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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';
/**
* @fileoverview Quick range computations.
*/
base.exportTo('base', function() {
function Range() {
this.isEmpty_ = true;
this.min_ = undefined;
this.max_ = undefined;
};
Range.prototype = {
__proto__: Object.prototype,
reset: function() {
this.isEmpty_ = true;
this.min_ = undefined;
this.max_ = undefined;
},
get isEmpty() {
return this.isEmpty_;
},
addRange: function(range) {
if (range.isEmpty)
return;
this.addValue(range.min);
this.addValue(range.max);
},
addValue: function(value) {
if (this.isEmpty_) {
this.max_ = value;
this.min_ = value;
this.isEmpty_ = false;
return;
}
this.max_ = Math.max(this.max_, value);
this.min_ = Math.min(this.min_, value);
},
get min() {
if (this.isEmpty_)
return undefined;
return this.min_;
},
get max() {
if (this.isEmpty_)
return undefined;
return this.max_;
},
get range() {
if (this.isEmpty_)
return undefined;
return this.max_ - this.min_;
},
get center() {
return (this.min_ + this.max_) * 0.5;
},
equals: function(that) {
if (this.isEmpty && that.isEmpty)
return true;
if (this.isEmpty != that.isEmpty)
return false;
return this.min === that.min &&
this.max === that.max;
}
};
Range.compareByMinTimes = function(a, b) {
if (!a.isEmpty && !b.isEmpty)
return a.min_ - b.min_;
if (a.isEmpty && !b.isEmpty)
return -1;
if (!a.isEmpty && b.isEmpty)
return 1;
return 0;
};
return {
Range: Range
};
});
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