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From: wb1j+@andrew.cmu.edu (William M. Bumgarner)
Newsgroups: comp.sys.next
Subject: Re: displaying an image: how?
Message-ID: <gcNaoxu00aw4E4EHo3@andrew.cmu.edu>
Date: 24 Jun 91 22:07:57 GMT
References: <1991Jun23.210636.13446@sjuphil.uucp>
Organization: Carnegie Mellon, Pittsburgh, PA
Lines: 61
In-Reply-To: <1991Jun23.210636.13446@sjuphil.uucp>



Excerpts From Captions of netnews.comp.sys.next: 23-Jun-91 displaying an
image: how? D. Carpenter@sjuphil.uuc (1304) 
>- displayImage:sender
>{
>  	myImage = [ [NXImage alloc] initFromFile: "/me/anImage.tiff" ];
> 	[myImage getSize:&imageSize];
> 
>	NXSetRect (&rect, 500.0, 350.0, imageSize.width,
>					imageSize.height);
>	myWindow = [Window newContent:&rect
>				 style:NX_TITLEDSTYLE
>				 backing:NX_BUFFERED
>				 buttonMask:NX_CLOSEBUTTONMASK
>				 defer:YES];
>	[[myWindow display] makeKeyAndOrderFront:self];
>	
>	[myImage composite:NX_COPY toPoint:&(rect.origin)];
>	return self;
>}


You need to lockFocus on a view before compositing the image to the
screen/window/view....

Probably, the easiest way for you to do that would be to do this:

[[myWindow contentView] lockFocus]; // lock focus on the window's content
                                    // view
[myImage composite:NX_COPY toPoint:&(rect.origin)]; // blast the image
[[myWindow contentView] unlockFocus]; // return to last state
[myWindow flushWindow]; // flush the contents to the screen -- this is 
                        // neccessary because you have a NX_BUFFERED window


---

As a side note, to kill the flicker of teh window coming onto the screen
and then the image appearing after that, do this:

change the defer:YES to defer:NO -- this will create the window
immediately instead of waiting until it is moved to the screen. then do:

[myWindow display];
  ... the above compositing code ...
[myWindow makeKeyAndOrderFront:self];

BTW: I'm doing this from memory-- I can't remember if the display
message is actually necessary, but have a feeling it is or else the
contents of the window will come up w/o the widgets being correctly
drawn.

b.bum
OAC -- Objective Arts Consulting <<- might be the name... not sure yet.


b.bumgarner            | Disclaimer:  All opinions expressed are my own.
wb1j+@andrew.cmu.edu   | I officially don't represent anyone unless I
NeXT Campus Consultant | explicity say I am doing so. So there. <Thpppt!>
"I ride tandem with the random/Things don't run the way I planned them.."