protected override Particle GenerateNewParticle()
{
int index = _rand.Next(0, 3);
int ttl = _rand.Next(40, 80);
//Rotate the point based on the center of the sprite
// p = unrotated point, o = rotation origin
//p'x = cos(theta) * (px-ox) - sin(theta) * (py-oy) + ox
//p'y = sin(theta) * (px-ox) + cos(theta) * (py-oy) + oy
var origin = Entity.Body.Position + Entity.Render.Origin * Entity.Render.Scale;
var unrotatedposition = new Vector2(
Entity.Body.BoundingBox.X + Entity.Render.Origin.X * Entity.Render.Scale,
Entity.Body.BoundingBox.Bottom);
var angle = Entity.Body.Angle;
var position = new Vector2(
(float)(Math.Cos(angle) * (unrotatedposition.X - origin.X) - Math.Sin(angle) * (unrotatedposition.Y - origin.Y) + origin.X),
(float)(Math.Sin(angle) * (unrotatedposition.X - origin.X) + Math.Cos(angle) * (unrotatedposition.Y - origin.Y) + origin.Y)
);
FadeParticle p = new FadeParticle(index, position, 10, ttl, this);
p.Body.Angle = (float)_rand.NextDouble() / 2 - .25f;
p.Physics.Thrust((float)_rand.NextDouble() + .1f);
p.Render.Layer = .5f;
p.Render.Color = Colors[_rand.Next(0, Colors.Count)];
return p;
}
public override void Emit(int amount)
{
var random = new Random(DateTime.Now.Millisecond);
float pislice = MathHelper.TwoPi / amount;
for (int i = 0; i < amount; i++)
{
int index = random.Next(0, 3);
float angle = pislice * i;
Vector2 position = Entity.Body.Position;
var p = new FadeParticle(index, position, 40, this)
{
Body = {Angle = angle},
TimeToLive = 50 + Entity.Health.HitPoints*20,
Physics = {Drag = 0.99f}
};
p.Physics.Thrust(random.Next(1, 4));
p.Render.Scale = (float)random.NextDouble() + .5f;
Entity.AddEntity(p);
}
}
public override void Emit(int amount)
{
var random = new Random(DateTime.Now.Millisecond);
var pislice = MathHelper.TwoPi / amount;
for (var i = 0; i < amount; i++)
{
var index = random.Next(0, 3);
var angle = pislice * i;
var position = Entity.Body.Position;
var p = new FadeParticle(index, position, 40, this)
{
Body = {Angle = angle - (float) random.NextDouble()},
Physics = {AngularVelocity = (float) random.NextDouble()*.5f - .1f},
TimeToLive = 200
};
p.Physics.Drag = 0.99f;
p.Physics.Thrust((float)random.NextDouble() * 2.0f + 1f);
p.Render.Scale = (float)random.NextDouble() + .75f;
Entity.AddEntity(p);
}
}
protected override Particle GenerateNewParticle()
{
int index = _rand.Next(0, 3);
Particle p = new FadeParticle(index, Entity.Body.Position, 40, this);
p.TimeToLive = 100;
float angle = (float)_rand.NextDouble() * MathHelper.PiOver2;
var anglev = (float)((_rand.NextDouble() - .5f) * 1.25f);
p.Body.Angle = angle - anglev;
p.Physics.Thrust((float)_rand.NextDouble() * 2);
p.Render.Scale = .25f * Entity.Health.HitPoints + .75f;
return p;
}
