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POwriting JUNG graphs to images: can't reliably render complete graph
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  1. POwriting JUNG graphs to images: can't reliably render complete graph
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    copied!<p>I've been using JUNG to visualize some simple graphs, and I'd like to write several of them to a PNG file. Unfortunately, the images often appear to render before the graph is finished painting, meaning that I get incomplete graphs -- that is, graphs where only a hanfdul of edges or nodes are drawn -- about half of the time. Rendering to screen works fine, which is part of why I'm so puzzled. As you'll see below, I tried a couple of workarounds, but they didn't help. It may be useful to know that the basicVisualizationServer I'm using won't paint anything useful to the BufferedImage directly -- I just get a black image when I try that.</p> <p>Thanks!</p> <pre><code> public void writeImage(String filename) { Layout layout = new CircleLayout&lt;V, E&gt;(jungGraph); layout.setSize(innerSize); bvs = new BasicVisualizationServer&lt;V,E&gt;(layout); float strokeWidth = 8f; bvs.getRenderContext().setVertexShapeTransformer(new ConstantTransformer(new Ellipse2D.Float(-24,-24,48,48))); bvs.getRenderContext().setArrowDrawPaintTransformer(new ConstantTransformer(Color.black)); bvs.getRenderContext().setEdgeStrokeTransformer(new ConstantTransformer(new BasicStroke(strokeWidth))); bvs.getRenderContext().setEdgeArrowStrokeTransformer(new ConstantTransformer(new BasicStroke(strokeWidth))); bvs.getRenderContext().setEdgeLabelTransformer(new ToStringLabeller&lt;E&gt;()); bvs.getRenderContext().setVertexLabelTransformer(new ToStringLabeller&lt;V&gt;()); bvs.setPreferredSize(viewSize); //int width = bvs.getWidth(); // Always returns zero int width = viewFrame.getWidth(); //int height = bvs.getHeight(); // Always returns zero int height = viewFrame.getHeight(); BufferedImage bim = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = bim.createGraphics(); viewFrame.paintAll(g); g.dispose(); //this.viewFrame.paintComponents(g); //try{Thread.sleep(1000);} catch(Exception e) {throw new RuntimeException(e);} // Sleeping doesn't help. try { File f = new File(filename); ImageIO.write(bim,"png",f); System.out.println("wrote image for " + jungGraph + " to "+ filename+ ":" + f.toString()); //try{Thread.sleep(500);} catch(Exception e) {throw new RuntimeException(e);} // Doesn't help } catch (Exception e) { throw new RuntimeException(e); } } </code></pre>
 

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