Add has_unique_axis()

2 files changed, 23 insertions, 1 deletions

diff --git a/libcrystfel/src/cell-utils.c b/libcrystfel/src/cell-utils.c
index b2708fb2..31ba9d35 100644
--- a/libcrystfel/src/cell-utils.c
+++ b/libcrystfel/src/cell-utils.c
@@ -116,6 +116,28 @@ LatticeType lattice_from_str(const char *s)
 }
 
 
+int has_unique_axis(LatticeType l)
+{
+	switch ( l )
+	{
+		case L_MONOCLINIC :
+		case L_HEXAGONAL :
+		case L_TETRAGONAL :
+		return 1;
+
+		case L_TRICLINIC :
+		case L_ORTHORHOMBIC :
+		case L_RHOMBOHEDRAL :
+		case L_CUBIC :
+		return 0;
+
+		default:
+		ERROR("Unrecognised lattice type %i\n", l);
+		return 1;
+	}
+}
+
+
 static int check_centering(char cen)
 {
 	switch ( cen ) {
diff --git a/libcrystfel/src/cell-utils.h b/libcrystfel/src/cell-utils.h
index 8eefe800..b473a4c5 100644
--- a/libcrystfel/src/cell-utils.h
+++ b/libcrystfel/src/cell-utils.h
@@ -68,7 +68,7 @@ extern UnitCell *uncenter_cell(UnitCell *in, IntegerMatrix **pC,
                                RationalMatrix **pCi);
 
 extern int bravais_lattice(UnitCell *cell);
-
+extern int has_unique_axis(LatticeType l);
 extern int right_handed(UnitCell *cell);
 
 extern const char *str_lattice(LatticeType l);