private void Split(CollisionConvexPolygon box)
{
var newPolygonShape = _structure.Split(box);
var center = box.GetCenterInWorldSpace();
// TODO: Part is dead?
// A boss part is dead when its center is dead?
// or when the number of sub-parts is less than a number?
if (center.X > (Size.X / 2f - 2 * _step) + Position.X - Origin.X &&
center.X < (Size.X / 2f + 2 * _step) + Position.X - Origin.X)
{
TakeDamage(99999);
}
else
{
var boxLocalPosition = box.GetLocalPosition();
// Left (1) or right (-1) part?
var factor = (boxLocalPosition.X > Origin.X) ? 1 : -1;
// If the break out part is not large enough => we don't create another part
if (newPolygonShape.Vertices != null && newPolygonShape.GetArea() > Config.MinBossPartArea)
{
var bossPart = new BossPart(
GameRef, _bossRef, _players, _moverManager, null, _color,
_health, 0, 25f, null, newPolygonShape
);
bossPart.Initialize();
var bossPartSize = newPolygonShape.GetSize();
var boxWorldPosition = box.GetWorldPosition();
// Compute new boss part's world position
var worldPosition = Vector2.Zero;
worldPosition.Y = boxWorldPosition.Y - boxLocalPosition.Y;
// Left part
if (factor == 1)
worldPosition.X = boxWorldPosition.X - bossPartSize.X;
// Right part
else if (factor == -1)
worldPosition.X = boxWorldPosition.X + _step;
// Update world position according to parent rotation
bossPart.Scale = Scale;
bossPart.Rotation = Rotation;
var newLocalPosition = Vector2.Zero;
newLocalPosition.X = (Position.X - Origin.X) + (boxLocalPosition.X);
newLocalPosition.Y = (Position.Y - Origin.Y);
if (factor == -1)
newLocalPosition.X -= bossPartSize.X;
else
newLocalPosition.X += _step;
var newOrigin = newPolygonShape.GetCenter();
newLocalPosition += newOrigin;
var rotationOrigin = Position;
newLocalPosition = Vector2.Transform(newLocalPosition - rotationOrigin, Matrix.CreateRotationZ(Rotation)) + rotationOrigin;
bossPart.Origin = newOrigin;
bossPart.Position = newLocalPosition;
_bossRef.Parts.Add(bossPart);
// Give to this new BossPart an impulsion to (pseudo) random direction due to explosion
var random = (float)(GameRef.Rand.NextDouble() * (1f - 0.75f)) + 0.75f;
bossPart.ApplyImpulse(new Vector2(factor, random * factor), new Vector2(random / 5f));
ApplyImpulse(new Vector2(-factor, random * -factor), new Vector2(random / 5f));
}
// Remove destroyed bounding boxes
if (factor == -1)
CollisionBoxes.RemoveAll(bb => bb.GetCenter().X < boxLocalPosition.X);
else
CollisionBoxes.RemoveAll(bb => bb.GetCenter().X > boxLocalPosition.X);
// This is the bounding that the player has destroyed, so we remove it from the list
CollisionBoxes.Remove(box);
}
}
