public Particle(ParticleParameters particleParameters)
{
_particleParameters = particleParameters;
_step = 1f / _particleParameters.Duration;
Size = 16f;
Color = Color.Red;
}
public void Emit(ParticleParameters particleParameters, Vector2 position, Vector2 speed)
{
_particles.Add(new Particle(particleParameters)
{
Position = position, Speed = speed
});
}
public static void Detect(List <GameObject> gameObjects, Particles particles, ParticleParameters particleParameters)
{
for (int j = 0; j < gameObjects.Count; j++)
{
for (int i = 0; i < gameObjects.Count; i++)
{
if (i == j || i < 0 || j < 0)
{
continue;
}
var go1 = gameObjects[i];
var go2 = gameObjects[j];
float dx = go2.Position.X - go1.Position.X;
float dy = go2.Position.Y - go1.Position.Y;
float rr = go2.Size / 2 + go1.Size / 2;
float ol2 = rr * rr - dx * dx - dy * dy;
if (ol2 > 0)
{
if ((go1 is Rocket || go1 is PlasmaBullet) && (go2 is Asteroid || go2 is Ship))
{
for (int h = 0; h < 100; h++)
{
particles.Emit(particleParameters, (go1.Position + go2.Position) / 2f, 3f * Chaos.GetFloat() * Chaos.GetVector2());
}
gameObjects.RemoveAt(i--);
if (go2 is Asteroid)
{
go2.Size -= 20f;
if (go2.Size < 40f)
{
gameObjects.RemoveAt(j--);
}
}
continue;
}
if ((go1 is Ship) && go2 is SpeedBonus)
{
go1.Speed += new Vector2(10f * Maf.Sin(go1.Rotation), -10f * Maf.Cos(go1.Rotation));
gameObjects.RemoveAt(j--);
continue;
}
// ось столкновения и нормаль к ней
var nrm = new Vector2(dx, dy);
var tan = new Vector2(dy, -dx);
nrm.Normalize();
tan.Normalize();
// проекция скорости на ось столкновения (нормальная скорость)
float go1nrm = Vector2.Dot(go1.Speed, nrm);
float go2nrm = Vector2.Dot(go2.Speed, nrm);
// перераспределяем импульс между нормальными скоростями в соответствии с массами
float go1rsp = ((go1.Mass - go2.Mass) * go1nrm + 2f * go2.Mass * go2nrm) / (go1.Mass + go2.Mass);
float go2rsp = ((go2.Mass - go1.Mass) * go2nrm + 2f * go1.Mass * go1nrm) / (go1.Mass + go2.Mass);
// проекция скорости на нормаль к оси столкновения (тангенциальная скорость)
float go1tan = Vector2.Dot(go1.Speed, tan);
float go2tan = Vector2.Dot(go2.Speed, tan);
go1.Speed = nrm * go1rsp + tan * go1tan;
go2.Speed = nrm * go2rsp + tan * go2tan;
float gp = Maf.Sqrt(ol2);
go1.Position -= gp * go2.Mass / (go1.Mass + go2.Mass) * nrm;
go2.Position += gp * go1.Mass / (go1.Mass + go2.Mass) * nrm;
}
}
}
}
