| [Overview][Constants][Types][Procedures and functions][Variables] | Reference for unit 'video' (#rtl) |
Update physical screen with internal screen image.
Source position: videoh.inc line 134
procedure UpdateScreen( |
Force: Boolean |
); |
UpdateScreen synchronizes the actual screen with the contents of the VideoBuf internal buffer. The parameter Force specifies whether the whole screen has to be redrawn (Force=True) or only parts that have changed since the last update of the screen.
The Video unit keeps an internal copy of the screen as it last wrote it to the screen (in the OldVideoBuf array). The current contents of VideoBuf are examined to see what locations on the screen need to be updated. On slow terminals (e.g. a linux telnet session) this mechanism can speed up the screen redraw considerably.
For an example, see most other functions.
None.
|
Clear the video screen. |
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