public static Position GetVector(Position source, Position target)
{
double distance = Calc.GetDistance(source, target);
double deltaX = (target.X - source.X) / distance;
double deltaY = (target.Y - source.Y) / distance;
return new Position(deltaX,deltaY);
}
static void EvaluatePool()
{
Position poolCenter = new Position(0, 0);
// checks for collision between frogs - both are dead
if (Calc.GetDistance(frogs[0].Pos, frogs[1].Pos) < 2 * Frog.FrogRadius)
{
algoAlive[0] = false;
algoAlive[1] = false;
return;
}
// checks for collision between each frog and pool border - each is dead
for (int i = 0; i < frogs.Length; i++)
{
if (Calc.GetDistance(frogs[i].Pos, poolCenter) + Frog.FrogRadius > Frog.PoolRadus)
{
algoAlive[i] = false;
return;
}
}
// checks for collision with enemy bullet
for (int i = 0; i < frogs.Length; i++)
{
for (int bul = 0; bul < bullets[i].Count; bul++)
{
for (int j = 0; j < Bullet.BulletSpeed; j++)
{
if (Calc.GetDistance(bullets[i][bul].Pos, frogs[frogs.Length - i - 1].Pos) < Frog.FrogRadius)
{
algoAlive[frogs.Length - i - 1] = false;
}
// adds single target vector to current bullet position
bullets[i][bul].Pos = bullets[i][bul].Pos.Add(bullets[i][bul].Target);
// checks for out of pool condition
if (Calc.GetDistance(bullets[i][bul].Pos, poolCenter) > Frog.PoolRadus)
{
bullets[i].RemoveAt(bul);
break;
}
}
}
}
// update pool radius
Frog.PoolRadus--;
}
public Position Add(Position vector)
{
return new Position(this.X + vector.X, this.Y + vector.Y);
}
public static double GetDistance(Position source, Position target)
{
return Math.Sqrt((source.X - target.X) * (source.X - target.X) + (source.Y - target.Y) * (source.Y - target.Y));
}
public static Position RotateVectorCounterClockwise(Position source)
{
// (x,y) => (y, -x)
return new Position(source.Y, -source.X);
}
public static Position RotateVectorClockwise(Position source)
{
// (x,y) => (-y, x)
return new Position(-source.Y, source.X);
}
public static bool HasImpact(Position source, double radius, Position target)
{
return (GetDistance(source, target) <= radius);
}
static void SaveMove( string text = "")
{
text = text.Replace(Environment.NewLine, " ");
string[] input = text.Split(' ');
// shoot first from current position if it can
if (input.Length > 3 && input[3] == "shoot" && frogs[bothAlgosCounter % 2].TimeToReload == 0)
{
Position target = new Position(double.Parse(input[4]), double.Parse(input[5]));
Position vector = Calc.GetVector(frogs[bothAlgosCounter % 2].Pos, target);
// puts bullet ar pair of current position and single vector for the next move
bullets[bothAlgosCounter % 2].Add(
new Bullet(frogs[bothAlgosCounter % 2].Pos.X, frogs[bothAlgosCounter % 2].Pos.Y, vector.X, vector.Y));
// sets reload waiting time
frogs[bothAlgosCounter % 2].TimeToReload = 8;
}
// then moves to new position
if (input[0] == "move")
{
// gets the requested new position and if it is above distance of MaxJumpDistance (2.0)
// calculates the vector, scales it and add it to the current position
Position next = new Position(double.Parse(input[1]), double.Parse(input[2]));
if (Calc.GetDistance(frogs[bothAlgosCounter % 2].Pos, next) > Frog.MaxJumpDistance)
{
frogs[bothAlgosCounter % 2].Pos =
frogs[bothAlgosCounter % 2].Pos.Add(Calc.GetVector(frogs[bothAlgosCounter % 2].Pos, next).Scale(2.0));
}
else
{
frogs[bothAlgosCounter % 2].Pos = next;
}
}
}
public bool GetShoot(out Position target)
{
bool shoot = (this.IsShooting && this.CanShoot);
target = new Position(this.ShootTargetPos.X, this.ShootTargetPos.Y); // copy
return shoot;
}
public bool RunFromPoolBorder()
{
bool moved = false;
Position center = new Position(0, 0);
Position toCheck = this.Pos;
double distanceToBorder = PoolRadus - (Calc.GetDistance(toCheck, center) + FrogRadius);
if (distanceToBorder < MinimalDistanceToBorder)
{
// move to the center immediately with max speed
this.NextMovePos = this.Pos.Add(Calc.GetVector(toCheck, center).Scale(MaxJumpDistance));
moved = true;
}
return moved;
}
public bool RunFromEnemy(Frog enemy)
{
// try to keep distance to enemy as much as possible
// move randomly to the left or to the right of the vector between frogs
// get enemy direction
Position enemyVector = Calc.GetVector(this.Pos, enemy.Pos);
// hardcoded decision table with random selector
Position[] moves = new Position[12];
moves[0] = Calc.GetVector(this.Pos, new Position(0, 0)); // run to center
moves[1] = Calc.RotateVectorClockwise(enemyVector); // run clockwise to the enemy position
moves[2] = Calc.RotateVectorCounterClockwise(enemyVector); // run counter-clockwise to the enemy position
moves[3] = moves[0]; // run to center
moves[4] = moves[0]; // run to center
moves[5] = moves[1]; // run counter-clockwise to the enemy position
moves[6] = moves[1]; // run counter-clockwise to the enemy position
moves[7] = moves[0]; // run to center
moves[8] = moves[2]; // run counter-clockwise to the enemy position
moves[9] = moves[1]; // run counter-clockwise to the enemy position
moves[10] = enemyVector; // run forward to the enemy
moves[11] = new Position(0,0); // stay at current position
double distanceToEnemy = Calc.GetDistance(this.Pos, enemy.Pos);
double scaleFactor = generator.NextDouble() * (Frog.MaxJumpDistance - Frog.MinJumpDistance) + Frog.MinJumpDistance;
// check if frogs are in range (in 2 moves bullet can reach the frog, but we can run away in these 2 moves)
bool closeToEnemy = (distanceToEnemy < 2 * Bullet.BulletSpeed);
// and if yes - exclude last two choices - stay and move forward
int chooseMove = generator.Next(closeToEnemy ? moves.Length - 2 : moves.Length);
this.NextMovePos = this.Pos.Add(moves[chooseMove].Scale(scaleFactor));
if (closeToEnemy)
{
ShootAtEnemy(enemy);
}
return (chooseMove != 3); // if stays then no move has been selected
}
