Thomas,
Thanks again - I feel we're nearly there now...
I added the following code to our JSVGCanvas derived object:
public void setMySize(Dimension sz)
{
setSize(sz);
setPreferredSize(sz);
}
I now get the SVG drawn at (I guess) its natural size in a window that is
bigger than the physical window within the JSVGScrollPane. However I get no
scroll bars until I do something to pan the SVG or resize the window.
Is there a nice method I can call that will refresh the JSVGScrollPane given
the JSVGCanvas is now bigger than the 'viewport' on the JSVGScrollPane such
that the scroll bars will be displayed?
Thanks again,
Rob
-----Original Message-----
From: Thomas DeWeese [mailto:[EMAIL PROTECTED]
Sent: 22 January 2004 13:16
To: [EMAIL PROTECTED]
Subject: Re: Displaying Java objects on top of JSVGCanvas objects
Wilkins, Rob wrote:
> Thomas,
>
> I'm now using Batik 1.5.1rc2. I've placed out JSVGCanvas derived object
into
> a JSVGScrollPane object. This appears to all work and provides a much
nicer
> interface for the user to the panning etc. (as you suggested).
>
> I have one minor problem in that I need really need to control the initial
> resolution that the SVG is displayed at (so that I can ensure that the
> overlaid objects always load from the backend server and get displayed in
> the correct place relative to the SVG).
> When I was placing the JSVGCanvas object in a JScrollPane I could do this
> through an implementation of the Scrollable interface. When I move to
> JSVGScrollPane the methods of this interface in my object are no longer
> called. As a result the SVG just gets rendered to fill the opening size of
> the JSVGCanvas window.
The JSVGCanvas calls a method 'setMySize(Dimension sz)' when a
document is loaded to request the desired size. You should be able to
override this method to do what ever you want to setup the document.
> Is there away that I can enforce the size of the JSVGCanvas window before
> the SVG is loaded (so that it is rendered to a size I control)? If I could
> do this then I think all my current problems will be resolved.
I think the above does this.
>
> Thanks,
>
> Rob
>
> -----Original Message-----
> From: Thomas DeWeese [mailto:[EMAIL PROTECTED]
> Sent: 20 January 2004 14:19
> To: [EMAIL PROTECTED]
> Subject: Re: Displaying Java objects on top of JSVGCanvas objects
>
> Hi Rob,
>
> Wilkins, Rob wrote:
>
>
>>I spent the last two days re-working our code that overlays objects on the
>>SVG. Using your suggestion of overriding setRenderingTransform() method.
>>
>>The good news is I have got almost all of the shape updates (in response
>
> to
>
>>changes in the SVG rendering transform) working. It also allowed me to
>>remove many lines of the existing code and utilise the features of the
>>JSVGCanvas component in the correct manner.
>
>
> Great!
>
>
>> I should point out that I have also dispensed with the scrolled panel
>>that I was using in favour of the panning support built in to the
>>JSVGCanvas component.
>
>
> This is fine if you like the 'built in' panning. However I
> strong suspect that the way you are doing things the JSVGScrollPane
> from the 1.5.1rc2 release will just work (all it does it set and
> listen to the rendering transform).
>
>
>>However I have hit the following problem. If I resize the window that
>
> holds
>
>>the JSVGCanvas component I do not get a call to setRenderingTransform().
>
> So
>
>>I get no chance to scale the overlaid components.
>
>
> This is handled in updateRenderingTransform, this is called when
> the canvas changes size. The reason this is 'different' is that when
> the canvas changes size the normal behavior is to 'refit' the
> SVG document's viewBox to the Canvas - thus it is not the Canvas's
> transform that changes but the SVG's 'viewing' transform that
> changes (this distinction is important to implement the SVG 'getCTM'
> method correctly).
>
> If you are working with the 1.5.1rc2 release you
> can avoid this behavior by calling 'setRecenterOnResize(false)'.
> In this case the viewing transform will never change once the
> document is loaded.
>
>
>>The strange thing is that the SVG is clearly re-rendered as the
>>GVTTreeRendererAdapter::gvtRenderingStarted()/gvtRenderingCompleted() are
>>called. Calls to getRenderingTransform() in these methods return the
>>identity transform.
>>
>>What method should I override in order to get hold of the transform that
>
> is
>
>>applied once the window has been resized thus allowing me to scale my
>>overlaid components and align them with the scaled SVG in the resized
>>window?
>
>
> The combined rendering and viewbox transform is available from
> the JSVGCanvas.getViewBoxTransform(). It is my belief that this can
> only change in the updateRenderingTransform call so overriding that
> and using the getViewBoxTransform method should let you deal with
> this issue.
>
>
>
>
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