public bool DetectCollision(GameStagePlay stage)
{
if (this.Status == SaucerStatus.Active)
{
Missile missile = stage.Missile;
if (missile.IsActive &&
missile.YCenter >= this.YCenter &&
missile.YCenter <= this.YCenter + 1 &&
missile.XCenter >= this.XCenter - 1 &&
missile.XCenter <= this.XCenter + 2)
{
//got it!
this.Status = SaucerStatus.StartExplosion;
missile.IsActive = false;
//decide score, then accumulate it
this.PromisedScore = 10 * (1 + stage.Context.Rnd.Next(9));
stage.Context.CurrentScore += this.PromisedScore;
return(true);
}
}
return(false);
}
public bool DetectCollision(GameStagePlay stage)
{
int xoffs, yoffs;
//check missile collision
Missile missile = stage.Missile;
if (missile.IsActive &&
(xoffs = (missile.XCenter - this.XLeft)) >= 0 &&
xoffs < BarrierWidth &&
(yoffs = (missile.YCenter - this.YTop)) >= 0 &&
yoffs < BarrierHeight)
{
int mask = 1 << (yoffs * BarrierWidth + xoffs);
if ((this.BricksAlive & mask) != 0)
{
//got it!
this.ExplodeBricksAroundPoint(xoffs, yoffs);
this.ExplodeBricksAroundPoint(xoffs - 1, yoffs);
this.ExplodeBricksAroundPoint(xoffs + 1, yoffs);
this.ExplodeBricksAroundPoint(xoffs, yoffs - 1);
this.ExplodeBricksAroundPoint(xoffs, yoffs + 1);
missile.IsActive = false;
return(true);
}
}
//check bombs collision
for (int i = stage.Bombs.Length - 1; i >= 0; i--)
{
Bomb bomb;
if ((bomb = stage.Bombs[i]).IsActive &&
(xoffs = (bomb.XCenter - this.XLeft)) >= 0 &&
xoffs < BarrierWidth &&
(yoffs = (bomb.YCenter - this.YTop)) >= 0 &&
yoffs < BarrierHeight)
{
int mask = 1 << (yoffs * BarrierWidth + xoffs);
if ((this.BricksAlive & mask) != 0)
{
//got it!
this.ExplodeBricksAroundPoint(xoffs, yoffs);
this.ExplodeBricksAroundPoint(xoffs - 1, yoffs);
this.ExplodeBricksAroundPoint(xoffs + 1, yoffs);
this.ExplodeBricksAroundPoint(xoffs, yoffs - 1);
this.ExplodeBricksAroundPoint(xoffs, yoffs + 1);
bomb.IsActive = false;
return(true);
}
}
}
return(false);
}
public void Update(GameStagePlay stage)
{
if (this.IsActive)
{
this.YCenter--;
if (YCenter < 0)
{
//failed
this.IsActive = false;
}
}
}
public void Update(GameStagePlay stage)
{
if (this.IsActive &&
stage.Context.IsEvenClock)
{
this.YCenter++;
if (YCenter > stage.ViewportBottom)
{
//failed
this.IsActive = false;
}
}
}
public override bool DetectCollision(GameStagePlay stage)
{
if (this.IsAlive)
{
Missile missile = stage.Missile;
if (missile.IsActive)
{
switch (this.Status)
{
case AlienStatus.Walk1:
if (missile.YCenter <= this.YCenter &&
missile.YCenter >= this.YCenter - 1 &&
missile.XCenter >= this.XCenter - 1 &&
missile.XCenter <= this.XCenter + 1)
{
//got it!
this.IsAlive = false;
this.Status = AlienStatus.StartExplosion;
missile.IsActive = false;
stage.Context.CurrentScore += Score;
return(true);
}
break;
case AlienStatus.Walk2:
if (missile.YCenter <= this.YCenter &&
missile.YCenter >= this.YCenter - 1 &&
missile.XCenter == this.XCenter)
{
//got it!
