It divides the diagram up into a left wing, a right wing, a cross-bench section and a Speaker / Leader section. You add the parties as usual, but now you also have to select where in the layout they appear.
In response to a discussion on Wikipedia, I have added two controls to modify the appearance of the spots:
- Corner radius: how rounded are the squares that represent an individual representative?
- Spacing: How much white space is there between the spots?
Once we have a consensus at Wikipedia on which settings look nice, I'll hard-code these two settings into the final script, so that we have a consistent look. Until then, feel free to customise your diagram as you see fit.
You'll notice that I made the size of the spots in the "speaker" section independent of the scale of the rest of the diagram. If I didn't do this, it would lead to significant weirdnesses.
Please make some diagrams with varying numbers of parties and delegates, and let me know what you think of the layout and other style choices. As usual, the best place to make bug reports is Github. Feel free to contact me at Wikipedia as well.