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When testing that central meridian < |180| take of the [-180 180] vs [0 360] ambiguity. #8404

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Mar 15, 2024
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When testing that central meridian < |180| take of the [-180 180] vs [0 360] ambiguity. #8404

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When testing that central meridian < |180| take of the [-180 180] vs … 
…[0 360] ambiguity.

Fix #8403
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@joa-quim
joa-quim committed Mar 15, 2024
commit f2b4db14a1b418a919f926a96d3a7efb4124d698
14 changes: 11 additions & 3 deletions src/gmt_map.c
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Original file line number Diff line number Diff line change
Expand Up @@ -384,9 +384,17 @@ GMT_LOCAL int gmtmap_cyl_validate_clon (struct GMT_CTRL *GMT, unsigned int mode)
}
}
else if (!GMT->common.R.oblique) { /* For regional (<360) areas we cannot have clon > 180 away from either boundary */
double de, dw;
dw = fabs (GMT->current.proj.pars[0] - GMT->common.R.wesn[XLO]); if (dw >= 360) dw -= 360.0;
de = fabs (GMT->current.proj.pars[0] - GMT->common.R.wesn[XHI]); if (de >= 360) de -= 360.0;
double de, dw, clon;
bool is_clon0360 = GMT->current.proj.pars[0] > 180; /* Is the central meridian in the [0 360] range */;
bool is_reg0360 = GMT->common.R.wesn[XLO] > 180 || GMT->common.R.wesn[XHI] > 180; /* Is the region in the [0 360] range */

clon = GMT->current.proj.pars[0];
if (is_clon0360 && !is_reg0360) /* Must take care of not checking for clon < 180 from either boundary and mix -Rg & -Rd */
clon -= 360.0;
else if (!is_clon0360 && is_reg0360)
clon += 360.0;
dw = fabs (clon - GMT->common.R.wesn[XLO]); if (dw >= 360) dw -= 360.0;
de = fabs (clon - GMT->common.R.wesn[XHI]); if (de >= 360) de -= 360.0;
if (dw > 180.0 || de > 180.0) {
if (mode == 2) { /* Yield an error if fixed central longitude, range < 360, and exceed 180 to the border from central longitude */
static char *border[2] = {"Western", "Eastern"};
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