vis.js is a dynamic, browser-based visualization library
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

35 lines
1.1 KiB

import BarnesHutSolver from "./BarnesHutSolver"
class ForceAtlas2BasedRepulsionSolver extends BarnesHutSolver {
constructor(body, physicsBody, options) {
super(body, physicsBody, options);
}
/**
* Calculate the forces based on the distance.
*
* @param distance
* @param dx
* @param dy
* @param node
* @param parentBranch
* @private
*/
_calculateForces(distance, dx, dy, node, parentBranch) {
if (distance === 0) {
distance = 0.1 * Math.random();
dx = distance;
}
let degree = (node.edges.length + 1);
// the dividing by the distance cubed instead of squared allows us to get the fx and fy components without sines and cosines
// it is shorthand for gravityforce with distance squared and fx = dx/distance * gravityForce
let gravityForce = this.options.gravitationalConstant * parentBranch.mass * node.options.mass * degree / Math.pow(distance,2);
let fx = dx * gravityForce;
let fy = dy * gravityForce;
this.physicsBody.forces[node.id].x += fx;
this.physicsBody.forces[node.id].y += fy;
}
}
export default ForceAtlas2BasedRepulsionSolver;