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From Thomas DeWeese <thomas.dewe...@gmail.com>
Subject Re: SVGGraphics2D omits certain java Arc2D input
Date Fri, 29 Jun 2012 10:48:28 GMT
Hi Rolf,
   What you describe sounds like a plausible chain of events.

   A small standalone example would be a good first step.
   Filing a bug with the example would be a great second step.
   Providing a patch for the bug would be a fabulous third step.

   Thanks,
   Thomas

On Thu, Jun 28, 2012 at 8:08 AM, Rolf Sigg <rolf.sigg@ergon.ch> wrote:

> Hi,
>
> In our web application, we create dynamic pie charts with JFreeChart.
> Depending on the browser brand and version, we output bitmaps or SVG. The
> SVG code is produced by batik SVGGraphics2D.
>
> We noticed that some pie charts were empty if rendered as SVG but showing
> correctly if rendered as a bitmap (using java BufferedImage.createGraphics()
> **). After some investigation I found that for the faulty charts, batik
> produces SVG paths with elliptical arcs that have the same start- and end
> point. The SVG specification states that such arcs are omitted (
> http://www.w3.org/TR/SVG11/**implnote.html#**ArcOutOfRangeParameters<http://www.w3.org/TR/SVG11/implnote.html#ArcOutOfRangeParameters>).
> Therefore, the SVG renderers in the browsers (correctly) skip these path
> segments resulting in faulty chart display.
>
> However, in the Graphics2D API it is ok to represent circles by arcs.
> Arc2D are defined by the bounding rectangle without restriction.
>
> Since the input API of SVGGraphics2D is Graphics2D, I would expect batik
> to generate (visible) SVG representing every valid java input. Therefore I
> think this is a bug in SVGGraphics2D.
>
> Do you agree? Do I miss something?
>
> Regards
> Rolf
>
> P.S. Increasing the numeric precision may help in some situations. For me
> this may be a workaround, but not a solution.
>
>
> --
> rolf.sigg@ergon.ch, +41 44 268 89 00       http://www.ergon.ch
> Ergon Informatik AG, Kleinstrasse 15, 8008 Zurich, Switzerland
> ______________________________**______________________________**__
> e r g o n         smart people - smart software
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