Re: NSImage and flipping
Re: NSImage and flipping
- Subject: Re: NSImage and flipping
- From: "Louis C. Sacha" <email@hidden>
- Date: Sun, 15 Feb 2004 00:40:22 -0800
Hello...
I didn't realize that you were trying to draw the text in the actual
NSImage, not copying it from a view where you were drawing.
The effects you are talking about are what I meant when I said that
the source for the NSImage is always unflipped, and that the NSImage
method setFlipped: only affects the way the image is drawn/displayed
in the destination. When you draw into an NSImage, the coordinate
system is always the standard unflipped coordinate system, and it
can't be changed easily the way the coordinate system of a view can
(theoretically it could be done, but NSCachedImageRep --which is in
charge of the actual image data when you draw into an NSImage-- is
not designed to work that way).
If the text is already being drawn in the view you are dragging from,
it would probably be easier to create the image using the NSView
instance method dataWithPDFInsideRect: or dataWithEPSInsideRect: and
then creating an NSImage from the resulting data using the NSImage
initializer initWithData:.
If that solution won't work for you, and no one else has posted a
better way, post again and I will try to put together some code that
will allow you to draw into an NSImage the way you want...
Louis
2004-02-14 kl. 21.02 skrev Louis C. Sacha:
Hello...
For an NSImage, the "flipped" state refers to the destination view
where the image will be composited, not the source view. So, all
you probably have to do is not call setFlipped:YES...
Well that's just what I thaught. Unfortunately it doesn't work. In
an ordinary NSView toggeling the flipped state affects the order of
multiline text rendering. If its not flipped the text comes out like
this:
out like this
the text comes
Setting it to flipped makes Cocoas text rendering put the lines in
the correct order. When using the same code to draw text in an
NSImage that is not flipped. The text comes out the same way. That
is:
out like this
the text comes
This is clearly not what I want. But if I set the the flipped state
to true in an NSImage I don't get the same result as in an NSView.
Instead the finished graphic (the pixels) comes out upside down.
This is not what I want either.
Thank you anyway. If you have any ideas please let me know.
Bjvrn
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