Drawing directed edges programmatically in Prefuse

java, prefuse

Solution

You need to set the `FILLCOLOR` for edges:

filter.add(new ColorAction(edges, VisualItem.FILLCOLOR, 
    ColorLib.rgb(100,100,100));

I reproduce the problem with the `RadialGraphView` demo and I did not need any changes to the source code except for this line. (Though, I had to change the data file.)

Problem

I use the following code to display a graph: ``` graph = new Graph(true); vis = new Visualization(); vis.add(GRAPH, graph); CustomLabelRenderer re = new CustomLabelRenderer(); re.setImageField(NODE_TYPE_IMAGE); re.setImagePosition(Constants.TOP); EdgeRenderer edgeRenderer = new EdgeRenderer(Constants.EDGE_TYPE_LINE, Constants.EDGE_ARROW_FORWARD); edgeRenderer.setArrowType(Constants.EDGE_ARROW_FORWARD); edgeRenderer.setArrowHeadSize(10, 10); DefaultRendererFactory factory = new DefaultRendererFactory(re, edgeRenderer); factory.add(new InGroupPredicate(EDGE_DECORATORS), new LabelRenderer(VisualItem.LABEL)); vis.setRendererFactory(factory); ``` As you can see instantiate the graph to use directed edges. Afterwards I set the EdgeRenderer to use arrow heads. However, I can't see any arrows on my edges, but just plain lines. What am I doing wrong? That's how I add edges: ``` graph.addEdge(node1, node2); ```

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