private BlockShape Rotate90Clockwise(BlockShape bs)
{
return(new BlockShape
{
Units = bs.Units.Select(u => new Unit
{
X = -u.Y,
Y = u.X
}).ToList()
});
}
private BlockShape ReflectXAxis(BlockShape bs)
{
return(new BlockShape
{
Units = bs.Units.Select(u => new Unit
{
X = -u.X,
Y = u.Y
}).ToList()
});
}
public State GetRandomNeighbour(Random r)
{
int containerTop = container.Top();
int containerBottom = container.Bottom();
int containerRight = container.Right();
int containerLeft = container.Left();
int pieceIndex = r.Next(pieces.Count);
List <BlockShape> orientations = pieces[pieceIndex].Orientations().Select(o => o.Normalize()).ToList();
int orientationIndex = r.Next(orientations.Count);
BlockShape po = orientations[orientationIndex];
int pieceRight = po.Right();
int pieceBottom = po.Bottom();
int xOffset = r.Next(containerRight - containerLeft - pieceRight + 1);
int yOffset = r.Next(containerBottom - containerTop - pieceBottom + 1);
State copy = Copy();
copy.pieces[pieceIndex] = po.Normalize(xOffset, yOffset);
return(copy);
}
public List <BlockShape> Orientations()
{
BlockShape r0cw = Copy();
BlockShape r90cw = Rotate90Clockwise(r0cw);
BlockShape r180cw = Rotate90Clockwise(r90cw);
BlockShape r270cw = Rotate90Clockwise(r180cw);
BlockShape r0cwrx = ReflectXAxis(r0cw);
BlockShape r90cwrx = ReflectXAxis(r90cw);
BlockShape r180cwrx = ReflectXAxis(r180cw);
BlockShape r270cwrx = ReflectXAxis(r270cw);
return(new List <BlockShape>
{
r0cw,
r90cw,
r180cw,
r270cw,
r0cwrx,
r90cwrx,
r180cwrx,
r270cwrx
});
}
public bool Intersects(BlockShape bs)
{
return(bs.Units.Any(bsu =>
Units.Any(u =>
bsu.X == u.X && bsu.Y == u.Y)));
}
public bool Contains(BlockShape bs)
{
return(bs.Units.TrueForAll(bsu =>
Units.Any(u =>
bsu.X == u.X && bsu.Y == u.Y)));
}
public State(BlockShape container, List <BlockShape> pieces)
{
this.container = container;
this.pieces = pieces;
}