public BulletSplitter(GameScreen scrn, Bullet b, Direction8 d) : base(scrn)
{
scale = b.Scale;
ShapePosition = b.BulletPosition;
ShapeAlpha = 1f;
Fraction = b.Fraction;
velocity = VELOCITIES[(int)d] * FloatMath.GetRangedRandom(0.5f, 2f) + ConvertUnits.ToDisplayUnits(b.PhysicsBody.LinearVelocity)/10f;
maxLifetime = FloatMath.GetRangedRandom(SPLITTER_LIFETIME_MIN, SPLITTER_LIFETIME_MAX);
ShapeRotation = FloatMath.ToRadians((int) d * 45f);
rotationSpeed = FloatMath.GetRangedRandom(-FloatMath.TAU, FloatMath.TAU);
DrawingBoundingBox = new FSize(Bullet.BULLET_DIAMETER, Bullet.BULLET_DIAMETER) * scale;
}
// ignore all bullets
private bool IsHoming(Bullet b)
{
//TODO: Optimize IsHoming()
// We could cache the target cannon in every bullet
// and update it on collision or creation
// would be faster (?) - optimization opportunity for later
// i should measure how expensive ray tracing is
GameEntity result = null;
Func<Fixture, Vector2, Vector2, float, float> callback = (f, pos, normal, frac) =>
{
if (f.UserData is Bullet) // ignore _all_ Bullets
{
return -1; // ignore
}
result = (GameEntity)f.UserData;
return frac; // limit to this length
};
var rayStart = b.PhysicsBody.Position;
var rayEnd = rayStart + b.PhysicsBody.LinearVelocity * ConvertUnits.ToSimUnits(GDConstants.VIEW_WIDTH) / b.PhysicsBody.LinearVelocity.Length();
Owner.GetPhysicsWorld().RayCast(callback, rayStart, rayEnd);
return (result == Cannon);
}