public virtual void MoveBy_Left(double d, ThingList targetThings)
{
position.X += d;
foreach (Thing target in targetThings)
{
if (!target.Shootable)
{
continue;
}
if (Left < target.Right && target.Left < Right && Top < target.Bottom && target.Top < Bottom)
{
if (position.X > target.Center.X)
{
Left = target.Right;
}
target.Damage(damage);
Hit();
return;
}
}
int topRow = TopRow;
int bottomRow = BottomRow;
int leftCol = LeftCol;
Map map = game.Map;
if (map.IsObstacle(topRow, leftCol) || map.IsObstacle(bottomRow, leftCol))
{
Left = (leftCol + 1) * Settings.BLOCK_WDITH;
Hit();
}
}
public virtual void MoveBy_Down(double d, ThingList targetThings)
{
position.Y += d;
foreach (Thing target in targetThings)
{
if (!target.Shootable)
{
continue;
}
if (Left < target.Right && target.Left < Right && Top < target.Bottom && target.Top < Bottom)
{
if (position.Y < target.Center.Y)
{
Bottom = target.Top;
}
target.Damage(damage);
Hit();
return;
}
}
int leftCol = LeftCol;
int rightCol = RightCol;
int bottomRow = BottomRow;
Map map = game.Map;
if (map.IsObstacle(bottomRow, leftCol) || map.IsObstacle(bottomRow, rightCol))
{
Bottom = bottomRow * Settings.BLOCK_WDITH;
Hit();
}
}
public GameScene(int numRows, int numCols)
{
random = new Random();
map = new Map(this, numRows, numCols);
player = null;
camera = Vector.Zero;
players = new ThingList();
enemies = new ThingList();
enemyAddList = new ThingList();
playerBullets = new BulletList();
enemyBullets = new BulletList();
items = new ThingList();
door = null;
particles = new ParticleList();
particleAddList = new ParticleList();
quakeRadius = 0;
quakeVector = Vector.Zero;
flash = 0;
numTicks = 0;
cleared = false;
clearTimer = 0;
gameoverTimer = 0;
gameover = false;
backgroundParticles = new ParticleList();
audio = null;
}
public override void Tick(ThingList targetThings)
{
stateCount++;
if (stateCount < timer)
{
velocity = 0.0625 * (waitPos - position);
}
if (stateCount == timer)
{
if (facePlayer)
{
direction = Math.Atan2(game.Player.Center.Y - position.Y, game.Player.Center.X - position.X);
velocity = 8 * new Vector(Math.Cos(direction), Math.Sin(direction));
}
else
{
direction = Math.PI / 2;
velocity = new Vector(0, 8);
}
base.Tick(targetThings);
base.Tick(targetThings);
}
base.Tick(targetThings);
base.Tick(targetThings);
base.Tick(targetThings);
base.Tick(targetThings);
}
public void Tick(ThingList targetThings)
{
foreach (Bullet bullet in bullets)
{
bullet.Tick(targetThings);
}
}
public void Tick(ThingList targetThings)
{
foreach (Bullet bullet in bullets)
{
bullet.Tick(targetThings);
}
}
public override void Tick(ThingList targetThings)
{
if (life > 0)
{
life--;
}
else
{
Hit();
return;
}
double minRange = double.MaxValue;
Thing target = null;
foreach (Thing thing in targetThings)
{
double dx = thing.Center.X - position.X;
double dy = thing.Center.Y - position.Y;
double range = dx * dx + dy * dy;
if (range < minRange)
{
minRange = range;
target = thing;
}
}
if (target != null)
{
double dx = target.Center.X - position.X;
double dy = target.Center.Y - position.Y;
double dr = (Math.Atan2(dy, dx) / Math.PI * 180) - direction;
dr = (dr + 180) % 360;
if (dr < 0) dr += 360;
dr -= 180;
if (Math.Abs(dr) < maxRotAngle * speed)
{
direction += dr;
}
else
{
direction += maxRotAngle * speed * Math.Sign(dr);
}
}
if (speed < MAX_SPEED)
{
speed += 0.5;
}
velocity = speed * new Vector(Math.Cos(direction / 180.0 * Math.PI), Math.Sin(direction / 180.0 * Math.PI));
