85 lines
1.9 KiB
JavaScript
85 lines
1.9 KiB
JavaScript
goog.provide('ol.size');
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goog.require('goog.asserts');
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/**
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* Returns a buffered size.
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* @param {ol.Size} size Size.
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* @param {number} buffer Buffer.
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* @param {ol.Size=} opt_size Optional reusable size array.
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* @return {ol.Size} The buffered size.
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*/
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ol.size.buffer = function(size, buffer, opt_size) {
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if (opt_size === undefined) {
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opt_size = [0, 0];
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}
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opt_size[0] = size[0] + 2 * buffer;
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opt_size[1] = size[1] + 2 * buffer;
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return opt_size;
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};
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/**
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* Compares sizes for equality.
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* @param {ol.Size} a Size.
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* @param {ol.Size} b Size.
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* @return {boolean} Equals.
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*/
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ol.size.equals = function(a, b) {
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return a[0] == b[0] && a[1] == b[1];
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};
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/**
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* Determines if a size has a positive area.
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* @param {ol.Size} size The size to test.
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* @return {boolean} The size has a positive area.
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*/
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ol.size.hasArea = function(size) {
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return size[0] > 0 && size[1] > 0;
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};
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/**
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* Returns a size scaled by a ratio. The result will be an array of integers.
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* @param {ol.Size} size Size.
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* @param {number} ratio Ratio.
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* @param {ol.Size=} opt_size Optional reusable size array.
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* @return {ol.Size} The scaled size.
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*/
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ol.size.scale = function(size, ratio, opt_size) {
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if (opt_size === undefined) {
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opt_size = [0, 0];
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}
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opt_size[0] = (size[0] * ratio + 0.5) | 0;
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opt_size[1] = (size[1] * ratio + 0.5) | 0;
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return opt_size;
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};
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/**
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* Returns an `ol.Size` array for the passed in number (meaning: square) or
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* `ol.Size` array.
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* (meaning: non-square),
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* @param {number|ol.Size} size Width and height.
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* @param {ol.Size=} opt_size Optional reusable size array.
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* @return {ol.Size} Size.
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* @api stable
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*/
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ol.size.toSize = function(size, opt_size) {
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if (Array.isArray(size)) {
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return size;
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} else {
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goog.asserts.assert(typeof size === 'number');
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if (opt_size === undefined) {
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opt_size = [size, size];
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} else {
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opt_size[0] = size;
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opt_size[1] = size;
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}
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return opt_size;
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}
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};
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