Settings - JSFiddle - Code Playground

djwelsh's public fiddles

Calculate SVG path length to a specified point

Answer to SO question: http://stackoverflow.com/questions/28797761/in-d3-js-is-there-any-way-to-get-the-path-length-at-particular-point We draw a new sub-path to calculate the length to a point part way along the full path

Force Vector Split :: III

Shows how a force vector is split into linear and rotational forces based on the distance from the polygon center and the angle of the force from said center. Then pushes the shape based on these vectors. You can now choose the point and angle of the force. As far as I can tell, the linear motion seems to agree with my paper calculations. Rotational motion is harder to figure, but it seems correct, assuming my torque calculations are not in error. It seems that the poly does what it intuitively would do, given its mass and the size of the force.

Force Vector Split :: II

Shows how a force vector is split into linear and rotational forces based on the distance from the polygon center and the angle of the force from said center. Then pushes the shape based on these vectors.

Force Vector Split :: I

Shows how a force vector is split into linear and rotational forces based on the distance from the polygon center and the angle of the force from said center.

Particles - Polygon Moment of Inertia

Now angular momentum seems to work. Changing mass makes moment of inertia change accordingly; higher masses mean rotation is harder. Can apply torque given an arbitrary value, but cannot apply torque based on a force vector.

Particles - Rain

This is a RW-accurate particle dropper. Particles have a random mass from 1 to 100 kg. This is denoted by their size. Since mass has no effect on gravitational pull, they all fall at the same rate. On death, the particles automatically respawn in a random position in the sky. This gives the illusion after a while of rain, since they all start at different times and different positions, though they all still fall at the speed of gravity, as it were.