Software: Apache. PHP/5.5.15 uname -a: Windows NT SVR-DMZ 6.1 build 7600 (Windows Server 2008 R2 Enterprise Edition) i586 SYSTEM Safe-mode: OFF (not secure) C:\dmz\phpMyAdmin\js\openlayers\src\openlayers\lib\OpenLayers\ drwxrwxrwx | |
| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Console.js
*/
/**
* Namespace: Util
*/
OpenLayers.Util = {};
/**
* Function: getElement
* This is the old $() from prototype
*/
OpenLayers.Util.getElement = function() {
var elements = [];
for (var i=0, len=arguments.length; i<len; i++) {
var element = arguments[i];
if (typeof element == 'string') {
element = document.getElementById(element);
}
if (arguments.length == 1) {
return element;
}
elements.push(element);
}
return elements;
};
/**
* Function: isElement
* A cross-browser implementation of "e instanceof Element".
*
* Parameters:
* o - {Object} The object to test.
*
* Returns:
* {Boolean}
*/
OpenLayers.Util.isElement = function(o) {
return !!(o && o.nodeType === 1);
};
/**
* Maintain existing definition of $.
*/
if(typeof window.$ === "undefined") {
window.$ = OpenLayers.Util.getElement;
}
/**
* APIFunction: extend
* Copy all properties of a source object to a destination object. Modifies
* the passed in destination object. Any properties on the source object
* that are set to undefined will not be (re)set on the destination object.
*
* Parameters:
* destination - {Object} The object that will be modified
* source - {Object} The object with properties to be set on the destination
*
* Returns:
* {Object} The destination object.
*/
OpenLayers.Util.extend = function(destination, source) {
destination = destination || {};
if(source) {
for(var property in source) {
var value = source[property];
if(value !== undefined) {
destination[property] = value;
}
}
/**
* IE doesn't include the toString property when iterating over an object's
* properties with the for(property in object) syntax. Explicitly check if
* the source has its own toString property.
*/
/*
* FF/Windows < 2.0.0.13 reports "Illegal operation on WrappedNative
* prototype object" when calling hawOwnProperty if the source object
* is an instance of window.Event.
*/
var sourceIsEvt = typeof window.Event == "function"
&& source instanceof window.Event;
if(!sourceIsEvt
&& source.hasOwnProperty && source.hasOwnProperty('toString')) {
destination.toString = source.toString;
}
}
return destination;
};
/**
* Function: removeItem
* Remove an object from an array. Iterates through the array
* to find the item, then removes it.
*
* Parameters:
* array - {Array}
* item - {Object}
*
* Return
* {Array} A reference to the array
*/
OpenLayers.Util.removeItem = function(array, item) {
for(var i = array.length - 1; i >= 0; i--) {
if(array[i] == item) {
array.splice(i,1);
//break;more than once??
}
}
return array;
};
/**
* Function: clearArray
* *Deprecated*. This function will disappear in 3.0.
* Please use "array.length = 0" instead.
*
* Parameters:
* array - {Array}
*/
OpenLayers.Util.clearArray = function(array) {
OpenLayers.Console.warn(
OpenLayers.i18n(
"methodDeprecated", {'newMethod': 'array = []'}
)
);
array.length = 0;
};
/**
* Function: indexOf
* Seems to exist already in FF, but not in MOZ.
*
* Parameters:
* array - {Array}
* obj - {Object}
*
* Returns:
* {Integer} The index at, which the first object was found in the array.
* If not found, returns -1.
*/
OpenLayers.Util.indexOf = function(array, obj) {
// use the build-in function if available.
if (typeof array.indexOf == "function") {
return array.indexOf(obj);
} else {
for (var i = 0, len = array.length; i < len; i++) {
if (array[i] == obj) {
return i;
}
}
return -1;
}
};
/**
* Function: modifyDOMElement
*
* Modifies many properties of a DOM element all at once. Passing in
* null to an individual parameter will avoid setting the attribute.
*
* Parameters:
* id - {String} The element id attribute to set.
* px - {<OpenLayers.Pixel>} The left and top style position.
* sz - {<OpenLayers.Size>} The width and height style attributes.
* position - {String} The position attribute. eg: absolute,
* relative, etc.
* border - {String} The style.border attribute. eg:
* solid black 2px
* overflow - {String} The style.overview attribute.
* opacity - {Float} Fractional value (0.0 - 1.0)
*/
OpenLayers.Util.modifyDOMElement = function(element, id, px, sz, position,
border, overflow, opacity) {
if (id) {
element.id = id;
}
if (px) {
element.style.left = px.x + "px";
element.style.top = px.y + "px";
}
if (sz) {
element.style.width = sz.w + "px";
element.style.height = sz.h + "px";
}
if (position) {
element.style.position = position;
}
if (border) {
element.style.border = border;
}
if (overflow) {
element.style.overflow = overflow;
}
if (parseFloat(opacity) >= 0.0 && parseFloat(opacity) < 1.0) {
element.style.filter = 'alpha(opacity=' + (opacity * 100) + ')';
element.style.opacity = opacity;
} else if (parseFloat(opacity) == 1.0) {
element.style.filter = '';
element.style.opacity = '';
}
};
/**
* Function: createDiv
* Creates a new div and optionally set some standard attributes.
* Null may be passed to each parameter if you do not wish to
* set a particular attribute.
* Note - zIndex is NOT set on the resulting div.
*
* Parameters:
* id - {String} An identifier for this element. If no id is
* passed an identifier will be created
* automatically.
* px - {<OpenLayers.Pixel>} The element left and top position.
* sz - {<OpenLayers.Size>} The element width and height.
* imgURL - {String} A url pointing to an image to use as a
* background image.
* position - {String} The style.position value. eg: absolute,
* relative etc.
* border - {String} The the style.border value.
* eg: 2px solid black
* overflow - {String} The style.overflow value. Eg. hidden
* opacity - {Float} Fractional value (0.0 - 1.0)
*
* Returns:
* {DOMElement} A DOM Div created with the specified attributes.
*/
OpenLayers.Util.createDiv = function(id, px, sz, imgURL, position,
border, overflow, opacity) {
var dom = document.createElement('div');
if (imgURL) {
dom.style.backgroundImage = 'url(' + imgURL + ')';
}
//set generic properties
if (!id) {
id = OpenLayers.Util.createUniqueID("OpenLayersDiv");
}
if (!position) {
position = "absolute";
}
OpenLayers.Util.modifyDOMElement(dom, id, px, sz, position,
border, overflow, opacity);
return dom;
};
/**
* Function: createImage
* Creates an img element with specific attribute values.
*
* Parameters:
* id - {String} The id field for the img. If none assigned one will be
* automatically generated.
* px - {<OpenLayers.Pixel>} The left and top positions.
* sz - {<OpenLayers.Size>} The style.width and style.height values.
* imgURL - {String} The url to use as the image source.
* position - {String} The style.position value.
