cesium
Version:
CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.
296 lines (260 loc) • 10.2 kB
JavaScript
define([
'./defaultValue',
'./defined',
'./Fullscreen'
], function(
defaultValue,
defined,
Fullscreen) {
'use strict';
/*global CanvasPixelArray*/
var theNavigator;
if (typeof navigator !== 'undefined') {
theNavigator = navigator;
} else {
theNavigator = {};
}
function extractVersion(versionString) {
var parts = versionString.split('.');
for (var i = 0, len = parts.length; i < len; ++i) {
parts[i] = parseInt(parts[i], 10);
}
return parts;
}
var isChromeResult;
var chromeVersionResult;
function isChrome() {
if (!defined(isChromeResult)) {
isChromeResult = false;
// Edge contains Chrome in the user agent too
if (!isEdge()) {
var fields = (/ Chrome\/([\.0-9]+)/).exec(theNavigator.userAgent);
if (fields !== null) {
isChromeResult = true;
chromeVersionResult = extractVersion(fields[1]);
}
}
}
return isChromeResult;
}
function chromeVersion() {
return isChrome() && chromeVersionResult;
}
var isSafariResult;
var safariVersionResult;
function isSafari() {
if (!defined(isSafariResult)) {
isSafariResult = false;
// Chrome and Edge contain Safari in the user agent too
if (!isChrome() && !isEdge() && (/ Safari\/[\.0-9]+/).test(theNavigator.userAgent)) {
var fields = (/ Version\/([\.0-9]+)/).exec(theNavigator.userAgent);
if (fields !== null) {
isSafariResult = true;
safariVersionResult = extractVersion(fields[1]);
}
}
}
return isSafariResult;
}
function safariVersion() {
return isSafari() && safariVersionResult;
}
var isWebkitResult;
var webkitVersionResult;
function isWebkit() {
if (!defined(isWebkitResult)) {
isWebkitResult = false;
var fields = (/ AppleWebKit\/([\.0-9]+)(\+?)/).exec(theNavigator.userAgent);
if (fields !== null) {
isWebkitResult = true;
webkitVersionResult = extractVersion(fields[1]);
webkitVersionResult.isNightly = !!fields[2];
}
}
return isWebkitResult;
}
function webkitVersion() {
return isWebkit() && webkitVersionResult;
}
var isInternetExplorerResult;
var internetExplorerVersionResult;
function isInternetExplorer() {
if (!defined(isInternetExplorerResult)) {
isInternetExplorerResult = false;
var fields;
if (theNavigator.appName === 'Microsoft Internet Explorer') {
fields = /MSIE ([0-9]{1,}[\.0-9]{0,})/.exec(theNavigator.userAgent);
if (fields !== null) {
isInternetExplorerResult = true;
internetExplorerVersionResult = extractVersion(fields[1]);
}
} else if (theNavigator.appName === 'Netscape') {
fields = /Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})/.exec(theNavigator.userAgent);
if (fields !== null) {
isInternetExplorerResult = true;
internetExplorerVersionResult = extractVersion(fields[1]);
}
}
}
return isInternetExplorerResult;
}
function internetExplorerVersion() {
return isInternetExplorer() && internetExplorerVersionResult;
}
var isEdgeResult;
var edgeVersionResult;
function isEdge() {
if (!defined(isEdgeResult)) {
isEdgeResult = false;
var fields = (/ Edge\/([\.0-9]+)/).exec(theNavigator.userAgent);
if (fields !== null) {
isEdgeResult = true;
edgeVersionResult = extractVersion(fields[1]);
}
}
return isEdgeResult;
}
function edgeVersion() {
return isEdge() && edgeVersionResult;
}
var isFirefoxResult;
var firefoxVersionResult;
function isFirefox() {
if (!defined(isFirefoxResult)) {
isFirefoxResult = false;
var fields = /Firefox\/([\.0-9]+)/.exec(theNavigator.userAgent);
if (fields !== null) {
isFirefoxResult = true;
firefoxVersionResult = extractVersion(fields[1]);
}
}
return isFirefoxResult;
}
var isWindowsResult;
function isWindows() {
if (!defined(isWindowsResult)) {
isWindowsResult = /Windows/i.test(theNavigator.appVersion);
}
return isWindowsResult;
}
function firefoxVersion() {
return isFirefox() && firefoxVersionResult;
}
var isNodeJsResult;
function isNodeJs() {
if (!defined(isNodeJsResult)) {
isNodeJsResult = typeof process === 'object' && Object.prototype.toString.call(process) === '[object process]'; // eslint-disable-line
}
return isNodeJsResult;
}
var hasPointerEvents;
function supportsPointerEvents() {
if (!defined(hasPointerEvents)) {
//While navigator.pointerEnabled is deprecated in the W3C specification
//we still need to use it if it exists in order to support browsers
//that rely on it, such as the Windows WebBrowser control which defines
//PointerEvent but sets navigator.pointerEnabled to false.
