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@@ -0,0 +1,34 @@
+'use strict';
+
+/**
+ * @alias Chart.helpers.math
+ * @namespace
+ */
+var exports = {
+ /**
+ * Returns an array of factors sorted from 1 to sqrt(value)
+ * @private
+ */
+ _factorize: function(value) {
+ var result = [];
+ var sqrt = Math.sqrt(value);
+ var i;
+
+ for (i = 1; i < sqrt; i++) {
+ if (value % i === 0) {
+ result.push(i);
+ result.push(value / i);
+ }
+ }
+ if (sqrt === (sqrt | 0)) { // if value is a square number
+ result.push(sqrt);
+ }
+
+ result.sort(function(a, b) {
+ return a - b;
+ }).pop();
+ return result;
+ }
+};
+
+module.exports = exports;

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@@ -4,3 +4,4 @@ module.exports = require('./helpers.core');
 module.exports.easing = require('./helpers.easing');
 module.exports.canvas = require('./helpers.canvas');
 module.exports.options = require('./helpers.options');
+module.exports.math = require('./helpers.math');

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@@ -6,6 +6,7 @@ var helpers = require('../helpers/index');
 var Scale = require('../core/core.scale');
 
 var valueOrDefault = helpers.valueOrDefault;
+var factorize = helpers.math._factorize;
 
 // Integer constants are from the ES6 spec.
 var MIN_INTEGER = Number.MIN_SAFE_INTEGER || -9007199254740991;
@@ -15,42 +16,42 @@ var INTERVALS = {
  millisecond: {
  common: true,
  size: 1,
- steps: [1, 2, 5, 10, 20, 50, 100, 250, 500]
+ steps: factorize(1000)
  },
  second: {
  common: true,
  size: 1000,
- steps: [1, 2, 5, 10, 15, 30]
+ steps: factorize(60)
  },
  minute: {
  common: true,
  size: 60000,
- steps: [1, 2, 5, 10, 15, 30]
+ steps: factorize(60)
  },
  hour: {
  common: true,
  size: 3600000,
- steps: [1, 2, 3, 6, 12]
+ steps: factorize(24)
  },
  day: {
  common: true,
  size: 86400000,
- steps: [1, 2, 5]
+ steps: factorize(10)
  },
  week: {
  common: false,
  size: 604800000,
- steps: [1, 2, 3, 4]
+ steps: factorize(4)
  },
  month: {
  common: true,
  size: 2.628e9,
- steps: [1, 2, 3]
+ steps: factorize(12)
  },
  quarter: {
  common: false,
  size: 7.884e9,
- steps: [1, 2, 3, 4]
+ steps: factorize(4)
  },
  year: {
  common: true,

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@@ -0,0 +1,16 @@
+'use strict';
+
+describe('Chart.helpers.math', function() {
+ var factorize = Chart.helpers.math._factorize;
+
+ it('should factorize', function() {
+ expect(factorize(1000)).toEqual([1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500]);
+ expect(factorize(60)).toEqual([1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30]);
+ expect(factorize(30)).toEqual([1, 2, 3, 5, 6, 10, 15]);
+ expect(factorize(24)).toEqual([1, 2, 3, 4, 6, 8, 12]);
+ expect(factorize(12)).toEqual([1, 2, 3, 4, 6]);
+ expect(factorize(4)).toEqual([1, 2]);
+ expect(factorize(-1)).toEqual([]);
+ expect(factorize(2.76)).toEqual([]);
+ });
+});