rotation.c
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	#include<stdio.h>
	#include<math.h>
	#include<fonction.h>
	#include<constant.h>
	#include<dimension.h>
	#include<structure.h>

	/****************************************************************/
	/* nom: rotation */
	/* auteur: Jean-Paul Kneib */
	/* date: 10/02/92 */
	/* place: Toulouse */
	/****************************************************************/
	/* Global variables used :
	* - none
	* */
	struct point rotation(struct point P, double theta)
	{
	struct point Q;

	Q.x = P.xcos(theta) + P.ysin(theta);
	Q.y = P.ycos(theta) - P.xsin(theta);

	return(Q);
	}