hasPointerEvents = typeof PointerEvent !== 'undefined' && (!defined(theNavigator.pointerEnabled) || theNavigator.pointerEnabled);
}
return hasPointerEvents;
}
var imageRenderingValueResult;
var supportsImageRenderingPixelatedResult;
function supportsImageRenderingPixelated() {
if (!defined(supportsImageRenderingPixelatedResult)) {
var canvas = document.createElement('canvas');
canvas.setAttribute('style',
'image-rendering: -moz-crisp-edges;' +
'image-rendering: pixelated;');
//canvas.style.imageRendering will be undefined, null or an empty string on unsupported browsers.
var tmp = canvas.style.imageRendering;
supportsImageRenderingPixelatedResult = defined(tmp) && tmp !== '';
if (supportsImageRenderingPixelatedResult) {
imageRenderingValueResult = tmp;
}
}
return supportsImageRenderingPixelatedResult;
}
function imageRenderingValue() {
return supportsImageRenderingPixelated() ? imageRenderingValueResult : undefined;
}
var typedArrayTypes = [];
if (typeof ArrayBuffer !== 'undefined') {
typedArrayTypes.push(Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array);
if (typeof Uint8ClampedArray !== 'undefined') {
typedArrayTypes.push(Uint8ClampedArray);
}
if (typeof CanvasPixelArray !== 'undefined') {
typedArrayTypes.push(CanvasPixelArray);
}
}
/**
* A set of functions to detect whether the current browser supports
* various features.
*
* @exports FeatureDetection
*/
var FeatureDetection = {
isChrome : isChrome,
chromeVersion : chromeVersion,
isSafari : isSafari,
safariVersion : safariVersion,
isWebkit : isWebkit,
webkitVersion : webkitVersion,
isInternetExplorer : isInternetExplorer,
internetExplorerVersion : internetExplorerVersion,
isEdge : isEdge,
edgeVersion : edgeVersion,
isFirefox : isFirefox,
firefoxVersion : firefoxVersion,
isWindows : isWindows,
isNodeJs: isNodeJs,
hardwareConcurrency : defaultValue(theNavigator.hardwareConcurrency, 3),
supportsPointerEvents : supportsPointerEvents,
supportsImageRenderingPixelated: supportsImageRenderingPixelated,
imageRenderingValue: imageRenderingValue,
typedArrayTypes: typedArrayTypes
};
/**
* Detects whether the current browser supports the full screen standard.
*
* @returns {Boolean} true if the browser supports the full screen standard, false if not.
*
* @see Fullscreen
* @see {@link http://dvcs.w3.org/hg/fullscreen/raw-file/tip/Overview.html|W3C Fullscreen Living Specification}
*/
FeatureDetection.supportsFullscreen = function() {
return Fullscreen.supportsFullscreen();
};
/**
* Detects whether the current browser supports typed arrays.
*
* @returns {Boolean} true if the browser supports typed arrays, false if not.
*
* @see {@link http://www.khronos.org/registry/typedarray/specs/latest/|Typed Array Specification}
*/
FeatureDetection.supportsTypedArrays = function() {
return typeof ArrayBuffer !== 'undefined';
};
/**
* Detects whether the current browser supports Web Workers.
*
* @returns {Boolean} true if the browsers supports Web Workers, false if not.
*
* @see {@link http://www.w3.org/TR/workers/}
*/
FeatureDetection.supportsWebWorkers = function() {
return typeof Worker !== 'undefined';
};
/**
* Detects whether the current browser supports Web Assembly.
*
* @returns {Boolean} true if the browsers supports Web Assembly, false if not.
*
* @see {@link https://developer.mozilla.org/en-US/docs/WebAssembly}
*/
FeatureDetection.supportsWebAssembly = function() {
return typeof WebAssembly !== 'undefined' && !FeatureDetection.isEdge();
};
return FeatureDetection;
});