Clean up of scene nodes to support 2d and non int positioning.

src/visual_elements/nodes/GeometryNode.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "MaterialNode.h"
+
+class GeometryNode : public MaterialNode
+{
+public:
+    enum class Type
+    {
+        Path,
+        Rectangle,
+        Circle,
+        Arc,
+        Line,
+        Polyline
+    };
+
+public:
+    GeometryNode(const Point& location);
+    virtual ~GeometryNode() = default;
+
+    virtual Type getType() = 0;
+
+    unsigned getStrokeThickness() const;
+    void setStrokeThickness(unsigned thickness);
+
+protected:
+    unsigned mStrokeThickness{0};
+    Type mType;
+
+    bool mGeometryIsDirty{true};
+};
+
+class LineNode : public GeometryNode
+{
+public:
+    LineNode(const Point& location)
+    :    GeometryNode(location)
+    {
+
+    }
+
+    Type getType()
+    {
+        return Type::Line;
+    }
+};
+
+using GeometryNodePtr = std::unique_ptr<GeometryNode>;