this.IsAlive = false;
this.Status = AlienStatus.StartExplosion;
missile.IsActive = false;
stage.Context.CurrentScore += Score;
return(true);
}
break;
}
}
}
return(false);
}
public bool DetectCollision(GameStagePlay stage)
{
if (this.IsAlive)
{
foreach (Bomb bomb in stage.Bombs)
{
if (bomb.IsActive &&
bomb.YCenter <= this.YCenter &&
bomb.YCenter >= this.YCenter - 1 &&
bomb.XCenter >= this.XCenter - 1 &&
bomb.XCenter <= this.XCenter + 1)
{
//got it!
this.IsAlive = false;
this.Status = ShipStatus.StartExplosion;
bomb.IsActive = false;
return(true);
}
}
}
return(false);
}
public override bool DetectCollision(GameStagePlay stage)
{
if (this.IsAlive)
{
Missile missile = stage.Missile;
if (missile.IsActive &&
missile.YCenter <= this.YCenter &&
missile.YCenter >= this.YCenter - 1 &&
missile.XCenter >= this.XCenter - 1 &&
missile.XCenter <= this.XCenter + 2)
{
//got it!
this.IsAlive = false;
this.Status = AlienStatus.StartExplosion;
missile.IsActive = false;
stage.Context.CurrentScore += Score;
return true;
}
}
return false;
}
public void Update(GameStagePlay stage)
{
switch (this.Status)
{
case SaucerStatus.Inactive:
double hash;
if ((hash = stage.Context.Rnd.NextDouble()) < Probability)
{
if (hash < Probability / 2)
{
//will flight from left to right
this.XCenter = -8;
this._xLimit = stage.ViewportRight + 4;
}
else
{
//will flight from right to left
this.XCenter = stage.ViewportRight + 4;
this._xLimit = -8;
}
this.Status = SaucerStatus.Active;
}
break;
case SaucerStatus.Active:
if (stage.Context.IsEvenClock)
{
if (this.XCenter < this._xLimit)
{
this.XCenter++;
}
else
{
this.XCenter--;
}
if (this.XCenter == this._xLimit)
{
//sauce gone off screen being not hit
this.Status = SaucerStatus.Inactive;
}
else
{
//play releated sound
stage.Context.PlaySound(stage.Context.SoundSaucer);
}
}
break;
case SaucerStatus.StartExplosion:
this.Status = SaucerStatus.ExplodeExpand;
this._explosionClock = ExplosionTime;
//play related sound
stage.Context.PlaySound(stage.Context.SoundShipDestroyed);
break;
case SaucerStatus.ExplodeExpand:
if (--this._explosionClock == 0)
{
this.Status = SaucerStatus.ExplodeMax;
this._explosionClock = ExplosionTime;
}
break;
case SaucerStatus.ExplodeMax:
if (--this._explosionClock == 0)
{
this.Status = SaucerStatus.ExplodeCollapse;
this._explosionClock = ExplosionTime;
}
break;
case SaucerStatus.ExplodeCollapse:
if (--this._explosionClock == 0)
{
this.Status = SaucerStatus.Inactive;
stage.ShowSaucerWorth();
}
break;
}
}
public void Update(GameStagePlay stage)
{
if (this.IsAlive)
{
//time to move aliens?
if (stage.ShiftAliens)
{
//manage position
switch (stage.CurrentAlienDir)
{
case AlienDirection.Rightward:
this.XCenter++;
if (this.XCenter == (stage.ViewportRight - 2))
{
stage.NextAlienDir = AlienDirection.RightEdge;
}
break;
case AlienDirection.RightEdge:
this.YCenter++;
stage.NextAlienDir = (this.YCenter == stage.ViewportBottom)
? AlienDirection.GroundReached
: AlienDirection.Leftward;
break;
case AlienDirection.Leftward:
this.XCenter--;
if (this.XCenter == 1)
{
stage.NextAlienDir = AlienDirection.LeftEdge;
}
break;
case AlienDirection.LeftEdge:
this.YCenter++;
stage.NextAlienDir = (this.YCenter == stage.ViewportBottom)
? AlienDirection.GroundReached
: AlienDirection.Rightward;
break;
}
//update status
this.Status = this.Status == AlienStatus.Walk1
? AlienStatus.Walk2
: AlienStatus.Walk1;
//may drop a bomb?
