private void lengthenSnake()
{
//Make deep copy of end body segment
BodySegment endBodySegment = bodySegments[bodySegments.Count - 1];
BodySegment newEndBodySegment = endBodySegment.deepCopy();
//Modify deep copy's coordinates and distance till next turn
if (endBodySegment.goingUp)
{
newEndBodySegment.y += 20;
}
else if (endBodySegment.goingDown)
{
newEndBodySegment.y -= 20;
}
else if (endBodySegment.goingLeft)
{
newEndBodySegment.x += 20;
}
else if (endBodySegment.goingRight)
{
newEndBodySegment.x -= 20;
}
//Add new body segment to list of body segments if snake is not lined up perfectly
if (endBodySegment.distancesTillTurns.Count != 0)
{
newEndBodySegment.distancesTillTurns[0] += 20;
}
bodySegments.Add(newEndBodySegment);
}
//Description: Returns deep copy of calling body segment.
public BodySegment deepCopy()
{
//Determine which way calling body segment is going and then tell copy to move same way
direction dir = direction.L;
if (goingUp)
{
dir = direction.U;
}
else if (goingDown)
{
dir = direction.D;
}
else if (goingLeft)
{
dir = direction.L;
}
else if (goingRight)
{
dir = direction.R;
}
BodySegment deepCopyOfBodySegment = new BodySegment(x, y, l, bodySegmentColor, dir);
if (distancesTillTurns.Count != 0)
{
for (int i = 0; i < distancesTillTurns.Count; i++)
{
deepCopyOfBodySegment.distancesTillTurns.Add(distancesTillTurns[i]);
}
}
if (waysToTurn.Count != 0)
{
foreach (direction d in waysToTurn)
{
deepCopyOfBodySegment.waysToTurn.Enqueue(d);
}
}
return(deepCopyOfBodySegment);
}
public void updateGame()
{
//Update snake
snakeHead.update();
if (appleCollidesWithSnakeHead())
{
//When the snake head collides with an apple
while (appleCollidesWithSnakeHead() || appleCollidesWithBodyOfSnake() || appleIsToCloseToSnakeHead())
{
apple = new Apple(foregroundColor);
growSnake = true;
}
}
//Snake grows if player just hit an apple
if (growSnake)
{
biteSoundEffect.Play();
lengthenSnake();
growSnake = false;
++playerScore;
}
//If a cover collides with the last body segment, stop drawing it.
BodySegment lastBodySegment = bodySegments[bodySegments.Count() - 1];
for (int i = 0; i < covers.Count; ++i)
{
if (covers[i].collides(lastBodySegment.x, lastBodySegment.y))
{
covers.RemoveAt(i);
}
}
//Update all the body segments
for (int i = 0; i < bodySegments.Count; ++i)
{
bodySegments[i].update();
}
}