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


	/****************************************************************/
	/* nom: grid */
	/* auteur: Jean-Paul Kneib */
	/* date: 10/02/92 */
	/* place: Toulouse
	* Initialize the gimage global variable in a rectangular shape.
	* gimage is defined with G.ngrid^2 (number in grille section)
	* coordinates that map the field of study defined in the champ
	* section.
	*
	***************************************************************/
	void grid()
	{
	const extern struct g_mode M;
	const extern struct g_grille G;
	const extern struct g_frame F;
	extern struct point gimage[NGGMAX][NGGMAX];

	double I, J, N;
	register int i, j;

	NPRINTF(stderr, "SET: Grid XY %dx%d\n", G.ngrid, G.ngrid);

	for (i = 0; i < G.ngrid; i++)
	for (j = 0; j < G.ngrid; j++)
	{
	I = i;
	J = j;
	N = G.ngrid - 1;
	I = I / N;
	J = J / N;
	gimage[i][j].x = F.xmin + I * (F.xmax - F.xmin);
	gimage[i][j].y = F.ymin + J * (F.ymax - F.ymin);
	};

	}