On Jun 9, 2010, at 13:00, Matej Bukovinski wrote:
> // 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];
> }
I see a couple of minor issues with this:
1. I don't think it's necessary or desirable to save/restore the graphics state
around the drawRect: behavior, because I believe that's done for you around the
drawRect: invocation itself. You'd only need it if you had other non-clipped
drawing to do after drawing your annotations.
2. Instead of this:
[clipPath appendBezierPathWithRect:nodeRect];
I actually meant this:
[clipPath appendBezierPathWithRect: NSIntersectionRect (drawRect,
nodeRect)];
Otherwise the compound shape isn't what you want it to be. However, the two
versions are probably equivalent in this context, because everything's clipped
to drawRect anyway.
3. Since your 2.0-point strokes are drawn centered on the nodeRect path, only
the interior half of the strokes get protected by the clipping changes. The
effect may or may not be what you want, and may or may not be visible,
depending on the alpha values of the various colors involved.
One solution is to draw the strokes *inside* the nodeRect (by creating an inset
bezier path specifically for stroking, for example). Or, expand your clipping
protection to include the stroke:
[clipPath appendBezierPathWithRect: NSIntersectionRect (drawRect,
NSInsetRect (nodeRect, -1.0, -1.0))]; // 1.0 == strokeWidth / 2
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