/**
* Creates a spring between the two given nodes with the given strength. If the two nodes not
* directly connected by an edge already have a spring between them, it will be replaced by this
* one.
*
* @param node1 First of the two nodes to have a spring between them.
* @param node2 Second of the two nodes to have a spring between them.
* @param length The length of this spring (natural rest distance at which the two nodes would
* sit).
* @param strength The strength of this new spring.
* @return True if the viewer contains the two nodes and a spring between them has been created.
*/
public boolean addSpring(N node1, N node2, float length, float strength) {
Particle p1 = nodes.get(node1);
if (p1 == null) {
return false;
}
Particle p2 = nodes.get(node2);
if (p2 == null) {
return false;
}
// We may have to remove existing spring if it exists between these two nodes.
for (int i = 0; i < physics.getNumSprings(); i++) {
Spring spring = physics.getSpring(i);
if ((((spring.getOneEnd() == p1) && (spring.getTheOtherEnd() == p2))
|| ((spring.getOneEnd() == p2) && (spring.getTheOtherEnd() == p1)))
&& (spring.strength() != EDGE_STRENGTH)) {
physics.removeSpring(spring);
break;
}
}
// Add the new force.
physics.makeSpring(p1, p2, strength, DAMPING, length);
return false;
}
