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Re: Darken image

assuming the method signature that you left out was:

- (void)drawRect:(NSRect)theRect

you are using theRect (which has nothing to do with the size of
anything, since it's merely the rectangle that has been exposed via the
union of a bunch of calls to needsDisplayInRect) as the fromRect
parameter in your call to drawInRect... this would cause random results..

use NSZeroRect there to indicate you want the whole source image.

[icon drawInRect: imageRect fromRect: NSZeroRect
operation: NSCompositeSourceOver fraction: 1.0];

I've hacked on a more complete version of the sample I sent you last
time, I'll send it along in the next email...

-Tom

On Thursday, July 19, 2001, at 05:09 PM, Andreas Monitzer wrote:

> Yes, your example works fine. However, when I try to insert it into my
> code, it goes crazy.
>
> Here's what I converted it to:
>
> // theRect = the NSRect I got via drawRect
> // imageRect = the NSRect I should draw into (part of theRect)
> if (selected) {
> NSSize iconSize = [icon size];
> NSRect iconRect = {NSZeroPoint, iconSize};
> NSImage *im = [[icon copyWithZone:[self zone]] autorelease];
>
> [im lockFocus];
> [im unlockFocus];
> icon = im;
> }
>
> [icon drawInRect: imageRect fromRect: theRect
> operation: NSCompositeSourceOver fraction: 1.0];
>
> When selected==NO, everything is fine. But when it's YES, the icon is
> scaled up, scaled down, changes DPI or does something else (depends on
> the icon). When I remove lockFocus and unlockFocus, it's fine again,
> but I can'
> t draw into it!
>
> When using this code...
>
> if (selected) {
> NSSize iconSize = [icon size];
> NSRect iconRect = {NSZeroPoint, iconSize};
> NSImage *im = [[[NSImage alloc] initWithSize: iconSize]
> autorelease];
>
> [im lockFocus];
> // copy the icon into the new one
> [icon drawInRect: iconRect fromRect: theRect /*** BAD ***/
> operation: NSCompositeCopy fraction: 1.0];
>
> [im unlockFocus];
> icon = im;
> }
>
> [icon drawInRect: imageRect fromRect: theRect /**** BAD ***/
> operation: NSCompositeSourceOver fraction: 1.0];
>
> ...all icons are scaled down (non-proportional).
>
>
> What the hell is going on here?

References: 
 >Re: Darken image (From: Andreas Monitzer <email@hidden>)



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