diff -r 6e838748867b -r 20d2ed3af73d src/linetypes/object.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/linetypes/object.h	Sun Nov 03 18:13:38 2019 +0200
@@ -0,0 +1,82 @@
+#pragma once
+#include <QPointF>
+#include <QString>
+#include <QStringView>
+#include "main.h"
+#include "colors.h"
+#include "vertex.h"
+
+namespace linetypes
+{
+	enum class Property;
+	class Object;
+	class ColoredObject;
+	class Empty;
+}
+
+/**
+ * @brief Different properties that can be queried with getProperty
+ */
+enum class linetypes::Property
+{
+	Color, // Color of the object
+	Text, // Text contained in a comment
+	Point1, // First vertex in a polygon or edge line
+	Point2, // Second vertex in a polygon or edge line
+	Point3, // Third vertex in a polygon
+	Point4, // Fourth vertex in a quadrilateral
+	ControlPoint1, // First control point in a conditional edge line
+	ControlPoint2, // Second control point in a conditional edge line
+	Position, // Position of a subfile reference
+	Transformation, // Transformation matrix of a subfile reference
+	ReferenceName, // Subfile reference name
+	IsInverted, // Whether or not the object has been inverted with BFC INVERTNEXT
+	ErrorMessage // For error lines, why parsing failed
+};
+
+class linetypes::Object
+{
+public:
+	enum class SetPropertyResult
+	{
+		Success = 0,
+		PropertyNotHandled,
+		InvalidValue
+	};
+	Object();
+	Object(const Object&) = delete;
+	virtual ~Object();
+	const unsigned int id;
+	//virtual void toString(QTextStream &out) = 0;
+	virtual bool hasColor() const;
+	virtual QVariant getProperty(Property id) const;
+	virtual SetPropertyResult setProperty(Property id, const QVariant& value);
+	virtual QString textRepresentation() const = 0;
+	virtual QBrush textRepresentationForeground() const;
+	virtual QBrush textRepresentationBackground() const;
+	virtual QFont textRepresentationFont() const;
+};
+
+class linetypes::ColoredObject : public Object
+{
+public:
+	ColoredObject(const Color colorIndex = colors::main);
+	bool hasColor() const override final;
+	QVariant getProperty(Property id) const override;
+	SetPropertyResult setProperty(Property id, const QVariant& value) override;
+private:
+	Color colorIndex = colors::main;
+};
+
+/**
+ * @brief Represents an empty line.
+ */
+class linetypes::Empty : public Object
+{
+	QString textRepresentation() const override;
+};
+
+namespace linetypes
+{
+	using Id = std::decay_t<decltype(Object::id)>;
+}