ENH: Add switch API for light

Base/Scene/imstkLight.cpp

@@ -96,15 +96,27 @@ Light::setFocalPoint(const double& x,
 }
 
 const bool
-Light::isDirectional()
+Light::isOn()
 {
-    return !this->isPositional();
+    return m_vtkLight->GetSwitch();
 }
 
 void
-Light::setDirectional()
+Light::switchOn()
 {
-    m_vtkLight->PositionalOff();
+    m_vtkLight->SwitchOn();
+}
+
+const bool
+Light::isOff()
+{
+    return !this->isOn();
+}
+
+void
+Light::switchOff()
+{
+    m_vtkLight->SwitchOff();
 }
 
 const bool
@@ -119,6 +131,18 @@ Light::setPositional()
     m_vtkLight->PositionalOn();
 }
 
+const bool
+Light::isDirectional()
+{
+    return !this->isPositional();
+}
+
+void
+Light::setDirectional()
+{
+    m_vtkLight->PositionalOff();
+}
+
 const double
 Light::getSpotAngle() const
 {

Base/Scene/imstkLight.h

@@ -50,6 +50,8 @@ public:
     const LightType getType();
     void setType(const LightType& type);
 
+
+
     const Vec3d getPosition() const;
     void setPosition(const Vec3d& p);
     void setPosition(const double& x,
@@ -62,12 +64,18 @@ public:
                      const double& y,
                      const double& z);
 
-    const bool isDirectional();
-    void setDirectional();
+    const bool isOn();
+    void switchOn();
+
+    const bool isOff();
+    void switchOff();
 
     const bool isPositional();
     void setPositional();
 
+    const bool isDirectional();
+    void setDirectional();
+
     const double getSpotAngle() const;
     void setSpotAngle(const double& angle);