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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview A utility class for representing two-dimensional sizes.
* @author brenneman@google.com (Shawn Brenneman)
*/
goog.provide('goog.math.Size');
/**
* Class for representing sizes consisting of a width and height. Undefined
* width and height support is deprecated and results in compiler warning.
* @param {number} width Width.
* @param {number} height Height.
* @struct
* @constructor
*/
goog.math.Size = function(width, height) {
/**
* Width
* @type {number}
*/
this.width = width;
/**
* Height
* @type {number}
*/
this.height = height;
};
/**
* Compares sizes for equality.
* @param {goog.math.Size} a A Size.
* @param {goog.math.Size} b A Size.
* @return {boolean} True iff the sizes have equal widths and equal
* heights, or if both are null.
*/
goog.math.Size.equals = function(a, b) {
if (a == b) {
return true;
}
if (!a || !b) {
return false;
}
return a.width == b.width && a.height == b.height;
};
/**
* @return {!goog.math.Size} A new copy of the Size.
*/
goog.math.Size.prototype.clone = function() {
return new goog.math.Size(this.width, this.height);
};
if (goog.DEBUG) {
/**
* Returns a nice string representing size.
* @return {string} In the form (50 x 73).
* @override
*/
goog.math.Size.prototype.toString = function() {
return '(' + this.width + ' x ' + this.height + ')';
};
}
/**
* @return {number} The longer of the two dimensions in the size.
*/
goog.math.Size.prototype.getLongest = function() {
return Math.max(this.width, this.height);
};
/**
* @return {number} The shorter of the two dimensions in the size.
*/
goog.math.Size.prototype.getShortest = function() {
return Math.min(this.width, this.height);
};
/**
* @return {number} The area of the size (width * height).
*/
goog.math.Size.prototype.area = function() {
return this.width * this.height;
};
/**
* @return {number} The perimeter of the size (width + height) * 2.
*/
goog.math.Size.prototype.perimeter = function() {
return (this.width + this.height) * 2;
};
/**
* @return {number} The ratio of the size's width to its height.
*/
goog.math.Size.prototype.aspectRatio = function() {
return this.width / this.height;
};
/**
* @return {boolean} True if the size has zero area, false if both dimensions
* are non-zero numbers.
*/
goog.math.Size.prototype.isEmpty = function() {
return !this.area();
};
/**
* Clamps the width and height parameters upward to integer values.
* @return {!goog.math.Size} This size with ceil'd components.
*/
goog.math.Size.prototype.ceil = function() {
this.width = Math.ceil(this.width);
this.height = Math.ceil(this.height);
return this;
};
/**
* @param {!goog.math.Size} target The target size.
* @return {boolean} True if this Size is the same size or smaller than the
* target size in both dimensions.
*/
goog.math.Size.prototype.fitsInside = function(target) {
return this.width <= target.width && this.height <= target.height;
};
/**
* Clamps the width and height parameters downward to integer values.
* @return {!goog.math.Size} This size with floored components.
*/
goog.math.Size.prototype.floor = function() {
this.width = Math.floor(this.width);
this.height = Math.floor(this.height);
return this;
};
/**
* Rounds the width and height parameters to integer values.
* @return {!goog.math.Size} This size with rounded components.
*/
goog.math.Size.prototype.round = function() {
this.width = Math.round(this.width);
this.height = Math.round(this.height);
return this;
};
/**
* Scales this size by the given scale factors. The width and height are scaled
* by {@code sx} and {@code opt_sy} respectively. If {@code opt_sy} is not
* given, then {@code sx} is used for both the width and height.
* @param {number} sx The scale factor to use for the width.
* @param {number=} opt_sy The scale factor to use for the height.
* @return {!goog.math.Size} This Size object after scaling.
*/
goog.math.Size.prototype.scale = function(sx, opt_sy) {
var sy = goog.isNumber(opt_sy) ? opt_sy : sx;
this.width *= sx;
this.height *= sy;
return this;
};
/**
* Uniformly scales the size to perfectly cover the dimensions of a given size.
* If the size is already larger than the target, it will be scaled down to the
* minimum size at which it still covers the entire target. The original aspect
* ratio will be preserved.
*
* This function assumes that both Sizes contain strictly positive dimensions.
* @param {!goog.math.Size} target The target size.
* @return {!goog.math.Size} This Size object, after optional scaling.
*/
goog.math.Size.prototype.scaleToCover = function(target) {
var s = this.aspectRatio() <= target.aspectRatio() ?
target.width / this.width :
target.height / this.height;
return this.scale(s);
};
/**
* Uniformly scales the size to fit inside the dimensions of a given size. The
* original aspect ratio will be preserved.
*
* This function assumes that both Sizes contain strictly positive dimensions.
* @param {!goog.math.Size} target The target size.
* @return {!goog.math.Size} This Size object, after optional scaling.
*/
goog.math.Size.prototype.scaleToFit = function(target) {
var s = this.aspectRatio() > target.aspectRatio() ?
target.width / this.width :
target.height / this.height;
return this.scale(s);
};
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