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List:       openjdk-openjfx-dev
Subject:    Re: Level of detail
From:       Jim Graham <james.graham () oracle ! com>
Date:       2013-07-31 20:15:02
Message-ID: 51F97046.70301 () oracle ! com
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About the closest thing we have right now is the cacheHints which let you specify \
"that" you want to allow the cache to be scaled, but no ability to specify "by how \
much" before we re-render.  We've felt that mechanism needs to be eventually be \
evolved to allow more customization, but we haven't mapped out what \
controls/parameters to provide.

And, that is probably very basic compared to what you are asking for here, but a \
similar set of hints might work on an SVG node to control re-rendering...

			...jim

On 7/29/2013 1:17 PM, Scott Palmer wrote:
> The concept of Level of detail was recently brought up.  I believe it was
> referring to 3D, but the concept applies to 2D as well, when we have the
> concept of 2D scaling ("zoom")
> 
> Is there a current plan to address this?
> 
> Is there a current technique that can be used to get something close?
> 
> For example, the two use cases I have right now:
> 
> If I have a lot of Text nodes and they become unreadable when zoomed out,
> is there a way I could have them fade out and not cost me layout and
> rendering time?
> 
> If I have an image that is rendered from SVG data and used in multiple
> places in the scene graph.  I want to update it if the user changes the
> zoom level so that it isn't blocky, or replace it with the vector graphics
> used to render it if the user zooms in so much that the image size would be
> ridiculous.
> 
> 
> I can't think of a reasonably easy way to implement those cases.
> 
> I'm thinking of some new kind of Pane that is sensitive to the size that it
> will finally be rendered at.  It could be used to hide or replace it's
> children based on the final bounds it will have on screen.
> 
> 
> Scott
> 


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