/// <summary>
/// Spawn worm.
/// </summary>
/// <param name="x">Horizontal field position</param>
/// <param name="y">Vertical field position</param>
/// <param name="length">Worm length</param>
/// <param name="color">Worm color</param>
/// <returns>Worm or null</returns>
public Worm Spawn(int x, int y, int length, Color color)
{
LengthCap = 1;
Length = 1;
moving = true;
head.Color = color;
firstModule = modules.Enable();
if (firstModule == null)
{
Disable(false);
return(null);
}
firstModule.Position = new Vector2(collision.EntityX(x), collision.EntityY(y));
firstModule.SetTarget(collision.EntityX(x), collision.EntityY(y));
eraser.X = -size;
eraser.Y = -size;
head.SetPosition(firstModule.Position);
lastModule = firstModule;
for (int i = 1; i < length; i++)
{
Grow();
}
direction = Random.ValidDirection(collision, Position, size);
collision.Set(this, x, y);
return(this);
}
/// <summary>
/// Initialize optimization buffer and check if any of the neighbours has the same color.
/// </summary>
/// <param name="wormModule">Worm.firstModule</param>
/// <param name="wormLength">Worm length</param>
/// <returns>Spawn current block</returns>
private bool InitBuffer(WormModule wormModule, int wormLength)
{
bool spawn = true;
for (int i = 0; i < wormLength; i++)
{
int x = collision.X(wormModule.Target.X);
int y = collision.Y(wormModule.Target.Y);
optimizationBuffer[x, y] = true;
if (FindNeighbors(x, y))
{
spawn = false;
}
if (x < left)
{
left = x;
}
if (y < bottom)
{
bottom = y;
}
if (x > right)
{
right = x;
}
if (y > top)
{
top = y;
}
wormModule = wormModule.Next;
}
return(spawn);
}
/// <summary>
/// Grow worm by adding one module to it.
/// </summary>
private void Grow()
{
newModule = modules.Enable();
if (newModule == null)
{
return;
}
newModule.Position = lastModule.Position;
newModule.SetTarget(lastModule.Target);
lastModule.ResetDirection();
lastModule.Next = newModule;
lastModule = newModule;
LengthCap++;
}