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Elm particle library (see README and examples folder)
version 1.0.3
license BSD3
native-modules False
elm-version 0.18.0 <= v < 0.19.0
Tag 1.0.3
Committed At 2018-02-14 15:26:02 UTC
jxxcarlson/geometry 1.0.2 <= v < 2.0.0 1.0.2
elm-lang/svg 2.0.0 <= v < 3.0.0 2.0.0
elm-lang/html 2.0.0 <= v < 3.0.0 2.0.0
elm-lang/core 5.1.1 <= v < 6.0.0 5.1.1

Modules

README

Particle

Particle is a package for simple physics simulations. The idea is to set up a particle with a certain mass, initial position, initial velocity, and shape (rectangle or ellipse for now). Then to define a field, e.g. the gravitational field. The package gives tools for constructing

     orbit = [a, f a, f^2 a, ... , f^n a]

where a is the particle in its initial state and the function f is the "next-state" function which evolves the particle according to some discrete version of Newton's laws of motion. The resulting list of particles can then be rendered as a list of SVG elements by

    renderedOrbit = List.map draw orbit

I will document this better later , but for now, look in the examples folder for demo code:

Demo 1:

   $ cd examples
   $ elm make StaticBouncingBall.elm

Demo 2:

   $ elm make BouncingBall.elm

In both cases a ball is subject to two forces. The first is the constant downward force of gravity. The second is a short-range upward force localized in the "floor". This force decays exponentially with height.

NOTE: If you look at the simulations, you will see that "the angle of reflection is equal to the angle of incidence." This is achieved by solving the equations of motion, not by using ray optics.

NOTE: I need to do some optimization in Demo 2. The simulation slows down as it progresses. Pull requests appreciated!