public void Move(Directions direction)
{
int xPosIncrement = 0, yPosIncrement = 0;
switch (direction)
{
case Directions.Up:
--yPosIncrement;
break;
case Directions.Right:
++xPosIncrement;
break;
case Directions.Down:
++yPosIncrement;
break;
case Directions.Left:
--xPosIncrement;
break;
}
ISnakeBodyPart currentBodyPart = BodyParts.First();
int previousSnakeBodyPartXPosition = currentBodyPart.XPos;
int previousSnakeBodyPartYPosition = currentBodyPart.YPos;
currentBodyPart.SetPosition(currentBodyPart.XPos + xPosIncrement, currentBodyPart.YPos + yPosIncrement);
for (int i = 1; i < BodyParts.Count; ++i)
{
currentBodyPart = BodyParts[i];
currentBodyPart.SetPosition(previousSnakeBodyPartXPosition, previousSnakeBodyPartYPosition);
previousSnakeBodyPartXPosition = currentBodyPart.XPos;
previousSnakeBodyPartYPosition = currentBodyPart.YPos;
}
}
internal SnakeBodyPart(int xPos, int yPos, bool isSnakeHead, ISnakeBodyPart nextBodyPart)
{
XPos = xPos;
YPos = yPos;
IsSnakeHead = isSnakeHead;
NextBodyPart = nextBodyPart;
}
public static ISnake GenerateSnake(int startingXpos, int startingYPos, int length)
{
ExceptionHelper.ThrowArgumentOutOfRangeIfZeroOrLower(nameof(length), length);
ISnakeBodyPart[] snakeBodyParts = new ISnakeBodyPart[length];
ISnakeBodyPart nextBodyPart = null;
for (int i = length - 1; i >= 0; --i)
{
ISnakeBodyPart currentSnakeBodyPart = new SnakeBodyPart(startingXpos, startingYPos, i == 0, nextBodyPart);
snakeBodyParts[i] = currentSnakeBodyPart;
nextBodyPart = currentSnakeBodyPart;
}
return(new Snake(snakeBodyParts));
}
public void NextTurnTest_DirectionDown()
{
const int Width = 10;
const int Height = 10;
const int startingXPos = 5;
const int startingYPos = 5;
const int startingSnakeLength = 1;
SnakeGameHandler gameHandler = new SnakeGameHandler();
gameHandler.SetupGame(Width, Height, startingXPos, startingYPos, startingSnakeLength);
const int expectedXPosition = startingXPos;
const int expectedYPosition = startingYPos + 1;
gameHandler.NextTurn(Enums.Directions.Down);
ISnakeBodyPart snakeHead = gameHandler.Snake.BodyParts.First(bodyPart => bodyPart.IsSnakeHead);
Assert.AreEqual(expectedXPosition, snakeHead.XPos);
Assert.AreEqual(expectedYPosition, snakeHead.YPos);
}
public bool IsGameOver()
{
ISnakeBodyPart headBodyPart = Snake.BodyParts.First(bodypart => bodypart.IsSnakeHead);
return(Snake.BodyParts
.Any(bodyPart // Any Bodypart out of Borders
=> bodyPart.XPos >= GameWidth ||
bodyPart.XPos < 0 ||
bodyPart.YPos >= GameHeight ||
bodyPart.YPos < 0)
||
(
Snake.BodyParts // Snakehead hitting other bodypart
.Any(bodyPart
=> bodyPart.XPos == headBodyPart.XPos &&
bodyPart.YPos == headBodyPart.YPos) &&
Snake.BodyParts // Not all bodyparts are in the same position
.Count(bodyPart
=> bodyPart.XPos == headBodyPart.XPos &&
bodyPart.YPos == headBodyPart.YPos)
!= Snake.BodyParts.Count
));
}