* border - {String} The border to place around the image.
* opacity - {Float} Fractional value (0.0 - 1.0)
* delayDisplay - {Boolean} If true waits until the image has been
* loaded.
*
* Returns:
* {DOMElement} A DOM Image created with the specified attributes.
*/
OpenLayers.Util.createImage = function(id, px, sz, imgURL, position, border,
opacity, delayDisplay) {
var image = document.createElement("img");
//set generic properties
if (!id) {
id = OpenLayers.Util.createUniqueID("OpenLayersDiv");
}
if (!position) {
position = "relative";
}
OpenLayers.Util.modifyDOMElement(image, id, px, sz, position,
border, null, opacity);
if(delayDisplay) {
image.style.display = "none";
OpenLayers.Event.observe(image, "load",
OpenLayers.Function.bind(OpenLayers.Util.onImageLoad, image));
OpenLayers.Event.observe(image, "error",
OpenLayers.Function.bind(OpenLayers.Util.onImageLoadError, image));
}
//set special properties
image.style.alt = id;
image.galleryImg = "no";
if (imgURL) {
image.src = imgURL;
}
return image;
};
/**
* Function: setOpacity
* *Deprecated*. This function has been deprecated. Instead, please use
* <OpenLayers.Util.modifyDOMElement>
* or
* <OpenLayers.Util.modifyAlphaImageDiv>
*
* Set the opacity of a DOM Element
* Note that for this function to work in IE, elements must "have layout"
* according to:
* http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/haslayout.asp
*
* Parameters:
* element - {DOMElement} Set the opacity on this DOM element
* opacity - {Float} Opacity value (0.0 - 1.0)
*/
OpenLayers.Util.setOpacity = function(element, opacity) {
OpenLayers.Util.modifyDOMElement(element, null, null, null,
null, null, null, opacity);
};
/**
* Function: onImageLoad
* Bound to image load events. For all images created with <createImage> or
* <createAlphaImageDiv>, this function will be bound to the load event.
*/
OpenLayers.Util.onImageLoad = function() {
// The complex check here is to solve issues described in #480.
// Every time a map view changes, it increments the 'viewRequestID'
// property. As the requests for the images for the new map view are sent
// out, they are tagged with this unique viewRequestID.
//
// If an image has no viewRequestID property set, we display it regardless,
// but if it does have a viewRequestID property, we check that it matches
// the viewRequestID set on the map.
//
// If the viewRequestID on the map has changed, that means that the user
// has changed the map view since this specific request was sent out, and
// therefore this tile does not need to be displayed (so we do not execute
// this code that turns its display on).
//
if (!this.viewRequestID ||
(this.map && this.viewRequestID == this.map.viewRequestID)) {
this.style.display = "";
}
OpenLayers.Element.removeClass(this, "olImageLoadError");
};
/**
* Property: IMAGE_RELOAD_ATTEMPTS
* {Integer} How many times should we try to reload an image before giving up?
* Default is 0
*/
OpenLayers.IMAGE_RELOAD_ATTEMPTS = 0;
/**
* Function: onImageLoadError
*/
OpenLayers.Util.onImageLoadError = function() {
this._attempts = (this._attempts) ? (this._attempts + 1) : 1;
if (this._attempts <= OpenLayers.IMAGE_RELOAD_ATTEMPTS) {
var urls = this.urls;
if (urls && urls instanceof Array && urls.length > 1){
var src = this.src.toString();
var current_url, k;
for (k = 0; current_url = urls[k]; k++){
if(src.indexOf(current_url) != -1){
break;
}
}
var guess = Math.floor(urls.length * Math.random());
var new_url = urls[guess];
k = 0;
while(new_url == current_url && k++ < 4){
guess = Math.floor(urls.length * Math.random());
new_url = urls[guess];
}
this.src = src.replace(current_url, new_url);
} else {
this.src = this.src;
}
} else {
OpenLayers.Element.addClass(this, "olImageLoadError");
}
this.style.display = "";
};
/**
* Property: alphaHackNeeded
* {Boolean} true if the png alpha hack is necessary and possible, false otherwise.
*/
OpenLayers.Util.alphaHackNeeded = null;
/**
* Function: alphaHack
* Checks whether it's necessary (and possible) to use the png alpha
* hack which allows alpha transparency for png images under Internet
* Explorer.
*
* Returns:
* {Boolean} true if the png alpha hack is necessary and possible, false otherwise.
*/
OpenLayers.Util.alphaHack = function() {
if (OpenLayers.Util.alphaHackNeeded == null) {
var arVersion = navigator.appVersion.split("MSIE");
var version = parseFloat(arVersion[1]);
var filter = false;
// IEs4Lin dies when trying to access document.body.filters, because
// the property is there, but requires a DLL that can't be provided. This
// means that we need to wrap this in a try/catch so that this can
// continue.
try {
filter = !!(document.body.filters);
} catch (e) {}
OpenLayers.Util.alphaHackNeeded = (filter &&
(version >= 5.5) && (version < 7));
}
return OpenLayers.Util.alphaHackNeeded;
};
/**
* Function: modifyAlphaImageDiv
*
* div - {DOMElement} Div containing Alpha-adjusted Image
* id - {String}
* px - {<OpenLayers.Pixel>}
* sz - {<OpenLayers.Size>}
* imgURL - {String}
* position - {String}
* border - {String}
* sizing {String} 'crop', 'scale', or 'image'. Default is "scale"
* opacity - {Float} Fractional value (0.0 - 1.0)
*/
OpenLayers.Util.modifyAlphaImageDiv = function(div, id, px, sz, imgURL,
position, border, sizing,
opacity) {
OpenLayers.Util.modifyDOMElement(div, id, px, sz, position,
null, null, opacity);
var img = div.childNodes[0];
if (imgURL) {
img.src = imgURL;
}
OpenLayers.Util.modifyDOMElement(img, div.id + "_innerImage", null, sz,
"relative", border);
if (OpenLayers.Util.alphaHack()) {
if(div.style.display != "none") {
div.style.display = "inline-block";
}
if (sizing == null) {
sizing = "scale";
}
div.style.filter = "progid:DXImageTransform.Microsoft" +
".AlphaImageLoader(src='" + img.src + "', " +
"sizingMethod='" + sizing + "')";
if (parseFloat(div.style.opacity) >= 0.0 &&
parseFloat(div.style.opacity) < 1.0) {
div.style.filter += " alpha(opacity=" + div.style.opacity * 100 + ")";
}
img.style.filter = "alpha(opacity=0)";
}
};
/**
* Function: createAlphaImageDiv
*
* id - {String}
* px - {<OpenLayers.Pixel>}
* sz - {<OpenLayers.Size>}
* imgURL - {String}
* position - {String}
* border - {String}
* sizing - {String} 'crop', 'scale', or 'image'. Default is "scale"
* opacity - {Float} Fractional value (0.0 - 1.0)
* delayDisplay - {Boolean} If true waits until the image has been
* loaded.
