/**
* 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);
}
/**
* check cell for obstruction
*/
private bool isBarrier(Cell head)
{
int x;
int y;
x = head.getX();
y = head.getY();
if (x <= 1 || x >= Constants.FIELD_WIDTH - 1)
{
return(true);
}
else if (y <= 1 || y >= Constants.FIELD_HEIGHT - 1)
{
return(true);
}
else if (x == food.getX() && y == food.getY())
{
isFood = true;
}
foreach (Cell obj in body)
{
if (!obj.getType().Equals(Constants.SNAKE_HEAD))
{
if (obj.getX() == x && obj.getY() == y)
{
return(true);
}
}
}
return(false);
}
