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<pre class="prettyprint lang-js">// @tag foundation,core
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// @require String.js
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// @define Ext.Number
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<span id='Ext-Number'>/**
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</span> * @class Ext.Number
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*
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* A collection of useful static methods to deal with numbers
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* @singleton
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*/
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Ext.Number = new function() {
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var me = this,
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isToFixedBroken = (0.9).toFixed() !== '1',
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math = Math;
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Ext.apply(this, {
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<span id='Ext-Number-method-constrain'> /**
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</span> * Checks whether or not the passed number is within a desired range. If the number is already within the
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* range it is returned, otherwise the min or max value is returned depending on which side of the range is
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* exceeded. Note that this method returns the constrained value but does not change the current number.
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* @param {Number} number The number to check
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* @param {Number} min The minimum number in the range
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* @param {Number} max The maximum number in the range
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* @return {Number} The constrained value if outside the range, otherwise the current value
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*/
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constrain: function(number, min, max) {
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var x = parseFloat(number);
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// Watch out for NaN in Chrome 18
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// V8bug: http://code.google.com/p/v8/issues/detail?id=2056
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// Operators are faster than Math.min/max. See http://jsperf.com/number-constrain
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// ... and (x < Nan) || (x < undefined) == false
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// ... same for (x > NaN) || (x > undefined)
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// so if min or max are undefined or NaN, we never return them... sadly, this
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// is not true of null (but even Math.max(-1,null)==0 and isNaN(null)==false)
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return (x < min) ? min : ((x > max) ? max : x);
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},
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<span id='Ext-Number-method-snap'> /**
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</span> * Snaps the passed number between stopping points based upon a passed increment value.
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*
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* The difference between this and {@link #snapInRange} is that {@link #snapInRange} uses the minValue
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* when calculating snap points:
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*
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* r = Ext.Number.snap(56, 2, 55, 65); // Returns 56 - snap points are zero based
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*
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* r = Ext.Number.snapInRange(56, 2, 55, 65); // Returns 57 - snap points are based from minValue
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*
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* @param {Number} value The unsnapped value.
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* @param {Number} increment The increment by which the value must move.
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* @param {Number} minValue The minimum value to which the returned value must be constrained. Overrides the increment.
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* @param {Number} maxValue The maximum value to which the returned value must be constrained. Overrides the increment.
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* @return {Number} The value of the nearest snap target.
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*/
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snap : function(value, increment, minValue, maxValue) {
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var m;
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// If no value passed, or minValue was passed and value is less than minValue (anything < undefined is false)
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// Then use the minValue (or zero if the value was undefined)
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if (value === undefined || value < minValue) {
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return minValue || 0;
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}
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if (increment) {
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m = value % increment;
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if (m !== 0) {
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value -= m;
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if (m * 2 >= increment) {
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value += increment;
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} else if (m * 2 < -increment) {
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value -= increment;
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}
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}
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}
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return me.constrain(value, minValue, maxValue);
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},
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<span id='Ext-Number-method-snapInRange'> /**
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</span> * Snaps the passed number between stopping points based upon a passed increment value.
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*
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* The difference between this and {@link #snap} is that {@link #snap} does not use the minValue
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* when calculating snap points:
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*
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* r = Ext.Number.snap(56, 2, 55, 65); // Returns 56 - snap points are zero based
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*
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* r = Ext.Number.snapInRange(56, 2, 55, 65); // Returns 57 - snap points are based from minValue
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*
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* @param {Number} value The unsnapped value.
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* @param {Number} increment The increment by which the value must move.
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* @param {Number} [minValue=0] The minimum value to which the returned value must be constrained.
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* @param {Number} [maxValue=Infinity] The maximum value to which the returned value must be constrained.
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* @return {Number} The value of the nearest snap target.
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*/
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snapInRange : function(value, increment, minValue, maxValue) {
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var tween;
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// default minValue to zero
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minValue = (minValue || 0);
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// If value is undefined, or less than minValue, use minValue
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if (value === undefined || value < minValue) {
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return minValue;
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}
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// Calculate how many snap points from the minValue the passed value is.
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if (increment && (tween = ((value - minValue) % increment))) {
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value -= tween;
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tween *= 2;
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if (tween >= increment) {
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value += increment;
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}
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}
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// If constraining within a maximum, ensure the maximum is on a snap point
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if (maxValue !== undefined) {
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if (value > (maxValue = me.snapInRange(maxValue, increment, minValue))) {
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value = maxValue;
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}
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}
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return value;
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},
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<span id='Ext-Number-method-toFixed'> /**
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</span> * Formats a number using fixed-point notation
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* @param {Number} value The number to format
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* @param {Number} precision The number of digits to show after the decimal point
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*/
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toFixed: isToFixedBroken ? function(value, precision) {
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precision = precision || 0;
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var pow = math.pow(10, precision);
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return (math.round(value * pow) / pow).toFixed(precision);
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} : function(value, precision) {
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return value.toFixed(precision);
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},
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<span id='Ext-Number-method-from'> /**
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</span> * Validate that a value is numeric and convert it to a number if necessary. Returns the specified default value if
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* it is not.
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Ext.Number.from('1.23', 1); // returns 1.23
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Ext.Number.from('abc', 1); // returns 1
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* @param {Object} value
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* @param {Number} defaultValue The value to return if the original value is non-numeric
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* @return {Number} value, if numeric, defaultValue otherwise
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*/
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from: function(value, defaultValue) {
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if (isFinite(value)) {
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value = parseFloat(value);
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}
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return !isNaN(value) ? value : defaultValue;
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},
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<span id='Ext-Number-method-randomInt'> /**
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</span> * Returns a random integer between the specified range (inclusive)
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* @param {Number} from Lowest value to return.
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* @param {Number} to Highst value to return.
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* @return {Number} A random integer within the specified range.
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*/
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randomInt: function (from, to) {
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return math.floor(math.random() * (to - from + 1) + from);
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},
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<span id='Ext-Number-method-correctFloat'> /**
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</span> * Corrects floating point numbers that overflow to a non-precise
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* value because of their floating nature, for example `0.1 + 0.2`
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* @param {Number} The number
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* @return {Number} The correctly rounded number
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*/
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correctFloat: function(n) {
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// This is to correct the type of errors where 2 floats end with
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// a long string of decimals, eg 0.1 + 0.2. When they overflow in this
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// manner, they usually go to 15-16 decimals, so we cut it off at 14.
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return parseFloat(n.toPrecision(14));
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}
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});
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<span id='Ext-method-num'> /**
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</span> * @deprecated 4.0.0 Please use {@link Ext.Number#from} instead.
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* @member Ext
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* @method num
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* @inheritdoc Ext.Number#from
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*/
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Ext.num = function() {
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return me.from.apply(this, arguments);
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};
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};</pre>
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