public Snake(int length)
{
alive = true;
position = new Coordinates(Global.snakeStartingPosition);
head = new SnakeHead(Global.defaultSnakeHeadTexture, position);
/* Link snake position to head position. */
this.position = head.position;
body = new SnakeBody(Global.defaultSnakeBodyTexture, position, length);
}
public SnakeBody(Texture bodyTexture, Coordinates position, int length)
{
isBitten = false;
texture = bodyTexture;
bodyParts = new List<SnakeBodyPart>();
for (int i = 0; i < length; i++)
{
bodyParts.Add(new SnakeBodyPart(texture, position));
this.length++;
}
}
public void SetTo(Coordinates coordinates)
{
this.X = coordinates.X;
this.Y = coordinates.Y;
}
public Coordinates(Coordinates coordinates)
{
this.X = coordinates.X;
this.Y = coordinates.Y;
}
public SnakeHead(Texture headTexture, Coordinates headPosition)
{
texture = headTexture;
position = new Coordinates(headPosition);
previousPosition = new Coordinates(headPosition);
targetPosition = new Coordinates(headPosition);
}
public SnakeBodyPart(Texture bodyTexture, Coordinates partPosition)
{
texture = bodyTexture;
position = new Coordinates(partPosition);
previousPosition = new Coordinates(partPosition);
targetPosition = new Coordinates(partPosition);
parentPosition = new Coordinates(partPosition);
}
public void Update(SnakeHead head)
{
bodyParts[0].parentPosition.SetTo(head.position);
// Move first element
if(!bodyParts[0].targetPosition.Equals(bodyParts[0].parentPosition)){
// Save previous position
bodyParts[0].previousPosition.SetTo(bodyParts[0].position);
// Set position to target position
bodyParts[0].position.SetTo(bodyParts[0].targetPosition);
// Set new target position
bodyParts[0].targetPosition.SetTo(head.position);
}
// Save the location of the snakes trail
trailPosition = new Coordinates(bodyParts.Last().previousPosition);
// Rest should follow suit
for (int i = 1; i < bodyParts.Count; i++)
{
// Update each part with its superior part
bodyParts[i].Update(bodyParts[i-1]);
// Check for self-cannibalism while you are at it, hunny.
if (bodyParts[i].position.Equals(head.position))
{
isBitten = true;
}
}
}
