public void Control(float thrust, float torque, bool firing)
{
Firing = firing;
thrust = Fmath.Clamp(thrust, 0.0f, 1.0f);
if (torque == 0)
{
// This is negative feedback, so im unsure why torque and angular velocity have different signs.
torque = AngularVelocity * 10f;
}
torque = Fmath.Clamp(torque, -1.0f, 1.0f);
/*
* float epsilon = 0.001f;
* if (torque < epsilon && torque > -epsilon)
* {
* float dt = (CollisionBody.AngularVelocity > epsilon) ? 1f : ((CollisionBody.AngularVelocity < -epsilon) ? -1f : 0f);
* torque = dt;
* }
*/
CollisionBody.AddForce(Fmath.CosSin(Angle, Thrust * thrust));
CollisionBody.AddTorque(Torque * torque);
}
public override void OnDestroy()
{
float subsize = Size / 2;
if (subsize > MinimumSize)
{
Vector2 ecc = Fmath.Rotate(new Vector2(Size / 4, Size / 4), Angle);
// Hack to pull the pending forces out of the collision system and applying them immediately.
Velocity += (CollisionBody.Force / 60f) * CollisionBody.InvMass;
for (int i = 0; i < 4; i++)
{
ecc = Fmath.RotatePos(ecc);
Asteroid subasteroid = new Asteroid(
Position + ecc,
Velocity + ecc * EjectionVelocity / Size,
subsize,
Angle,
AngularVelocity + EjectionRotation - Fmath.RandF(2 * EjectionRotation)
);
Context.AddEntity(subasteroid);
}
}
else
{
Context.AddEvent(new Explosion(Position, Size * 1.5f, 1f, Color.White));
}
base.OnDestroy();
}
public override void Predict(long timestamp)
{
long delta = timestamp - baseTimestamp;
float deltas = (delta / 1000.0f);
Velocity = baseVelocity + Fmath.CosSin(Angle, Acceleration * deltas);
Position = basePosition + (baseVelocity * deltas) + Fmath.CosSin(Angle, Acceleration * (deltas * deltas) / 2);
Angle = baseAngle + (AngularVelocity * deltas);
}
public override void Draw(SpriteBatch batch)
{
Color color = (Creator == null) ? Color.White : Color.Lerp(Creator.Color, Color.White, 0.5f);
float gSize = Fmath.Sqrt(Size) + 0.1f;
Drawing.DrawTriangle(batch, Position, new Vector2(15, 5) * gSize, Angle, color);
float tSize = gSize * Velocity.Length() / 6f;
Drawing.DrawBullet(batch, Position - Fmath.CosSin(Angle, (12f + tSize) / 2f * gSize), new Vector2(tSize, 6) * gSize, Angle, color);
}
private Ship NewPlayer(Color color)
{
return(new Ship(
Fmath.RandomVector(Boundary / 2) + (Boundary / 4),
Fmath.CosSin(Fmath.RandAngle(), Fmath.RandF(50)),
color,
Fmath.RandAngle(),
Fmath.RandF(1f)
));
}
private Asteroid NewAsteroid(float scale)
{
return(new Asteroid(
Fmath.RandomVector(Boundary),
Fmath.CosSin(Fmath.RandAngle(), Fmath.RandF(50)),
scale / 2 + Fmath.RandF(scale / 2),
Fmath.RandAngle(),
Fmath.RandF(1f)
));
}
public Projectile(Ship creator)
{
Position = creator.Position;
Angle = creator.Angle;
Velocity = creator.Velocity + Fmath.CosSin(Angle, Speed);
AngularVelocity = 0f;
Position += Fmath.CosSin(Angle) * creator.Size.X / 2;
Creator = creator;
Creator.Push(-Fmath.CosSin(Angle, Recoil));
}
public Missile(Ship creator, float size)
{
Size = size;
Position = creator.Position;
Angle = creator.Angle;
baseVelocity = creator.baseVelocity + Fmath.CosSin(Angle, Speed);
AngularVelocity = 0f;
Position += Fmath.CosSin(Angle) * creator.Size.X / 2;
Velocity = baseVelocity;
Creator = creator;
Creator.Push(-Fmath.CosSin(Angle, Recoil));
}
public override void OnCollide(Physical phys)
{
IsDestroyed = true;
float sqrtSize = Fmath.Sqrt(Size);
float aoe = ExplosiveArea * sqrtSize;
foreach (Physical p in Context.GetEntitiesWithin(Position, aoe))
{
Vector2 deltaPos = p.Position - Position;
float alpha = 1f - (deltaPos.Length() / (aoe * 1.2f));
if (alpha > 0)
{
deltaPos.Normalize();
p.Push(deltaPos * alpha * ExplosiveForce * Size);
p.Hitpoints -= alpha * ExplosiveDamage * Size;
}
}
Context.AddEvent(new Explosion(Position, 50f * sqrtSize, 1.5f * sqrtSize, Creator.Color));
}
public override void Update(float delta)
{
Position = CollisionBody.Position;
Angle = CollisionBody.Angle;
if (Angle > MathHelper.TwoPi || Angle < MathHelper.TwoPi)
{
Angle = Fmath.Mod(Angle, MathHelper.TwoPi);
}
if ((CollisionBody.LinearVelocity - Velocity).LengthSquared() > VelocityTolerance * VelocityTolerance ||
(Fmath.Abs(CollisionBody.AngularVelocity - AngularVelocity) > VelocityTolerance))
{
RequestMotionUpdate();
}
if (Hitpoints < 0)
{
IsDestroyed = true;
}
}
public override void Update(float delta)
{
Velocity += Fmath.CosSin(Angle, Acceleration) * delta;
base.Update(delta);
}
public Point2 PositionToGrid(Vector2 position)
{
return(new Point2(Fmath.Floor(position.X / TileSize),
Fmath.Floor(position.Y / TileSize)));
}