & centre, double angle );
void RotatePoint( double *pX, double *pY, double angle );
void RotatePoint( double *pX, double *pY, double cx, double cy, double angle );
/* Return the arc tangent of 0.1 degrees coord vector dx, dy
* between -1800 and 1800
* Equivalent to atan2 (but faster for calculations if
* the angle is 0 to -1800, or + - 900)
* Lorenzo: In fact usually atan2 already has to do these optimizations
* (due to the discontinuity in tan) but this function also returns
* in decidegrees instead of radians, so it's handier
*/
double ArcTangente( int dy, int dx );
//! @brief Euclidean norm of a 2D vector
//! @param vector Two-dimensional vector
//! @return Euclidean norm of the vector
inline double EuclideanNorm( const wxPoint &vector )
{
// this is working with doubles
return hypot( vector.x, vector.y );
}
inline double EuclideanNorm( const wxSize &vector )
{
// this is working with doubles, too
return hypot( vector.x, vector.y );
}
//! @brief Compute the distance between a line and a reference point
//! Reference: http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html
//! @param linePointA Point on line
//! @param linePointB Point on line
//! @param referencePoint Reference point
inline double DistanceLinePoint( const wxPoint &linePointA,
const wxPoint &linePointB,
const wxPoint &referencePoint )
{
// Some of the multiple double casts are redundant. However in the previous
// definition the cast was (implicitly) done too late, just before
// the division (EuclideanNorm gives a double so from int it would
// be promoted); that means that the whole expression were
// vulnerable to overflow during int multiplications
return fabs( ( double(linePointB.x - linePointA.x) *
double(linePointA.y - referencePoint.y) -
double(linePointA.x - referencePoint.x ) *
double(linePointB.y - linePointA.y) )
/ EuclideanNorm( linePointB - linePointA ) );
}
//! @brief Test, if two points are near each other
//! @param pointA First point
//! @param pointB Second point
//! @param threshold The maximum distance
//! @return True or false
inline bool HitTestPoints( const wxPoint &pointA, const wxPoint &pointB,
double threshold )
{
wxPoint vectorAB = pointB - pointA;
// Compare the distances squared. The double is needed to avoid
// overflow during int multiplication
double sqdistance = (double)vectorAB.x * vectorAB.x +
(double)vectorAB.y * vectorAB.y;
return sqdistance < threshold * threshold;
}
//! @brief Determine the cross product
//! @param vectorA Two-dimensional vector
//! @param vectorB Two-dimensional vector
inline double CrossProduct( const wxPoint &vectorA, const wxPoint &vectorB )
{
// As before the cast is to avoid int overflow
return (double)vectorA.x * vectorB.y - (double)vectorA.y * vectorB.x;
}
/**
* Function TestSegmentHit
* test for hit on line segment
* i.e. a reference point is within a given distance from segment
* @param aRefPoint = reference point to test
* @param aStart is the first end-point of the line segment
* @param aEnd is the second end-point of the line segment
* @param aDist = maximum distance for hit
*/
bool TestSegmentHit( const wxPoint &aRefPoint, wxPoint aStart,
wxPoint aEnd, int aDist );
/**
* Function GetLineLength
* returns the length of a line segment defined by \a aPointA and \a aPointB.
* See also EuclideanNorm and Distance for the single vector or four
* scalar versions
* @return Length of a line (as double)
*/
inline double GetLineLength( const wxPoint& aPointA, const wxPoint& aPointB )
{
// Implicitly casted to double
return hypot( aPointA.x - aPointB.x,
aPointA.y - aPointB.y );
}
// These are the usual degrees <-> radians conversion routines
inline double DEG2RAD( double deg ) { return deg * M_PI / 180.0; }
inline double RAD2DEG( double rad ) { return rad * 180.0 / M_PI; }
// These are the same *but* work with the internal 'decidegrees' unit
inline double DECIDEG2RAD( double deg ) { return deg * M_PI / 1800.0; }
inline double RAD2DECIDEG( double rad ) { return rad * 1800.0 / M_PI; }
/* These are templated over T (and not simply double) because eeschema
is still using int for angles in some place */
/// Normalize angle to be in the -360.0 .. 360.0:
template <class T> inline void NORMALIZE_ANGLE_360( T &Angle )
{
while( Angle < -3600 )
Angle += 3600;
while( Angle > 3600 )
Angle -= 3600;
}
/// Normalize angle to be in the 0.0 .. 360.0 range:
template <class T> inline void NORMALIZE_ANGLE_POS( T &Angle )
{
while( Angle < 0 )
Angle += 3600;
while( Angle >= 3600 )
Angle -= 3600;
}
/// Add two angles (keeping the result normalized). T2 is here
// because most of the time it's an int (and templates don't promote in
// that way)
template <class T, class T2> inline T AddAngles( T a1, T2 a2 )
{
a1 += a2;
NORMALIZE_ANGLE_POS( a1 );
return a1;
}
template <class T> inline void NEGATE_AND_NORMALIZE_ANGLE_POS( T &Angle )
{
Angle = -Angle;
while( Angle < 0 )
Angle += 3600;
while( Angle >= 3600 )
Angle -= 3600;
}
/// Normalize angle to be in the -90.0 .. 90.0 range
template <class T> inline void NORMALIZE_ANGLE_90( T &Angle )
{
while( Angle < -900 )
Angle += 1800;
while( Angle > 900 )
Angle -= 1800;
}
/// Normalize angle to be in the -180.0 .. 180.0 range
template <class T> inline void NORMALIZE_ANGLE_180( T &Angle )
{
while( Angle <= -1800 )
Angle += 3600;
while( Angle > 1800 )
Angle -= 3600;
}
/**
* Circle generation utility: computes r * sin(a)
* Where a is in decidegrees, not in radians.
*/
inline double sindecideg( double r, double a )
{
return r * sin( DECIDEG2RAD( a ) );
}
/**
* Circle generation utility: computes r * cos(a)
* Where a is in decidegrees, not in radians.
*/
inline double cosdecideg( double r, double a )
{
return r * cos( DECIDEG2RAD( a ) );
}
#endif