public static void ApplyExplosionForces(Vector2 worldPosition, Attack attack, float force)
{
if (attack.Range <= 0.0f)
{
return;
}
foreach (Character c in Character.CharacterList)
{
Vector2 explosionPos = worldPosition;
if (c.Submarine != null)
{
explosionPos -= c.Submarine.Position;
}
explosionPos = ConvertUnits.ToSimUnits(explosionPos);
Dictionary <Limb, float> distFactors = new Dictionary <Limb, float>();
foreach (Limb limb in c.AnimController.Limbs)
{
float dist = Vector2.Distance(limb.WorldPosition, worldPosition);
//calculate distance from the "outer surface" of the physics body
//doesn't take the rotation of the limb into account, but should be accurate enough for this purpose
float limbRadius = Math.Max(Math.Max(limb.body.width * 0.5f, limb.body.height * 0.5f), limb.body.radius);
dist = Math.Max(0.0f, dist - FarseerPhysics.ConvertUnits.ToDisplayUnits(limbRadius));
if (dist > attack.Range)
{
continue;
}
float distFactor = 1.0f - dist / attack.Range;
//solid obstacles between the explosion and the limb reduce the effect of the explosion by 90%
if (Submarine.CheckVisibility(limb.SimPosition, explosionPos) != null)
{
distFactor *= 0.1f;
}
distFactors.Add(limb, distFactor);
c.AddDamage(limb.WorldPosition, DamageType.None,
attack.GetDamage(1.0f) / c.AnimController.Limbs.Length * distFactor,
attack.GetBleedingDamage(1.0f) / c.AnimController.Limbs.Length * distFactor,
attack.Stun * distFactor,
false);
if (limb.WorldPosition != worldPosition && force > 0.0f)
{
Vector2 limbDiff = Vector2.Normalize(limb.WorldPosition - worldPosition);
if (!MathUtils.IsValid(limbDiff))
{
limbDiff = Rand.Vector(1.0f);
}
Vector2 impulsePoint = limb.SimPosition - limbDiff * limbRadius;
limb.body.ApplyLinearImpulse(limbDiff * distFactor * force, impulsePoint);
}
}
//sever joints
if (c.IsDead && attack.SeverLimbsProbability > 0.0f)
{
foreach (Limb limb in c.AnimController.Limbs)
{
if (!distFactors.ContainsKey(limb))
{
continue;
}
foreach (LimbJoint joint in c.AnimController.LimbJoints)
{
if (joint.IsSevered || (joint.LimbA != limb && joint.LimbB != limb))
{
continue;
}
if (Rand.Range(0.0f, 1.0f) < attack.SeverLimbsProbability * distFactors[limb])
{
c.AnimController.SeverLimbJoint(joint);
}
}
}
}
}
}