class TGQt: public TVirtualX

 Convert ROOT Widget Id to the Qt QPaintDevice pointer

 method to provide the ROOT "cast" from (QPaintDevice*) to ROOT windows "id"

 method to restore (cast) the QPaintDevice object pointer from  ROOT windows "id"

 return the Coin/QGL viewer flag safely

 Set the Coin/QGL viewer flag safely

 The method to instantiate the QApplication if needed

 Qt announced that QThread::postEvent to become obsolete and
 we have to switch to the QAppication instead.

Default Constructor *-*-*-
*-*                    ===================

Normal Constructor*-*-*-

Default Destructor*-*-*-*-
*-*                    ==================

Qt GUI initialization-

 register QWidget for the embedded TCanvas

 unregister QWidget to the TCanvas
 return  = Root registration Id or zero if the wid was not registered

 Check whether the object has been registered

-
*-*  if window == 0 InitWindow creates his own instance of  TQtWindowsObject object
-
*-*  Create a new windows
-
 window is QWidget

*-*  Create a new pixmap object

 deprecated

 deprecated

 deprecated

Get maximum number of planes*-
*-*                    ============================
*-*  nplanes     : number of bit planes
*

 Clear current window.
   fprintf(stderr,"TGQt::ClearWindow() %p\n",fSelectedWindow);

 Delete the current pixmap.

 Delete the current window.

 Copy the pixmap wid at the position xpos, ypos in the current window.

 Create OpenGL context for win windows (for "selected" Window by default)
 printf(" TGQt::CreateOpenGLContext for wid = %x fSelected= %x, threadID= %d \n",wid,fSelectedWindow,
    GetCurrentThreadId());

 Delete OpenGL context for win windows (for "selected" Window by default)

 Draw a box.
 mode=0 hollow  (kHollow)
 mode=1 solid   (kSolid)

 Draw a cell array.
 x1,y1        : left down corner
 x2,y2        : right up corner
 nx,ny        : array size
 ic           : array

 Draw a cell array. The drawing is done with the pixel presicion
 if (X2-X1)/NX (or Y) is not a exact pixel number the position of
 the top rigth corner may be wrong.

 Fill area described by polygon.
 n         : number of points
 xy(2,n)   : list of points

 Draw a line.
 x1,y1        : begin of line
 x2,y2        : end of line

 Draw a line through all points.
 n         : number of points
 xy        : list of points

 Draw n markers with the current attributes at position x, y.
 n    : number of markers to draw
 xy   : x,y coordinates of markers

 Return character up vector.

 Query the pointer to the dev offscreen buffer if any

 Returns the global cooordinate of the window "wid"

 Return pixel value associated to specified ROOT color number.
 see: GQTGUI.cxx:QtColor() also

 Get rgb values for color "index".

 Return the size of a character string.
 iw          : text width
 ih          : text height
 mess        : message

 Move the window wid.
 wid  : Window identifier.
 x    : x new window position
 y    : y new window position

 Query pointer position.
 ix       : X coordinate of pointer
 iy       : Y coordinate of pointer

 If id is NULL - loads the specified gif file at position [x0,y0] in the
 current window. Otherwise creates pixmap from gif file

 deprecated

Request string*-*-*-*-*-*-*-
*-*                    ==============
*-*  x,y         : position where text is displayed
*-*  text        : text displayed (input), edited text (output)
-
*-*  Request string:
*-*  text is displayed and can be edited with Emacs-like keybinding
*-*  return termination code (0 for ESC, 1 for RETURN)
-
*-*  Return value:
-
*-*    0     -  input was canceled
*-*    1     -  input was Ok
-
*

 Rescale the window wid.
 wid  : Window identifier
 w    : Width
 h    : Heigth

 Resize a pixmap.
 wid : pixmap to be resized
 w,h : Width and height of the pixmap

 Resize the current window if necessary.
 No implementation is required under Qt.

 Select window to which subsequent output is directed.
 fprintf(stderr," TGQt::SelectWindow %d \n", wid);
 Don't select things twice

 Set character up vector.

 Turn off the clipping for the window wid.
 deprecated
 fQPainter->setClipping(FALSE);

 Set clipping region for the window wid.
 wid        : Window indentifier
 x,y        : origin of clipping rectangle
 w,h        : size of clipping rectangle;

 Set the cursor.

