diff -r 20d2ed3af73d -r 9e18ec63eec3 src/linetypes/polygon.cpp
--- a/src/linetypes/polygon.cpp	Sun Nov 03 18:13:38 2019 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,126 +0,0 @@
-#include "polygon.h"
-
-linetypes::Triangle::Triangle(
-	const Vertex& point_1,
-	const Vertex& point_2,
-	const Vertex& point_3,
-	Color color_index) :
-	ColoredObject{color_index},
-	points{point_1, point_2, point_3}
-{
-}
-
-linetypes::Triangle::Triangle(const QVector<Vertex>& vertices, const Color color) :
-	ColoredObject{color},
-	points{vertices[0], vertices[1], vertices[2]}
-{
-}
-
-QVariant linetypes::Triangle::getProperty(const Property id) const
-{
-	switch (id)
-	{
-	case Property::Point1:
-		return points[0];
-	case Property::Point2:
-		return points[1];
-	case Property::Point3:
-		return points[2];
-	default:
-		return ColoredObject::getProperty(id);
-	}
-}
-
-auto linetypes::Triangle::setProperty(Property id, const QVariant& value)
-	-> SetPropertyResult
-{
-	switch (id)
-	{
-	case Property::Point1:
-		points[0] = value.value<Vertex>();
-		return SetPropertyResult::Success;
-	case Property::Point2:
-		points[1] = value.value<Vertex>();
-		return SetPropertyResult::Success;
-	case Property::Point3:
-		points[2] = value.value<Vertex>();
-		return SetPropertyResult::Success;
-	default:
-		return ColoredObject::setProperty(id, value);
-	}
-}
-
-QString linetypes::Triangle::textRepresentation() const
-{
-	return utility::format("%1 %2 %3",
-		vertexToStringParens(points[0]),
-		vertexToStringParens(points[1]),
-		vertexToStringParens(points[2]));
-}
-
-linetypes::Quadrilateral::Quadrilateral(
-	const Vertex& point_1,
-	const Vertex& point_2,
-	const Vertex& point_3,
-	const Vertex& point_4,
-	Color color_index) :
-	ColoredObject{color_index},
-	points{point_1, point_2, point_3, point_4}
-{
-}
-
-linetypes::Quadrilateral::Quadrilateral(const QVector<Vertex>& vertices, const Color color) :
-	ColoredObject{color},
-	points{vertices[0], vertices[1], vertices[2], vertices[3]}
-{
-}
-
-QVariant linetypes::Quadrilateral::getProperty(const Property id) const
-{
-	switch (id)
-	{
-	case Property::Point1:
-		return points[0];
-	case Property::Point2:
-		return points[1];
-	case Property::Point3:
-		return points[2];
-	case Property::Point4:
-		return points[3];
-	default:
-		return ColoredObject::getProperty(id);
-	}
-}
-
-auto linetypes::Quadrilateral::setProperty(
-	const Property id,
-	const QVariant& value)
-	-> SetPropertyResult
-{
-	switch (id)
-	{
-	case Property::Point1:
-		points[0] = value.value<Vertex>();
-		return SetPropertyResult::Success;
-	case Property::Point2:
-		points[1] = value.value<Vertex>();
-		return SetPropertyResult::Success;
-	case Property::Point3:
-		points[2] = value.value<Vertex>();
-		return SetPropertyResult::Success;
-	case Property::Point4:
-		points[3] = value.value<Vertex>();
-		return SetPropertyResult::Success;
-	default:
-		return ColoredObject::setProperty(id, value);
-	}
-}
-
-QString linetypes::Quadrilateral::textRepresentation() const
-{
-	return utility::format("%1 %2 %3 %4",
-		vertexToStringParens(points[0]),
-		vertexToStringParens(points[1]),
-		vertexToStringParens(points[2]),
-		vertexToStringParens(points[3]));
-}