Re: CALayer resizing puzzle
Re: CALayer resizing puzzle
- Subject: Re: CALayer resizing puzzle
- From: Scott Anguish <email@hidden>
- Date: Fri, 22 Jan 2010 01:32:56 -0500
this specific example of course assumes that you’re using the iphone. But, the technique should be sound for what you’re trying to do.
The technique is applicable to use a pool of multiple views to contain smaller amounts of the content. the advantage is that you can render or fetch the content that is visible (or could be next) only when required. As you show new content relocate the views, create the layers (which you could do in the reusable pool) and the set the content. Then move the no longer visible layers back to the pool, clearing the content to save space.
On Jan 21, 2010, at 10:38 PM, Scott Anguish wrote:
> look at the ScrollViewSuite example.. specifically the tiling one. techniques illustrated.
>
>
> On Jan 21, 2010, at 12:39 PM, vincent habchi wrote:
>
>> Hi to all,
>>
>> I'm trying to write a (at that time) simple GIS-like application based on Cocoa. For each cartographic layer, I use a CALayer object, which is nice to control things like opacity in real-time.
>>
>> However, I'm facing a challenge: when the user move the mouse, the drawing must move accordingly, feeling in white spaces that appear when updating the position property. However, to feel in those spaces, the app must be able to draw on it, thus the layer shall be resizable in every four direction, including left and below, while maintaining the existing drawing unchanged. I've tried to move the anchor point around and modify bounds or frame, but to no avail: or I get no extension, or I have a transitory motion corresponding to a bound property change (is there a way to disable the implied CASimpleAnimation?). So, put briefly, is there a way to extend a CALayer in whatever direction while keeping its content unmoving?
>>
>> Thanks!
>> Vincent_______________________________________________
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