double a = 2 * Math.PI * game.Random.NextDouble();
if (animation % 2 == 0)
{
game.AddParticle(new PlayerRocketTail(game, position, 0.125 * new Vector(Math.Cos(a), Math.Sin(a))));
}
animation = (animation + 1) % 8;
base.Tick(targetThings);
}
public GameScene(int numRows, int numCols)
{
random = new Random();
map = new Map(this, numRows, numCols);
player = null;
camera = Vector.Zero;
players = new ThingList();
enemies = new ThingList();
enemyAddList = new ThingList();
playerBullets = new BulletList();
enemyBullets = new BulletList();
items = new ThingList();
door = null;
particles = new ParticleList();
particleAddList = new ParticleList();
quakeRadius = 0;
quakeVector = Vector.Zero;
flash = 0;
numTicks = 0;
cleared = false;
clearTimer = 0;
gameoverTimer = 0;
gameover = false;
backgroundParticles = new ParticleList();
audio = null;
}
public override void Tick(ThingList targetThings)
{
stateCount++;
if (stateCount < timer)
{
velocity = 0.0625 * (waitPos - position);
}
if (stateCount == timer)
{
if (facePlayer)
{
direction = Math.Atan2(game.Player.Center.Y - position.Y, game.Player.Center.X - position.X);
velocity = 8 * new Vector(Math.Cos(direction), Math.Sin(direction));
}
else
{
direction = Math.PI / 2;
velocity = new Vector(0, 8);
}
base.Tick(targetThings);
base.Tick(targetThings);
}
base.Tick(targetThings);
base.Tick(targetThings);
base.Tick(targetThings);
base.Tick(targetThings);
}
public virtual void MoveBy(Vector d, ThingList targetThings)
{
if (removed)
{
return;
}
MoveBy_Horizontal(d.X, targetThings);
MoveBy_Vertical(d.Y, targetThings);
}
public override void Tick(ThingList targetThings)
{
velocity.Y += 0.125;
if (velocity.Y > 2)
{
velocity.Y = 2;
}
base.Tick(targetThings);
}
public override void Tick(ThingList targetThings)
{
velocity.Y += 0.125;
if (velocity.Y > 16)
{
velocity.Y = 16;
}
base.Tick(targetThings);
}
public virtual void MoveBy_Vertical(double d, ThingList targetThings)
{
if (d < 0)
{
MoveBy_Up(d, targetThings);
}
else if (d > 0)
{
MoveBy_Down(d, targetThings);
}
}
public override void Tick(ThingList targetThings)
{
velocity.Y += 0.0625;
if (velocity.Y > 16)
{
velocity.Y = 16;
}
base.Tick(targetThings);
}
public virtual void MoveBy_Horizontal(double d, ThingList targetThings)
{
if (d < 0)
{
MoveBy_Left(d, targetThings);
}
else if (d > 0)
{
MoveBy_Right(d, targetThings);
}
}
public override void MoveBy_Right(double d, ThingList targetThings)
{
position.X += d;
int topRow = TopRow;
int bottomRow = BottomRow;
int rightCol = RightCol;
Map map = game.Map;
if (map.IsObstacle(topRow, rightCol) || map.IsObstacle(bottomRow, rightCol))
{
Right = rightCol * Settings.BLOCK_WDITH;
velocity.X = -velocity.X;
}
}
public override void MoveBy_Up(double d, ThingList targetThings)
{
position.Y += d;
int leftCol = LeftCol;
int rightCol = RightCol;
int topRow = TopRow;
Map map = game.Map;
if (map.IsObstacle(topRow, leftCol) || map.IsObstacle(topRow, rightCol))
{
Top = (topRow + 1) * Settings.BLOCK_WDITH;
velocity.Y = -velocity.Y;
}
}
public override void MoveBy_Left(double d, ThingList targetThings)
{
position.X += d;
int topRow = TopRow;
int bottomRow = BottomRow;
int leftCol = LeftCol;
Map map = game.Map;
if (map.IsObstacle(topRow, leftCol) || map.IsObstacle(bottomRow, leftCol))
{
Left = (leftCol + 1) * Settings.BLOCK_WDITH;
velocity.X = -velocity.X;
}
}
public ThingList GetEnemies(GameScene game)
{
