GRASS GIS 8 Programmer's Manual 8.4.1(2025)-45ca3179ab
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rowcol.h
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1#ifndef _ROWCOL_H
2#define _ROWCOL_H
3
4/* these defines work with modeling coordinates only */
5
6/* TODO: avoid integer overflow */
7
8/* view resolutions */
9#define VXRES(gs) (gs->x_mod * gs->xres)
10#define VYRES(gs) (gs->y_mod * gs->yres)
11
12/* number of viewres rows/cols */
13#define VROWS(gs) (int)((gs->rows - 1) / gs->y_mod)
14#define VCOLS(gs) (int)((gs->cols - 1) / gs->x_mod)
15
16/* data row & col to offset */
17#define DRC2OFF(gs, drow, dcol) (int)((dcol) + (drow)*gs->cols)
18
19/* ycoord/xcoord to data row/col */
20#define Y2DROW(gs, py) (int)((gs->yrange - (py)) / gs->yres)
21#define X2DCOL(gs, px) (int)((px) / gs->xres)
22
23/* ycoord/xcoord to offset */
24#define XY2OFF(gs, px, py) (int)DRC2OFF(gs, Y2DROW(gs, py), X2DCOL(gs, px))
25
26/* ycoord/xcoord to viewres row/col */
27#define Y2VROW(gs, py) (int)((gs->yrange - (py)) / (gs->yres * gs->y_mod))
28#define X2VCOL(gs, px) (int)((px) / (gs->xres * gs->x_mod))
29
30/* viewres row/col to data row/col */
31#define VROW2DROW(gs, vrow) (int)(gs->y_mod * (vrow))
32#define VCOL2DCOL(gs, vcol) (int)(gs->x_mod * (vcol))
33
34/* data row/col to ycoord/xcoord */
35#define DROW2Y(gs, drow) (gs->yrange - ((drow)*gs->yres))
36#define DCOL2X(gs, dcol) ((dcol)*gs->xres)
37
38/* viewres row/col to ycoord/xcoord */
39#define VROW2Y(gs, vrow) (gs->yrange - ((vrow)*gs->yres * gs->y_mod))
40#define VCOL2X(gs, vcol) ((vcol)*gs->xres * gs->x_mod)
41
42#endif /* _ROWCOL_H */