Jung图直线平行边

Question

Does Jung provide parallel straight edges without overlapping them? I want to obtain something like this

Is it possible to obtain this functionality without using QuadCurve/CubicCurve lines?

Answer 1

You can define your own edge shapes as is done in EdgeShape.java; specifically I would look at how BentLine is defined, since it would be fairly easy to modify to do something like what you want:

https://github.com/jrtom/jung/blob/master/jung-visualization/src/main/java/edu/uci/ics/jung/visualization/decorators/EdgeShape.java#L141

In particular, I wouldn't actually recommend using 2+ parallel straight lines as edges, because it's cleaner when the endpoints of the lines are all at the same place (and this is what the visualization and rendering code assumes). If you want the lines to be basically straight, use lines that are straight for most of their length and then bend at each end to meet at the endpoint, eg:

int index = getIndex(e, edgeIndexFunction);
float controlY = control_offset_increment + control_offset_increment * index;
BENT_LINE.reset();
BENT_LINE.moveTo(0.0f, 0.0f);
BENT_LINE.lineTo(0.1f, controlY);
BENT_LINE.lineTo(0.9f, controlY);
BENT_LINE.lineTo(1.0f, 1.0f);
return BENT_LINE;