public void AddNewSegment(Point position)
{
SnakeSegments.Add(new SnakeSegment(position, Settings.SnakeSegmentSize, false));
SpeedUp();
NotifyOfPropertyChange(() => SnakeSegments);
}
public void AddSegment()
{
if (SnakeSegments.Count > 0)
{
_score += 100;
}
SnakeSegments.Add(new SnakeSegment(_snakeTailSprite, _lastSegmentPosition, _lastSegmentRotation, _lastSegmentDirection));
}
public void Move()
{
for (int i = SnakeSegments.Count - 1; i > 0; i--)
{
SnakeSegments[i].Move(SnakeSegments[i - 1].Position);
}
//move the head
Point NewPosition = new Point();
switch (Direction)
{
case Direction.Up:
NewPosition.Y = SnakeSegments.First().Position.Y - Settings.SnakeSegmentSize;
NewPosition.X = SnakeSegments.First().Position.X;
break;
case Direction.Down:
NewPosition.Y = SnakeSegments.First().Position.Y + Settings.SnakeSegmentSize;
NewPosition.X = SnakeSegments.First().Position.X;
break;
case Direction.Left:
NewPosition.X = SnakeSegments.First().Position.X - Settings.SnakeSegmentSize;
NewPosition.Y = SnakeSegments.First().Position.Y;
break;
case Direction.Right:
NewPosition.X = SnakeSegments.First().Position.X + Settings.SnakeSegmentSize;
NewPosition.Y = SnakeSegments.First().Position.Y;
break;
case Direction.None:
NewPosition = SnakeSegments.First().Position;
break;
}
SnakeSegments.First().Move(NewPosition);
NotifyOfPropertyChange(() => SnakeSegments);
}
public void Update(GameTime gameTime)
{
// See if SnakeHead is ready to be moved again
if (!SnakeHead.CanUpdate())
{
return;
}
SnakeHead.Direction = LastInputDirection;
if (SnakeSegments.Count < _segmentCount)
{
if (SnakeSegments.Count == 0)
{
_lastSegmentPosition = SnakeHead.Position;
_lastSegmentRotation = SnakeHead.Direction.ToRadius();
_lastSegmentDirection = SnakeDirection.Right;
}
AddSegment();
}
// Previous position of the SnakeHead before Update
Vector2 previousSnakeHeadPosition = SnakeHead.Position;
float previousSnakeHeadRotation = SnakeHead.Rotation;
SnakeDirection previousSnakeHeadDirection = SnakeHead.Direction;
// Move Snake Head
SnakeHead.Update(gameTime);
Vector2 previousPosition = Vector2.Zero;
float previousRotation = 0f;
SnakeDirection previousDirection = SnakeDirection.Right;
for (int i = 0; i < SnakeSegments.Count; i++)
{
bool isFirstSegment = i == 0;
bool isTail = i == SnakeSegments.Count - 1;
SnakeSegment currentSegment = SnakeSegments[i];
currentSegment.Sprite = isTail ? _snakeTailSprite : _straightBodySprite;
if (isFirstSegment)
{
previousPosition = currentSegment.Position;
previousRotation = currentSegment.Rotation;
previousDirection = currentSegment.Direction;
currentSegment.Position = previousSnakeHeadPosition;
currentSegment.Rotation = previousSnakeHeadRotation;
currentSegment.Direction = previousSnakeHeadDirection;
}
else
{
Vector2 positionToConsume = previousPosition;
float rotationToConsume = previousRotation;
SnakeDirection directionToConsume = previousDirection;
previousPosition = currentSegment.Position;
previousRotation = currentSegment.Rotation;
previousDirection = currentSegment.Direction;
currentSegment.Position = positionToConsume;
currentSegment.Rotation = rotationToConsume;
currentSegment.Direction = directionToConsume;
}
}
for (int i = 0; i < SnakeSegments.Count; i++)
{
SnakeDirection previousSegmentDirection;
SnakeDirection currentSegmentDirection;
SnakeDirection nextSegmentDirection;
SnakeSegment currentSegment = SnakeSegments[i];
currentSegmentDirection = currentSegment.Direction;
previousSegmentDirection = i == 0 ? SnakeHead.Direction : SnakeSegments[i - 1].Direction;
if (i < SnakeSegments.Count - 1)
{
nextSegmentDirection = SnakeSegments[i + 1].Direction;
/*
* Set correct sprite and rotation based on previous, current, and next segment directions
*/
ApplyAppropriateSpriteAndRotation(ref currentSegment, previousSegmentDirection, currentSegmentDirection, nextSegmentDirection);
}
else
{
currentSegment.NoRotation = false;
currentSegment.Rotation = currentSegment.Direction.ToRadius();
}
}
// Save last segment position so that new segments can use it as their starting position
_lastSegmentPosition = SnakeSegments.Last().Position;
//// Save last segment position so that new segments can use it as their starting position
if (SnakeSegments.Count == 1)
{
_lastSegmentRotation = SnakeHead.Rotation;
_lastSegmentDirection = SnakeHead.Direction;
}
else
{
_lastSegmentRotation = SnakeSegments.Last().Rotation;
_lastSegmentDirection = SnakeSegments.Last().Direction;
}
}
