Particle View: A New Way to Watch History Unfold

Beyond Filled Polygons

Since the beginning, Moving Polygons has visualized territorial change using colored, filled polygons that morph smoothly from one shape to the next. It works well — but we wanted to offer something more visually striking. Something that makes you feel the movement of borders rather than just see it.

That's Particle View. Instead of rendering territories as solid filled regions, this mode breaks each polygon into hundreds or thousands of individual colored dots. When borders shift, those particles flow from one shape to another in an organic, swarm-like animation. Empires don't just grow — they scatter outward. Territories don't just shrink — they dissolve.

How It Works

Behind the scenes, the system generates a set of points inside each polygon using a seeded random distribution. Points are placed both across the interior and along the edges to preserve the recognizable shape of each territory. When a polygon transitions to a new shape — say, an empire expanding after a conquest — the particles are matched between the old and new geometries and animated along their paths.

The result is a fluid motion where particles hold steady during stable periods and then flow into their new positions during transitions. Spawning particles fade in, disappearing ones fade out, and a subtle wobble effect gives the whole animation an organic, almost biological quality. The system handles up to 30,000 simultaneous particles while maintaining smooth performance.

When to Use It

Particle View is available on any published map that has polygon transitions. You'll find the toggle in the legend panel on the left side of the map — just click "Switch to Particle View" to try it out. You can switch back to the classic fill view at any time.

It works particularly well for maps with dramatic territorial changes: empires that expand rapidly, states that fragment into smaller pieces, or borders that shift back and forth over centuries. The particle animation makes these changes feel more dynamic and immediate than a traditional polygon fill.

Particle View also works with GIF export, so you can capture the swarm animation and share it as a looping image — perfect for social media or presentations where you want to grab attention.