46 lines
1001 B
Swift
46 lines
1001 B
Swift
final class Knight: Piece {
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override var unicodeRepresentation: String {
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return color == .Black ? "♞" : "♘"
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}
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override var pseudoLegalPositions: [Square.Position] {
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[
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position + (2, 1),
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position + (2, -1),
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position + (-2, 1),
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position + (-2, -1),
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position + (1, 2),
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position + (1, -2),
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position + (-1, 2),
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position + (-1, -2),
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].filter { $0.index != nil }
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}
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override var legalPositions: [Square.Position] {
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return pseudoLegalPositions.filter { isLegal(on: $0) }
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}
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override func move(to dst: Square.Position) {
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}
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override func isLegal(on pos: Square.Position) -> Bool {
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if let board = board, let s = board[pos] {
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if let p = s.piece {
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if p.color == color { return false }
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if p.kind == .King {
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// TODO: Notify board of check
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delegate?.notify(.kingInCheck(self))
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return false
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}
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}
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}
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return true
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}
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init(with color: Color, on position: Square.Position) {
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super.init(kind: .Knight, on: position, with: color)
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}
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}
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