public static ParticleState GetRandom(float minVel, float maxVel)
{
var state = new ParticleState();
state.Velocity = rand.NextVector2(minVel, maxVel);
state.Type = ParticleType.None;
state.LengthMultiplier = 1;
return state;
}
public override void Update()
{
var entities = EntityManager.GetNearbyEntities(Position, 250);
foreach (var entity in entities)
{
if (entity is Enemy && !(entity as Enemy).IsActive)
continue;
// bullets are repelled by black holes and everything else is attracted
if (entity is Projectile)
entity.Velocity += (entity.Position - Position).ScaleTo(1f);
else
{
var dPos = Position - entity.Position;
var length = dPos.Length();
entity.Velocity += dPos.ScaleTo(MathHelper.Lerp(2, 0, length / 250f));
}
}
// The black holes spray some orbiting particles. The spray toggles on and off every quarter second.
if ((GameplayScreen.GameTime.TotalGameTime.Milliseconds / 250) % 2 == 0)
{
Vector2 sprayVel = Methods.FromPolar(sprayAngle, rand.NextFloat(12, 15));
Color color = Methods.HSVToColor(5, 0.5f, 0.8f); // light purple
Vector2 pos = Position + 2f * new Vector2(sprayVel.Y, -sprayVel.X) + rand.NextVector2(4, 8);
var state = new ParticleState()
{
Velocity = sprayVel,
LengthMultiplier = 1,
Type = ParticleType.Enemy
};
GameplayScreen.ParticleManager.CreateParticle(GameplayScreen.ParticleTexture, pos, color, 190, 1.5f, state);
}
// rotate the spray direction
sprayAngle -= MathHelper.TwoPi / 50f;
GameplayScreen.GridManager.ApplyImplosiveForce((float)Math.Sin(sprayAngle / 2) * 10 + 20, Position, 40);
}
public void Kill()
{
PlayerStatus.RemoveLife();
framesUntilRespawn = PlayerStatus.IsGameOver ? 100 : 120;
float hue1 = rand.NextFloat(0, 6);
Color explosionColor = Methods.HSVToColor(hue1, 0.5f, 1);
for (int i = 0; i < 1200; i++)
{
float speed = 18f * (1f - 1 / rand.NextFloat(1f, 10f));
Color color = Color.Lerp(Color.Blue, explosionColor, rand.NextFloat(0, 1));
var state = new ParticleState()
{
Velocity = rand.NextVector2(speed, speed),
Type = ParticleType.None,
LengthMultiplier = 1
};
GameplayScreen.ParticleManager.CreateParticle(GameplayScreen.ParticleTexture, Position, color, 190, 1.5f, state);
}
GameplayScreen.cue = GameplayScreen.soundBank.GetCue("explode");
GameplayScreen.cue.Apply3D(GameplayScreen.listener, GameplayScreen.emitter);
GameplayScreen.cue.Play();
}
public void WasShot()
{
IsDestroyed = true;
PlayerStatus.AddPoints(PointValue);
float hue1 = rand.NextFloat(0, 6);
float hue2 = (hue1 + rand.NextFloat(0, 2)) % 6f;
Color color1 = Methods.HSVToColor(hue1, 0.5f, 1);
Color color2 = Methods.HSVToColor(hue2, 0.5f, 1);
for (int i = 0; i < 120; i++)
{
float speed = 18f * (1f - 1 / rand.NextFloat(1, 10));
var state = new ParticleState()
{
Velocity = rand.NextVector2(speed, speed),
Type = ParticleType.Enemy,
LengthMultiplier = 1
};
Color color = Color.Lerp(color1, color2, rand.NextFloat(0, 1));
GameplayScreen.ParticleManager.CreateParticle(GameplayScreen.ParticleTexture, Position, color, 190, 1.5f, state);
}
GameplayScreen.cue = GameplayScreen.soundBank.GetCue("explode");
GameplayScreen.cue.Apply3D(GameplayScreen.listener, GameplayScreen.emitter);
GameplayScreen.cue.Play();
}
public void WasShot()
{
hitpoints--;
if (hitpoints <= 0)
{
IsDestroyed = true;
PlayerStatus.AddPoints(200);
PlayerStatus.IncreaseMultiplier();
}
float hue = (float)((3 * GameplayScreen.GameTime.TotalGameTime.TotalSeconds) % 6);
Color color = Methods.HSVToColor(hue, 0.25f, 1);
const int numParticles = 100;
float startOffset = rand.NextFloat(0, MathHelper.TwoPi / numParticles);
for (int i = 0; i < numParticles; i++)
{
Vector2 sprayVel = Methods.FromPolar(MathHelper.TwoPi * i / numParticles + startOffset, rand.NextFloat(8, 16));
Vector2 pos = Position + 2f * sprayVel;
var state = new ParticleState()
{
Velocity = sprayVel,
LengthMultiplier = 1,
Type = ParticleType.IgnoreGravity
};
GameplayScreen.ParticleManager.CreateParticle(GameplayScreen.ParticleTexture, pos, color, 90, 1.5f, state);
}
// Sound.Explosion.Play(0.5f, rand.NextFloat(-0.2f, 0.2f), 0);
}