gistfile1.js

Graph.prototype.forces = function(){

	for(var i=0; i<this.nodesList.length; i++){
		netForceX = 0;
		netForceY = 0;
		var dsq;
		var a = this.nodesList[i];
		/*calculate repulsion*/
		for(var j=0; j<this.nodesList.length; j++){
			var b = this.nodesList[j];
			if(j!=i){
				// net-force := net-force + Coulomb_repulsion( this_node, other_node )

				netForceY+=0;//coloumbForY;
				netForceX+=0;//coloumbForX;

				dsq = (a.x - b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y);
				if(dsq==0) dsq = 0.001;
				var c = this.repulsion/dsq;
				a.velX += c * (a.x-b.x);
				a.velY += c * (a.y-b.y);
			}
		}
		var neighbours = this.getNodeNeighbours(i);

		for(var j=0; j<neighbours.length; j++){
			// net-force := net-force + Hooke_attraction( this_node, spring )

			var b = this.nodesList[neighbours[j]];
			a.velX += this.attraction*(b.x - a.x);
			a.velY += this.attraction*(b.y - a.y);
			b.velX += this.attraction*(a.x - b.x);
			b.velY += this.attraction*(a.y - b.y);
		}

		var dis = 0;
		for(var j=0; j<this.nodesList.length; j++){
			
		    a = this.nodesList[i];
			
			a.x = (a.x + a.velX/20)*0.9;
			a.y = (a.y + a.velY/20)*0.9;

			
		}
	}
}