Re: NSBezierPath problems, seems to be two bugs

• Subject: Re: NSBezierPath problems, seems to be two bugs
• From: Jochen Moeller <email@hidden>
• Date: Thu, 16 Oct 2008 01:55:00 +0200
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Hi Aki,

thanks a lot for the valuable info which was new to me.

So one issue is solved, maybe the other will follow?

Thanks again,
Jochen Moeller

On 15.10.2008, at 19:21, Aki Inoue wrote:

Jochen,

The behavioral differences you're observing is the result of NSCompositingOperation setting.

NSRectFill() uses NSCompositeCopy whereas NSBezierPath does not modify the current setting that is accessible via - [NSGraphicsContext compositingOperation].

Aki

On 2008/10/15, at 4:56, Jochen Moeller wrote:

Hello List,

in the sample code Movie_Overlay (here with Xcode 3.1.1)
<http://developer.apple.com/samplecode/Movie_Overlay/index.html>
both subviews (AnimationView and ImageView) are filled with - whiteColor in -drawRect:.

- (void)drawRect:(NSRect)rect { // original AnimationView.m
[[NSColor whiteColor] set];
NSRectFill(rect);
[self doStarAnimation];
}

This is not what I want because the movie is dimmed with increasing alpha values in the overlay. So I replaced the -whiteColor by - clearColor in both -drawRect: and used bounds instead of rect. Additionally I set the alpha value to 0.5 (instead 0.3) in MyDocument.

- (void)drawRect:(NSRect)rect { // 1st modification
[[NSColor clearColor] set];   // in AnimationView.m
NSRectFill([self bounds]);
[self doStarAnimation];
}

1st Issue:
This worked fine in ImageView but in AnimationView remained a light grey shape of the animation figure which was not erased by NSRectFill().
...

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