Simple drawing example.

src/visual_elements/basic_shapes/CircleNode.cpp

@@ -0,0 +1,83 @@
+#include "CircleNode.h"
+
+#include "FontsManager.h"
+#include "SceneModel.h"
+#include "AbstractMesh.h"
+#include "MeshPrimitives.h"
+
+#include <iostream>
+
+CircleNode::CircleNode(const DiscretePoint& location, unsigned radius)
+:    GeometryNode(location),
+     mRadius(radius)
+{
+
+}
+
+CircleNode::Type CircleNode::getType()
+{
+    return Type::Circle;
+}
+
+unsigned CircleNode::getRadius() const
+{
+    return mRadius;
+}
+
+SceneItem* CircleNode::getSceneItem(std::size_t idx) const
+{
+    if (idx == 0)
+    {
+        return mBackgroundItem.get();
+    }
+    else
+    {
+        return nullptr;
+    }
+}
+
+unsigned CircleNode::getNumSceneItems() const
+{
+    return 1;
+}
+
+void CircleNode::setRadius(unsigned radius)
+{
+    if (mRadius != radius)
+    {
+        mRadius = radius;
+        mTransformIsDirty = true;
+    }
+
+}
+
+void CircleNode::update(FontsManager* fontsManager)
+{
+    if (!mBackgroundItem || mGeometryIsDirty)
+    {
+        auto mesh = MeshPrimitives::buildCircleAsTriMesh();
+
+        if (!mBackgroundItem)
+        {
+            mBackgroundItem = std::make_unique<SceneModel>(std::move(mesh));
+            mBackgroundItem->setName(mName + "_Model");
+        }
+        else
+        {
+            mBackgroundItem->updateMesh(std::move(mesh));
+        }
+        mGeometryIsDirty = false;
+    }
+
+    if (mTransformIsDirty)
+    {
+        mBackgroundItem->updateTransform({mLocation, static_cast<double>(2*mRadius), static_cast<double>(2*mRadius)});
+        mTransformIsDirty = false;
+    }
+
+    if (mMaterialIsDirty)
+    {
+        mBackgroundItem->updateUniformColor(mFillColor);
+        mMaterialIsDirty = false;
+    }
+}