Actually, Quartz provides several simple ways to implement the
functionality you seek.
All drawing in Quartz is affected by the currently active
transformation matrix - therefore you can apply any desired rotational
transformation to this matrix and that will apply the designated
rotation to all further output, without any further effort on your
part.
An even simpler way is provided that does not require insight into
linear algebra: just use the provided API:
CGContextRotateCTM(CGContextRef context, float angle);
where context is the one you are drawing to, and angle is the amount
you want it rotated - either 90 or 270 degrees in your case - though it
should be expressed in radians.
Gerrit V
On Apr 6, 2005, at 12:10 AM, Niyaz wrote:
Can someone help me find documents / procedure for rotating
the display by 90 degrees , 180 degrees ?
I am rotating the monitor and I need the whole screen/display also to
be rotated correspondingly( say from landscape to potrait ).
Thanks in advance
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