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This patch tries to avoid the logic bug described in #8751 #8752

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Merged
joa-quim merged 1 commit into from
Jun 21, 2025
Merged

This patch tries to avoid the logic bug described in #8751 #8752

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8 changes: 5 additions & 3 deletions src/gmt_grdio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2236,7 +2236,7 @@ void gmt_grd_init (struct GMT_CTRL *GMT, struct GMT_GRID_HEADER *header, struct
}
}

void gmt_grd_shift (struct GMT_CTRL *GMT, struct GMT_GRID *G, double shift) {
void gmt_grd_shift(struct GMT_CTRL *GMT, struct GMT_GRID *G, double shift) {
/* Rotate geographical, global grid in e-w direction
* This function will shift a grid by shift degrees.
* It is only called when we know the grid is geographic. */
Expand Down Expand Up @@ -2266,8 +2266,10 @@ void gmt_grd_shift (struct GMT_CTRL *GMT, struct GMT_GRID *G, double shift) {
G->header->wesn[XHI] += 360.0;
}
else if (G->header->wesn[XHI] > 360.0) {
G->header->wesn[XLO] -= 360.0;
G->header->wesn[XHI] -= 360.0;
while (G->header->wesn[XHI] > 360.0) { /* Make sure we are in the range [0,360] */
G->header->wesn[XLO] -= 180.0;
G->header->wesn[XHI] -= 180.0;
}
}

gridline = (width < (int)G->header->n_columns); /* Gridline-registrered grids will have width = n_columns-1, pixel grids have width = n_columns */
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