public override void Update(GameTime gameTime)
{
// update the orientation each frame
if (velocity.LengthSquared() > 0)
{
orientation = velocity.ToAngle();
}
// update position of bullet each frame using pixel/second
position += velocity * (float)gameTime.ElapsedGameTime.TotalSeconds;
// if bullet moves out of the screen destroy it
if (!GameRoot.Viewport.Bounds.Contains(position.ToPoint()))
{
isExpired = true;
ParticleState state;
for (int i = 0; i < 15; i++)
{
state = new ParticleState()
{
velocity = rand.NextVector2(0, 150),
type = ParticleType.Bullet,
lengthMultiplier = 1
};
GameRoot.ParticleManager.CreateParticle(Art.LineParticle, position, Color.LightBlue, 0.6f, 1, state);
}
}
}
/// <summary>
/// Kill the enemy
/// </summary>
public void WasShot()
{
// applying variation to pitch so that the explosion sound is a bit different every time
Sound.Explosion.Play(0.5f, rand.NextFloat(-0.2f, 0.2f), 0);
isExpired = true;
float hue1 = rand.NextFloat(0, 6);
float hue2 = (hue1 + rand.NextFloat(0, 2)) % 6f;
Color color1 = ColorUtil.HSVToColor(hue1, 0.5f, 1);
Color color2 = ColorUtil.HSVToColor(hue2, 0.5f, 1);
for (int i = 0; i < 120; i++)
{
// 10 step speed variation
float speed = 400f * (1f - 1 / rand.NextFloat(1f, 10f));
var state = new ParticleState()
{
velocity = rand.NextVector2(speed, speed),
type = ParticleType.Enemy,
lengthMultiplier = 1
};
Color color = Color.Lerp(color1, color2, rand.NextFloat(0, 1));
GameRoot.ParticleManager.CreateParticle(Art.LineParticle, position, color, 2f, 1.5f, state);
}
}
public void WasShot()
{
hitpoints--;
if (hitpoints <= 0)
{
isExpired = true;
}
float hue = (float)((3 * GameRoot.GameTime.TotalGameTime.TotalSeconds) % 6);
Color color = ColorUtil.HSVToColor(hue, 0.25f, 1);
const int numParticles = 150;
float startOffset = rand.NextFloat(0, MathHelper.TwoPi / numParticles);
for (int i = 0; i < numParticles; i++)
{
Vector2 sprayVel = MathUtil.FromPolar(MathHelper.TwoPi * i / numParticles + startOffset, rand.NextFloat(8, 16));
Vector2 pos = position + 2f * sprayVel;
var state = new ParticleState()
{
velocity = sprayVel * 90,
lengthMultiplier = 1,
type = ParticleType.IgnoreGravity
};
GameRoot.ParticleManager.CreateParticle(Art.LineParticle, pos, color, 2.5f, 1.5f, state);
}
}
public void Kill()
{
PlayerStatus.RemoveLife();
if (!PlayerStatus.IsGameOver)
{
timeUntilRespawn = 3;
}
else
{
PlayerStatus.EndSession();
}
// Particles
Color yellow = new Color(0.8f, 0.8f, 0.4f);
for (int i = 0; i < 1200; i++)
{
float speed = 700 * (1f - 1 / rand.NextFloat(1f, 10f));
Color color = Color.Lerp(Color.White, yellow, rand.NextFloat(0, 1));
var state = new ParticleState()
{
velocity = rand.NextVector2(speed, speed),
type = ParticleType.None,
lengthMultiplier = 1
};
GameRoot.ParticleManager.CreateParticle(Art.LineParticle, position, color, 3, 1.5f, state);
}
}
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(GameTime gameTime)
{
var entities = EntityManager.GetNearbyEntities(position, areaOfEffectRadius);
foreach (Entity entity in entities)
{
if (entity is Enemy && !(entity as Enemy).IsActive)
{
continue;
}
if (entity is Bullet)
{
entity.velocity += (entity.position - position).ScaleTo(12f);
}
else
{
var dPos = position - entity.position;
var length = dPos.Length();
entity.velocity += dPos.ScaleTo(MathHelper.Lerp(150f, 0, length / 250f));
}
}
// The black holes spray some orbiting particles. The spray toggles on and off every quarter second.
if ((GameRoot.GameTime.TotalGameTime.Milliseconds / 250) % 2 == 0)
{
Vector2 sprayVel = MathUtil.FromPolar(sprayAngle, rand.NextFloat(12, 15));
Color color = ColorUtil.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
};
GameRoot.ParticleManager.CreateParticle(Art.LineParticle, pos, color, 3, 1.5f, state);
}
// rotate the spray direction
sprayAngle -= MathHelper.TwoPi / 50f;
}
