On May 5, 2010, at 8:18 AM, Gustavo Pizano wrote:
> Hello all.
>
> I have a split view and inside I have custom views, in one subview Im drawing
> lines with a NSBezierPath, and when I move the divider I see sometimes the
> lines very thin some others no, so I know this last behavior its because Im
> drawing in half a pixel.
>
> I was reading the apple docs about this topic, and I tried at the beginning
> of my drawRect method I did as in "Converting Coordinate Values" topic
> suggest to convert my starting drawing point, but that din't help. I still
> see the above behavior.
> I realize then that when I resize the window I have the same behavior, so
> what I did was in the windowDelegate windowWillResize method, I did the
> following:
>
> if((NSInteger)frameSize.width % 2 != 0){
> frameSize.width += 1.0f;
>
> }
> if((NSInteger)frameSize.height % 2 != 0){
> frameSize.height += 1.0f;
> }
>
> and when I resize the window I don't see hte problem anymore. I tried
> applying this same to the splitview delegate when resizing, but unfortunately
> this approach didn't work well, I started getting warnings in the console
> that the size of the subviews weren't correct and it was being recalculated
> at the cost of performance.
>
> So any other idea on what can I do to avoid this behavior?
First off, is frameSize from self.frame.size? If you have a view's frame that
is not integral (ie: x=3.5, or width=300.5), then the view's contents will draw
fuzzy. You don't want that. So, do some consistent truncing/ceiling. ie:
frame.origin.x = trunc(frame.origin.x), or rounding -- rounding usually isn't
what you want, since sometimes it will round up and other times it will round
down. It is better to be consistent with trunc/ceil, but it depends on what you
are doing.
The same advice goes for the rects you are using as bezier paths.
corbin
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