GRASS GIS 8 Programmer's Manual 8.2.0(2022)-exported
rowcol.h
Go to the documentation of this file.
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 */