220 lines
4.5 KiB
C++
220 lines
4.5 KiB
C++
/************************/
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/* Routines de rotation */
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/************************/
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/* Fichier TRIGO.CPP */
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#include "fctsys.h"
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#define global extern
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#include "trigo.h"
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/***********************************/
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int ArcTangente( int dy, int dx )
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/***********************************/
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/* Retourne l'arc tangente en 0.1 degres du vecteur de coord dx, dy
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* entre -1800 et 1800
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* Analogue a atan2 ( mais plus rapide pour les calculs si
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* l'angle est souvent 0, -1800, ou +- 900
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*/
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{
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double fangle;
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if( dy == 0 )
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{
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if( dx >= 0 )
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return 0;
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else
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return -1800;
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}
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if( dx == 0 )
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{
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if( dy >= 0 )
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return 900;
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else
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return -900;
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}
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if( dx == dy )
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{
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if( dx >= 0 )
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return 450;
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else
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return -1800 + 450;
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}
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if( dx == -dy )
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{
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if( dx >= 0 )
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return -450;
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else
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return 1800 - 450;
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}
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fangle = atan2( (double) dy, (double) dx ) / M_PI * 1800;
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return (int) round( fangle );
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}
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/*********************************************/
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void RotatePoint( int* pX, int* pY, int angle )
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/*********************************************/
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/*
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* Fonction surchargee!
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* calcule les nouvelles coord du point de coord pX, pY,
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* pour une rotation de centre 0, 0, et d'angle angle ( en 1/10 degre)
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*/
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{
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float fpx, fpy;
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int tmp;
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while( angle < 0 )
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angle += 3600;
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while( angle >= 3600 )
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angle -= 3600;
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if( angle == 0 )
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return;
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/* Calcul des coord :
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* coord: xrot = y*sin + x*cos
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* yrot = y*cos - x*sin
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*/
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if( angle == 900 ) /* sin = 1, cos = 0 */
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{
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tmp = *pX;
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*pX = *pY;
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*pY = -tmp;
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}
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else if( angle == 1800 ) /* sin = 0, cos = -1 */
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{
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*pX = -*pX;
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*pY = -*pY;
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}
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else if( angle == 2700 ) /* sin = -1, cos = 0 */
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{
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tmp = *pX;
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*pX = -*pY;
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*pY = tmp;
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}
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else
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{
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fpx = (*pY * fsinus[angle]) + (*pX * fcosinus[angle]);
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fpy = (*pY * fcosinus[angle]) - (*pX * fsinus[angle]);
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*pX = (int) round( fpx );
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*pY = (int) round( fpy );
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}
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}
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/************************************************************/
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void RotatePoint( int* pX, int* pY, int cx, int cy, int angle )
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/*************************************************************/
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/*
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* Fonction surchargee!
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* calcule les nouvelles coord du point de coord pX, pY,
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* pour une rotation de centre cx, cy, et d'angle angle ( en 1/10 degre)
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*/
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{
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int ox, oy;
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ox = *pX - cx;
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oy = *pY - cy;
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RotatePoint( &ox, &oy, angle );
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*pX = ox + cx;
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*pY = oy + cy;
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}
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/*****************************************************************/
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void RotatePoint( wxPoint* point, const wxPoint& centre, int angle )
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/*****************************************************************/
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/*
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* Fonction surchargee!
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* calcule les nouvelles coord du point point,
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* pour une rotation de centre centre, et d'angle angle ( en 1/10 degre)
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*/
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{
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int ox, oy;
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ox = point->x - centre.x;
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oy = point->y - centre.y;
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RotatePoint( &ox, &oy, angle );
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point->x = ox + centre.x;
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point->y = oy + centre.y;
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}
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/*************************************************************************/
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void RotatePoint( double* pX, double* pY, double cx, double cy, int angle )
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/*************************************************************************/
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{
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double ox, oy;
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ox = *pX - cx;
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oy = *pY - cy;
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RotatePoint( &ox, &oy, angle );
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*pX = ox + cx;
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*pY = oy + cy;
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}
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/*************************************************/
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void RotatePoint( double* pX, double* pY, int angle )
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/*************************************************/
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/* Calcul des coord :
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* coord: xrot = y*sin + x*cos
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* yrot = y*cos - x*sin
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*/
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{
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double tmp;
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while( angle < 0 )
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angle += 3600;
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while( angle >= 3600 )
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angle -= 3600;
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if( angle == 0 )
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return;
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if( angle == 900 ) /* sin = 1, cos = 0 */
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{
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tmp = *pX;
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*pX = *pY;
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*pY = -tmp;
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}
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else if( angle == 1800 ) /* sin = 0, cos = -1 */
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{
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*pX = -*pX;
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*pY = -*pY;
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}
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else if( angle == 2700 ) /* sin = -1, cos = 0 */
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{
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tmp = *pX;
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*pX = -*pY;
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*pY = tmp;
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}
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else
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{
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double fpx = (*pY * fsinus[angle]) + (*pX * fcosinus[angle]);
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double fpy = (*pY * fcosinus[angle]) - (*pX * fsinus[angle]);
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*pX = fpx;
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*pY = fpy;
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}
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}
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