3d charts: Zoom the camera towards a bar.

Change-Id: I3fa644924ca176dfd853b527e0c42dadaf9fa091

chart2/source/view/inc/3DChartObjects.hxx

@@ -89,6 +89,10 @@ class Camera : public Renderable3DObject
 public:
     Camera(OpenGL3DRenderer* pRenderer);
     virtual void render() SAL_OVERRIDE;
+
+    /// Zooms the camera towards the bar with Unique Id nId.
+    void zoom(sal_uInt32 nId);
+
 private:
     glm::vec3 maPos;
     glm::vec3 maUp;

chart2/source/view/main/3DChartObjects.cxx

@@ -111,6 +111,10 @@ void Camera::render()
     mpRenderer->SetCameraInfo(maPos, maDirection, maUp, true);
 }
 
+void Camera::zoom(sal_uInt32 /*nId*/)
+{
+    // TODO here
+}
 
 namespace temporary {