private void DoGuns(Body body, Body enemy, Key fire)
{
//this method requires a deep understanding of delegates and events. ENJOY :P
Scalar projectileSpeed = 500;
Scalar projectileRadius = 3;
Scalar projectileMass = 3;
BoundingRectangle rect;
Matrix2x3 ident = Matrix2x3.Identity;
body.Shape.CalcBoundingRectangle(ref ident, out rect);
DateTime lastFire = DateTime.Now;
Scalar distance = rect.Max.X + projectileRadius * 2;
EventHandler <KeyboardEventArgs> keyDown = delegate(object sender, KeyboardEventArgs e)
{
DateTime now = DateTime.Now;
if (e.Key == fire &&
!body.Lifetime.IsExpired &&
now.Subtract(lastFire).TotalSeconds > .3)
{
lastFire = now;
Vector2D normal = body.Matrices.ToWorldNormal * Vector2D.XAxis;
Vector2D position = new Vector2D(body.Matrices.ToWorld.m02, body.Matrices.ToWorld.m12) + (normal * distance);
Vector2D offset = normal.LeftHandNormal * 3 * projectileRadius;
Body projectile1 = DemoHelper.AddCircle(DemoInfo, projectileRadius, 8, projectileMass, new ALVector2D(0, position + offset));
Body projectile2 = DemoHelper.AddCircle(DemoInfo, projectileRadius, 8, projectileMass, new ALVector2D(0, position - offset));
projectile1.Lifetime.MaxAge = 5;
projectile2.Lifetime.MaxAge = 5;
Vector2D velocity = normal * projectileSpeed;
body.State.Velocity.Linear -= (projectileMass * 2 * velocity) * body.Mass.MassInv;
projectile1.State.Velocity.Linear = velocity + body.State.Velocity.Linear;
projectile2.State.Velocity.Linear = velocity + body.State.Velocity.Linear;
EventHandler <CollisionEventArgs> collided = delegate(object sender1, CollisionEventArgs e1)
{
Body projectile = (Body)sender1;
projectile.Lifetime.IsExpired = true;
bool isHit = e1.Other == enemy || e1.Other == body;
List <Body> particles = DemoHelper.AddParticles(
DemoInfo,
projectile.State.Position.Linear,
projectile.State.Velocity.Linear,
(isHit) ? (200) : (10));
if (isHit && !e1.Other.Lifetime.IsExpired)
{
ExplosionLogic explosionLogic = new ExplosionLogic(
e1.Other.State.Position.Linear,
e1.Other.State.Velocity.Linear,
9000, .1f, e1.Other.Mass.Mass,
new Lifespan(.5f));
Scene.Engine.AddLogic(explosionLogic);
e1.Other.Lifetime.IsExpired = true;
particles[0].Removed += delegate(object sender2, RemovedEventArgs e2)
{
if (particles[0].Lifetime.IsExpired)
{
e1.Other.State.Velocity = ALVector2D.Zero;
e1.Other.State.Position = new ALVector2D(DemoHelper.NextScalar(-600, 900), DemoHelper.NextScalar(-600, 900), DemoHelper.NextScalar(-600, 900));
e1.Other.ApplyPosition();
e1.Other.Lifetime.IsExpired = false;
Scene.AddGraphic((BodyGraphic)e1.Other.Tag);
}
};
}
else if (e1.Other.Shape is CircleShape &&
!e1.Other.IgnoresCollisionResponse)
{
e1.Other.Lifetime.IsExpired = true;
}
};
projectile1.Collided += collided;
projectile2.Collided += collided;
}
};
Events.KeyboardDown += keyDown;
dispose += delegate()
{
Events.KeyboardDown -= keyDown;
};
}