 Set the double buffer on/off on window wid.
 wid  : Window identifier.
        999 means all the opened windows.
 mode : 1 double buffer is on
        0 double buffer is off

 Set the drawing mode.
 mode : drawing mode

 Set color index for fill areas.

 Set fill area style.
 fstyle   : compound fill area interior style
    fstyle = 1000*interiorstyle + styleindex

Set color index for lines*-*-*-*-
*-*                  =========================
*-*  cindex    : color index
*

Set line style-*-*-*-*-*-*-*-*-
*-*                  ==============
*-*    Set line style:
*-*    if n < 0 use pre-defined Windows style:
*-*         0 - solid lines
*-*        -1 - solid lines
*-*        -2 - dash line
*-*        -3 - dot  line
*-*        -4 - dash-dot line
*-*        -5 - dash-dot-dot line
*-*     < -6 - solid line
-
*-*    if n > 0 use dashed lines described by DASH(N)
*-*    e.g. n=4,DASH=(6,3,1,3) gives a dashed-dotted line with dash length 6
*-*    and a gap of 7 between dashes
-

   SetLineStyleString(1," ");
   SetLineStyleString(2,"12 12");
   SetLineStyleString(3,"4 8");
   SetLineStyleString(4,"12 16 4 16");
   SetLineStyleString(5,"20 12 4 12");
   SetLineStyleString(6,"20 12 4 12 4 12 4 12");
   SetLineStyleString(7,"20 20");
   SetLineStyleString(8,"20 12 4 12 4 12");
   SetLineStyleString(9,"80 20");
   SetLineStyleString(10,"80 40 4 40");

Set line style-*-*-*-*-*-*-*-*-
*-*                  ==============
*-*    Use pre-defined Windows style:
*-*    linestyle =
*-*         0 - solid lines
*-*        -1 - solid lines
*-*        -2 - dash line
*-*        -3 - dot  line
*-*        -4 - dash-dot line
*-*        -5 - dash-dot-dot line
*-*      < -6 - solid line
-
*
 Copy/Paste from TGX11::SetLineStyle (it is called "subclassing")
 Set line style.

Set line width*-*-*-*-*-*-*-*-
*-*                  ==============
*-*  width   : line width in pixels
*

Set color index for markers*-*-*-
*-*                  ===========================
*-*  cindex : color index defined my IXSETCOL
*

Set marker size index for markers*-*-*-
*-*                  =================================
*-*  msize  : marker scale factor
*

Set marker style*-*-*-*-*-*-*-*-
*-*                  ================

 Set the color with the alpha component (supported wuth Qt 4 only)

 Add  the alpha component (supported with Qt 4 only)

 Return RGBA components for the color cindex

 Return Alpha component for the color cindex

Set text alignment*-*-*-*-*-*-*-
*-*                  ==================
*-*  txalh   : horizontal text alignment
*-*  txalv   : vertical text alignment
*

Set color index for text*-*-*-*-
*-*                  ========================
*-*  cindex    : color index defined my IXSETCOL
*

 Set text font to specified name.
 mode       : loading flag
 mode=kCheck = 0     : search if the font exist (kCheck)
 mode= kLoad = 1     : search the font and load it if it exists (kLoad)
 font       : font name

 Set text font to specified name. This function returns 0 if
 the specified font is found, 1 if not.

Set current text size*-*-
*-*                      =====================

 Update display.
 mode : (1) update
        (0) sync

 Writes the current active window into pixmap file.
 The format is defined by the file name extension
 like "png","jpg","bmp"  . . .
 If no extension is provided the "png" format is used by default

 Returns 1 in case of success,
         0 otherwise
 Note: this method may not produce the expected result been called
 ----  from the ROOT prompt by simple reason:
       The active window will be console window
       rather the last selected ROOT canvas.

 Write the pixmap wid in the bitmap file pxname in JPEG.
 wid         : Pixmap address
 w,h         : Width and height of the pixmap.
               if w = h = -1 the size of the pimxap is equal the size the wid size
 pxname      : pixmap file name
               The format is defined by the file name extension
               like "png","jpg","bmp"  . . .
               If no or some unknown extension is provided then
               the "png" format is used by default
 --
 Take in account the special ROOT filename syntax 26.12.2006 vf
               "gif+NN" - an animated GIF file is produced, where NN is delay in 10ms units

 Make sure we load the GUI DLL from the gui thread

 Force processing the Qt events only without entering the ROOT event loop