diff -r b54b350dff5d -r e3fe3617b631 src/tools/drawtool.cpp
--- a/src/tools/drawtool.cpp	Fri Aug 27 00:55:32 2021 +0300
+++ b/src/tools/drawtool.cpp	Fri Aug 27 14:38:56 2021 +0300
@@ -86,7 +86,7 @@
 	this->previewPolygon.back() = this->previewPoint;
 	if (this->previewPolygon.size() > 2)
 	{
-		this->isconcave = not geom::convex(this->previewPolygon);
+		this->isconcave = not geom::isConvex(this->previewPolygon);
 	}
 }