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s2-geometry.js
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#6 fix padding issue converting from CellId to Hilbert Quadkey

This commit is contained in:
AJ ONeal 2016-07-29 09:07:52 -04:00
parent 51b549de38
commit e461dcfd5c
1 changed files with 7 additions and 2 deletions
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9
src/s2geometry.js
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@ -316,7 +316,7 @@ S2.S2Cell.prototype.getNeighbors = function() {
//
S2.FACE_BITS = 3;
S2.MAX_LEVEL = 30;
S2.POS_BITS = (2 * S2.MAX_LEVEL) + 1;
S2.POS_BITS = (2 * S2.MAX_LEVEL) + 1; // 61 (60 bits of data, 1 bit lsb marker)
S2.fromFacePosLevel = function (faceN, posS, levelN) {
var Long = exports.dcodeIO && exports.dcodeIO.Long || require('long');
@ -354,8 +354,13 @@ S2.toId = S2.toCellId = S2.fromKey = function (key) {
S2.toKey = S2.fromId = S2.fromCellId = S2.toHilbertQuadkey = function (idS) {
var Long = exports.dcodeIO && exports.dcodeIO.Long || require('long');
var bin = Long.fromString(idS, true, 10).toString(2);
var lsbIndex = bin.lastIndexOf('1');
while (bin.length < (S2.FACE_BITS + S2.POS_BITS)) {
bin = '0' + bin;
}
// MUST come AFTER binstr has been left-padded with '0's
var lsbIndex = bin.lastIndexOf('1');
// substr(start, len)
// substring(start, end)
var faceB = bin.substr(0, 3);