*
* Returns:
* {DOMElement} A DOM Div created with a DOM Image inside it. If the hack is
* needed for transparency in IE, it is added.
*/
OpenLayers.Util.createAlphaImageDiv = function(id, px, sz, imgURL,
position, border, sizing,
opacity, delayDisplay) {
var div = OpenLayers.Util.createDiv();
var img = OpenLayers.Util.createImage(null, null, null, null, null, null,
null, false);
div.appendChild(img);
if (delayDisplay) {
img.style.display = "none";
OpenLayers.Event.observe(img, "load",
OpenLayers.Function.bind(OpenLayers.Util.onImageLoad, div));
OpenLayers.Event.observe(img, "error",
OpenLayers.Function.bind(OpenLayers.Util.onImageLoadError, div));
}
OpenLayers.Util.modifyAlphaImageDiv(div, id, px, sz, imgURL, position,
border, sizing, opacity);
return div;
};
/**
* Function: upperCaseObject
* Creates a new hashtable and copies over all the keys from the
* passed-in object, but storing them under an uppercased
* version of the key at which they were stored.
*
* Parameters:
* object - {Object}
*
* Returns:
* {Object} A new Object with all the same keys but uppercased
*/
OpenLayers.Util.upperCaseObject = function (object) {
var uObject = {};
for (var key in object) {
uObject[key.toUpperCase()] = object[key];
}
return uObject;
};
/**
* Function: applyDefaults
* Takes an object and copies any properties that don't exist from
* another properties, by analogy with OpenLayers.Util.extend() from
* Prototype.js.
*
* Parameters:
* to - {Object} The destination object.
* from - {Object} The source object. Any properties of this object that
* are undefined in the to object will be set on the to object.
*
* Returns:
* {Object} A reference to the to object. Note that the to argument is modified
* in place and returned by this function.
*/
OpenLayers.Util.applyDefaults = function (to, from) {
to = to || {};
/*
* FF/Windows < 2.0.0.13 reports "Illegal operation on WrappedNative
* prototype object" when calling hawOwnProperty if the source object is an
* instance of window.Event.
*/
var fromIsEvt = typeof window.Event == "function"
&& from instanceof window.Event;
for (var key in from) {
if (to[key] === undefined ||
(!fromIsEvt && from.hasOwnProperty
&& from.hasOwnProperty(key) && !to.hasOwnProperty(key))) {
to[key] = from[key];
}
}
/**
* IE doesn't include the toString property when iterating over an object's
* properties with the for(property in object) syntax. Explicitly check if
* the source has its own toString property.
*/
if(!fromIsEvt && from && from.hasOwnProperty
&& from.hasOwnProperty('toString') && !to.hasOwnProperty('toString')) {
to.toString = from.toString;
}
return to;
};
/**
* Function: getParameterString
*
* Parameters:
* params - {Object}
*
* Returns:
* {String} A concatenation of the properties of an object in
* http parameter notation.
* (ex. <i>"key1=value1&key2=value2&key3=value3"</i>)
* If a parameter is actually a list, that parameter will then
* be set to a comma-seperated list of values (foo,bar) instead
* of being URL escaped (foo%3Abar).
*/
OpenLayers.Util.getParameterString = function(params) {
var paramsArray = [];
for (var key in params) {
var value = params[key];
if ((value != null) && (typeof value != 'function')) {
var encodedValue;
if (typeof value == 'object' && value.constructor == Array) {
/* value is an array; encode items and separate with "," */
var encodedItemArray = [];
var item;
for (var itemIndex=0, len=value.length; itemIndex<len; itemIndex++) {
item = value[itemIndex];
encodedItemArray.push(encodeURIComponent(
(item === null || item === undefined) ? "" : item)
);
}
encodedValue = encodedItemArray.join(",");
}
else {
/* value is a string; simply encode */
encodedValue = encodeURIComponent(value);
}
paramsArray.push(encodeURIComponent(key) + "=" + encodedValue);
}
}
return paramsArray.join("&");
};
/**
* Function: urlAppend
* Appends a parameter string to a url. This function includes the logic for
* using the appropriate character (none, & or ?) to append to the url before
* appending the param string.
*
* Parameters:
* url - {String} The url to append to
* paramStr - {String} The param string to append
*
* Returns:
* {String} The new url
*/
OpenLayers.Util.urlAppend = function(url, paramStr) {
var newUrl = url;
if(paramStr) {
var parts = (url + " ").split(/[?&]/);
newUrl += (parts.pop() === " " ?
paramStr :
parts.length ? "&" + paramStr : "?" + paramStr);
}
return newUrl;
};
/**
* Property: ImgPath
* {String} Default is ''.
*/
OpenLayers.ImgPath = '';
/**
* Function: getImagesLocation
*
* Returns:
* {String} The fully formatted image location string
*/
OpenLayers.Util.getImagesLocation = function() {
return OpenLayers.ImgPath || (OpenLayers._getScriptLocation() + "img/");
};
/**
* Function: Try
* Execute functions until one of them doesn't throw an error.
* Capitalized because "try" is a reserved word in JavaScript.
* Taken directly from OpenLayers.Util.Try()
*
* Parameters:
* [*] - {Function} Any number of parameters may be passed to Try()
* It will attempt to execute each of them until one of them
* successfully executes.
* If none executes successfully, returns null.
*
* Returns:
* {*} The value returned by the first successfully executed function.
*/
OpenLayers.Util.Try = function() {
var returnValue = null;
for (var i=0, len=arguments.length; i<len; i++) {
var lambda = arguments[i];
try {
returnValue = lambda();
break;
} catch (e) {}
}
return returnValue;
};
/**
* Function: getNodes
*
* These could/should be made namespace aware?
*
* Parameters:
* p - {}
* tagName - {String}
*
* Returns:
* {Array}
*/
OpenLayers.Util.getNodes=function(p, tagName) {
var nodes = OpenLayers.Util.Try(
function () {
return OpenLayers.Util._getNodes(p.documentElement.childNodes,
tagName);
},
function () {
return OpenLayers.Util._getNodes(p.childNodes, tagName);
}
);
return nodes;
};
/**
* Function: _getNodes
*
* Parameters:
* nodes - {Array}
* tagName - {String}
*
* Returns:
* {Array}
*/
OpenLayers.Util._getNodes=function(nodes, tagName) {
var retArray = [];
for (var i=0, len=nodes.length; i<len; i++) {
if (nodes[i].nodeName==tagName) {
retArray.push(nodes[i]);
}
}
return retArray;
};
/**
* Function: getTagText
*
* Parameters:
* parent - {}
* item - {String}
* index - {Integer}
*
* Returns:
* {String}
*/
OpenLayers.Util.getTagText = function (parent, item, index) {
var result = OpenLayers.Util.getNodes(parent, item);
if (result && (result.length > 0))
{
if (!index) {
index=0;
}
if (result[index].childNodes.length > 1) {
return result.childNodes[1].nodeValue;
}
else if (result[index].childNodes.length == 1) {
return result[index].firstChild.nodeValue;
}
} else {
return "";
}
};
/**
* Function: getXmlNodeValue
*
* Parameters:
* node - {XMLNode}
*
* Returns:
* {String} The text value of the given node, without breaking in firefox or IE
*/
OpenLayers.Util.getXmlNodeValue = function(node) {
var val = null;
OpenLayers.Util.Try(
function() {
val = node.text;
if (!val) {
val = node.textContent;
}
if (!val) {
val = node.firstChild.nodeValue;
}
},
function() {
val = node.textContent;
});
return val;
};
/**
* Function: mouseLeft
*
* Parameters:
* evt - {Event}
* div - {HTMLDivElement}
*
* Returns:
* {Boolean}
*/
OpenLayers.Util.mouseLeft = function (evt, div) {
// start with the element to which the mouse has moved
var target = (evt.relatedTarget) ? evt.relatedTarget : evt.toElement;
// walk up the DOM tree.
