Initial plotting support.

src/rendering/visual_elements/basic_shapes/PolygonNode.cpp

@@ -0,0 +1,53 @@
+#include "PolygonNode.h"
+
+#include "Polygon.h"
+#include "SceneInfo.h"
+#include "SceneModel.h"
+
+PolygonNode::PolygonNode(const Transform& t)
+	: GeometryNode(t)
+{
+
+}
+
+PolygonNode::~PolygonNode()
+{
+
+}
+
+PolygonNode::Type PolygonNode::getType()
+{
+	return Type::Polygon;
+}
+
+void PolygonNode::setPoints(const std::vector<Point>& points)
+{
+	mPoints = points;
+	mGeometryIsDirty = true;
+}
+
+void PolygonNode::createOrUpdateGeometry(SceneInfo* sceneInfo)
+{
+    if (!mBackgroundItem)
+    {
+        if (sceneInfo->mSupportsGeometryPrimitives)
+        {
+            auto polygon = std::make_unique<ntk::Polygon>(mPoints);
+            mBackgroundItem = std::make_unique<SceneModel>(std::move(polygon));
+        }
+        else
+        {
+            //auto mesh = MeshPrimitives::buildRectangleAsTriMesh();
+            //mBackgroundItem = std::make_unique<SceneModel>(std::move(mesh));
+        }
+        mBackgroundItem->setName(mName + "_Model");
+    }
+    else
+    {
+        if (sceneInfo->mSupportsGeometryPrimitives)
+        {
+            auto polygon = std::make_unique<ntk::Polygon>(mPoints);
+            mBackgroundItem->updateGeometry(std::move(polygon));
+        }
+    }
+}