diff -r 000781318c36 -r b54b350dff5d src/geometry.h
--- a/src/geometry.h	Fri Jul 30 01:28:39 2021 +0300
+++ b/src/geometry.h	Fri Aug 27 00:55:32 2021 +0300
@@ -93,6 +93,7 @@
 	LineSegment2D bottom(const QRectF& rectangle);
 	LineSegment2D left(const QRectF& rectangle);
 	LineSegment2D right(const QRectF& rectangle);
+	bool convex(const std::vector<glm::vec3>& polygon);
 	struct ScalingExtract
 	{
 		glm::vec3 scaling;