if (this.AlienBelow == null ||
this.AlienBelow.Status == AlienStatus.Dead)
{
//consider dropping one
Bomb bomb;
if (stage.Context.Rnd.NextDouble() > 0.8 &&
(bomb = stage.GetBombSlot()) != null)
{
//drop it!
bomb.XCenter = this.XCenter;
bomb.YCenter = this.YCenter;
bomb.IsActive = true;
}
}
}
}
else if (this.Status != AlienStatus.Dead)
{
switch (this.Status)
{
case AlienStatus.StartExplosion:
this.Status = AlienStatus.ExplodeExpand;
this._explosionClock = ExplosionTime;
//play related sound
stage.Context.PlaySound(stage.Context.SoundAlienDestroyed);
break;
case AlienStatus.ExplodeExpand:
if (--this._explosionClock == 0)
{
this.Status = AlienStatus.ExplodeMax;
this._explosionClock = ExplosionTime;
}
break;
case AlienStatus.ExplodeMax:
if (--this._explosionClock == 0)
{
this.Status = AlienStatus.ExplodeCollapse;
this._explosionClock = ExplosionTime;
}
break;
case AlienStatus.ExplodeCollapse:
if (--this._explosionClock == 0)
{
stage.DecreaseAliens();
this.Status = AlienStatus.Dead;
}
break;
}
}
}
public abstract bool DetectCollision(GameStagePlay stage);
public void Update(GameStagePlay stage)
{
var context = stage.Context;
if (this.IsAlive)
{
if (context.IsEvenClock)
{
if (context.LeftButton)
{
if (this.XCenter > 1)
{
this.XCenter--;
}
}
else if (context.RightButton)
{
if (this.XCenter < (stage.ViewportRight - 1))
{
this.XCenter++;
}
}
else if (context.FireButton)
{
//check missile availability
if (stage.Missile.IsActive == false)
{
//fire it!
stage.Missile.XCenter = this.XCenter;
stage.Missile.YCenter = this.YCenter - 1;
stage.Missile.IsActive = true;
}
}
}
}
else if (this.Status != ShipStatus.Dead)
{
switch (this.Status)
{
case ShipStatus.StartExplosion:
this.Status = ShipStatus.ExplodeExpand;
this._explosionClock = ExplosionTime;
//play related sound
context.PlaySound(context.SoundShipDestroyed);
break;
case ShipStatus.ExplodeExpand:
if (--this._explosionClock == 0)
{
this.Status = ShipStatus.ExplodeMax;
this._explosionClock = ExplosionTime;
}
break;
case ShipStatus.ExplodeMax:
if (--this._explosionClock == 0)
{
this.Status = ShipStatus.ExplodeCollapse;
this._explosionClock = ExplosionTime;
}
break;
case ShipStatus.ExplodeCollapse:
if (--this._explosionClock == 0)
{
this.IsAlive = stage.DecreaseShips();
this.Status = this.IsAlive
? ShipStatus.Alive
: ShipStatus.Dead;
}
break;
}
}
}
public override GameStageBase OnCompose(CompositionTargetBase target)
{
GameStageBase result = null;
//the game begins on any button pressed
if (this.Context.FireButton ||
this.Context.RightButton ||
this.Context.LeftButton)
{
if (this.Context.Status == GameStatus.Idle)
{
result = new GameStagePlay(this.Context);
}
}
else if (this.Context.Status == GameStatus.RegComplete)
{
//this prevents the game to begin when
//a button is still pressed since a prev stage
this.Context.Status = GameStatus.Idle;
}
bool flasher = (this.Context.Clock & 8) != 0;
if (this._frame == 0)
{
this._posT0 = new Point(34, 4);
this._posT1 = new Point(40, 4);
