128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/**
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* @file trigo.h
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*/
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#ifndef TRIGO_H
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#define TRIGO_H
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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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static 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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*/
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int ArcTangente( int dy, int dx );
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/**
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* Function DistanceTest
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* Calculate the distance from mouse cursor to a line segment.
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* @return False if distance > threshold or true if distance <= threshold.
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*/
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bool DistanceTest( int seuil, int dx, int dy, int spot_cX, int spot_cY );
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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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double DistanceLinePoint( wxPoint linePointA, wxPoint linePointB, wxPoint referencePoint );
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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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double EuclideanNorm( wxPoint vector );
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//! @brief Vector between two points
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//! @param startPoint The start point
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//! @param endPoint The end point
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//! @return Vector between the points
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wxPoint TwoPointVector( wxPoint startPoint, wxPoint endPoint );
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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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bool HitTestPoints( wxPoint pointA, wxPoint pointB, double threshold );
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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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int CrossProduct( wxPoint vectorA, wxPoint vectorB );
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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. cursor within a given distance from segment
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* @param aRefPoint = cursor (point to test) coords
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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( wxPoint aRefPoint, wxPoint aStart, 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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* @return Length of a line.
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*/
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double GetLineLength( const wxPoint& aPointA, const wxPoint& aPointB );
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/*******************/
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/* Macro NEW_COORD */
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/*******************/
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/* Calculate coordinates to rotate around an axis
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* coord: xrot = y + x * sin * cos
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* yrot = y * cos - sin * x
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* either: xrot = (y + x * tg) * cos
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* yrot = (y - x * tg) * cos
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*
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* Cosine coefficients are loaded from a trigonometric table by 16 bit values.
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*/
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#define NEW_COORD( x0, y0 ) \
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do { \
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int itmp; \
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itmp = x0; \
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x0 = x0 + (int)( y0 * tg ); \
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y0 = y0 - (int)( itmp * tg ); \
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x0 = ( x0 * cosinus ) >> 8; \
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y0 = ( y0 * cosinus ) >> 8; \
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} while( 0 );
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#endif
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