ENH : change circle center representation solution

Code/Visualization/otbCircleGlComponent.cxx

@@ -36,6 +36,8 @@ CircleGlComponent
   m_Radius = 10;
   // Create the tesselator
   m_GluTesselator = gluNewTess(); 
+  // Center representation
+  m_CenterRepresentation = CROSS;
 }
 
 CircleGlComponent
@@ -113,7 +115,7 @@ CircleGlComponent
 
   // Draw the center
   //glColor4d(m_ColorList[id][0],m_ColorList[id][1],m_ColorList[id][2],1)
-  if(m_Radius>4)
+  if( m_CenterRepresentation == CIRCLE && m_Radius>4 )
     {
       glColor4d(0, 0, 0, 1);
       glEnable(GL_BLEND);
@@ -122,6 +124,17 @@ CircleGlComponent
       glVertex2d(screenPoint[0],screenPoint[1]);
       glEnd();
     }
+  else if( m_CenterRepresentation == CROSS )
+    {
+      glColor4d(0, 0, 0, 1);
+      glBegin(GL_LINES);
+      // Draw a cross
+      glVertex2d(screenPoint[0]-m_Radius,screenPoint[1]);
+      glVertex2d(screenPoint[0]+m_Radius,screenPoint[1]);
+      glVertex2d(screenPoint[0],screenPoint[1]-m_Radius);
+      glVertex2d(screenPoint[0],screenPoint[1]+m_Radius);
+      glEnd();
+    }
 }
 
 }

Code/Visualization/otbCircleGlComponent.h

@@ -69,6 +69,8 @@ public:
   typedef std::vector<IndexType> IndexListType;
   typedef std::vector<ColorType> ColorListType;
 
+  typedef enum { CIRCLE, CROSS } CenterRepresentationEnumType;
+
   /** Runtime information */
   itkTypeMacro(CircleGlComponent,GlComponent);
 
@@ -132,6 +134,10 @@ public:
   itkSetMacro(Radius,double);
   itkGetMacro(Radius,double);
 
+  /** Set/Get the center circle radius. */
+  itkSetMacro(CenterRepresentation,CenterRepresentationEnumType);
+  itkGetMacro(CenterRepresentation,CenterRepresentationEnumType);
+
 protected:
   /** Constructor */
   CircleGlComponent();
@@ -175,6 +181,9 @@ private:
   /** Default color : red*/
   ColorType m_RedColor;
 
+  /** Center representation */ 
+  CenterRepresentationEnumType m_CenterRepresentation;
+
 }; // end class
 } // end namespace otb