private BreakableBody(World world)
{
World = world;
World.ContactManager.PostSolve += PostSolve;
State = BreakableBodyState.Unbroken;
}
private void Decompose()
{
if (State == BreakableBodyState.Broken)
{
throw new InvalidOperationException("BreakableBody is allready broken");
}
//Unsubsribe from the PostSolve delegate
World.ContactManager.PostSolve -= PostSolve;
for (int i = 0; i < Parts.Count; i++)
{
Fixture oldFixture = Parts[i];
Shape shape = oldFixture.Shape.Clone();
object fixtureTag = oldFixture.Tag;
MainBody.Remove(oldFixture);
Body body = World.CreateBody(MainBody.Position, MainBody.Rotation, BodyType.Dynamic);
body.Tag = MainBody.Tag;
Fixture newFixture = body.CreateFixture(shape);
newFixture.Tag = fixtureTag;
Parts[i] = newFixture;
body.AngularVelocity = _angularVelocitiesCache[i];
body.LinearVelocity = _velocitiesCache[i];
}
World.Remove(MainBody);
State = BreakableBodyState.Broken;
}
private void PostSolve(Contact contact, ContactVelocityConstraint impulse)
{
if (State != BreakableBodyState.Broken)
{
if (Parts.Contains(contact.FixtureA) || Parts.Contains(contact.FixtureB))
{
float maxImpulse = 0.0f;
int count = contact.Manifold.PointCount;
for (int i = 0; i < count; ++i)
{
maxImpulse = Math.Max(maxImpulse, impulse.points[i].normalImpulse);
}
if (maxImpulse > Strength)
{
// Flag the body for breaking.
State = BreakableBodyState.ShouldBreak;
}
}
}
}
