ENH : initialize points and intialize rendering funnction

Code/Visualization/otbHistogramActionHandler.h

@@ -81,7 +81,8 @@ public:
 virtual bool HandleWidgetEvent(std::string widgetId, int event)
   {
     // Variable declaration
-    PointType             spacePoint, screenPoint;
+    PointType             spacePoint;
+    spacePoint.Fill(0);
     
     // Left screen abcisse
     spacePoint[0]     = m_LeftAsymptote->GetAbcisse();
@@ -137,21 +138,23 @@ virtual bool HandleWidgetEvent(std::string widgetId, int event)
                 //  Update The Rendering Function min and max
                 ParametersType param = m_RenderingFunction->GetParameters();
                 param.SetElement(2*m_Channel, m_LeftAsymptote->GetAbcisse() + tx);
-		  param.SetElement(2*m_Channel+1, m_RightAsymptote->GetAbcisse());
+		param.SetElement(2*m_Channel+1, m_RightAsymptote->GetAbcisse());
                 m_RenderingFunction->SetParameters(param);
+		m_RenderingFunction->Initialize();
               }
               
              if(m_ModifyRight)
               {
                 double tx = x - abcisseR;
-                m_RightAsymptote->SetAbcisse(m_RightAsymptote->GetAbcisse() + tx);
+		m_RightAsymptote->SetAbcisse(m_RightAsymptote->GetAbcisse() + tx);
                 m_Curve->redraw();
               
                 //  Update The Rendering Function min and max
                 ParametersType param = m_RenderingFunction->GetParameters();
                 param.SetElement(2*m_Channel, m_LeftAsymptote->GetAbcisse());
-		  param.SetElement(2*m_Channel+1, m_RightAsymptote->GetAbcisse()+tx);
+		param.SetElement(2*m_Channel+1, m_RightAsymptote->GetAbcisse()+tx);
                 m_RenderingFunction->SetParameters(param);
+		m_RenderingFunction->Initialize();
               }
              return true;
            }