gistfile1.txt

void computeForce(TileSheetNode& node, TileSheetNode& childNode, bool keepClose)
{
	float dist = distance(node.mPos, childNode.mPos);
	if (dist < 0.01f)
	{
		return;
	}
	float idealDist = node.mRadius + childNode.mRadius;
	vec_t dir = normalized(node.mPos - childNode.mPos);
	float dif = idealDist - dist;
	vec_t force = dir * dif * 0.5f;

	if (keepClose)
	{
		if (dif > 0.f)
			return;
		// move a bit
		node.mPos += force * 1.0f;
		childNode.mPos -= force * 1.0f;
	}
	else
	{
		if (dif < 0.f)
			return;
		node.mForce += force * 0.3f;
		childNode.mForce -= force * 0.3f;
	}
}