// public methods
public void Update()
{
if (random.NextDouble() > runningGenerationRate)
{
runningGenerationRate += 0.0002;
return;
}
this.runningGenerationRate = this.GenerationRate;
float w = this.scene.Width;
float h = this.scene.Height;
int side = random.Next(4);
int pos1 = random.Next(10, 90);
int pos2 = random.Next(10, 90);
LaserEntity laser = null;
switch (side)
{
case 0: // top
laser = new LaserEntity(null, pos1 * w / 100.0f, 0, pos2 * w / 100.0f, h);
break;
case 1: // bottom
laser = new LaserEntity(null, pos1 * w / 100.0f, h, pos2 * w / 100.0f, 0);
break;
case 2: // left
laser = new LaserEntity(null, 0, pos1 * h / 100.0f, w, pos2 * h / 100.0f);
break;
case 3: // right
laser = new LaserEntity(null, w, pos1 * h / 100.0f, 0, pos2 * h / 100.0f);
break;
}
this.scene.AddEntity(laser);
}
private void Update_Play()
{
float halfAlienSize = alienSize / 2;
// update alien
var alien = NamedEntities["alien"];
alien.ConstrainInRect(0, 0, this.Width, this.Height);
// update bullet entities
foreach (Entity e in this.Entities)
{
// update speed for homing bullet
if (e.ObjectType == Program.GameObjectType.HomingBullet &&
(long)e.Tag > Program.CurrentTime)
{
float sp = e.Motion.Speed.Norm();
Vector u = Alien.Position - e.Position;
u = u.SafeNormalize();
Vector v = e.Motion.Speed.SafeNormalize();
e.Motion.Speed = (u * attractorFactor + v * (1 - attractorFactor)).SafeNormalize() * sp;
}
// update bullets
if (e.ObjectType == Program.GameObjectType.Bullet ||
e.ObjectType == Program.GameObjectType.HomingBullet)
{
SpriteEntity se = e as SpriteEntity;
// remove off screen bullets
if (!se.IsInRect(-50, -50, this.Width + 100, this.Height + 100))
{
se.CanRemove = true;
continue;
}
float dis = se.Position.DistanceFrom(this.Alien.Position);
if (dis < halfAlienSize)
{
// goto Failed state
state = State.Failed;
}
else if (se.State == (int)Program.BulletState.Normal && dis < halfAlienSize + this.closeDistance)
{
// increase score if bullet is close enough
score++;
se.State = (int)Program.BulletState.Approached;
/*
* if (e.ObjectType == Program.GameObjectType.Bullet)
* se.Bitmaps = this.NormalBulletGenerator.ApproachedSprites;
* if (e.ObjectType == Program.GameObjectType.HomingBullet)
* se.Bitmaps = this.HomingBulletGenerator.ApproachedSprites;
*/
}
}
if (e.ObjectType == Program.GameObjectType.Laser)
{
LaserEntity laser = e as LaserEntity;
float dis = laser.DistanceTo(this.Alien.Position);
if (dis < halfAlienSize)
{
// goto Failed state
state = State.Failed;
}
else if (dis < halfAlienSize + this.closeDistance)
{
// increase score if bullet is close enough
score++;
var p1 = new System.Windows.Media.MediaPlayer();
p1.Open(new System.Uri(AppDomain.CurrentDomain.BaseDirectory + "wav/click.wav"));
p1.Play();
}
}
if (e.ObjectType == Program.GameObjectType.Bomb)
{
BombEntity laser = e as BombEntity;
float dis = laser.DistanceTo(this.Alien.Position);
if (dis < halfAlienSize)
{
// goto Failed state
state = State.Failed;
}
else if (dis < halfAlienSize + this.closeDistance)
{
// increase score if bullet is close enough
score++;
}
}
}
// make new bullet randomly
this.NormalBulletGenerator.Update();
this.HomingBulletGenerator.Update();
this.LaserGenerator.Update();
this.BombGenerator.Update();
// update time and score text entitye
int remainingTime = this.levelCountdown - (int)(Program.CurrentTime - this.PlayStartTime) / 1000;
TextEntity cdt = this.NamedEntities["countdown_text"] as TextEntity;
cdt.Text = remainingTime.ToString();
TextEntity st = this.NamedEntities["score_text"] as TextEntity;
st.Text = this.score.ToString("0000");
// if time up, goto intermission scene
if (remainingTime == 0)
{
// goto Completed state
state = State.Completed;
}
}