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rowcol.h
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#ifndef _ROWCOL_H
#define _ROWCOL_H
/* these defines work with modeling coordinates only */
/* TODO: avoid integer overflow */
/* view resolutions */
#define VXRES(gs) (gs->x_mod * gs->xres)
#define VYRES(gs) (gs->y_mod * gs->yres)
/* number of viewres rows/cols */
#define VROWS(gs) (int)((gs->rows - 1) / gs->y_mod)
#define VCOLS(gs) (int)((gs->cols - 1) / gs->x_mod)
/* data row & col to offset */
#define DRC2OFF(gs, drow, dcol) (int)((dcol) + (drow) * gs->cols)
/* ycoord/xcoord to data row/col */
#define Y2DROW(gs, py) (int)((gs->yrange - (py)) / gs->yres)
#define X2DCOL(gs, px) (int)((px) / gs->xres)
/* ycoord/xcoord to offset */
#define XY2OFF(gs, px, py) (int)DRC2OFF(gs, Y2DROW(gs, py), X2DCOL(gs, px))
/* ycoord/xcoord to viewres row/col */
#define Y2VROW(gs, py) (int)((gs->yrange - (py)) / (gs->yres * gs->y_mod))
#define X2VCOL(gs, px) (int)((px) / (gs->xres * gs->x_mod))
/* viewres row/col to data row/col */
#define VROW2DROW(gs, vrow) (int)(gs->y_mod * (vrow))
#define VCOL2DCOL(gs, vcol) (int)(gs->x_mod * (vcol))
/* data row/col to ycoord/xcoord */
#define DROW2Y(gs, drow) (gs->yrange - ((drow) * gs->yres))
#define DCOL2X(gs, dcol) ((dcol) * gs->xres)
/* viewres row/col to ycoord/xcoord */
#define VROW2Y(gs, vrow) (gs->yrange - ((vrow) * gs->yres * gs->y_mod))
#define VCOL2X(gs, vcol) ((vcol) * gs->xres * gs->x_mod)
#endif /* _ROWCOL_H */