On 31 Dec 2013, at 6:15 AM, Leonardo <mac.iphone....@gmail.com> wrote:
> In my NSView subclass, I have to draw an image within a bezierPath and apply
> an NSShadow to the result.
> So within the drawRect: method I add
>
> [bezierPath addClip];
> [mImage drawInRect:inRect fromRect:fromRect
> operation:NSCompositeSourceOver fraction:mOpacity];
>
> It works. The image gets clipped by the path.
> Now I would like to apply the NSShadow to the result, so before those lines
> above I add
>
> [bezierPath addClip];
> [mShadow set];
> [mImage drawInRect:inRect fromRect:fromRect operation:NSCompositeSourceOver
> fraction:mOpacity];
>
> I can't get the shadow drawn because the bezierPath is clipping the drawing
> area where the shadow should fall.
> How to solve this trouble?
> I have tried to use a layer, but I get weird results when I resize, rotate
> and modify other parameters of the view.
This worked for me:
====
- (void) drawRect:(NSRect)dirtyRect
{
NSBezierPath * bezierPath = [[NSBezierPath alloc] init];
[bezierPath appendBezierPathWithRoundedRect: self.clipPathRect
xRadius: 10.0 yRadius: 10.0];
[bezierPath setLineWidth: 0.0];
NSGraphicsContext * context = [NSGraphicsContext
graphicsContextWithWindow: self.window];
// Clear the view
[context saveGraphicsState]; {
[[NSColor whiteColor] set];
[NSBezierPath fillRect: dirtyRect];
} [context restoreGraphicsState];
// Stroke the (zero-width) clipping path
[context saveGraphicsState]; {
[self.shadow set];
[bezierPath stroke];
// No width means no visible boundary line,
// but the shadow is still drawn.
} [context restoreGraphicsState];
// Draw the image, clipped to the path
[context saveGraphicsState]; {
[bezierPath addClip];
[_image drawInRect: self.clipPathRect
fromRect: self.selectedSourceRect
operation: NSCompositeSourceOver
fraction: self.imageFraction];
// The image obscures the inner shadow.
// Bug: The shadow shows through to the extent imageFraction < 1.
// Can the shadow drawing be clipped to the inverse of the clipping
path?
} [context restoreGraphicsState];
}
====
— F
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