ThingList enemies = new ThingList();
for (int i = 0; i < thingData.Length; i++)
{
Thing enemy = CreateEnemyFromData(thingData[i], game);
if (enemy != null)
{
enemies.AddThing(enemy);
}
}
return enemies;
}
public override void Tick(ThingList targetThings)
{
if (life > 0)
{
life--;
}
else
{
Hit();
return;
}
animation = (animation + 1) % NUM_ANIMATIONS;
base.Tick(targetThings);
}
public override void MoveBy_Left(double d, ThingList targetThings)
{
position.X += d;
int topRow = TopRow;
int bottomRow = BottomRow;
int leftCol = LeftCol;
Map map = game.Map;
if (map.IsObstacle(topRow, leftCol) || map.IsObstacle(bottomRow, leftCol))
{
Left = (leftCol + 1) * Settings.BLOCK_WDITH;
velocity.X = -velocity.X;
}
}
public override void Tick(ThingList targetThings)
{
if (life > 0)
{
life--;
}
else
{
Hit();
return;
}
animation = (animation + 1) % NUM_ANIMATIONS;
base.Tick(targetThings);
}
public override void MoveBy_Right(double d, ThingList targetThings)
{
position.X += d;
int topRow = TopRow;
int bottomRow = BottomRow;
int rightCol = RightCol;
Map map = game.Map;
if (map.IsObstacle(topRow, rightCol) || map.IsObstacle(bottomRow, rightCol))
{
Right = rightCol * Settings.BLOCK_WDITH;
velocity.X = -velocity.X;
}
}
public ThingList GetEnemies(GameScene game)
{
ThingList enemies = new ThingList();
for (int i = 0; i < thingData.Length; i++)
{
Thing enemy = CreateEnemyFromData(thingData[i], game);
if (enemy != null)
{
enemies.AddThing(enemy);
}
}
return(enemies);
}
public override void MoveBy_Up(double d, ThingList targetThings)
{
position.Y += d;
int leftCol = LeftCol;
int rightCol = RightCol;
int topRow = TopRow;
Map map = game.Map;
if (map.IsObstacle(topRow, leftCol) || map.IsObstacle(topRow, rightCol))
{
Top = (topRow + 1) * Settings.BLOCK_WDITH;
velocity.Y = -velocity.Y;
}
}
public override void Tick(ThingList targetThings)
{
animation++;
if (animation % 2 == 0)
{
if (damage > 1)
{
damage--;
}
}
if (animation >= NUM_ANIMATIONS)
{
Remove();
}
base.Tick(targetThings);
}
public override void MoveBy_Down(double d, ThingList targetThings)
{
position.Y += d;
int leftCol = LeftCol;
int rightCol = RightCol;
int bottomRow = BottomRow;
Map map = game.Map;
if (map.IsObstacle(bottomRow, leftCol) || map.IsObstacle(bottomRow, rightCol))
{
Bottom = bottomRow * Settings.BLOCK_WDITH;
if (game.Enemies.Count < 64)
{
game.AddEnemy(new Mushroom(game, new Vector(position.X - 16, Bottom - 32)));
}
Hit();
}
}
public override void Tick(ThingList targetThings)
{
animation++;
if (animation % 2 == 0)
{
if (damage > 1)
{
damage--;
}
}
if (animation >= NUM_ANIMATIONS)
{
Remove();
}
base.Tick(targetThings);
}
public override void MoveBy_Down(double d, ThingList targetThings)
{
position.Y += d;
int leftCol = LeftCol;
int rightCol = RightCol;
int bottomRow = BottomRow;
Map map = game.Map;
if (map.IsObstacle(bottomRow, leftCol) || map.IsObstacle(bottomRow, rightCol))
{
Bottom = bottomRow * Settings.BLOCK_WDITH;
if (game.Enemies.Count < 64)
{
game.AddEnemy(new Mushroom(game, new Vector(position.X - 16, Bottom - 32)));
}
Hit();
}
}
public override void MoveBy_Down(double d, ThingList targetThings)
{
position.Y += d;
int leftCol = LeftCol;
int rightCol = RightCol;
int bottomRow = BottomRow;
Map map = game.Map;
if (map.IsObstacle(bottomRow, leftCol) || map.IsObstacle(bottomRow, rightCol))
{
Bottom = bottomRow * Settings.BLOCK_WDITH;
if (isWormEgg)
{
if (game.Enemies.Count < 6)
{
