Re: UI to allow user to scale and crop image within a circle
Re: UI to allow user to scale and crop image within a circle
- Subject: Re: UI to allow user to scale and crop image within a circle
- From: David Duncan <email@hidden>
- Date: Wed, 24 Feb 2016 15:51:13 -0800
> On Feb 24, 2016, at 3:47 PM, Quincey Morris <email@hidden> wrote:
>
> On Feb 24, 2016, at 13:44 , Graham Cox <email@hidden <mailto:email@hidden>> wrote:
>>
>> However, if you use a clipping path, you can just create this on the fly as part of -drawRect: and so it’ll always be correct
>
> I don’t recall Charles’s drawing code exactly, but I think this is just part of the solution. It’ll always be correct for the part of the view being drawn, but there’s no guarantee that the whole view will be redrawn if the relationship between the bounds origin and the circle changes. I think Charles still needs something to force redrawing of the whole view when the view geometry changes.
By default -setNeedsDisplay will dirty the entire view for redraw. -setNeedsDisplayInRect: can be used for partial updates, but typically you will call that directly. If you always draw inside of the whole bounds of the view however, you are generally insulated from origin changes (as either setNeedsDisplay method should do the right thing in these circumstances).
>
> Of course, if the view geometry never changes, or the relationship of the circle to the bounds origin never changes, then I think the forced redrawing isn’t necessary.
>
--
David Duncan
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