public void Move(MovementResult mr, bool grow)
{
// save off the old head location, and compute the new one
mr.OldHead = Segments[HeadIdx];
mr.NewHead.X = (byte)(mr.OldHead.X + deltaX);
mr.NewHead.Y = (byte)(mr.OldHead.Y + deltaY);
// grow the array if necessary, and remember the last
// segment of the tail.
if (grow)
{
Array.Resize(ref Segments, Segments.Length + 1);
HeadIdx = HeadIdx + 1;
if (HeadIdx < (Segments.Length - 1))
{
Array.Copy(Segments, HeadIdx, Segments, HeadIdx + 1, Segments.Length - HeadIdx - 1);
}
mr.MovedTail.X = 255; // 255 == growing, ignore
mr.MovedTail.Y = 255; // 255 == growing, ignore
}
else
{
HeadIdx = HeadIdx + 1;
if (HeadIdx == Segments.Length)
{
HeadIdx = 0;
}
mr.MovedTail = Segments[HeadIdx];
}
// Set the new head location
Segments[HeadIdx] = mr.NewHead;
}
private void DrawUpdates(MovementResult mr)
{
if (mr.MovedTail.Y != 255)
{
// 255 signals that we grew... it's hacky but deliciously so
Console.SetCursorPosition(mr.MovedTail.X, mr.MovedTail.Y);
Console.Write(' ');
}
Console.SetCursorPosition(mr.NewHead.X, mr.NewHead.Y);
Console.ForegroundColor = ConsoleColor.Green;
Console.Write('@');
Console.ForegroundColor = ConsoleColor.Cyan;
Console.SetCursorPosition(mr.OldHead.X, mr.OldHead.Y);
Console.Write('#');
Console.SetCursorPosition(Console.WindowLeft,
Console.WindowTop + Console.WindowHeight - 1);
}
public void RunGame()
{
// write the initial location
Console.SetCursorPosition(10, 10);
Console.Write('@');
DrawApple();
var mr = new MovementResult();
while (true)
{
System.Threading.Thread.Sleep(Speed + SpFactor);
ReadUserInput();
snake.Move(mr, grow);
grow = false;
if (OutOfBounds() || snake.SelfCollision())
{
break;
}
DrawUpdates(mr);
if (apples.Eaten(mr.NewHead))
{
grow = true;
apples.GrowNew(Console.WindowWidth,
Console.WindowHeight - 1,
snake.Collision);
DrawApple();
if (Speed > 10)
{
Speed -= 10;
}
}
}
bool OutOfBounds() =>
(mr.NewHead.X >= Console.WindowWidth) ||
(mr.NewHead.Y >= Console.WindowHeight - 1);
}