while (target != div && target != null) {
target = target.parentNode;
}
// if the target we stop at isn't the div, then we've left the div.
return (target != div);
};
/**
* Property: precision
* {Number} The number of significant digits to retain to avoid
* floating point precision errors.
*
* We use 14 as a "safe" default because, although IEEE 754 double floats
* (standard on most modern operating systems) support up to about 16
* significant digits, 14 significant digits are sufficient to represent
* sub-millimeter accuracy in any coordinate system that anyone is likely to
* use with OpenLayers.
*
* If DEFAULT_PRECISION is set to 0, the original non-truncating behavior
* of OpenLayers <2.8 is preserved. Be aware that this will cause problems
* with certain projections, e.g. spherical Mercator.
*
*/
OpenLayers.Util.DEFAULT_PRECISION = 14;
/**
* Function: toFloat
* Convenience method to cast an object to a Number, rounded to the
* desired floating point precision.
*
* Parameters:
* number - {Number} The number to cast and round.
* precision - {Number} An integer suitable for use with
* Number.toPrecision(). Defaults to OpenLayers.Util.DEFAULT_PRECISION.
* If set to 0, no rounding is performed.
*
* Returns:
* {Number} The cast, rounded number.
*/
OpenLayers.Util.toFloat = function (number, precision) {
if (precision == null) {
precision = OpenLayers.Util.DEFAULT_PRECISION;
}
var number;
if (precision == 0) {
number = parseFloat(number);
} else {
number = parseFloat(parseFloat(number).toPrecision(precision));
}
return number;
};
/**
* Function: rad
*
* Parameters:
* x - {Float}
*
* Returns:
* {Float}
*/
OpenLayers.Util.rad = function(x) {return x*Math.PI/180;};
/**
* Function: deg
*
* Parameters:
* x - {Float}
*
* Returns:
* {Float}
*/
OpenLayers.Util.deg = function(x) {return x*180/Math.PI;};
/**
* Property: VincentyConstants
* {Object} Constants for Vincenty functions.
*/
OpenLayers.Util.VincentyConstants = {
a: 6378137,
b: 6356752.3142,
f: 1/298.257223563
};
/**
* APIFunction: distVincenty
* Given two objects representing points with geographic coordinates, this
* calculates the distance between those points on the surface of an
* ellipsoid.
*
* Parameters:
* p1 - {<OpenLayers.LonLat>} (or any object with both .lat, .lon properties)
* p2 - {<OpenLayers.LonLat>} (or any object with both .lat, .lon properties)
*
* Returns:
* {Float} The distance (in km) between the two input points as measured on an
* ellipsoid. Note that the input point objects must be in geographic
* coordinates (decimal degrees) and the return distance is in kilometers.
*/
OpenLayers.Util.distVincenty = function(p1, p2) {
var ct = OpenLayers.Util.VincentyConstants;
var a = ct.a, b = ct.b, f = ct.f;
var L = OpenLayers.Util.rad(p2.lon - p1.lon);
var U1 = Math.atan((1-f) * Math.tan(OpenLayers.Util.rad(p1.lat)));
var U2 = Math.atan((1-f) * Math.tan(OpenLayers.Util.rad(p2.lat)));
var sinU1 = Math.sin(U1), cosU1 = Math.cos(U1);
var sinU2 = Math.sin(U2), cosU2 = Math.cos(U2);
var lambda = L, lambdaP = 2*Math.PI;
var iterLimit = 20;
while (Math.abs(lambda-lambdaP) > 1e-12 && --iterLimit>0) {
var sinLambda = Math.sin(lambda), cosLambda = Math.cos(lambda);
var sinSigma = Math.sqrt((cosU2*sinLambda) * (cosU2*sinLambda) +
(cosU1*sinU2-sinU1*cosU2*cosLambda) * (cosU1*sinU2-sinU1*cosU2*cosLambda));
if (sinSigma==0) {
return 0; // co-incident points
}
var cosSigma = sinU1*sinU2 + cosU1*cosU2*cosLambda;
var sigma = Math.atan2(sinSigma, cosSigma);
var alpha = Math.asin(cosU1 * cosU2 * sinLambda / sinSigma);
var cosSqAlpha = Math.cos(alpha) * Math.cos(alpha);
var cos2SigmaM = cosSigma - 2*sinU1*sinU2/cosSqAlpha;
var C = f/16*cosSqAlpha*(4+f*(4-3*cosSqAlpha));
lambdaP = lambda;
lambda = L + (1-C) * f * Math.sin(alpha) *
(sigma + C*sinSigma*(cos2SigmaM+C*cosSigma*(-1+2*cos2SigmaM*cos2SigmaM)));
}
if (iterLimit==0) {
return NaN; // formula failed to converge
}
var uSq = cosSqAlpha * (a*a - b*b) / (b*b);
var A = 1 + uSq/16384*(4096+uSq*(-768+uSq*(320-175*uSq)));
var B = uSq/1024 * (256+uSq*(-128+uSq*(74-47*uSq)));
var deltaSigma = B*sinSigma*(cos2SigmaM+B/4*(cosSigma*(-1+2*cos2SigmaM*cos2SigmaM)-
B/6*cos2SigmaM*(-3+4*sinSigma*sinSigma)*(-3+4*cos2SigmaM*cos2SigmaM)));
var s = b*A*(sigma-deltaSigma);
var d = s.toFixed(3)/1000; // round to 1mm precision
return d;
};
/**
* APIFunction: destinationVincenty
* Calculate destination point given start point lat/long (numeric degrees),
* bearing (numeric degrees) & distance (in m).
* Adapted from Chris Veness work, see
* http://www.movable-type.co.uk/scripts/latlong-vincenty-direct.html
*
* Parameters:
* lonlat - {<OpenLayers.LonLat>} (or any object with both .lat, .lon
* properties) The start point.
