vis.js is a dynamic, browser-based visualization library
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/**
* Created by Alex on 2/23/2015.
*/
class CentralGravitySolver {
constructor(body, physicsBody, options) {
this.body = body;
this.physicsBody = physicsBody;
this.setOptions(options);
}
setOptions(options) {
this.options = options;
}
solve() {
var dx, dy, distance, node, i;
var nodes = this.body.nodes;
var nodeIndices = this.physicsBody.physicsNodeIndices;
var forces = this.physicsBody.forces;
var gravity = this.options.centralGravity;
var gravityForce = 0;
for (i = 0; i < nodeIndices.length; i++) {
let nodeId = nodeIndices[i];
node = nodes[nodeId];
dx = -node.x;
dy = -node.y;
distance = Math.sqrt(dx * dx + dy * dy);
gravityForce = (distance == 0) ? 0 : (gravity / distance);
forces[nodeId].x = dx * gravityForce;
forces[nodeId].y = dy * gravityForce;
}
}
}
export default CentralGravitySolver;