89 lines
2.5 KiB
JavaScript
89 lines
2.5 KiB
JavaScript
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var scrambler223 = (function(circle, get8Perm) {
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var cmv = [];
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var cprun = [];
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function initCornerMoveTable() {
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var g = [],
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temp;
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for (var i = 0; i < 40320; i++) {
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cmv[i] = [];
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}
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for (var i = 0; i < 40320; i++) {
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mathlib.set8Perm(g, i);
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circle(g, 0, 1, 2, 3);
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temp = cmv[0][i] = get8Perm(g); //U
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circle(g, 4, 5, 6, 7);
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temp = cmv[1][temp] = get8Perm(g); //D
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circle(g, 2, 5)(g, 3, 6);
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temp = cmv[2][temp] = get8Perm(g); //R
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circle(g, 0, 5)(g, 3, 4);
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cmv[3][temp] = get8Perm(g); //F
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}
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}
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function doEdgeMove(idx, m) {
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if (m < 2) {
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return idx;
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}
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var g = [];
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mathlib.set8Perm(g, idx, 3);
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if (m == 2) {
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circle(g, 0, 1);
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} else if (m == 3) {
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circle(g, 0, 2);
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}
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return get8Perm(g, 3);
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}
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// function doMv(idx, m) {
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// return cmv[~~(idx / 6)][m] * 6 + doEdgeMove(idx % 6, m);
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// }
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function init() {
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initCornerMoveTable();
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mathlib.createPrun(cprun, 0, 40320, 12, cmv, 4, 3);
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// mathlib.createPrun([], 0, 40320 * 6, 15, doMv, 4, 3);
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}
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function search(corner, edge, maxl, lm, sol) {
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if (maxl == 0) {
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return corner + edge == 0;
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}
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if (mathlib.getPruning(cprun, corner) > maxl) return false;
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var h, g, f, i;
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for (i = 0; i < 4; i++) {
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if (i != lm) {
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h = corner;
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g = edge;
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for (f = 0; f < (i < 2 ? 3 : 1); f++) {
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h = cmv[i][h];
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g = doEdgeMove(g, i);
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if (search(h, g, maxl - 1, i, sol)) {
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sol.push(["U", "D", "R2", "F2"][i] + (i < 2 ? " 2'".charAt(f) : ""));
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return true;
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}
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}
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}
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}
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}
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function generateScramble() {
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init();
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var d = [];
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var a = 0,
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b, c;
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do {
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c = mathlib.rn(40320);
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b = mathlib.rn(6);
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} while (b + c == 0)
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for (a = 0; a < 99; a++) {
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if (search(c, b, a, -1, d)) {
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break;
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}
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}
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return d.reverse().join(" ")
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}
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return {
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get223scramble: generateScramble,
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}
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//scramble.reg('223', generateScramble);
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})(mathlib.circle, mathlib.get8Perm);
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