* brng - {Float} The bearing (degrees).
* distance - {Float} The ground distance (meters).
*
* Returns:
* {<OpenLayers.LonLat>} The destination point.
*/
OpenLayers.Util.destinationVincenty = function(lonlat, brng, dist) {
var u = OpenLayers.Util;
var ct = u.VincentyConstants;
var a = ct.a, b = ct.b, f = ct.f;
var lon1 = lonlat.lon;
var lat1 = lonlat.lat;
var s = dist;
var alpha1 = u.rad(brng);
var sinAlpha1 = Math.sin(alpha1);
var cosAlpha1 = Math.cos(alpha1);
var tanU1 = (1-f) * Math.tan(u.rad(lat1));
var cosU1 = 1 / Math.sqrt((1 + tanU1*tanU1)), sinU1 = tanU1*cosU1;
var sigma1 = Math.atan2(tanU1, cosAlpha1);
var sinAlpha = cosU1 * sinAlpha1;
var cosSqAlpha = 1 - sinAlpha*sinAlpha;
var uSq = cosSqAlpha * (a*a - b*b) / (b*b);
var A = 1 + uSq/16384*(4096+uSq*(-768+uSq*(320-175*uSq)));
var B = uSq/1024 * (256+uSq*(-128+uSq*(74-47*uSq)));
var sigma = s / (b*A), sigmaP = 2*Math.PI;
while (Math.abs(sigma-sigmaP) > 1e-12) {
var cos2SigmaM = Math.cos(2*sigma1 + sigma);
var sinSigma = Math.sin(sigma);
var cosSigma = Math.cos(sigma);
var deltaSigma = B*sinSigma*(cos2SigmaM+B/4*(cosSigma*(-1+2*cos2SigmaM*cos2SigmaM)-
B/6*cos2SigmaM*(-3+4*sinSigma*sinSigma)*(-3+4*cos2SigmaM*cos2SigmaM)));
sigmaP = sigma;
sigma = s / (b*A) + deltaSigma;
}
var tmp = sinU1*sinSigma - cosU1*cosSigma*cosAlpha1;
var lat2 = Math.atan2(sinU1*cosSigma + cosU1*sinSigma*cosAlpha1,
(1-f)*Math.sqrt(sinAlpha*sinAlpha + tmp*tmp));
var lambda = Math.atan2(sinSigma*sinAlpha1, cosU1*cosSigma - sinU1*sinSigma*cosAlpha1);
var C = f/16*cosSqAlpha*(4+f*(4-3*cosSqAlpha));
var L = lambda - (1-C) * f * sinAlpha *
(sigma + C*sinSigma*(cos2SigmaM+C*cosSigma*(-1+2*cos2SigmaM*cos2SigmaM)));
var revAz = Math.atan2(sinAlpha, -tmp); // final bearing
return new OpenLayers.LonLat(lon1+u.deg(L), u.deg(lat2));
};
/**
* Function: getParameters
* Parse the parameters from a URL or from the current page itself into a
* JavaScript Object. Note that parameter values with commas are separated
* out into an Array.
*
* Parameters:
* url - {String} Optional url used to extract the query string.
* If null, query string is taken from page location.
*
* Returns:
* {Object} An object of key/value pairs from the query string.
*/
OpenLayers.Util.getParameters = function(url) {
// if no url specified, take it from the location bar
url = url || window.location.href;
//parse out parameters portion of url string
var paramsString = "";
if (OpenLayers.String.contains(url, '?')) {
var start = url.indexOf('?') + 1;
var end = OpenLayers.String.contains(url, "#") ?
url.indexOf('#') : url.length;
paramsString = url.substring(start, end);
}
var parameters = {};
var pairs = paramsString.split(/[&;]/);
for(var i=0, len=pairs.length; i<len; ++i) {
var keyValue = pairs[i].split('=');
if (keyValue[0]) {
var key = decodeURIComponent(keyValue[0]);
var value = keyValue[1] || ''; //empty string if no value
//decode individual values (being liberal by replacing "+" with " ")
value = decodeURIComponent(value.replace(/\+/g, " ")).split(",");
//if there's only one value, do not return as array
if (value.length == 1) {
value = value[0];
}
parameters[key] = value;
}
}
return parameters;
};
/**
* Function: getArgs
* *Deprecated*. Will be removed in 3.0. Please use instead
* <OpenLayers.Util.getParameters>
*
* Parameters:
* url - {String} Optional url used to extract the query string.
* If null, query string is taken from page location.
*
* Returns:
* {Object} An object of key/value pairs from the query string.
*/
OpenLayers.Util.getArgs = function(url) {
OpenLayers.Console.warn(
OpenLayers.i18n(
"methodDeprecated", {'newMethod': 'OpenLayers.Util.getParameters'}
)
);
return OpenLayers.Util.getParameters(url);
};
/**
* Property: lastSeqID
* {Integer} The ever-incrementing count variable.
* Used for generating unique ids.
*/
OpenLayers.Util.lastSeqID = 0;
/**
* Function: createUniqueID
* Create a unique identifier for this session. Each time this function
* is called, a counter is incremented. The return will be the optional
* prefix (defaults to "id_") appended with the counter value.
*
* Parameters:
* prefix {String} Optionsal string to prefix unique id. Default is "id_".
*
* Returns:
* {String} A unique id string, built on the passed in prefix.
*/
OpenLayers.Util.createUniqueID = function(prefix) {
if (prefix == null) {
prefix = "id_";
}
OpenLayers.Util.lastSeqID += 1;
return prefix + OpenLayers.Util.lastSeqID;
};
/**
* Constant: INCHES_PER_UNIT
* {Object} Constant inches per unit -- borrowed from MapServer mapscale.c
* derivation of nautical miles from http://en.wikipedia.org/wiki/Nautical_mile
* Includes the full set of units supported by CS-MAP (http://trac.osgeo.org/csmap/)
* and PROJ.4 (http://trac.osgeo.org/proj/)
* The hardcoded table is maintain in a CS-MAP source code module named CSdataU.c
* The hardcoded table of PROJ.4 units are in pj_units.c.