if (!(position.X < game.Map.Width - 256 && position.X > 256) && position.Y > game.Map.Height - 128)
{
game.AddEnemy(new Worm(game, new Vector(position.X - 16, Bottom - 32)));
}
}
}
Hit();
}
else
{
foreach (Thing target in targetThings)
{
if (!target.Shootable)
{
continue;
}
if (Left < target.Right && target.Left < Right && Top < target.Bottom && target.Top < Bottom)
{
if (position.Y < target.Center.Y)
{
Bottom = target.Top;
}
target.Damage(damage);
Hit();
break;
}
}
}
}
public override void Tick(ThingList targetThings)
{
count++;
double a;
if (count < 16)
{
a = 2 * count;
}
else
{
a = 32;
}
double newHeight = baseHeight + a * Math.Sin((double)count / 16.0 * Math.PI + x);
velocity.Y = newHeight - position.Y;
if (Math.Abs(velocity.X) < 8)
{
velocity.X += Math.Sign(velocity.X) * 0.125;
}
base.Tick(targetThings);
}
public override void MoveBy_Down(double d, ThingList targetThings)
{
position.Y += d;
int leftCol = LeftCol;
int rightCol = RightCol;
int bottomRow = BottomRow;
Map map = game.Map;
if (map.IsObstacle(bottomRow, leftCol) || map.IsObstacle(bottomRow, rightCol))
{
Bottom = bottomRow * Settings.BLOCK_WDITH;
if (isWormEgg)
{
if (game.Enemies.Count < 6)
{
if (!(position.X < game.Map.Width - 256 && position.X > 256) && position.Y > game.Map.Height - 128)
{
game.AddEnemy(new Worm(game, new Vector(position.X - 16, Bottom - 32)));
}
}
}
Hit();
}
else
{
foreach (Thing target in targetThings)
{
if (!target.Shootable) continue;
if (Left < target.Right && target.Left < Right && Top < target.Bottom && target.Top < Bottom)
{
if (position.Y < target.Center.Y)
{
Bottom = target.Top;
}
target.Damage(damage);
Hit();
break;
}
}
}
}
public GameScene(StageData data)
{
random = new Random();
map = data.GetMap(this);
// player = new Player(this, 6, 1, Player.Direction.Right);
player = data.GetPlayer(this);
MoveCameraFast(player.Focus);
players = new ThingList();
players.AddThing(player);
// enemies = new ThingList();
enemies = data.GetEnemies(this);
enemyAddList = new ThingList();
playerBullets = new BulletList();
enemyBullets = new BulletList();
items = new ThingList();
door = data.GetExitDoor(this);
particles = new ParticleList();
particleAddList = new ParticleList();
quakeRadius = 0;
quakeVector = Vector.Zero;
flash = 0;
numTicks = 0;
cleared = false;
clearTimer = 0;
gameoverTimer = 0;
gameover = false;
backgroundParticles = new ParticleList();
audio = null;
/*
* enemies.AddThing(new TestEnemy(this, 7, 24, TestEnemy.Direction.Left));
* enemies.AddThing(new TestEnemy(this, 12, 11, TestEnemy.Direction.Left));
* enemies.AddThing(new TestEnemy(this, 12, 24, TestEnemy.Direction.Left));
* enemies.AddThing(new TestEnemy(this, 16, 8, TestEnemy.Direction.Left));
* enemies.AddThing(new TestEnemy(this, 22, 17, TestEnemy.Direction.Left));
*/
}
public GameScene(StageData data)
{
random = new Random();
map = data.GetMap(this);
// player = new Player(this, 6, 1, Player.Direction.Right);
player = data.GetPlayer(this);
MoveCameraFast(player.Focus);
players = new ThingList();
players.AddThing(player);
// enemies = new ThingList();
enemies = data.GetEnemies(this);
enemyAddList = new ThingList();
playerBullets = new BulletList();
enemyBullets = new BulletList();
items = new ThingList();
door = data.GetExitDoor(this);
particles = new ParticleList();
particleAddList = new ParticleList();
quakeRadius = 0;
quakeVector = Vector.Zero;
flash = 0;
numTicks = 0;
cleared = false;
clearTimer = 0;
