/**
* This helper calculates all the attractive forces onto a node. Attractive forces from from the
* edges pulling nodes towards each other, this will love through the edges of this node.
*
* @param current Node to calculate forces for.
*/
private void calculateNodeAttractiveForce(Node current) {
// get all the edges of the current node
ArrayList<Edge> nodeEdgeList = current.getEdgeList();
// of each of this node's edge do attactive forces
Iterator<Edge> nodeEdges = nodeEdgeList.iterator();
///
int numOfEdgesWeight = 10 * (int) Math.round(nodeEdgeList.size() + SPACING);
// Loop through edges and find edges containing current node
while (nodeEdges.hasNext()) {
Edge e = nodeEdges.next();
double edgeStrength = e.getStrength();
Node n;
int dx, dy;
double sign = 1.0;
if (current == e.getNode1()) {
n = e.getNode2();
dx = current.getX() - n.getX();
dy = current.getY() - n.getY();
} else {
n = e.getNode1();
dx = current.getX() - n.getX();
dy = current.getY() - n.getY();
sign = -1.0;
}
double distance = Math.sqrt(dx * dx + dy * dy) + .1;
// multiply by the strength of edge
// current.setVX(current.getVX() - dx / numOfEdgesWeight * edgeStrength);
// current.setVY(current.getVY() - dy / numOfEdgesWeight * edgeStrength);
current.accelx += sign * (dx * STIFFNESS * (SPRING_LENGTH - distance)) / current.weight;
current.accely += sign * (dy * STIFFNESS * (SPRING_LENGTH - distance)) / current.weight;
// current.accelx += sign * (dx * (e.getStrength() + 1) * (SPRING_LENGTH - distance) * 0.5) /
// current.weight;
// current.accely += sign * (dy * (e.getStrength() + 1) * (SPRING_LENGTH - distance) * 0.5) /
// current.weight;
// n.accelx += sign * (dx * (e.getStrength() + 1) * (SPRING_LENGTH - distance) * 0.5) /
// n.weight;
// n.accely += sign * (dy * (e.getStrength() + 1) * (SPRING_LENGTH - distance) * 0.5) /
// n.weight;
}
}
