--- /dev/null
+.. _gl_2d_viewer_page:
+
+************
+GL 2D Viewer
+************
+
+Operations
+##########
+
+The functionalities of GL viewer are available via its Viewer
+Toolbar. Buttons marked with small downward triangles have extended
+functionality which can be accessed by locking on them with left mouse
+button.
+
+.. image:: ../images/glviewer_toolbar.png
+ :align: center
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_dump.png
+ :align: center
+
+**Dump View** - exports an object from the viewer in bmp, png or jpeg image format.
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_fitall.png
+ :align: center
+
+**Fit all** - scales the presentation so that it could fit within the Viewer boundaries.
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_fitarea.png
+ :align: center
+
+**Fit area** - resizes the view to place in the visible area only the contents of a frame drawn
+with pressed left mouse button.
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_fitselect.png
+ :align: center
+
+**Fit selection** - resizes the view to fit in the visible area only currently selected objects.
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_zoom.png
+ :align: center
+
+**Zoom** - allows to zoom in and out.
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_pan.png
+ :align: center
+
+**Panning** - if the represented objects are greater that the
+visible area and you don't wish to use **Fit all** functionality,
+click on this button and you'll be able to drag the scene to see its
+remote parts.
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_glpan.png
+ :align: center
+
+**Global panning** - allows to select a point to be the center of
+the presentation showing all displayed objects in the visible ares.
+
+____
+
+.. image:: ../../../../src/GLViewer/resources/gl_view_reset.png
+ :align: center
+
+**Reset** - restores the default position the scene.
+
+____
+
+
+.. _gl_background:
+
+Background
+##########
+
+GL Viewer background can be customized using the "Change background"
+popup menu command that opens standard "Select Color" dialog box:
+
+.. image:: ../images/selectcolor.png
+ :align: center
+
+
