A constant acceleration force type for the d3-force simulation engine.

This force accelerates nodes in a particular direction by a constant amount at each tick. Both the force strength and the direction can be set custom per node, or global for all the nodes equally.

It can be used, for example to simulate weight caused by earth's gravity (constant acceleration pointing down), as well as wind blowing or a current flowing in an arbitrary direction.

This force plugin is also compatible with d3-force-3d and can function in a one, two (default) or three dimensional space.

import d3ForceConstant from 'd3-force-constant';

or using a script tag

<script src="//unpkg.com/d3-force-constant"></script>

then

d3.forceSimulation()
    .nodes(<myNodes>)
    .force('gravity', d3.forceConstant()
        .strength(0.5)
        .direction(90)   
    );