diff -r edc716c1d8e1 -r f895379d7fab src/editmodes/circleMode.cpp
--- a/src/editmodes/circleMode.cpp	Sun Apr 12 23:02:26 2015 +0300
+++ b/src/editmodes/circleMode.cpp	Tue Jul 07 21:35:20 2015 +0300
@@ -37,14 +37,18 @@
 
 double CircleMode::getCircleDrawDist (int pos) const
 {
-	assert (m_drawedVerts.size() >= pos + 1);
-	Vertex v1 = (m_drawedVerts.size() >= pos + 2) ? m_drawedVerts[pos + 1] :
-		renderer()->coordconv2_3 (renderer()->mousePosition(), false);
-	Axis localx, localy;
-	renderer()->getRelativeAxes (localx, localy);
-	double dx = m_drawedVerts[0][localx] - v1[localx];
-	double dy = m_drawedVerts[0][localy] - v1[localy];
-	return Grid::Snap (sqrt ((dx * dx) + (dy * dy)), Grid::Coordinate);
+	if (m_drawedVerts.size() >= pos + 1)
+	{
+		Vertex v1 = (m_drawedVerts.size() >= pos + 2) ? m_drawedVerts[pos + 1] :
+			renderer()->coordconv2_3 (renderer()->mousePosition(), false);
+		Axis localx, localy;
+		renderer()->getRelativeAxes (localx, localy);
+		double dx = m_drawedVerts[0][localx] - v1[localx];
+		double dy = m_drawedVerts[0][localy] - v1[localy];
+		return Grid::Snap (sqrt ((dx * dx) + (dy * dy)), Grid::Coordinate);
+	}
+
+	return 0.0;
 }
 
 Matrix CircleMode::getCircleDrawMatrix (double scale)
@@ -63,7 +67,7 @@
 	{
 		if (transform[i] == 2)
 			transform[i] = scale;
-		elif (transform[i] == 1 and renderer()->camera() >= 3)
+		else if (transform[i] == 1 and renderer()->camera() >= 3)
 			transform[i] = -1;
 	}
 
@@ -91,14 +95,14 @@
 		transform = getCircleDrawMatrix (dist0);
 		circleOrDisc = true;
 	}
-	elif (dist0 == 0 or dist1 == 0)
+	else if (dist0 == 0 or dist1 == 0)
 	{
 		// If either radii is 0, use a disc.
 		refFile = GetPrimitive (::Disc, segments, divisions, 0);
 		transform = getCircleDrawMatrix ((dist0 != 0) ? dist0 : dist1);
 		circleOrDisc = true;
 	}
-	elif (g_RingFinder.findRings (dist0, dist1))
+	else if (g_RingFinder.findRings (dist0, dist1))
 	{
 		// The ring finder found a solution, use that. Add the component rings to the file.
 		for (const RingFinder::Component& cmp : g_RingFinder.bestSolution()->getComponents())
@@ -155,7 +159,7 @@
 		}
 	}
 
-	if (circleOrDisc and refFile != null)
+	if (circleOrDisc and refFile != nullptr)
 	{
 		LDSubfilePtr ref = LDSpawn<LDSubfile>();
 		ref->setFileInfo (refFile);
@@ -165,13 +169,13 @@
 		objs << ref;
 	}
 
-	unless (objs.isEmpty())
+	if (not objs.isEmpty())
 	{
 		Axis relZ = renderer()->getRelativeZ();;
 		const int l (relZ == X ? 1 : 0);
 		const int m (relZ == Y ? 1 : 0);
 		const int n (relZ == Z ? 1 : 0);
-		RotateObjects (l, m, n, -m_angleOffset, objs);
+		rotateObjects (l, m, n, -m_angleOffset, objs);
 	}
 
 	finishDraw (objs);