30:[] 2e:{"title":"Chess Moves","cells":[{"id":0,"value":"md`# Chess Moves\n\nPattern generated by a random game of chess.`","pinned":false,"hidden":false,"mode":"ojs"},{"id":1042,"value":"viewof rematch = html``","pinned":false,"hidden":false,"mode":"ojs"},{"id":135,"value":"svg``","pinned":false,"hidden":false,"mode":"ojs"},{"id":1257,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs"},{"id":10,"value":"game = {\n rematch;\n const game = new Chess();\n while (!game.game_over()) {\n const moves = game.moves();\n game.move(moves[Math.floor(Math.random() * moves.length)]);\n }\n return game;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":1002,"value":"html`${game.in_draw()\n ? `It's a draw!`\n : `${game.turn() === 'b' ? 'White' : 'Black'} wins! 🎉`}`","pinned":false,"hidden":false,"mode":"ojs"},{"id":1137,"value":"total_moves = Math.ceil(game_history.length / 2)","pinned":false,"hidden":false,"mode":"ojs"},{"id":566,"value":"pgn = game.pgn()","pinned":false,"hidden":false,"mode":"ojs"},{"id":1106,"value":"fen = game.fen()","pinned":false,"hidden":false,"mode":"ojs"},{"id":1133,"value":"game_history = game.history({ verbose: true })","pinned":false,"hidden":false,"mode":"ojs"},{"id":1224,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs"},{"id":223,"value":"board_size = Math.min(500, width)","pinned":false,"hidden":false,"mode":"ojs"},{"id":847,"value":"margin = board_size / 100","pinned":false,"hidden":false,"mode":"ojs"},{"id":226,"value":"square_size = (board_size - (margin * 2)) / 8","pinned":false,"hidden":false,"mode":"ojs"},{"id":811,"value":"subsquare_base = 6","pinned":false,"hidden":false,"mode":"ojs"},{"id":814,"value":"subsquare_size = square_size / subsquare_base","pinned":false,"hidden":false,"mode":"ojs"},{"id":56,"value":"line_width = board_size / 30","pinned":false,"hidden":false,"mode":"ojs"},{"id":775,"value":"stroke_width = board_size / 166","pinned":false,"hidden":false,"mode":"ojs"},{"id":1221,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs"},{"id":862,"value":"files = 'abcdefgh'.split('')","pinned":false,"hidden":false,"mode":"ojs"},{"id":865,"value":"starting_squares = [8, 7, 2, 1].flatMap(rank => files.map(file => `${file}${rank}`))","pinned":false,"hidden":false,"mode":"ojs"},{"id":589,"value":"piece_types = new Map(['p', 'n', 'b', 'r', 'q', 'k'].map((p, i) => [p, i]))","pinned":false,"hidden":false,"mode":"ojs"},{"id":1252,"value":"castle_flag_regex = new RegExp(`${game.FLAGS.QSIDE_CASTLE}|${game.FLAGS.KSIDE_CASTLE}`)","pinned":false,"hidden":false,"mode":"ojs"},{"id":1213,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs"},{"id":76,"value":"piece_moves = set_piece_ids(game_history\n .map(move => Object.assign({}, move))\n .flatMap(move => (castle_flag_regex.test(move.flags))\n ? [move, get_castled_rook_move(move)]\n : [move]))","pinned":false,"hidden":false,"mode":"ojs"},{"id":138,"value":"pieces = d3.groups(piece_moves, m => m.id)\n .map(([id, moves]) => ({\n id,\n piece: moves[0].piece,\n color: moves[0].color,\n states: [\n [...square_to_coords(moves[0].from), moves[0].piece],\n ...moves.map(move => [...square_to_coords(move.to), move.piece]),\n ],\n }))","pinned":false,"hidden":false,"mode":"ojs"},{"id":1184,"value":"paths = pieces\n .map(({ id, piece, color, states }) => ({\n offset: piece_offset(id),\n color: schemes[Number(color === game.BLACK)](piece_types.get(piece)),\n points: states\n .flatMap((state, i) => state[2] !== game.KNIGHT || !i\n ? [state]\n : [[state[0], states[i - 1][1]], state])\n .map(([file, rank]) => [x(file), y(rank)]),\n }))","pinned":false,"hidden":false,"mode":"ojs"},{"id":1218,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs"},{"id":1143,"value":"get_castled_rook_move = move => Object.assign({}, move, {\n from: `${move.flags === game.FLAGS.KSIDE_CASTLE ? 'h' : 'a'}${move.to[1]}`,\n to: `${move.flags === game.FLAGS.KSIDE_CASTLE ? 'f' : 'd'}${move.to[1]}`,\n piece: 'r',\n})","pinned":false,"hidden":false,"mode":"ojs"},{"id":1148,"value":"set_piece_ids = (moves) => {\n starting_squares.forEach((square, id) => {\n let lastSquare = square;\n for (let i = 0; i < moves.length; i += 1) {\n const move = moves[i];\n if (move.to === lastSquare) break;\n if (move.from !== lastSquare) continue;\n lastSquare = move.to;\n move.id = id;\n if (moves[i + 1] && moves[i + 1].flags === game.FLAGS.EP_CAPTURE) break;\n }\n });\n\n return moves;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":143,"value":"square_to_coords = square =>\n square.split('').map((str, i) => parseInt(str, i ? 10 : 36) - (i ? 0 : 9))","pinned":false,"hidden":false,"mode":"ojs"},{"id":320,"value":"piece_offset = id =>\n [(id % subsquare_base) + 1, Math.ceil((id + 1) / subsquare_base)]\n .map(n => (n * subsquare_size) - (subsquare_size * 0.5))","pinned":false,"hidden":false,"mode":"ojs"},{"id":1228,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs"},{"id":246,"value":"x = n => (n - 1) * square_size","pinned":false,"hidden":false,"mode":"ojs"},{"id":256,"value":"y = n => (8 - n) * square_size","pinned":false,"hidden":false,"mode":"ojs"},{"id":294,"value":"schemes = [d3.schemeOranges, d3.schemeBlues]\n .map(scheme => n => scheme[9][n])","pinned":false,"hidden":false,"mode":"ojs"},{"id":1124,"value":"md`---`","pinned":false,"hidden":false,"mode":"ojs"},{"id":2,"value":"Chess = require('chess.js@^0.10.3')","pinned":false,"hidden":false,"mode":"ojs"},{"id":48,"value":"d3 = require('d3-scale-chromatic@^1.4.0', 'd3-array@^2.2')","pinned":false,"hidden":false,"mode":"ojs"},{"id":1012,"value":"import { select } from '@jashkenas/inputs'","pinned":false,"hidden":false,"mode":"ojs"}],"files":"$W30","stdlib":"1","titling":"auto"}