gameoverTimer = 0;
gameover = false;
backgroundParticles = new ParticleList();
audio = null;
/*
enemies.AddThing(new TestEnemy(this, 7, 24, TestEnemy.Direction.Left));
enemies.AddThing(new TestEnemy(this, 12, 11, TestEnemy.Direction.Left));
enemies.AddThing(new TestEnemy(this, 12, 24, TestEnemy.Direction.Left));
enemies.AddThing(new TestEnemy(this, 16, 8, TestEnemy.Direction.Left));
enemies.AddThing(new TestEnemy(this, 22, 17, TestEnemy.Direction.Left));
*/
}
public override void Tick(ThingList targetThings)
{
count++;
double a;
if (count < 16)
{
a = 2 * count;
}
else
{
a = 32;
}
double newHeight = baseHeight + a * Math.Sin((double)count / 16.0 * Math.PI + x);
velocity.Y = newHeight - position.Y;
if (Math.Abs(velocity.X) < 8)
{
velocity.X += Math.Sign(velocity.X) * 0.125;
}
base.Tick(targetThings);
}
public virtual void Tick(ThingList targetThings)
{
MoveBy(velocity, targetThings);
}
public virtual void MoveBy_Vertical(double d, ThingList targetThings)
{
if (d < 0)
{
MoveBy_Up(d, targetThings);
}
else if (d > 0)
{
MoveBy_Down(d, targetThings);
}
}
public virtual void MoveBy_Up(double d, ThingList targetThings)
{
position.Y += d;
foreach (Thing target in targetThings)
{
if (!target.Shootable) continue;
if (Left < target.Right && target.Left < Right && Top < target.Bottom && target.Top < Bottom)
{
if (position.Y > target.Center.Y)
{
Top = target.Bottom;
}
target.Damage(damage);
Hit();
return;
}
}
int leftCol = LeftCol;
int rightCol = RightCol;
int topRow = TopRow;
Map map = game.Map;
if (map.IsObstacle(topRow, leftCol) || map.IsObstacle(topRow, rightCol))
{
Top = (topRow + 1) * Settings.BLOCK_WDITH;
Hit();
}
}
public virtual void MoveBy_Right(double d, ThingList targetThings)
{
position.X += d;
foreach (Thing target in targetThings)
{
if (!target.Shootable) continue;
if (Left < target.Right && target.Left < Right && Top < target.Bottom && target.Top < Bottom)
{
if (position.X < target.Center.X)
{
Right = target.Left;
}
target.Damage(damage);
Hit();
return;
}
}
int topRow = TopRow;
int bottomRow = BottomRow;
int rightCol = RightCol;
Map map = game.Map;
if (map.IsObstacle(topRow, rightCol) || map.IsObstacle(bottomRow, rightCol))
{
Right = rightCol * Settings.BLOCK_WDITH;
Hit();
}
}
public virtual void MoveBy_Horizontal(double d, ThingList targetThings)
{
if (d < 0)
{
MoveBy_Left(d, targetThings);
}
else if (d > 0)
{
MoveBy_Right(d, targetThings);
}
}
public virtual void MoveBy(Vector d, ThingList targetThings)
{
if (removed)
{
return;
}
MoveBy_Horizontal(d.X, targetThings);
MoveBy_Vertical(d.Y, targetThings);
}
public override void Tick(ThingList targetThings)
{
if (life > 0)
{
life--;
}
else
{
Hit();
return;
}
double minRange = double.MaxValue;
Thing target = null;
foreach (Thing thing in targetThings)
{
double dx = thing.Center.X - position.X;
double dy = thing.Center.Y - position.Y;
double range = dx * dx + dy * dy;
if (range < minRange)
{
minRange = range;
target = thing;
}
}
if (target != null)
{
double dx = target.Center.X - position.X;
double dy = target.Center.Y - position.Y;
double dr = (Math.Atan2(dy, dx) / Math.PI * 180) - direction;
dr = (dr + 180) % 360;
if (dr < 0)
{
dr += 360;
}
dr -= 180;
if (Math.Abs(dr) < rotate)
{
direction += dr;
}
else
{
direction += rotate * Math.Sign(dr);
}
}
if (speed < MAX_SPEED)
{
speed += 0.5;
}
this.velocity = speed * new Vector(Math.Cos((double)direction / 180.0 * Math.PI), Math.Sin((double)direction / 180.0 * Math.PI));
