/// <summary>
/// InitializeParticle randomizes some properties for a particle, then
/// calls initialize on it. It can be overriden by subclasses if they
/// want to modify the way particles are created. For example,
/// SmokePlumeParticleSystem overrides this function make all particles
/// accelerate to the right, simulating wind.
/// </summary>
/// <param name="p">the particle to initialize</param>
/// <param name="where">the position on the screen that the particle should be
/// </param>
protected virtual void InitializeParticle(Particle p, Vector2 where)
{
// first, call PickRandomDirection to figure out which way the particle
// will be moving. velocity and acceleration's values will come from this.
Vector2 direction;
if (EmitterVelocity == Vector2.Zero)
{
direction = PickRandomDirection();
}
else
{
direction = EmitterVelocity += EmitterAcceleration;
}
// pick some random values for our particle
float velocity =
StarTrooperGame.RandomBetween(minInitialSpeed, maxInitialSpeed);
float acceleration =
StarTrooperGame.RandomBetween(minAcceleration, maxAcceleration);
float lifetime =
StarTrooperGame.RandomBetween(minLifetime, maxLifetime);
float scale =
StarTrooperGame.RandomBetween(minScale, maxScale);
float rotationSpeed =
StarTrooperGame.RandomBetween(minRotationSpeed, maxRotationSpeed);
// then initialize it with those random values. initialize will save those,
// and make sure it is marked as active.
p.Initialize(
where, velocity * direction, acceleration * direction,
lifetime, scale, rotationSpeed);
}
/// <summary>
/// The main entry point for the application.
/// </summary>
static void Main(string[] args)
{
using (StarTrooperGame game = new StarTrooperGame())
{
game.Run();
}
}
/// <summary>
/// InitializeParticle is overridden to add the appearance of wind.
/// </summary>
/// <param name="p">the particle to set up</param>
/// <param name="where">where the particle should be placed</param>
protected override void InitializeParticle(Particle p, Vector2 where)
{
base.InitializeParticle(p, where);
// the base is mostly good, but we want to simulate a little bit of wind
// heading to the right.
p.Acceleration.X += StarTrooperGame.RandomBetween(10, 50);
}
void TrooperFire()
{
// dynamically create a new sprite
Fire fire = (Fire)StarTrooperGame.Fire.Clone();
fire.Position = new Vector2(Position.X, Position.Y - 35);
fire.Velocity = new Vector2(0, -4);
StarTrooperGame.Add(fire); // set the fire sprite active
FireballLaunch(new Vector2(Position.X, Position.Y - 35), new Vector2(0, -40), new Vector2(0, -0.5f));
StarTrooperGame.Shoot.Play();
StarTrooperGame.shots++;
}
/// <summary>
/// PickRandomDirection is overriden so that we can make the particles always
/// move have an initial velocity pointing up.
/// </summary>
/// <returns>a random direction which points basically up.</returns>
protected override Vector2 PickRandomDirection()
{
// Point the particles somewhere between 80 and 100 degrees.
// tweak this to make the smoke have more or less spread.
float radians = StarTrooperGame.RandomBetween(
MathHelper.ToRadians(80), MathHelper.ToRadians(100));
Vector2 direction = Vector2.Zero;
// from the unit circle, cosine is the x coordinate and sine is the
// y coordinate. We're negating y because on the screen increasing y moves
// down the monitor.
direction.X = (float)Math.Cos(radians);
direction.Y = -(float)Math.Sin(radians);
return(direction);
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
LoadResources();
//Try and load any saved key mappings
FileManager.LoadKeyMappings();
//If no settings present or setting were unable to be loaded, use the defaults
if (!Input.InputMappings.SettingsSaved)
{
Input.Load_Defaults();
}
Shoot = Content.Load <SoundEffect>(@"Sounds\shoot");
Die = Content.Load <SoundEffect>(@"Sounds\die");
Music = Content.Load <SoundEffect>(@"Music\music");
BackgroundMusic = Music.CreateInstance();
BackgroundMusic.IsLooped = true;
BackgroundMusic.Play();
font = Content.Load <SpriteFont>(@"Fonts\SpriteFont1");
ScoreText = new Text2D(font);
ScoreText.Text = "Score: " + score.ToString();
ScoreText.Position = new Vector2(10, 10);
ScoreText.Color = Color.Red;
StarTrooperGame.Add(ScoreText);
ShotsText = new Text2D(font);
ShotsText.Text = "Shots: " + shots.ToString();
ShotsText.Position = new Vector2(150, 10);
ShotsText.Color = Color.Red;
StarTrooperGame.Add(ShotsText);
// TODO: use this.Content to load your game content here
}