dev_clear_window — Clear the contents of the active graphics window.
dev_clear_window( : : : )
dev_clear_window clears the contents of the active graphics window
including the history of the displayed iconic objects.
The output parameters that have been set for this window
via the context menu, the visualization parameters dialog, or the
appropriate operators (e.g., with
dev_set_draw, etc.) remain unmodified.
The operator is equivalent to pressing the
Clear button of the active graphics window.
A graphics window can be activated by calling
dev_set_window or by
Activate button in the tool bar of the selected
Using the code export feature of HDevelop, the code that is generated
for this operator may have a different behavior than the related
For a detailed description of the code export of HDevelop graphics
operators into the different programming languages see in the
“HDevelop User's Guide” the chapter
General Aspects of Code Generation
read_image (Image, 'fabrik') regiongrowing (Image, Regions, 3, 3, 6, 100) Number := |Regions| dev_update_window ('off') for i := 1 to Number by 1 select_obj (Regions, RegionSelected, i) dev_clear_window () dev_display (RegionSelected) * stop () endfor
dev_clear_window returns always 2 (H_MSG_TRUE).