*/
OpenLayers.INCHES_PER_UNIT = {
'inches': 1.0,
'ft': 12.0,
'mi': 63360.0,
'm': 39.3701,
'km': 39370.1,
'dd': 4374754,
'yd': 36
};
OpenLayers.INCHES_PER_UNIT["in"]= OpenLayers.INCHES_PER_UNIT.inches;
OpenLayers.INCHES_PER_UNIT["degrees"] = OpenLayers.INCHES_PER_UNIT.dd;
OpenLayers.INCHES_PER_UNIT["nmi"] = 1852 * OpenLayers.INCHES_PER_UNIT.m;
// Units from CS-Map
OpenLayers.METERS_PER_INCH = 0.02540005080010160020;
OpenLayers.Util.extend(OpenLayers.INCHES_PER_UNIT, {
"Inch": OpenLayers.INCHES_PER_UNIT.inches,
"Meter": 1.0 / OpenLayers.METERS_PER_INCH, //EPSG:9001
"Foot": 0.30480060960121920243 / OpenLayers.METERS_PER_INCH, //EPSG:9003
"IFoot": 0.30480000000000000000 / OpenLayers.METERS_PER_INCH, //EPSG:9002
"ClarkeFoot": 0.3047972651151 / OpenLayers.METERS_PER_INCH, //EPSG:9005
"SearsFoot": 0.30479947153867624624 / OpenLayers.METERS_PER_INCH, //EPSG:9041
"GoldCoastFoot": 0.30479971018150881758 / OpenLayers.METERS_PER_INCH, //EPSG:9094
"IInch": 0.02540000000000000000 / OpenLayers.METERS_PER_INCH,
"MicroInch": 0.00002540000000000000 / OpenLayers.METERS_PER_INCH,
"Mil": 0.00000002540000000000 / OpenLayers.METERS_PER_INCH,
"Centimeter": 0.01000000000000000000 / OpenLayers.METERS_PER_INCH,
"Kilometer": 1000.00000000000000000000 / OpenLayers.METERS_PER_INCH, //EPSG:9036
"Yard": 0.91440182880365760731 / OpenLayers.METERS_PER_INCH,
"SearsYard": 0.914398414616029 / OpenLayers.METERS_PER_INCH, //EPSG:9040
"IndianYard": 0.91439853074444079983 / OpenLayers.METERS_PER_INCH, //EPSG:9084
"IndianYd37": 0.91439523 / OpenLayers.METERS_PER_INCH, //EPSG:9085
"IndianYd62": 0.9143988 / OpenLayers.METERS_PER_INCH, //EPSG:9086
"IndianYd75": 0.9143985 / OpenLayers.METERS_PER_INCH, //EPSG:9087
"IndianFoot": 0.30479951 / OpenLayers.METERS_PER_INCH, //EPSG:9080
"IndianFt37": 0.30479841 / OpenLayers.METERS_PER_INCH, //EPSG:9081
"IndianFt62": 0.3047996 / OpenLayers.METERS_PER_INCH, //EPSG:9082
"IndianFt75": 0.3047995 / OpenLayers.METERS_PER_INCH, //EPSG:9083
"Mile": 1609.34721869443738887477 / OpenLayers.METERS_PER_INCH,
"IYard": 0.91440000000000000000 / OpenLayers.METERS_PER_INCH, //EPSG:9096
"IMile": 1609.34400000000000000000 / OpenLayers.METERS_PER_INCH, //EPSG:9093
"NautM": 1852.00000000000000000000 / OpenLayers.METERS_PER_INCH, //EPSG:9030
"Lat-66": 110943.316488932731 / OpenLayers.METERS_PER_INCH,
"Lat-83": 110946.25736872234125 / OpenLayers.METERS_PER_INCH,
"Decimeter": 0.10000000000000000000 / OpenLayers.METERS_PER_INCH,
"Millimeter": 0.00100000000000000000 / OpenLayers.METERS_PER_INCH,
"Dekameter": 10.00000000000000000000 / OpenLayers.METERS_PER_INCH,
"Decameter": 10.00000000000000000000 / OpenLayers.METERS_PER_INCH,
"Hectometer": 100.00000000000000000000 / OpenLayers.METERS_PER_INCH,
"GermanMeter": 1.0000135965 / OpenLayers.METERS_PER_INCH, //EPSG:9031
"CaGrid": 0.999738 / OpenLayers.METERS_PER_INCH,
"ClarkeChain": 20.1166194976 / OpenLayers.METERS_PER_INCH, //EPSG:9038
"GunterChain": 20.11684023368047 / OpenLayers.METERS_PER_INCH, //EPSG:9033
"BenoitChain": 20.116782494375872 / OpenLayers.METERS_PER_INCH, //EPSG:9062
"SearsChain": 20.11676512155 / OpenLayers.METERS_PER_INCH, //EPSG:9042
"ClarkeLink": 0.201166194976 / OpenLayers.METERS_PER_INCH, //EPSG:9039
"GunterLink": 0.2011684023368047 / OpenLayers.METERS_PER_INCH, //EPSG:9034
"BenoitLink": 0.20116782494375872 / OpenLayers.METERS_PER_INCH, //EPSG:9063
"SearsLink": 0.2011676512155 / OpenLayers.METERS_PER_INCH, //EPSG:9043
"Rod": 5.02921005842012 / OpenLayers.METERS_PER_INCH,
"IntnlChain": 20.1168 / OpenLayers.METERS_PER_INCH, //EPSG:9097
"IntnlLink": 0.201168 / OpenLayers.METERS_PER_INCH, //EPSG:9098
"Perch": 5.02921005842012 / OpenLayers.METERS_PER_INCH,
"Pole": 5.02921005842012 / OpenLayers.METERS_PER_INCH,
"Furlong": 201.1684023368046 / OpenLayers.METERS_PER_INCH,
"Rood": 3.778266898 / OpenLayers.METERS_PER_INCH,
"CapeFoot": 0.3047972615 / OpenLayers.METERS_PER_INCH,
"Brealey": 375.00000000000000000000 / OpenLayers.METERS_PER_INCH,
"ModAmFt": 0.304812252984505969011938 / OpenLayers.METERS_PER_INCH,
"Fathom": 1.8288 / OpenLayers.METERS_PER_INCH,
"NautM-UK": 1853.184 / OpenLayers.METERS_PER_INCH,
"50kilometers": 50000.0 / OpenLayers.METERS_PER_INCH,
"150kilometers": 150000.0 / OpenLayers.METERS_PER_INCH
});
//unit abbreviations supported by PROJ.4
OpenLayers.Util.extend(OpenLayers.INCHES_PER_UNIT, {
"mm": OpenLayers.INCHES_PER_UNIT["Meter"] / 1000.0,
"cm": OpenLayers.INCHES_PER_UNIT["Meter"] / 100.0,
"dm": OpenLayers.INCHES_PER_UNIT["Meter"] * 100.0,
"km": OpenLayers.INCHES_PER_UNIT["Meter"] * 1000.0,
"kmi": OpenLayers.INCHES_PER_UNIT["nmi"], //International Nautical Mile
"fath": OpenLayers.INCHES_PER_UNIT["Fathom"], //International Fathom
"ch": OpenLayers.INCHES_PER_UNIT["IntnlChain"], //International Chain
"link": OpenLayers.INCHES_PER_UNIT["IntnlLink"], //International Link
"us-in": OpenLayers.INCHES_PER_UNIT["inches"], //U.S. Surveyor's Inch
"us-ft": OpenLayers.INCHES_PER_UNIT["Foot"], //U.S. Surveyor's Foot
"us-yd": OpenLayers.INCHES_PER_UNIT["Yard"], //U.S. Surveyor's Yard
"us-ch": OpenLayers.INCHES_PER_UNIT["GunterChain"], //U.S. Surveyor's Chain
"us-mi": OpenLayers.INCHES_PER_UNIT["Mile"], //U.S. Surveyor's Statute Mile
"ind-yd": OpenLayers.INCHES_PER_UNIT["IndianYd37"], //Indian Yard
"ind-ft": OpenLayers.INCHES_PER_UNIT["IndianFt37"], //Indian Foot
"ind-ch": 20.11669506 / OpenLayers.METERS_PER_INCH //Indian Chain
});
/**
* Constant: DOTS_PER_INCH
* {Integer} 72 (A sensible default)
*/
OpenLayers.DOTS_PER_INCH = 72;
/**
* Function: normalizeScale
*
* Parameters:
* scale - {float}
*
* Returns:
* {Float} A normalized scale value, in 1 / X format.
