content/fop/dev/svg.mdtext

Title: Apache(tm) FOP Development: SVG Issues

#Apache™ FOP Development: SVG Issues


See also [SVG User Documentation](../trunk/graphics.html#svg) for more information.

## Examples { #Examples}

These examples illustrate a number of issues relating to conversion to PDF:

<caption>SVG to PDF examples</caption>

|  | svg file | png file | pdf result |
|--|----------|----------|------------|
| images |  [images.svg](svg/images.svg)  |  [images.png](svg/images.png)  |  [images.pdf](svg/images.pdf)  |
| svg linking |  [link.svg](svg/link.svg)  |  [link.png](svg/link.png)  |  [link.pdf](svg/link.pdf)  |
| gradients and patterns |  [paints.svg](svg/paints.svg)  |  [paints.png](svg/paints.png)  |  [paints.pdf](svg/paints.pdf)  |
| various text and effects on text |  [text.svg](svg/text.svg)  |  [text.png](svg/text.png)  |  [text.pdf](svg/text.pdf)  |
| transparent objects |  [transparency.svg](svg/transparency.svg)  |  [transparency.png](svg/transparency.png)  |  [transparency.pdf](svg/transparency.pdf)  |

As can be seen most of the specific issues are handled.

<note>You will need Acrobat 5.0 to see transparency.</note>

<caption>XSL:FO to PDF examples</caption>

|  | fo file | pdf result |
|--|---------|------------|
| embedding svg |  [embedding.fo](fo/embedding.fo)  |  [embedding.fo.pdf](fo/embedding.fo.pdf)  |

## Developer Notes { #Developer-Notes}

For most output formats in FOP the SVG is simply drawn into an image with Batik. For PDF there are a set of classes to handle drawing the [GVT (Graphic Vector Toolkit)](http://xmlgraphics.apache.org/batik/using/architecture.html) into PDF markup.

### Classes { #Classes}

These are the relevant classes, found in the package org.apache.fop.svg:


-  *PDFGraphics2D*

    used for drawing onto a Graphics2D into an existing pdf document, used internally to draw the svg.

-  *PDFDocumentGraphics2D*

    used to create a pdf document and inherits from PDFGraphics2D to do the rest of the drawing. Used by the transcoder to create a standalone pdf document from an svg. Can be used independantly the same as any Graphics2D.

-  *PDFTranscoder*

    used by Batik to transcode an svg document into a standalone pdf, via PDFDocumentGraphics2D.

### Ideas { #Ideas}

Batik can convert ttf to svg font. This svg font could be converted into a pdf stroked font (type 3 font).