Using the ySVG Extension Package

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Using the ySVG Extension Package
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Using the ySVG Extension Package

Class SVGIOHandler from the extension package provides the yFiles library with export support for the SVG file format. It is a direct subclass of abstract class IOHandler from package y.io of the yFiles library, see also Figure 11.1, “SVG output handler class hierarchy”.

Figure 11.1. SVG output handler class hierarchy

The code fragment in Example 11.1, “Instantiating a SVGIOHandler” shows how to instantiate and use a SVGIOHandler to export the content of a given Graph2DView to a SVG-encoded file. Class SVGZIOHandler can be used in a similar manner to write Zip-compressed SVG files which are up to 50 times smaller than their uncompressed counterparts.

Example 11.1. Instantiating a SVGIOHandler

public void exportSVG(Graph2DView view) {
  // Instantiate a SVG output handler and export the view's content.
  try {
    IOHandler ioh = new SVGIOHandler();
    double tmpPDT = view.getPaintDetailThreshold();
    view.setPaintDetailThreshold(0.0);
    ioh.write(view.getGraph2D(), "MySVG.svg");
    view.setPaintDetailThreshold(tmpPDT);
  }
  catch (IOException ioEx) {
    // Something went wrong. Complain. 
  }
}

Using SVG Content

Besides exporting the content of a Graph2DView to SVG, the ySVG extension package also enables to directly use SVG content for the representation of a graph's nodes. Either of the classes SVGNodeRealizer or SVGPainter can be used to this end. Both use an SVGModel that holds the actual SVG content:

SVGPainter is a specialized implementation of static inner interface GenericNodeRealizer.Painter which is used in conjunction with class GenericNodeRealizer. It is registered with a realizer's configuration as discussed in the section called “Class GenericNodeRealizer”.
SVGNodeRealizer is a true yFiles NodeRealizer implementation. Tutorial demo applications SimpleSVGNodeRealizerDemo.java and SVGNodeRealizerDemo.java show how to use SVGNodeRealizer.