sanjay@gt-cmmsr.GATECH.EDU (Sanjay Vasandani) (09/25/88)
I have a question regarding manipulation of regions.
Whenever I use the procedure CopyRgn(CurrentRegion,Region1) and then try to
alter CurrentRegion it seems to alter Region1 also on its own contrary to
what is written in Inside Macintosh Vol1. which says that after using the
CopyRgn function, the source region can be altered without affecting the
destination region.
For example if I use SetEmptyRgn(CurrentRegion) it destroys Region1 also and if
instead of destroying CurrentRegion I assign a new shape to it and then use
CopyRgn(CurrentRegion,Region2), then any subsequent action on Region1
such as Dragging Regions etc affects Region2 only probably because Region1
has also automatically got changed to Region2.
What I actually want is that a new shape should get assigned to CurrentRegion
and later it should permanently get stored in the from of Region1, Region2,
Region3 etc whenever the user interacting with my program so desires.
If anybody has any clue to what is going wrong or knows of a way to get
around this problem I would be grateful if he could send me email at the
following address:
sanjay@cmmsr.gatech.edu
Thanks in advance.
-Sanjay
--
Sanjay Vasandani
UUCP: sanjay@gt-cmmsr.UUCP
...!{akgua,allegra,hplabs,ihnp4,seismo,ulysses}!gatech!gt-cmmsr!sanjay
INTERNET: sanjay@cmmsr.gatech.eduusenet@cps3xx.UUCP (Usenet file owner) (09/26/88)
CopyRgn doesn't create a new region; both regions must have been created earlier. My quick guess is that your code looks something like: a := NewRgn(); b := a; /* set up the A region */ CopyRgn(a, b); What you really need to do is: a := NewRgn(); /* Create a new region */ b := NewRgn(); /* Another new region */ /* do stuff to A here */ CopyRgn(a, b); /* This puts a copy of A in B. */ (I tried to E-mail this but it bounced.) +----------------------------------+------------------------+ | Anton Rang (grad student) | "VMS forever!" | | Michigan State University | rang@cpswh.cps.msu.edu | +----------------------------------+------------------------+