Re: Compositing NSImages
Re: Compositing NSImages
- Subject: Re: Compositing NSImages
- From: Marco Binder <email@hidden>
- Date: Sat, 28 Sep 2002 18:20:44 +0200
hi,
I dont really get exactly what you want. You want to composite them one
over the other with some degree of transparency, or you want to draw
them at different positions one below the other?
doesnt really matter what you want, the approach will be about the same:
look into NSImage documentation, especially at
- (void)drawInRect:(NSRect)dstRect fromRect:(NSRect)srcRect
operation:(NSCompositingOperation)op fraction:(float)delta
You lock focus on your target image and then call this method on each
of your source images. The first (dstRect) NSRect specifies where you
want to draw it, the second (srcrect) NSRect specifies from where in
your source Image to take the rect (so probaly the whole image, right).
NSCompositingOperation would most probably be NSCompositeCopy in both
cases. Fraction specifies the transparency (1.0 is fully opaque).
So for one over the other, you would always give the same dstRect but
use a fraction below 1.0.
For drawing them one below the other, you just have to shift dstRect
down appropriately for each image.
Note: if dstRect and srcRect arent of same dimensions, it will be
scaled automatically.
hope that helps,
marco
Am Samstag, 28.09.02 um 06:37 Uhr schrieb Jan Van Tol:
List,
I would like to be able to take several images and combine them all in
to one. I would start with several (probably four or five) NSImages,
which I would composite on to a target NSImage. The end result should
be the target image looking like all of the source images displayed in
series (moving downwards). Can someone suggest a way to do this?
Many thanks in advance,
--
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