Re: white screen windows at first
Re: white screen windows at first
- Subject: Re: white screen windows at first
- From: Bill Appleton <email@hidden>
- Date: Wed, 28 Apr 2010 11:41:05 -0700
hi all,
some more information
if i call
*cgcontext = [[myNSWindowPtr graphicsContext] graphicsPort];*
*CGContextSaveGState(cgContext);*
*draw with core graphics here...
CGContextRestoreGState(cgContext);*
cgcontextsynchronize(thecontext):
cgcontextflush(thecontext):
then this code works on non-drawRect graphics
so i think if i remember when this is called from the drawRect loop versus
other times and add this code it will (kinda) work.
is there somebody out there that knows what is really going on?
thx
bill
On Wed, Apr 28, 2010 at 11:29 AM, Bill Appleton <
email@hidden> wrote:
> hi all,
>
> i have been working on this a lot & have some new information
>
> previously i was using carbon and core graphics
>
> when i draw to the screen, sometimes it is in the update event but
> sometimes it was in response to a mouse click, or some other event
>
> this always worked:
>
> *
> QDBeginCGContext(grafptr, &cgContext);
> CGContextSaveGState(cgContext);
>
> draw with core graphics here...
>
> CGContextRestoreGState(cgContext);
> QDEndCGContext(grafptr, &cgContext);*
>
>
> but when i switched to cocoa, i started doing this:
>
>
> *cgcontext = [[myNSWindowPtr graphicsContext] graphicsPort];*
> *CGContextSaveGState(cgContext);*
>
> *draw with core graphics here...
>
> CGContextRestoreGState(cgContext);
>
>
> *this appears to only work from inside the drawRect routine, if i get here
> from some other event it doesn't work
>
> so is it "legal" to draw on an NSWindow from some other event?
>
> if not, what the heck does QDEndCGContext do that makes it work?
>
>
>
> thanks,
>
> bill
>
>
>
>
> *
>
> *
>
>
>
>
>
>
>
>
>
> On Wed, Apr 28, 2010 at 2:51 AM, vincent habchi <email@hidden>wrote:
>
>> Le 28 avr. 2010 à 10:10, Paul Sanders a écrit :
>>
>> >> this problem must be because i am using core graphics
>>
>> There is no problem using Core Graphics, especially if your NSView is
>> backed by a CALayer. I do that routinely on the small GIS I try to develop.
>>
>> Vincent
>
>
>
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