Yep that didi it. Thanks for proving me wrong Quincey. Here's a working solution:
// Overlay View
- (void)drawRect:(NSRect)drawRect {
[NSGraphicsContext saveGraphicsState];
// Draw all anotations, make sure _annotations is sorted front-to-back
for (Annotation *a in _annotations) {
[a draw:drawRect];
}
[NSGraphicsContext restoreGraphicsState];
}
// Annotation
- (void)draw:(NSRect)drawRect {
NSRect nodeRect = [_node boundingBox];
if (!NSIntersectsRect(nodeRect, drawRect)) {
return; // nothing to draw
}
// Fill the background
[[self annotationFillColor] set];
[NSBezierPath fillRect:nodeRect];
// Stroke the border
[[self annotationStrokeColor] set];
[NSBezierPath setDefaultLineWidth:2.0];
[NSBezierPath strokeRect:nodeRect];
// Draw the title
[[self labelAttributedString] drawAtPoint:[self
annotationLabelPositionFor:nodeRect]];
// Clip
NSBezierPath* clipPath = [NSBezierPath bezierPathWithRect:drawRect];
[clipPath appendBezierPathWithRect:nodeRect];
[clipPath setWindingRule:NSEvenOddWindingRule];
[clipPath addClip];
}
> On Jun 9, 2010, at 11:06, Matej Bukovinski wrote:
>
>> The clipping path approach doesn't really help. It turns out that you can
>> only intersect the current clipping path (initially the view's bounds) with
>> a new path and the intersected region is the region where drawing is
>> visible. This means that when you're drawing a larger rectangle over a
>> smaller one, you would need to set the clipping path to all areas NOT
>> covered by the smaller rectangle. This is basically the same problem as
>> calculating which parts of the larger rectangle to draw and just drawing
>> there.
>
> I think you can do it, but it just takes an extra step. For each overlay
> (front to back):
>
> 1. Intersect the rect for the current overlay with the "drawRect" (i.e. the
> rect passed to drawRect:) producing the effective "tintRect".
>
> 1a. If tintRect is empty, nothing to draw, so skip 2-4.
>
> 2. Fill the tint rect with the appropriate color.
>
> 3. Construct a new bezier compound-path object with one path from drawRect
> (+[NSBezierPath bezierPathWithRect:]), plus a path from the tintRect
> (-[NSBezierPath appendBezierPathWithRect:]). That essentially "inverts" the
> tintRect within drawRect. Set the even-odd winding rule on the path, so that
> you don't have to be concerned about subpath directions (although I believe
> creating a compound path in the order I described will give correct results
> with non-zero winding rule, too).
>
> 4. Intersect this compound path with the current clipping path
> (-[NSBezierPath addClip]).
>
> Repeat for each overlay rect.
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