Function gmtplot_set_gridcross_limbs

src/gmt_plot.c:2148–2159

}

GMT_LOCAL void gmtplot_set_gridcross_limbs (struct GMT_CTRL *GMT, unsigned int axis, unsigned int kind, double value, unsigned int *B, unsigned int *E) {
	*B = *E = 0;	/* Default is symmetric tick */
	if (GMT->current.setting.map_grid_cross_type[kind] == GMT_CROSS_SYMM) return;	/* Symmetric tick */
	if (gmt_M_is_zero (value)) return;	/* Symmetrical as well for zero */
	if (gmt_M_type (GMT, GMT_IN, axis) == GMT_IS_LON) {	/* Worry about longitudes */
		if (doubleAlmostEqualZero (fabs (value), 180.0)) return;	/* Symmetrical at both 0 and 180 longitude */
		if (value > 0.0 && value < 180.0) *B = 1; else *E = 1;	/* One-sided */
	}
	else {
		if (value > 0.0) *B = 1; else *E = 1;	/* One-sided */
	}
}

GMT_LOCAL void gmtplot_map_gridticks (struct GMT_CTRL *GMT, struct PSL_CTRL *PSL, double w, double e, double s, double n) {
	/* Draw symmetric or asymmetric grid ticks along the courser gridlines for parallels and meridians */