Re: CurrentTranslate attribute

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

Andres Toussaint wrote:
> HI, i was wondering if there is an equivalent to the emacscript commands 
> detailed following, within Batik Java:
> 
> var trans = document.documentElement.currentTranslate;
> var scale = document.documentElement.currentScale;
> 
> I cannot seem to find them. I am programming drag routines for SVG 
> elements, and want to make them relative to the actual zoom and pan 
> state. I have made this using emacscript but i want this inside the Java 
> application instead of the SVG file.

    Yes, there are equiv of the above from the Java Binding:

    SVGDocument doc = ....;
    SVGSVGElement root = doc.getRootElement();
    float scale = root.getCurrentScale();
    SVGPoint trans = root.getCurrentTranslate();

    However what you probably want to use is:

    SVGLocatable elem = ...;
    SVGPoint pt = ...
    SVGMatrix mat = elem.getScreenCTM();  // elem -> screen
    mat = mat.inverse();                  // screen -> elem
    pt = pt.matrixTransform(pt);         // from screen coords->elem

    This should also be available in ECMA script (and is with Batik,
but isn't with ASV 3.0 - don't know about 6.0 - I suspect it has it).

    This will deal with any intervening transforms (viewbox, transform, etc).
Elem can be just about any 'graphical' element (rect, g, svg, ...).



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Re: CurrentTranslate attribute

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

Andres Toussaint wrote:
> What is this SVGPoint referencing:
>   SVGPoint pt = ...
> Is it the click spot?

    It's what ever you want, in this case probably the clientX/Y.
This is a general technique so it can be applied to any point in
the screen coordinate system.

> 
> Thanks.
> 
>>
>>    SVGLocatable elem = ...;
>>    SVGPoint pt = ...
>>    SVGMatrix mat = elem.getScreenCTM();  // elem -> screen
>>    mat = mat.inverse();                  // screen -> elem
>>    pt = pt.matrixTransform(pt);         // from screen coords->elem
>>
> 
> 
> 
> 
> 
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> 




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Re: CurrentTranslate attribute

[Andres Toussaint <an...@onemileup.com>]

What is this SVGPoint referencing:
   SVGPoint pt = ...
Is it the click spot?

Thanks.

>
>    SVGLocatable elem = ...;
>    SVGPoint pt = ...
>    SVGMatrix mat = elem.getScreenCTM();  // elem -> screen
>    mat = mat.inverse();                  // screen -> elem
>    pt = pt.matrixTransform(pt);         // from screen coords->elem
>





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Re: CurrentTranslate attribute

[Andres Toussaint <an...@onemileup.com>]

Thomas, thanks again, you have been very kind. I had not considered 
SVGLocatable and SVGMatrix since they lack proper description it was not 
clear what their function was.

I have succesfully accomplished the drag with getCurrentScale(), and 
will try with the SVGMatrix, since it does seem like a cleaner solution, 
and I hope it gives a smother drag effect.

Andres.




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