diff -r 68443f5be176 -r 44679e468ba9 src/objecttypes/polygon.cpp
--- a/src/objecttypes/polygon.cpp	Sat Oct 05 23:47:03 2019 +0300
+++ b/src/objecttypes/polygon.cpp	Sun Nov 03 12:17:41 2019 +0200
@@ -10,6 +10,12 @@
 {
 }
 
+modelobjects::Triangle::Triangle(const QVector<Vertex>& vertices, const Color color) :
+	ColoredBaseObject{color},
+	points{vertices[0], vertices[1], vertices[2]}
+{
+}
+
 QVariant modelobjects::Triangle::getProperty(const Property id) const
 {
 	switch (id)
@@ -46,7 +52,7 @@
 
 QString modelobjects::Triangle::textRepresentation() const
 {
-	return format("%1 %2 %3",
+	return utility::format("%1 %2 %3",
 		vertexToStringParens(points[0]),
 		vertexToStringParens(points[1]),
 		vertexToStringParens(points[2]));
@@ -63,6 +69,12 @@
 {
 }
 
+modelobjects::Quadrilateral::Quadrilateral(const QVector<Vertex>& vertices, const Color color) :
+	ColoredBaseObject{color},
+	points{vertices[0], vertices[1], vertices[2], vertices[3]}
+{
+}
+
 QVariant modelobjects::Quadrilateral::getProperty(const Property id) const
 {
 	switch (id)
@@ -106,7 +118,7 @@
 
 QString modelobjects::Quadrilateral::textRepresentation() const
 {
-	return format("%1 %2 %3 %4",
+	return utility::format("%1 %2 %3 %4",
 		vertexToStringParens(points[0]),
 		vertexToStringParens(points[1]),
 		vertexToStringParens(points[2]),