From 39d4dc86715d984d1fcac843ede10cb9389799a6 Mon Sep 17 00:00:00 2001
From: ouv <ouv@opencascade.com>
Date: Mon, 23 Aug 2010 11:22:03 +0000
Subject: [PATCH] 1) GLViewer_ViewPort2d::turnGrid() returns boolean value 2)
 additional check in GLViewer_Widget::resizeGL()

---
 src/GLViewer/GLViewer_ViewPort2d.cxx | 8 +++++++-
 src/GLViewer/GLViewer_ViewPort2d.h   | 2 +-
 src/GLViewer/GLViewer_Widget.cxx     | 7 +++++--
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/GLViewer/GLViewer_ViewPort2d.cxx b/src/GLViewer/GLViewer_ViewPort2d.cxx
index 855c3ccc7..3b18e54b6 100644
--- a/src/GLViewer/GLViewer_ViewPort2d.cxx
+++ b/src/GLViewer/GLViewer_ViewPort2d.cxx
@@ -470,17 +470,22 @@ void GLViewer_ViewPort2d::turnCompass( GLboolean on )
 /*!
   Creates or deletes grid
   \param on - if it is true, then to create
+  \return true if the grid has been just created
 */
-void GLViewer_ViewPort2d::turnGrid( GLboolean on )
+bool GLViewer_ViewPort2d::turnGrid( GLboolean on )
 {
+    bool aResult = false;
     if( on )
     {
         if( !myGrid )
+        {
             myGrid = new GLViewer_Grid( 2*WIDTH, 2*HEIGHT,
                                         2*WIDTH, 2*HEIGHT,
                                         GRID_XSIZE, GRID_YSIZE,
                                         myXPan, myYPan,
                                         myXScale, myYScale );
+            aResult = true;
+        }
         myGrid->setEnabled( GL_TRUE );
     }
     else
@@ -488,6 +493,7 @@ void GLViewer_ViewPort2d::turnGrid( GLboolean on )
         if( myGrid )
             myGrid->setEnabled( GL_FALSE );
     }
+    return aResult;
 }
 
 /*!
diff --git a/src/GLViewer/GLViewer_ViewPort2d.h b/src/GLViewer/GLViewer_ViewPort2d.h
index 8d9419ae1..cb5bfc7a3 100644
--- a/src/GLViewer/GLViewer_ViewPort2d.h
+++ b/src/GLViewer/GLViewer_ViewPort2d.h
@@ -73,7 +73,7 @@ public:
   ~GLViewer_ViewPort2d();
 
   //! On/off rectangular grid
-  void                   turnGrid( GLboolean on );
+  bool                   turnGrid( GLboolean on );
   //! Returns rectangular grid
   GLViewer_Grid*         getGrid() const { return myGrid; }
   //! Returns grid color
diff --git a/src/GLViewer/GLViewer_Widget.cxx b/src/GLViewer/GLViewer_Widget.cxx
index e1de5e4c3..1322ff49d 100644
--- a/src/GLViewer/GLViewer_Widget.cxx
+++ b/src/GLViewer/GLViewer_Widget.cxx
@@ -340,14 +340,17 @@ void GLViewer_Widget::paintGL()
 */
 void GLViewer_Widget::resizeGL( int w, int h )
 {
-
   if( h < 1 ) h = 1;
   if( w < 1 ) w = 1;
   glViewport( 0, 0, w, h);
 
   myViewPort->initResize( w, h );
 
-  if( myStart )
+  // check if the widget has not been resized yet
+  // (values 100 and 30 of width and height are default initial)
+  bool anIsUnitializedWidget = ( w == 100 && h == 30 );
+
+  if( myStart && !anIsUnitializedWidget )
   {
     myWidth = w;
     myHeight = h;
-- 
2.39.2