diff -r fe67489523b5 -r 6e838748867b src/objecttypes/polygon.cpp
--- a/src/objecttypes/polygon.cpp	Sun Nov 03 17:57:21 2019 +0200
+++ b/src/objecttypes/polygon.cpp	Sun Nov 03 18:09:47 2019 +0200
@@ -1,22 +1,22 @@
 #include "polygon.h"
 
-modelobjects::Triangle::Triangle(
+linetypes::Triangle::Triangle(
 	const Vertex& point_1,
 	const Vertex& point_2,
 	const Vertex& point_3,
 	Color color_index) :
-	ColoredBaseObject{color_index},
+	ColoredObject{color_index},
 	points{point_1, point_2, point_3}
 {
 }
 
-modelobjects::Triangle::Triangle(const QVector<Vertex>& vertices, const Color color) :
-	ColoredBaseObject{color},
+linetypes::Triangle::Triangle(const QVector<Vertex>& vertices, const Color color) :
+	ColoredObject{color},
 	points{vertices[0], vertices[1], vertices[2]}
 {
 }
 
-QVariant modelobjects::Triangle::getProperty(const Property id) const
+QVariant linetypes::Triangle::getProperty(const Property id) const
 {
 	switch (id)
 	{
@@ -27,11 +27,11 @@
 	case Property::Point3:
 		return points[2];
 	default:
-		return ColoredBaseObject::getProperty(id);
+		return ColoredObject::getProperty(id);
 	}
 }
 
-auto modelobjects::Triangle::setProperty(Property id, const QVariant& value)
+auto linetypes::Triangle::setProperty(Property id, const QVariant& value)
 	-> SetPropertyResult
 {
 	switch (id)
@@ -46,11 +46,11 @@
 		points[2] = value.value<Vertex>();
 		return SetPropertyResult::Success;
 	default:
-		return ColoredBaseObject::setProperty(id, value);
+		return ColoredObject::setProperty(id, value);
 	}
 }
 
-QString modelobjects::Triangle::textRepresentation() const
+QString linetypes::Triangle::textRepresentation() const
 {
 	return utility::format("%1 %2 %3",
 		vertexToStringParens(points[0]),
@@ -58,24 +58,24 @@
 		vertexToStringParens(points[2]));
 }
 
-modelobjects::Quadrilateral::Quadrilateral(
+linetypes::Quadrilateral::Quadrilateral(
 	const Vertex& point_1,
 	const Vertex& point_2,
 	const Vertex& point_3,
 	const Vertex& point_4,
 	Color color_index) :
-	ColoredBaseObject{color_index},
+	ColoredObject{color_index},
 	points{point_1, point_2, point_3, point_4}
 {
 }
 
-modelobjects::Quadrilateral::Quadrilateral(const QVector<Vertex>& vertices, const Color color) :
-	ColoredBaseObject{color},
+linetypes::Quadrilateral::Quadrilateral(const QVector<Vertex>& vertices, const Color color) :
+	ColoredObject{color},
 	points{vertices[0], vertices[1], vertices[2], vertices[3]}
 {
 }
 
-QVariant modelobjects::Quadrilateral::getProperty(const Property id) const
+QVariant linetypes::Quadrilateral::getProperty(const Property id) const
 {
 	switch (id)
 	{
@@ -88,11 +88,11 @@
 	case Property::Point4:
 		return points[3];
 	default:
-		return ColoredBaseObject::getProperty(id);
+		return ColoredObject::getProperty(id);
 	}
 }
 
-auto modelobjects::Quadrilateral::setProperty(
+auto linetypes::Quadrilateral::setProperty(
 	const Property id,
 	const QVariant& value)
 	-> SetPropertyResult
@@ -112,11 +112,11 @@
 		points[3] = value.value<Vertex>();
 		return SetPropertyResult::Success;
 	default:
-		return ColoredBaseObject::setProperty(id, value);
+		return ColoredObject::setProperty(id, value);
 	}
 }
 
-QString modelobjects::Quadrilateral::textRepresentation() const
+QString linetypes::Quadrilateral::textRepresentation() const
 {
 	return utility::format("%1 %2 %3 %4",
 		vertexToStringParens(points[0]),