repulsion.js

var cushion = .5;
var length = 50;

var dx = point.x - mouse.x;
var dy = point.y - mouse.y;
var da = Math.sqrt(dx * dx + dy * dy);

// Tend à ramener la distance entre les segments à length
var ox = dx / da * length - dx;
var oy = dy / da * length - dy;

point.x += ox * cushion;
point.y += oy * cushion;