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From Thomas E Deweese <thomas.dewe...@kodak.com>
Subject RE: How to rasterize SVG into a Java Image object?
Date Mon, 07 Oct 2002 12:03:53 GMT
>>>>> "P" == Petilon  <petilon@yahoo.com> writes:

P> I want to make a Java Image object out of an SVG file.  At first I
P> thought org.apache.batik.transcoder.image.ImageTranscoder would be
P> able to do it. However, it turns out this is an abstract class.

   It is an abstract class that takes care of rasterizing an SVG to a
BufferedImage so you can stick in the few lines of code needed to
write it to the format you want (such as your BMP encoder).

P> If I want to rasterize, I am forced to choose between JPEG, TIFF
P> and PNG. Why? Why can't Batik just give me an Image object and then
P> let me do whatever I want with it? That I will be able to leverage
P> my existing BMP output class (which takes a BufferedImage as
P> input), instead of writing my own subclass of ImageTranscoder.

   There are a number of reasons the simplest to explain is that SVG
is a scalable format (i.e. it has no strong notion of what size it
should be rendered at) a lot of what the ImageTranscoder baseclass
does is try and figure out a good mapping to pixels it also provides
hooks to adjust this output.

P> Why doesn't Batik do this obvious thing? Or can it already render
P> into a BufferedImage?

   I don't understand why you are so offended that you need to write a
subclass to plug in your own output format, Java is an object oriented
language, this is entirely natural (it's not like the subclass is
particularly complex, take a look a the PNG encoder, it's about a page
of real code and it's one of the more complex outputs.

   There are other routes to a BufferedImage as well, one is the
batik.gvt.StaticRenderer class, but then you need to figure out the
mapping from user space to device pixels.

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