124 lines
3.6 KiB
JavaScript
124 lines
3.6 KiB
JavaScript
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var skewb_scrambler = (function(circle) {
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function l(a, c) {
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var ax = a % 12;
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a = ~~(a / 12);
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for (var e = [], j = 5517840, f = 0, b = 0; 5 > b; b++) {
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var h = k[5 - b],
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d = ~~ (a / h),
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f = f ^ d;
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a = a - d * h;
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d = d << 2;
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e[b] = j >> d & 15;
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h = (1 << d) - 1;
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j = (j & h) + (j >> 4 & ~h)
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}
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0 == (f & 1) ? e[5] = j: (e[5] = e[4], e[4] = j);
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0 == c && circle(e, 0, 3, 1);
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2 == c && circle(e, 1, 5, 2);
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1 == c && circle(e, 0, 2, 4);
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3 == c && circle(e, 3, 4, 5);
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a = 0;
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j = 5517840;
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for (b = 0; 4 > b; b++) d = e[b] << 2,
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a *= 6 - b,
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a += j >> d & 15,
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j -= 1118480 << d;
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return a * 12 + cornerpermmv[ax][c];
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}
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function i(idx, move) {
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var fixedtwst = [];
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var twst = [];
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for (var i = 0; i < 4; i++) {
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fixedtwst[i] = idx % 3;
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idx = ~~(idx / 3);
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}
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for (var i = 0; i < 3; i++) {
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twst[i] = idx % 3;
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idx = ~~(idx / 3);
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}
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twst[3] = (6 - twst[0] - twst[1] - twst[2]) % 3;
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fixedtwst[move] = (fixedtwst[move] + 1) % 3;
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var t;
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switch (move) {
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case 0:
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t = twst[0];
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twst[0] = twst[2] + 2;
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twst[2] = twst[1] + 2;
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twst[1] = t + 2;
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break;
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case 1:
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t = twst[0];
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twst[0] = twst[1] + 2;
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twst[1] = twst[3] + 2;
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twst[3] = t + 2;
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break;
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case 2:
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t = twst[0];
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twst[0] = twst[3] + 2;
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twst[3] = twst[2] + 2;
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twst[2] = t + 2;
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break;
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case 3:
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t = twst[1];
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twst[1] = twst[2] + 2;
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twst[2] = twst[3] + 2;
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twst[3] = t + 2;
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break;
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default:
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}
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for (var i = 2; i >= 0; i--) {
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idx = idx * 3 + twst[i] % 3;
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}
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for (var i = 3; i >= 0; i--) {
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idx = idx * 3 + fixedtwst[i];
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}
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return idx;
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}
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var k = [1, 1, 1, 3, 12, 60, 360];
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var cornerpermmv = [[ 6, 5, 10, 1 ], [ 9, 7, 4, 2 ], [ 3, 11, 8, 0 ], [ 10, 1, 6, 5 ],
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[ 0, 8, 11, 3 ], [ 7, 9, 2, 4 ], [ 4, 2, 9, 7 ], [ 11, 3, 0, 8 ],
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[ 1, 10, 5, 6 ], [ 8, 0, 3, 11 ], [ 2, 4, 7, 9 ], [ 5, 6, 1, 10 ] ];
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var solv = new mathlib.Solver(4, 2, [[0, l, 4320], [0, i, 2187]]);
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function getSolution(sol) {
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var ret = [];
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var move2str = ["L", "R", "B", "U"];//RLDB (in jaap's notation) rotated by z2
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for (var i = 0; i < sol.length; i++) {
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var axis = sol[i][0];
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var pow = 1 - sol[i][1];
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if (axis == 2) {//step two.
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for (var p=0; p<=pow; p++) {
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var temp = move2str[0];
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move2str[0] = move2str[1];
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move2str[1] = move2str[3];
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move2str[3] = temp;
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}
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}
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ret.push(move2str[axis] + ((pow == 1) ? "'" : ""));
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}
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return ret.join(" ");
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}
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var ori = [0, 1, 2, 0, 2, 1, 1, 2, 0, 2, 1, 0];
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function getScramble(type) {
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var perm, twst, lim = 5,
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l = type == 'skbso' ? 8 : 0;
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do {
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perm = mathlib.rn(4320);
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twst = mathlib.rn(2187);
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} while (perm == 0 && twst == 0 || ori[perm % 12] != (twst + ~~(twst / 3) + ~~(twst / 9) + ~~(twst / 27)) % 3 || solv.search([perm, twst], lim, lim) != null);
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var sol = solv.search([perm, twst], l).reverse();
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return getSolution(sol);
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}
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function getSkewbWCAScramble(){
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return getScramble('skbso');
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}
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return {
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getSkewbWCAScramble: getSkewbWCAScramble
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}
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//scramble.reg(['skbo', 'skbso'], getScramble);
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})(mathlib.circle);
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