On 06/05/2009, at 4:47 AM, McLaughlin, Michael P. wrote:
In a custom NSBezierView, I fill the view with a background color
then set a
clip path that will eventually be drawn as a map. I do this so that
I can
color-code the map (in a complicated way) without "going outside the
lines".
If I then draw the map, external boundaries are drawn as half-width
lines
because the clip path divides them in half lengthwise.
I cannot just double the line width because there are internal map
boundaries as well so I would like to *remove* the clip path totally.
If I write
[[NSBezierPath new] setClip];
this works perfectly except that I get an error in the Console
window which
I would rather avoid.
Is there a recommended way to remove a clip path?
Note: Setting the clip path to a dummy path outside the view does
not work
because then the map will not be drawn at all.
Thanks for any tips.
The clip path is part of the graphics state of the context, so to
remove a clip path you set you have to save the state prior to setting
the clip, then restore it afterwards:
[NSGraphicsContext saveGraphicsState];
[myPath addClip];
// draw stuff
[NSGraphicsContext restoreGraphicsState]; // undoes the -addClip
Note that also, in general when drawing in a view, you should use -
addClip rather than -setClip, because the view has already set a
clipping path to constrain drawing within its visible frame. Using -
addClip takes this into account, -setClip doesn't which would mean you
could draw right over the edge of the view.
--Graham
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