// TODO: change this for group only after node grouping
// Coulombs Law explains what force
// Force = (constant * | q1 * q2| )
// -------------------------
// distance^2
protected void applyCoulombsLaw()
{
foreach (Node n1 in graph.nodes)
{
Point point1 = GetPoint(n1);
foreach (Node n2 in graph.nodes)
{
Point point2 = GetPoint(n2);
if (point1 != point2)
{
AbstractVector d = point1.position - point2.position;
float distance = d.Magnitude() + 0.1f;
AbstractVector direction = d.Normalize();
if (n1.Pinned && n2.Pinned)
{
point1.ApplyForce(direction * 0.0f);
point2.ApplyForce(direction * 0.0f);
}
else if (n1.Pinned)
{
point1.ApplyForce(direction * 0.0f);
//point2.ApplyForce((direction * Repulsion) / (distance * distance * -1.0f));
point2.ApplyForce((direction * Repulsion) / (distance * -1.0f));
}
else if (n2.Pinned)
{
//point1.ApplyForce((direction * Repulsion) / (distance * distance));
point1.ApplyForce((direction * Repulsion) / (distance));
point2.ApplyForce(direction * 0.0f);
}
else
{
// point1.ApplyForce((direction * Repulsion) / (distance * distance * 0.5f));
// point2.ApplyForce((direction * Repulsion) / (distance * distance * -0.5f));
point1.ApplyForce((direction * Repulsion) / (distance * 0.5f));
point2.ApplyForce((direction * Repulsion) / (distance * -0.5f));
}
}
}
}
}
protected void attractToCentre()
{
foreach (Node n in graph.nodes)
{
Point point = GetPoint(n);
if (!point.node.Pinned)
{
AbstractVector direction = point.position * -1.0f;
//point.ApplyForce(direction * ((float)Math.Sqrt((double)(Repulsion / 100.0f))));
float displacement = direction.Magnitude();
direction = direction.Normalize();
point.ApplyForce(direction * (Stiffness * displacement * 0.4f));
}
}
}
