internal int moveSnake(Game myGame, int unitLength)
{
bool hitFood = false;
SnakeBody index = this.head;
int lastX = index.rectangleLeft;
int lastY = index.rectangleTop;
index.rectangleLeft += horizonMove;
index.rectangleTop += verticalMove;
if(head.rectangleLeft >= myGame.borderRight || head.rectangleLeft < myGame.borderLeft || head.rectangleTop >= myGame.borderBottom || head.rectangleTop < myGame.borderTop)
{
MessageBox.Show("too bad");
Environment.Exit(1);
return 1;
}
if (head.rectangleLeft == myGame.foodLocX && head.rectangleTop == myGame.foodLocY)
{
hitFood = true;
}
index = index.next;
while (index != null)
{
int tmpX = index.rectangleLeft;
int tmpY = index.rectangleTop;
index.rectangleLeft = lastX;
index.rectangleTop = lastY;
lastX = tmpX;
lastY = tmpY;
index = index.next;
}
if (hitFood)
{
SnakeBody newBody = new SnakeBody(lastX, lastY, unitLength);
newBody.bodyBlock.Fill = myGame.foodRec.Fill;
tail.next = newBody;
tail = newBody;
myGame.generateFoodLoc(unitLength);
}
else
{
myGame.obstacle.RemoveAt(0);
}
Tuple<int, int> newTuple = new Tuple<int, int>(head.rectangleLeft, head.rectangleTop);
if(myGame.obstacle.Contains(newTuple))
{
MessageBox.Show("too bad");
Environment.Exit(1);
}
else
{
myGame.obstacle.Add(new Tuple<int, int>(head.rectangleLeft, head.rectangleTop));
}
return 0;
}