iPhone app Gravitational Totem

Generate simple graphs based on simplified gravitational rigid objects.

Drag to draw a smooth polygon where many rigid objects will be generated randomly.If you click or draw a very small polygon, a large ellipse region will be used as the origin region instead.
These objects will be attracted by gravitation among uniform spheres on them.
Some objects will merge to generate a simple interesting graph after several seconds.

If an object intersects another object, we assume that they will stick together and form a new rigid body object immediately.
Otherwise the gravitation or point-simplified torque between spheres in different rigid objects will be calculated to update the location or orientation of objects.
The objects are updated with a simple leapfrog integration which is not expected to be accurate for a long time or large step.,

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