* This means that if a value less than one ( already 1/x) is passed
* in, it just returns scale directly. Otherwise, it returns
* 1 / scale
*/
OpenLayers.Util.normalizeScale = function (scale) {
var normScale = (scale > 1.0) ? (1.0 / scale)
: scale;
return normScale;
};
/**
* Function: getResolutionFromScale
*
* Parameters:
* scale - {Float}
* units - {String} Index into OpenLayers.INCHES_PER_UNIT hashtable.
* Default is degrees
*
* Returns:
* {Float} The corresponding resolution given passed-in scale and unit
* parameters. If the given scale is falsey, the returned resolution will
* be undefined.
*/
OpenLayers.Util.getResolutionFromScale = function (scale, units) {
var resolution;
if (scale) {
if (units == null) {
units = "degrees";
}
var normScale = OpenLayers.Util.normalizeScale(scale);
resolution = 1 / (normScale * OpenLayers.INCHES_PER_UNIT[units]
* OpenLayers.DOTS_PER_INCH);
}
return resolution;
};
/**
* Function: getScaleFromResolution
*
* Parameters:
* resolution - {Float}
* units - {String} Index into OpenLayers.INCHES_PER_UNIT hashtable.
* Default is degrees
*
* Returns:
* {Float} The corresponding scale given passed-in resolution and unit
* parameters.
*/
OpenLayers.Util.getScaleFromResolution = function (resolution, units) {
if (units == null) {
units = "degrees";
}
var scale = resolution * OpenLayers.INCHES_PER_UNIT[units] *
OpenLayers.DOTS_PER_INCH;
return scale;
};
/**
* Function: safeStopPropagation
* *Deprecated*. This function has been deprecated. Please use directly
* <OpenLayers.Event.stop> passing 'true' as the 2nd
* argument (preventDefault)
*
* Safely stop the propagation of an event *without* preventing
* the default browser action from occurring.
*
* Parameter:
* evt - {Event}
*/
OpenLayers.Util.safeStopPropagation = function(evt) {
OpenLayers.Event.stop(evt, true);
};
/**
* Function: pagePositon
* Calculates the position of an element on the page.
*
* Parameters:
* forElement - {DOMElement}
*
* Returns:
* {Array} two item array, L value then T value.
*/
OpenLayers.Util.pagePosition = function(forElement) {
var valueT = 0, valueL = 0;
var element = forElement;
var child = forElement;
while(element) {
if(element == document.body) {
if(OpenLayers.Element.getStyle(child, 'position') == 'absolute') {
break;
}
}
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
child = element;
try {
// wrapping this in a try/catch because IE chokes on the offsetParent
element = element.offsetParent;
} catch(e) {
OpenLayers.Console.error(OpenLayers.i18n(
"pagePositionFailed",{'elemId':element.id}));
break;
}
}
element = forElement;
while(element) {
valueT -= element.scrollTop || 0;
valueL -= element.scrollLeft || 0;
element = element.parentNode;
}
return [valueL, valueT];
};
/**
* Function: isEquivalentUrl
* Test two URLs for equivalence.
*
* Setting 'ignoreCase' allows for case-independent comparison.
*
* Comparison is based on:
* - Protocol
* - Host (evaluated without the port)
* - Port (set 'ignorePort80' to ignore "80" values)
* - Hash ( set 'ignoreHash' to disable)
* - Pathname (for relative <-> absolute comparison)
* - Arguments (so they can be out of order)
*
* Parameters:
* url1 - {String}
* url2 - {String}
* options - {Object} Allows for customization of comparison:
* 'ignoreCase' - Default is True
* 'ignorePort80' - Default is True
* 'ignoreHash' - Default is True
*
* Returns:
* {Boolean} Whether or not the two URLs are equivalent
*/
OpenLayers.Util.isEquivalentUrl = function(url1, url2, options) {
options = options || {};
OpenLayers.Util.applyDefaults(options, {
ignoreCase: true,
ignorePort80: true,
ignoreHash: true
});
var urlObj1 = OpenLayers.Util.createUrlObject(url1, options);
var urlObj2 = OpenLayers.Util.createUrlObject(url2, options);
//compare all keys except for "args" (treated below)
for(var key in urlObj1) {
if(key !== "args") {
if(urlObj1[key] != urlObj2[key]) {
return false;
}
}
}
// compare search args - irrespective of order
for(var key in urlObj1.args) {
if(urlObj1.args[key] != urlObj2.args[key]) {
return false;
}
delete urlObj2.args[key];
}
// urlObj2 shouldn't have any args left
for(var key in urlObj2.args) {
return false;
}
return true;
};
/**
* Function: createUrlObject
*
* Parameters:
* url - {String}
* options - {Object} A hash of options. Can be one of:
* ignoreCase: lowercase url,
* ignorePort80: don't include explicit port if port is 80,
* ignoreHash: Don't include part of url after the hash (#).