double a = 2 * Math.PI * game.Random.NextDouble();
// if (animation % 2 == 0)
{
game.AddParticle(new PlayerRocketTail(game, position, 0.125 * new Vector(Math.Cos(a), Math.Sin(a))));
}
animation = (animation + 1) % 8;
base.Tick(targetThings);
}
public override void Tick(ThingList targetThings)
{
if (life > 0)
{
life--;
}
else
{
Hit();
return;
}
double minRange = double.MaxValue;
Thing target = null;
foreach (Thing thing in targetThings)
{
if (!thing.Shootable || thing is AtField || thing is EggMachine)
{
continue;
}
double dx = thing.Center.X - position.X;
double dy = thing.Center.Y - position.Y;
double angle = direction / 180.0 * Math.PI;
double dr = dx * Math.Cos(angle) + dy * Math.Sin(angle);
if (dr < 0)
{
continue;
}
double ds = 4 * (dx * Math.Cos(angle + Math.PI / 2) + dy * Math.Sin(angle + Math.PI / 2));
double range = dr * dr + ds * ds;
if (range < minRange)
{
minRange = range;
target = thing;
}
}
if (target != null)
{
double dx = target.Center.X - position.X;
double dy = target.Center.Y - position.Y;
double dr = (Math.Atan2(dy, dx) / Math.PI * 180) - direction;
dr = (dr + 180) % 360;
if (dr < 0) dr += 360;
dr -= 180;
if (Math.Abs(dr) < 0.0625 * speed)
{
direction += dr;
}
else
{
direction += 0.0625 * speed * Math.Sign(dr);
}
}
if (speed < MAX_SPEED)
{
velocity = speed * new Vector(Math.Cos(direction / 180.0 * Math.PI), Math.Sin(direction / 180.0 * Math.PI));
}
else
{
velocity = MAX_SPEED * new Vector(Math.Cos(direction / 180.0 * Math.PI), Math.Sin(direction / 180.0 * Math.PI));
}
if (speed < 2 * MAX_SPEED)
{
speed++;
}
double a = 2 * Math.PI * game.Random.NextDouble();
game.AddParticle(new PlayerRocketTail(game, position, 0.125 * new Vector(Math.Cos(a), Math.Sin(a))));
animation = (animation + 1) % 8;
base.Tick(targetThings);
}
public override void Tick(ThingList targetThings)
{
if (life > 0)
{
life--;
}
else
{
Hit();
return;
}
double minRange = double.MaxValue;
Thing target = null;
foreach (Thing thing in targetThings)
{
if (!thing.Shootable || thing is AtField || thing is EggMachine)
{
continue;
}
double dx = thing.Center.X - position.X;
double dy = thing.Center.Y - position.Y;
double angle = direction / 180.0 * Math.PI;
double dr = dx * Math.Cos(angle) + dy * Math.Sin(angle);
if (dr < 0)
{
continue;
}
double ds = 4 * (dx * Math.Cos(angle + Math.PI / 2) + dy * Math.Sin(angle + Math.PI / 2));
double range = dr * dr + ds * ds;
if (range < minRange)
{
minRange = range;
target = thing;
}
}
if (target != null)
{
double dx = target.Center.X - position.X;
double dy = target.Center.Y - position.Y;
double dr = (Math.Atan2(dy, dx) / Math.PI * 180) - direction;
dr = (dr + 180) % 360;
if (dr < 0)
{
dr += 360;
}
dr -= 180;
if (Math.Abs(dr) < 0.0625 * speed)
{
direction += dr;
}
else
{
direction += 0.0625 * speed * Math.Sign(dr);
}
}
if (speed < MAX_SPEED)
{
velocity = speed * new Vector(Math.Cos(direction / 180.0 * Math.PI), Math.Sin(direction / 180.0 * Math.PI));
}
else
{
velocity = MAX_SPEED * new Vector(Math.Cos(direction / 180.0 * Math.PI), Math.Sin(direction / 180.0 * Math.PI));
}
if (speed < 2 * MAX_SPEED)
{
speed++;
}
double a = 2 * Math.PI * game.Random.NextDouble();
game.AddParticle(new PlayerRocketTail(game, position, 0.125 * new Vector(Math.Cos(a), Math.Sin(a))));
animation = (animation + 1) % 8;
base.Tick(targetThings);
}
public virtual void Tick(ThingList targetThings)
{
MoveBy(velocity, targetThings);
}