Multiple Passes Through a Document for Displaying Simple SVG

[David Proft <da...@motive.com>]

First of all, many thanks to Thomas and Tony for their earlier advice on looking at the slideshow app.

Well, I'm on to my next (hopefully last) problem.  I have an Illustrator document that I saved as a SVG file.  The document has about 10 layers.  What I am doing is:

 1) Create the SVGDocument from the SVG file
 2) Go through all of the "layers" (<g> elements with ids attrs) and make them invisible (set attr: "i:visible" to "no" and "display" to "none").
 3) For each "layer", set it visible, build the GraphicsNode root node, create a buffered image and store that image in a hashmap.


This works fine in theory, but I am seeing that I have to either reload the SVGDocument or clone it between each rendering iteration.  If I don't, only the first "layer" is rendered and all of the other layers' images are simply the first image.

Can anyone offer any advice on why I am having to clone the SVGDocument every time?  I am guessing it is getting cached somewhere, but I can't find it after spending a good amount of time searching.

Thanks in advance for your assistance,

David

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Re: Multiple Passes Through a Document for Displaying Simple SVG

[Thomas DeWeese <Th...@Kodak.com>]

David Proft wrote:
> First of all, many thanks to Thomas and Tony for their earlier advice on looking at the slideshow app.
> 
> Well, I'm on to my next (hopefully last) problem.  I have an Illustrator document that I saved as a SVG file.  
> The document has about 10 layers.  What I am doing is:
> 
>  1) Create the SVGDocument from the SVG file
>  2) Go through all of the "layers" (<g> elements with ids attrs) and make them invisible 
>     (set attr: "i:visible" to "no" and "display" to "none").
>  3) For each "layer", set it visible, build the GraphicsNode root node, create a buffered 
> image and store that image in a hashmap.
> 
> 
> This works fine in theory, but I am seeing that I have to either reload the SVGDocument or clone 
> it between each rendering iteration.  If I don't, only the first "layer" is rendered and all of 
> the other layers' images are simply the first image.
> 
> Can anyone offer any advice on why I am having to clone the SVGDocument every time?  I am guessing 
> it is getting cached somewhere, but I can't find it after spending a good amount of time searching.

   There are two possibilities:
1) You aren't building the document to support modification of the DOM,
    by calling BridgeContext.setDynamic(true), or something similar.
2) More likely, you aren't using a really, really, really current
    version of Batik.  I only added support for modification of the
    'display' property like a week ago.
    I don't think it matters much for the above case (since you
    'iterate' through the layers) but you can accomplish something
    similar by toggling 'visibility="visible"' and 'visibility="hidden"'.

    The difference is that display removes the subtree from the rendering tree
    where as visibility simply 'skips' the subtree when rendering.

> 
> Thanks in advance for your assistance,
> 
> David
> 
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> 




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