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pscoast: fix offset after a -p90 #8981

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joa-quim merged 2 commits into from
Apr 16, 2026
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pscoast: fix offset after a -p90 #8981

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pscoast: fix offset after a -p90
joa-quim Apr 15, 2026
67ffe26
Apply this pathch only if -p has been used. This at least prevents br…
joa-quim Apr 15, 2026
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16 changes: 16 additions & 0 deletions src/gmt_map.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6524,6 +6524,22 @@ GMT_LOCAL int gmtmap_init_three_D (struct GMT_CTRL *GMT) {
GMT->current.proj.z_project.x_off = GMT->current.proj.z_project.view_x - x;
GMT->current.proj.z_project.y_off = GMT->current.proj.z_project.view_y - y;
}
else if (GMT->common.p.active && doubleAlmostEqualZero(GMT->current.proj.z_project.view_elevation, 90.0)) {
/* Pure z-rotation (elevation 90 = looking straight down). Place the map centre
* at (map.width/2, map.height/2) on page, so that the rotated disc/map centre
* stays at the same location a non-rotated plot would produce. We cannot just
* centre the bbox because perimeter sampling inflates it asymmetrically.
* See issue #8794. */
double wx, wy, xc, yc;
double world_x = (gmt_M_is_geographic(GMT, GMT_IN)) ? GMT->current.proj.central_meridian : 0.5 * (GMT->common.R.wesn[XLO] + GMT->common.R.wesn[XHI]);
double world_y = 0.5 * (GMT->common.R.wesn[YLO] + GMT->common.R.wesn[YHI]);
gmt_geo_to_xy(GMT, world_x, world_y, &wx, &wy); /* 2-D projected coords of map centre */
/* Apply the rotation part of gmt_xyz_to_xy (x_off=y_off=0) to get post-rotation position of centre */
xc = -wx * GMT->current.proj.z_project.cos_az + wy * GMT->current.proj.z_project.sin_az;
yc = -(wx * GMT->current.proj.z_project.sin_az + wy * GMT->current.proj.z_project.cos_az) * GMT->current.proj.z_project.sin_el;
GMT->current.proj.z_project.x_off = 0.5 * GMT->current.map.width - xc;
GMT->current.proj.z_project.y_off = 0.5 * GMT->current.map.height - yc;
}
else {
GMT->current.proj.z_project.x_off = -GMT->current.proj.z_project.xmin;
GMT->current.proj.z_project.y_off = -GMT->current.proj.z_project.ymin;
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