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

src/visual_elements/nodes/GridNode.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "MaterialNode.h"
+#include "Color.h"
+
+class GridNode : public MaterialNode
+{
+
+public:
+    GridNode(const Point& location);
+
+    void setNumX(unsigned numX);
+
+    void setNumY(unsigned numY);
+
+    void setData(const std::vector<Color>& colors);
+
+    SceneItem* getSceneItem(std::size_t idx) const override;
+    std::size_t getNumSceneItems() const override;
+
+    void update(SceneInfo* sceneInfo) override;
+
+    void setWidth(double width);
+    void setHeight(double height);
+
+private:
+    unsigned mNumberX{5};
+    unsigned mNumberY{5};
+    double mWidth{1};
+    double mHeight{1};
+    bool mDataDirty = true;
+    std::vector<Color> mData;
+
+    std::unique_ptr<SceneModel> mBackgroundModel;
+    std::unique_ptr<SceneModel> mOutlineModel;
+};