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Viewing file:     core.ticks.js (6.65 KB)      -rw-r--r--

'use strict';

var helpers = require('../helpers/index');

/**
 * Namespace to hold static tick generation functions
 * @namespace Chart.Ticks
 */
module.exports = {
	/**
	 * Namespace to hold generators for different types of ticks
	 * @namespace Chart.Ticks.generators
	 */
	generators: {
		/**
		 * Interface for the options provided to the numeric tick generator
		 * @interface INumericTickGenerationOptions
		 */
		/**
		 * The maximum number of ticks to display
		 * @name INumericTickGenerationOptions#maxTicks
		 * @type Number
		 */
		/**
		 * The distance between each tick.
		 * @name INumericTickGenerationOptions#stepSize
		 * @type Number
		 * @optional
		 */
		/**
		 * Forced minimum for the ticks. If not specified, the minimum of the data range is used to calculate the tick minimum
		 * @name INumericTickGenerationOptions#min
		 * @type Number
		 * @optional
		 */
		/**
		 * The maximum value of the ticks. If not specified, the maximum of the data range is used to calculate the tick maximum
		 * @name INumericTickGenerationOptions#max
		 * @type Number
		 * @optional
		 */

		/**
		 * Generate a set of linear ticks
		 * @method Chart.Ticks.generators.linear
		 * @param generationOptions {INumericTickGenerationOptions} the options used to generate the ticks
		 * @param dataRange {IRange} the range of the data
		 * @returns {Array<Number>} array of tick values
		 */
		linear: function(generationOptions, dataRange) {
			var ticks = [];
			// To get a "nice" value for the tick spacing, we will use the appropriately named
			// "nice number" algorithm. See http://stackoverflow.com/questions/8506881/nice-label-algorithm-for-charts-with-minimum-ticks
			// for details.

			var spacing;
			if (generationOptions.stepSize && generationOptions.stepSize > 0) {
				spacing = generationOptions.stepSize;
			} else {
				var niceRange = helpers.niceNum(dataRange.max - dataRange.min, false);
				spacing = helpers.niceNum(niceRange / (generationOptions.maxTicks - 1), true);
			}
			var niceMin = Math.floor(dataRange.min / spacing) * spacing;
			var niceMax = Math.ceil(dataRange.max / spacing) * spacing;

			// If min, max and stepSize is set and they make an evenly spaced scale use it.
			if (generationOptions.min && generationOptions.max && generationOptions.stepSize) {
				// If very close to our whole number, use it.
				if (helpers.almostWhole((generationOptions.max - generationOptions.min) / generationOptions.stepSize, spacing / 1000)) {
					niceMin = generationOptions.min;
					niceMax = generationOptions.max;
				}
			}

			var numSpaces = (niceMax - niceMin) / spacing;
			// If very close to our rounded value, use it.
			if (helpers.almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
				numSpaces = Math.round(numSpaces);
			} else {
				numSpaces = Math.ceil(numSpaces);
			}

			// Put the values into the ticks array
			ticks.push(generationOptions.min !== undefined ? generationOptions.min : niceMin);
			for (var j = 1; j < numSpaces; ++j) {
				ticks.push(niceMin + (j * spacing));
			}
			ticks.push(generationOptions.max !== undefined ? generationOptions.max : niceMax);

			return ticks;
		},

		/**
		 * Generate a set of logarithmic ticks
		 * @method Chart.Ticks.generators.logarithmic
		 * @param generationOptions {INumericTickGenerationOptions} the options used to generate the ticks
		 * @param dataRange {IRange} the range of the data
		 * @returns {Array<Number>} array of tick values
		 */
		logarithmic: function(generationOptions, dataRange) {
			var ticks = [];
			var valueOrDefault = helpers.valueOrDefault;

			// Figure out what the max number of ticks we can support it is based on the size of
			// the axis area. For now, we say that the minimum tick spacing in pixels must be 50
			// We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
			// the graph
			var tickVal = valueOrDefault(generationOptions.min, Math.pow(10, Math.floor(helpers.log10(dataRange.min))));

			var endExp = Math.floor(helpers.log10(dataRange.max));
			var endSignificand = Math.ceil(dataRange.max / Math.pow(10, endExp));
			var exp, significand;

			if (tickVal === 0) {
				exp = Math.floor(helpers.log10(dataRange.minNotZero));
				significand = Math.floor(dataRange.minNotZero / Math.pow(10, exp));

				ticks.push(tickVal);
				tickVal = significand * Math.pow(10, exp);
			} else {
				exp = Math.floor(helpers.log10(tickVal));
				significand = Math.floor(tickVal / Math.pow(10, exp));
			}

			do {
				ticks.push(tickVal);

				++significand;
				if (significand === 10) {
					significand = 1;
					++exp;
				}

				tickVal = significand * Math.pow(10, exp);
			} while (exp < endExp || (exp === endExp && significand < endSignificand));

			var lastTick = valueOrDefault(generationOptions.max, tickVal);
			ticks.push(lastTick);

			return ticks;
		}
	},

	/**
	 * Namespace to hold formatters for different types of ticks
	 * @namespace Chart.Ticks.formatters
	 */
	formatters: {
		/**
		 * Formatter for value labels
		 * @method Chart.Ticks.formatters.values
		 * @param value the value to display
		 * @return {String|Array} the label to display
		 */
		values: function(value) {
			return helpers.isArray(value) ? value : '' + value;
		},

		/**
		 * Formatter for linear numeric ticks
		 * @method Chart.Ticks.formatters.linear
		 * @param tickValue {Number} the value to be formatted
		 * @param index {Number} the position of the tickValue parameter in the ticks array
		 * @param ticks {Array<Number>} the list of ticks being converted
		 * @return {String} string representation of the tickValue parameter
		 */
		linear: function(tickValue, index, ticks) {
			// If we have lots of ticks, don't use the ones
			var delta = ticks.length > 3 ? ticks[2] - ticks[1] : ticks[1] - ticks[0];

			// If we have a number like 2.5 as the delta, figure out how many decimal places we need
			if (Math.abs(delta) > 1) {
				if (tickValue !== Math.floor(tickValue)) {
					// not an integer
					delta = tickValue - Math.floor(tickValue);
				}
			}

			var logDelta = helpers.log10(Math.abs(delta));
			var tickString = '';

			if (tickValue !== 0) {
				var numDecimal = -1 * Math.floor(logDelta);
				numDecimal = Math.max(Math.min(numDecimal, 20), 0); // toFixed has a max of 20 decimal places
				tickString = tickValue.toFixed(numDecimal);
			} else {
				tickString = '0'; // never show decimal places for 0
			}

			return tickString;
		},

		logarithmic: function(tickValue, index, ticks) {
			var remain = tickValue / (Math.pow(10, Math.floor(helpers.log10(tickValue))));

			if (tickValue === 0) {
				return '0';
			} else if (remain === 1 || remain === 2 || remain === 5 || index === 0 || index === ticks.length - 1) {
				return tickValue.toExponential();
			}
			return '';
		}
	}
};