diff -r 4bec0525ef1b -r 93ec4d630346 src/linetypes/quadrilateral.h
--- a/src/linetypes/quadrilateral.h	Thu Mar 19 21:06:06 2020 +0200
+++ b/src/linetypes/quadrilateral.h	Wed Mar 25 16:07:20 2020 +0200
@@ -6,24 +6,11 @@
 	class Quadrilateral;
 }
 
-class ldraw::Quadrilateral : public ColoredObject
+class ldraw::Quadrilateral : public PolygonObject<4>
 {
 public:
-	Quadrilateral() = default;
-	Quadrilateral(
-		const glm::vec3 &point_1,
-		const glm::vec3 &point_2,
-		const glm::vec3 &point_3,
-		const glm::vec3 &point_4,
-		Color colorIndex = ldraw::mainColor);
-	Quadrilateral(const std::array<glm::vec3, 4>& vertices, const Color color);
-	QVariant getProperty(Property id) const override;
+	using PolygonObject<4>::PolygonObject;
 	QString textRepresentation() const override;
 	void getPolygons(std::vector<gl::Polygon>& polygons, GetPolygonsContext* context) const override;
 	void invert() override;
-	int numPoints() const override;
-	const glm::vec3& getPoint(int index) const override;
-	glm::vec3 points[4] = {{}};
-protected:
-	void setProperty(SetPropertyResult* result, const PropertyKeyValue& pair) override;
 };