/**
* moves snake in a given direction
*/
public bool move()
{
erase();
if (!isBarrier((Cell)body [0]))
{
for (int i = body.Count - 1; i >= 0; i--)
{
Cell obj = (Cell)body [i];
if (isFood && i == body.Count - 1)
{
body.Add(new Cell(obj.getX(), obj.getY(), Constants.SNAKE_BODY));
}
if (obj.getType().Equals(Constants.SNAKE_HEAD))
{
switch (direction)
{
case (0):
{
obj.setY(obj.getY() - 1);
break;
}
case (1):
{
obj.setX(obj.getX() + 1);
break;
}
case (2):
{
obj.setY(obj.getY() + 1);
break;
}
case (3):
{
obj.setX(obj.getX() - 1);
break;
}
}
}
else
{
Cell previous = (Cell)body [i - 1];
obj.setX(previous.getX());
obj.setY(previous.getY());
}
}
drawSnake();
if (isFood)
{
isFood = false;
placeFood();
}
return(true);
}
return(false);
}
/**
* place new food on field
*/
private void placeFood()
{
Random random = new Random();
food = new Cell(0, 0, Constants.FOOD);
food.setX(random.Next(Constants.FIELD_WIDTH - 10) + 5);
food.setY(random.Next(Constants.FIELD_HEIGHT - 6) + 3);
food.draw();
}