159 lines
5.5 KiB
C
159 lines
5.5 KiB
C
/**
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* @file trigo.h
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*/
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/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2013 KiCad Developers, see change_log.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef TRIGO_H
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#define TRIGO_H
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#include <math.h>
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#include <wx/gdicmn.h> // For wxPoint
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/*
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* Calculate the new point of coord coord pX, pY,
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* for a rotation center 0, 0, and angle in (1 / 10 degree)
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*/
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void RotatePoint( int *pX, int *pY, double angle );
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/*
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* Calculate the new point of coord coord pX, pY,
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* for a rotation center cx, cy, and angle in (1 / 10 degree)
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*/
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void RotatePoint( int *pX, int *pY, int cx, int cy, double angle );
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/*
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* Calculates the new coord point point
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* for a rotation angle in (1 / 10 degree)
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*/
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inline void RotatePoint( wxPoint* point, double angle )
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{
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RotatePoint( &point->x, &point->y, angle );
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}
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/*
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* Calculates the new coord point point
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* for a center rotation center and angle in (1 / 10 degree)
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*/
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void RotatePoint( wxPoint *point, const wxPoint & centre, double angle );
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void RotatePoint( double *pX, double *pY, double angle );
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void RotatePoint( double *pX, double *pY, double cx, double cy, double angle );
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/* Return the arc tangent of 0.1 degrees coord vector dx, dy
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* between -1800 and 1800
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* Equivalent to atan2 (but faster for calculations if
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* the angle is 0 to -1800, or + - 900)
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* Lorenzo: In fact usually atan2 already has to do these optimizations
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* (due to the discontinuity in tan) but this function also returns
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* in decidegrees instead of radians, so it's handier
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*/
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double ArcTangente( int dy, int dx );
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//! @brief Euclidean norm of a 2D vector
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//! @param vector Two-dimensional vector
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//! @return Euclidean norm of the vector
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inline double EuclideanNorm( const wxPoint &vector )
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{
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// this is working with doubles
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return hypot( vector.x, vector.y );
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}
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//! @brief Compute the distance between a line and a reference point
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//! Reference: http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html
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//! @param linePointA Point on line
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//! @param linePointB Point on line
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//! @param referencePoint Reference point
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inline double DistanceLinePoint( const wxPoint &linePointA,
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const wxPoint &linePointB,
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const wxPoint &referencePoint )
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{
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// Some of the multiple double casts are redundant. However in the previous
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// definition the cast was (implicitly) done too late, just before
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// the division (EuclideanNorm gives a double so from int it would
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// be promoted); that means that the whole expression were
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// vulnerable to overflow during int multiplications
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return fabs( ( double(linePointB.x - linePointA.x) *
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double(linePointA.y - referencePoint.y) -
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double(linePointA.x - referencePoint.x ) *
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double(linePointB.y - linePointA.y) )
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/ EuclideanNorm( linePointB - linePointA ) );
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}
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//! @brief Test, if two points are near each other
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//! @param pointA First point
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//! @param pointB Second point
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//! @param threshold The maximum distance
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//! @return True or false
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inline bool HitTestPoints( const wxPoint &pointA, const wxPoint &pointB,
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double threshold )
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{
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wxPoint vectorAB = pointB - pointA;
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// Compare the distances squared. The double is needed to avoid
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// overflow during int multiplication
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double sqdistance = (double)vectorAB.x * vectorAB.x +
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(double)vectorAB.y * vectorAB.y;
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return sqdistance < threshold * threshold;
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}
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//! @brief Determine the cross product
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//! @param vectorA Two-dimensional vector
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//! @param vectorB Two-dimensional vector
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inline double CrossProduct( const wxPoint &vectorA, const wxPoint &vectorB )
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{
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// As before the cast is to avoid int overflow
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return (double)vectorA.x * vectorB.y - (double)vectorA.y * vectorB.x;
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}
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/**
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* Function TestSegmentHit
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* test for hit on line segment
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* i.e. a reference point is within a given distance from segment
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* @param aRefPoint = reference point to test
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* @param aStart is the first end-point of the line segment
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* @param aEnd is the second end-point of the line segment
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* @param aDist = maximum distance for hit
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*/
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bool TestSegmentHit( const wxPoint &aRefPoint, wxPoint aStart,
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wxPoint aEnd, int aDist );
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/**
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* Function GetLineLength
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* returns the length of a line segment defined by \a aPointA and \a aPointB.
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* See also EuclideanNorm and Distance for the single vector or four
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* scalar versions
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* @return Length of a line (as double)
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*/
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inline double GetLineLength( const wxPoint& aPointA, const wxPoint& aPointB )
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{
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// Implicitly casted to double
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return hypot( aPointA.x - aPointB.x,
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aPointA.y - aPointB.y );
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}
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#endif
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