public void move(SnakeType snake, FoodType food, LevelType level)
{
PortalType portal;
random = RandomGenerator.generator.Next();
deduceThreat(snake, food);
deduceMove();
if (moveFood)
{
deduceOrientation(snake, food);
if (level.tryGetPortal(food.Vector, out portal))
{
if (orientation == portal.Entrance)
{
if (!portal.Link.IsFull)
{
portal.teleport();
portal.clearGrid(level);
}
}
else
{
movement(snake, food, level);
}
}
else
{
movement(snake, food, level);
}
}
}
//Returns an orientation facing the snake, giving the food a predatory movement
private void attackOrientation(SnakeType snake, FoodType food)
{
switch (snake.Orientation)
{
case OrientationType.up:
case OrientationType.down:
if (snake.Vector.X < food.Vector.X)
{
orientation = OrientationType.left;
}
else
{
orientation = OrientationType.right;
}
break;
case OrientationType.left:
case OrientationType.right:
if (snake.Vector.Y < food.Vector.Y)
{
orientation = OrientationType.up;
}
else
{
orientation = OrientationType.down;
}
break;
}
}
//This region contains all in-game events
#region Events
void EatenFood(object sender, FoodArgs args)
{
SnakeType snake = sender as SnakeType;
FoodType foodEaten = args.getFood(snake.Vector);
snake.addSegment(foodEaten.Growth);
foodEaten.spawn(level.Grid);
SoundManager.playSound("Munch");
updateScore(foodEaten);
}
private void deduceOrientation(SnakeType snake, FoodType food)
{
int number = random % upperBound;
switch (threat)
{
case ThreatLevel.low:
if (number == 0)
{
randomOrientation();
}
else if (number == 1)
{
directionalOrientation(food);
}
else
{
attackOrientation(snake, food);
}
break;
case ThreatLevel.medium:
if (number == 0 || number == 1)
{
randomOrientation();
}
else if (number == 2)
{
attackOrientation(snake, food);
}
else
{
smartOrientation(snake);
}
break;
case ThreatLevel.high:
if (number == 0 || number == 1)
{
attackOrientation(snake, food);
}
else
{
smartOrientation(snake);
}
break;
}
}
//Returns an orientation that allows the AI to get in front of the snake
private void smartOrientation(SnakeType snake)
{
int number = random % 2;
switch (snake.Orientation)
{
case OrientationType.up:
case OrientationType.down:
orientation = (OrientationType)(2 + number);
break;
case OrientationType.left:
case OrientationType.right:
orientation = (OrientationType)(number);
break;
}
}
//Returns the same orientation as the snake, simulating the food running from the snake
private void runOrientation(SnakeType snake, FoodType food)
{
bool temp = false;
//Determine if food is in front of snake
switch (snake.Orientation)
{
case OrientationType.up:
if (snake.Vector.Y > food.Vector.Y)
{
temp = true;
}
break;
case OrientationType.down:
if (snake.Vector.Y < food.Vector.Y)
{
temp = true;
}
break;
case OrientationType.left:
if (snake.Vector.X > food.Vector.X)
{
temp = true;
}
break;
case OrientationType.right:
if (snake.Vector.X < food.Vector.X)
{
temp = true;
}
break;
}
//If the food is in front of snake, run, else random
if (temp)
{
orientation = snake.Orientation;
}
else
{
randomOrientation();
}
}
private void deduceThreat(SnakeType snake, FoodType food)
{
int yClose = (int)(snake.Vector.Y - food.Vector.Y);
int xClose = (int)(snake.Vector.X - food.Vector.X);
if ((Math.Abs(yClose) <= innerZone) || (Math.Abs(xClose) <= innerZone))
{
threat = ThreatLevel.high;
}
else if ((Math.Abs(yClose) <= outerZone) || (Math.Abs(xClose) <= outerZone))
{
threat = ThreatLevel.medium;
}
else if ((Math.Abs(yClose) > outerZone) || (Math.Abs(xClose) > outerZone))
{
threat = ThreatLevel.low;
}
}
private void movement(SnakeType snake, FoodType food, LevelType level)
{
PortalType portal;
//If the food is in a portal, clear the portal
if (level.tryGetPortal(food.Vector, out portal))
{
portal.clearGrid(level);
}
//Else empty the old grid cell
else
{
level.Grid.GetCell(food.Vector).emptyCell();
}
//Add the movement vector to the current mouse vector
Vector2 newLocation = food.Vector + MovementFunctions.calculateLocation(orientation);
if (level.tryGetPortal(newLocation, out portal))
{
if (!portal.IsFull)
{
food.Vector = newLocation;
portal.fillPortal(food);
}
}
else if (level.Grid.GetCell(newLocation).content == CellContent.snake)
{
if (classification == FoodClassification.threat)
{
snake.GameOver(this, new EventArgs());
}
}
else if (level.Grid.GetCell(newLocation).content == CellContent.empty)
{
food.Vector = newLocation;
}
food.fillGrid(level);
}
public void update(SnakeType snake, LevelType level)
{
if (counter == food.Count)
{
counter = 0;
}
food[counter].update(snake, level);
if (food.Count > 7)
{
if (counter + 7 >= food.Count)
{
food[(counter + 7) - food.Count].update(snake, level);
}
else
{
food[counter + 7].update(snake, level);
}
}
counter++;
}
/// <summary>
/// Updates the food item's AI agent, which moves the food.
/// </summary>
/// <param name="snake">The snake, which is controlled by the user.</param>
/// <param name="level">The current level.</param>
public void update(SnakeType snake, LevelType level)
{
ai.move(snake, this, level);
}