You can now directly upload arch-style diagrams to Wikimedia Commons under your own username with this new interface. Please submit bug reports and feature requests at the project's issue tracker.
This is a tool to generate arch-shaped parliament diagrams.

To use this tool, fill in the name and support of each party in the legislature, clicking "Add a party" whenever you need to add a new party. Then click "Make my diagram", and a link will appear to your SVG diagram. You can then freely download and use the diagram, but to use the diagram in Wikipedia, you should upload it to Wikimedia Commons. You can now do this directly, by clicking on the green button to create an upload link. Click on the link and follow the instructions: it will upload the file under your username, including the list of parties in the file description. This tool will automatically add your file to the election apportionment diagrams category, but you should categorise it in more detail after uploading.
Party 1 name

Party 1 delegates

Party 1 color

Party 1 border

Party 1 border color

Delete party 1

Add a party
Make my diagram