this._posAlien = new Point(-25, 4);
}
if (this._frame < 24)
{
target.DrawString("O", AlienFont.Instance, Brushes.Lime, _posT0);
target.DrawString(Title1, Fonts.Fixed5x7, Brushes.Lime, _posT1);
_posT0.X--;
_posT1.X--;
}
else if (this._frame < 24)
{
target.DrawString("O", AlienFont.Instance, Brushes.Lime, _posT0);
target.DrawString(Title1, Fonts.Fixed5x7, Brushes.Lime, _posT1);
}
else if (this._frame < 24 + 8)
{
target.DrawString("O", AlienFont.Instance, Brushes.Lime, _posT0);
target.DrawString(Title1, Fonts.Fixed5x7, Brushes.Lime, _posT1);
_posT0.X++;
_posT1.X++;
}
else if (this._frame < 32 + 34)
{
string alien = string.Empty + (char)(0x50 + (this._frame & 1));
target.DrawString(alien, AlienFont.Instance, Brushes.Yellow, _posAlien);
target.DrawString("O", AlienFont.Instance, Brushes.Lime, _posT0);
target.DrawString(Title1, Fonts.Fixed5x7, Brushes.Lime, _posT1);
_posAlien.X++;
}
else if (this._frame < 66 + 34)
{
string alien = string.Empty + (char)(0x50 + (this._frame & 1));
target.DrawString(alien, AlienFont.Instance, Brushes.Yellow, _posAlien);
target.DrawString("O", AlienFont.Instance, Brushes.Lime, _posT0);
target.DrawString(Title1, Fonts.Fixed5x7, Brushes.Lime, _posT1);
_posAlien.X--;
_posT0.X--;
}
else if (this._frame < 100 + 34)
{
string alien = string.Empty + (char)(0x50 + (this._frame & 1));
target.DrawString(alien, AlienFont.Instance, Brushes.Yellow, _posAlien);
target.DrawString("N", AlienFont.Instance, Brushes.Lime, _posT0);
target.DrawString(Title1, Fonts.Fixed5x7, Brushes.Lime, _posT1);
_posAlien.X++;
_posT0.X++;
}
else if (this._frame < 134 + 100)
{
string alien = string.Empty + (char)(0x50 + (this._frame & 1));
target.DrawString(alien, AlienFont.Instance, Brushes.Yellow, _posAlien);
target.DrawString("N", AlienFont.Instance, Brushes.Lime, _posT0);
target.DrawString(Title1, Fonts.Fixed5x7, Brushes.Lime, _posT1);
_posAlien.X--;
_posT0.X--;
_posT1.X--;
}
else if (this._frame < 234 + 60)
{
if (this._frame == 234)
{
this._posT0.X = 15;
this._posT0.Y = 0;
this._posT1.X = -15;
this._posT1.Y = 8;
}
//alien #2 is wider and yields less points
string alien2 = flasher ? "RS" : "TU";
target.DrawString(alien2, AlienFont.Instance, Brushes.Yellow, this._posT0);
target.DrawString(AlienLarge.Score + "p", Fonts.Fixed5x7, Brushes.Lime, this._posT0.X + 12, this._posT0.Y);
//alien #1 worth more
string alien1 = flasher ? "P" : "Q";
target.DrawString(alien1, AlienFont.Instance, Brushes.Yellow, this._posT1.X + 19, this._posT1.Y);
target.DrawString(AlienSmall.Score + "p", Fonts.Fixed5x7, Brushes.Lime, this._posT1.X, this._posT1.Y + 1);
if (this.Context.IsEvenClock)
{
this._posT0.X--;
this._posT1.X++;
}
}
else if (this._frame < 294 + 80)
{
if (flasher)
{
target.DrawString("In ert", Fonts.Fixed5x7, Brushes.Lime, new Point(-1, 0));
target.DrawString("$", Fonts.Fixed5x7, Brushes.Red, new Point(11, 0));
target.DrawString("coin", Fonts.Fixed5x7, Brushes.Yellow, new Point(4, 9));
}
}
else
{
this._frame = -1;
}
this._frame++;
return(result);
}