diff -r 6988973515d2 -r ca23936b455b src/linetypes/quadrilateral.cpp
--- a/src/linetypes/quadrilateral.cpp	Wed May 25 20:36:34 2022 +0300
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,57 +0,0 @@
-#include "quadrilateral.h"
-
-QString ldraw::Quadrilateral::textRepresentation() const
-{
-	return utility::format("%1 %2 %3 %4",
-		utility::vertexToStringParens(this->points[0]),
-		utility::vertexToStringParens(this->points[1]),
-		utility::vertexToStringParens(this->points[2]),
-		utility::vertexToStringParens(this->points[3]));
-}
-
-void ldraw::Quadrilateral::getPolygons(
-	std::vector<gl::Polygon>& polygons,
-	GetPolygonsContext* context) const
-{
-	Q_UNUSED(context)
-	polygons.push_back(gl::quadrilateral(
-		this->points[0],
-		this->points[1],
-		this->points[2],
-		this->points[3],
-		this->colorIndex,
-		this->id));
-}
-
-void ldraw::Quadrilateral::invert(GetPolygonsContext *)
-{
-	//    0 1 2 3
-	// -> 2 1 0 3
-	std::swap(this->points[0], this->points[2]);
-}
-
-ldraw::Object::Type ldraw::Quadrilateral::typeIdentifier() const
-{
-	return Type::Quadrilateral;
-}
-
-QString ldraw::Quadrilateral::toLDrawCode() const
-{
-	return utility::format(
-		"4 %1 %2 %3 %4 %5",
-		this->colorIndex.index,
-		utility::vertexToString(this->points[0]),
-		utility::vertexToString(this->points[1]),
-		utility::vertexToString(this->points[2]),
-			utility::vertexToString(this->points[3]));
-}
-
-QString ldraw::Quadrilateral::iconName() const
-{
-	return ":/icons/linetype-quadrilateral.png";
-}
-
-QString ldraw::Quadrilateral::typeName() const
-{
-	return QObject::tr("quadrilateral");
-}