Added a method to show the head on arrows and axis

Changelog.md

@@ -6,6 +6,9 @@
 
 ### Ignition Rendering 4.0.0
 
+1. Added a method to show the head on arrows and axis
+    * [Pull request #95](https://github.com/ignitionrobotics/ign-rendering/pull/95)
+
 1. Scale BaseAxis properly
     * [Pull request #88](https://github.com/ignitionrobotics/ign-rendering/pull/88)
 

include/ignition/rendering/ArrowVisual.hh

@@ -41,6 +41,10 @@ namespace ignition
       /// \brief Get arrow-shaft visual
       /// \return The arrow-shaft visual
       public: virtual VisualPtr Shaft() const = 0;
+
+      /// \brief set true to show the arrow head, false otherwise
+      /// \param[in] _b true to show the arrow head, false otherwise
+      public: virtual void ShowArrowHead(bool _b) = 0;
     };
     }
   }

include/ignition/rendering/AxisVisual.hh

@@ -33,6 +33,10 @@ namespace ignition
     {
       /// \brief Deconstructor
       public: virtual ~AxisVisual() { }
+
+      /// \brief set true to show the axis heads, false otherwise
+      /// \param[in] _b true to show the axis heads, false otherwise
+      public: virtual void ShowAxisHead(bool _b) = 0;
     };
     }
   }

include/ignition/rendering/base/BaseArrowVisual.hh

@@ -39,6 +39,9 @@ namespace ignition
 
       public: virtual VisualPtr Shaft() const;
 
+      // Documentation inherited
+      public: virtual void ShowArrowHead(bool _b) override;
+
       protected: virtual void Init();
     };
 
@@ -68,6 +71,18 @@ namespace ignition
       return nullptr;
     }
 
+    //////////////////////////////////////////////////
+    template <class T>
+    void BaseArrowVisual<T>::ShowArrowHead(bool _b)
+    {
+      NodePtr child = this->ChildByIndex(1);
+      VisualPtr visual = std::dynamic_pointer_cast<Visual>(child);
+      if (visual)
+      {
+        visual->SetVisible(_b);
+      }
+    }
+
     //////////////////////////////////////////////////
     template <class T>
     void BaseArrowVisual<T>::Init()

include/ignition/rendering/base/BaseAxisVisual.hh

@@ -44,6 +44,9 @@ namespace ignition
 
       // Documentation inherited.
       public: virtual math::Vector3d LocalScale() const override;
+
+      // Documentation inherited.
+      public: void ShowAxisHead(bool _b) override;
     };
 
     //////////////////////////////////////////////////
@@ -78,6 +81,18 @@ namespace ignition
                                              _scale.Z());
     }
 
+    //////////////////////////////////////////////////
+    template <class T>
+    void BaseAxisVisual<T>::ShowAxisHead(bool _b)
+    {
+      for (unsigned int i = 0; i < this->ChildCount(); ++i)
+      {
+        auto arrow = std::dynamic_pointer_cast<rendering::ArrowVisual>(
+              this->ChildByIndex(i));
+        arrow->ShowArrowHead(_b);
+      }
+    }
+
     //////////////////////////////////////////////////
     template <class T>
     void BaseAxisVisual<T>::Init()