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Conference bulova::decw_jan-89_to_nov-90

Title:DECWINDOWS 26-JAN-89 to 29-NOV-90
Notice:See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit
Moderator:STAR::VATNE
Created:Mon Oct 30 1989
Last Modified:Mon Dec 31 1990
Last Successful Update:Fri Jun 06 1997
Number of topics:3726
Total number of notes:19516

2656.0. "Object and background ?" by PRSUD1::VEZINA (If ya can't fix it, don't break it!!) Wed Apr 25 1990 12:52

    Hello to all Windowers,
    
        I'm currently plodding along through tons of documentation
    	to get to know DECwindows...
    
    	In the meantime, I must answer a customer's question ASAP,
    	i.e. is it possible to define a background graphic image
    	(like a map) and to move an object over it (like a plane)
    	without having to worry about redrawing the background ?
    
    	With the appropriate hardware, this would be achieved by
    	merging (ORing) two bitmaps... Is this in the realm of
    	DECwindows possibilities ?
    
    					Thanks in advance,
    						Mike
T.RTitleUserPersonal
Name		DateLines
2656.1DECWIN::JMSYNGEJames M Synge, VMS DevelopmentWed Apr 25 1990 14:198
    Yes, this is possible.  Your customer can either do as you suggest
    (allocate seperate planes for your background and foreground) if the
    hardware supports it, or your customer can draw the background into a
    Pixmap, and tell the server that this Pixmap is the background for the
    window.  When your object moves, you can clear the area, and the server
    will copy from the appropriate area of the pixmap into the window.
    
    James