*
* Returns:
* {Object} An object with separate url, a, port, host, and args parsed out
* and ready for comparison
*/
OpenLayers.Util.createUrlObject = function(url, options) {
options = options || {};
// deal with relative urls first
if(!(/^\w+:\/\//).test(url)) {
var loc = window.location;
var port = loc.port ? ":" + loc.port : "";
var fullUrl = loc.protocol + "//" + loc.host.split(":").shift() + port;
if(url.indexOf("/") === 0) {
// full pathname
url = fullUrl + url;
} else {
// relative to current path
var parts = loc.pathname.split("/");
parts.pop();
url = fullUrl + parts.join("/") + "/" + url;
}
}
if (options.ignoreCase) {
url = url.toLowerCase();
}
var a = document.createElement('a');
a.href = url;
var urlObject = {};
//host (without port)
urlObject.host = a.host.split(":").shift();
//protocol
urlObject.protocol = a.protocol;
//port (get uniform browser behavior with port 80 here)
if(options.ignorePort80) {
urlObject.port = (a.port == "80" || a.port == "0") ? "" : a.port;
} else {
urlObject.port = (a.port == "" || a.port == "0") ? "80" : a.port;
}
//hash
urlObject.hash = (options.ignoreHash || a.hash === "#") ? "" : a.hash;
//args
var queryString = a.search;
if (!queryString) {
var qMark = url.indexOf("?");
queryString = (qMark != -1) ? url.substr(qMark) : "";
}
urlObject.args = OpenLayers.Util.getParameters(queryString);
//pathname (uniform browser behavior with leading "/")
urlObject.pathname = (a.pathname.charAt(0) == "/") ? a.pathname : "/" + a.pathname;
return urlObject;
};
/**
* Function: removeTail
* Takes a url and removes everything after the ? and #
*
* Parameters:
* url - {String} The url to process
*
* Returns:
* {String} The string with all queryString and Hash removed
*/
OpenLayers.Util.removeTail = function(url) {
var head = null;
var qMark = url.indexOf("?");
var hashMark = url.indexOf("#");
if (qMark == -1) {
head = (hashMark != -1) ? url.substr(0,hashMark) : url;
} else {
head = (hashMark != -1) ? url.substr(0,Math.min(qMark, hashMark))
: url.substr(0, qMark);
}
return head;
};
/**
* Function: getBrowserName
*
* Returns:
* {String} A string which specifies which is the current
* browser in which we are running.
*
* Currently-supported browser detection and codes:
* * 'opera' -- Opera
* * 'msie' -- Internet Explorer
* * 'safari' -- Safari
* * 'firefox' -- FireFox
* * 'mozilla' -- Mozilla
*
* If we are unable to property identify the browser, we
* return an empty string.
*/
OpenLayers.Util.getBrowserName = function() {
var browserName = "";
var ua = navigator.userAgent.toLowerCase();
if ( ua.indexOf( "opera" ) != -1 ) {
browserName = "opera";
} else if ( ua.indexOf( "msie" ) != -1 ) {
browserName = "msie";
} else if ( ua.indexOf( "safari" ) != -1 ) {
browserName = "safari";
} else if ( ua.indexOf( "mozilla" ) != -1 ) {
if ( ua.indexOf( "firefox" ) != -1 ) {
browserName = "firefox";
} else {
browserName = "mozilla";
}
}
return browserName;
};
/**
* Method: getRenderedDimensions
* Renders the contentHTML offscreen to determine actual dimensions for
* popup sizing. As we need layout to determine dimensions the content
* is rendered -9999px to the left and absolute to ensure the
* scrollbars do not flicker
*
* Parameters:
* contentHTML
* size - {<OpenLayers.Size>} If either the 'w' or 'h' properties is
* specified, we fix that dimension of the div to be measured. This is
* useful in the case where we have a limit in one dimension and must
* therefore meaure the flow in the other dimension.
* options - {Object}
* displayClass - {String} Optional parameter. A CSS class name(s) string
* to provide the CSS context of the rendered content.
* containerElement - {DOMElement} Optional parameter. Insert the HTML to
* this node instead of the body root when calculating dimensions.
*
* Returns:
* {OpenLayers.Size}
*/
OpenLayers.Util.getRenderedDimensions = function(contentHTML, size, options) {
var w, h;
// create temp container div with restricted size
var container = document.createElement("div");
container.style.visibility = "hidden";
var containerElement = (options && options.containerElement)
? options.containerElement : document.body;
//fix a dimension, if specified.
if (size) {
if (size.w) {
w = size.w;
container.style.width = w + "px";
} else if (size.h) {
h = size.h;
container.style.height = h + "px";
}
}
//add css classes, if specified
if (options && options.displayClass) {
container.className = options.displayClass;
}
// create temp content div and assign content
var content = document.createElement("div");
content.innerHTML = contentHTML;
// we need overflow visible when calculating the size
content.style.overflow = "visible";
if (content.childNodes) {
for (var i=0, l=content.childNodes.length; i<l; i++) {
if (!content.childNodes[i].style) continue;
content.childNodes[i].style.overflow = "visible";
}
}
// add content to restricted container
container.appendChild(content);
// append container to body for rendering
containerElement.appendChild(container);
// Opera and IE7 can't handle a node with position:aboslute if it inherits
// position:absolute from a parent.
var parentHasPositionAbsolute = false;
var parent = container.parentNode;
while (parent && parent.tagName.toLowerCase()!="body") {
var parentPosition = OpenLayers.Element.getStyle(parent, "position");
if(parentPosition == "absolute") {
parentHasPositionAbsolute = true;
break;
} else if (parentPosition && parentPosition != "static") {
break;
}
parent = parent.parentNode;
}
if(!parentHasPositionAbsolute) {
container.style.position = "absolute";
}
// calculate scroll width of content and add corners and shadow width
if (!w) {
w = parseInt(content.scrollWidth);
// update container width to allow height to adjust
container.style.width = w + "px";
}
// capture height and add shadow and corner image widths
if (!h) {
h = parseInt(content.scrollHeight);
}
// remove elements
container.removeChild(content);
containerElement.removeChild(container);
return new OpenLayers.Size(w, h);
};
/**
* APIFunction: getScrollbarWidth
* This function has been modified by the OpenLayers from the original version,
* written by Matthew Eernisse and released under the Apache 2
* license here:
*
* http://www.fleegix.org/articles/2006/05/30/getting-the-scrollbar-width-in-pixels
*
* It has been modified simply to cache its value, since it is physically
* impossible that this code could ever run in more than one browser at
* once.
*
* Returns:
* {Integer}
*/
OpenLayers.Util.getScrollbarWidth = function() {
var scrollbarWidth = OpenLayers.Util._scrollbarWidth;
if (scrollbarWidth == null) {
var scr = null;
var inn = null;
var wNoScroll = 0;
var wScroll = 0;
// Outer scrolling div
scr = document.createElement('div');
scr.style.position = 'absolute';
scr.style.top = '-1000px';
scr.style.left = '-1000px';
scr.style.width = '100px';
scr.style.height = '50px';
// Start with no scrollbar
scr.style.overflow = 'hidden';
// Inner content div
inn = document.createElement('div');
inn.style.width = '100%';
inn.style.height = '200px';
// Put the inner div in the scrolling div
scr.appendChild(inn);
// Append the scrolling div to the doc
document.body.appendChild(scr);
// Width of the inner div sans scrollbar
wNoScroll = inn.offsetWidth;
// Add the scrollbar
scr.style.overflow = 'scroll';
// Width of the inner div width scrollbar
wScroll = inn.offsetWidth;
// Remove the scrolling div from the doc
document.body.removeChild(document.body.lastChild);
// Pixel width of the scroller
OpenLayers.Util._scrollbarWidth = (wNoScroll - wScroll);
scrollbarWidth = OpenLayers.Util._scrollbarWidth;
}
return scrollbarWidth;
};
/**
* APIFunction: getFormattedLonLat
* This function will return latitude or longitude value formatted as
*
* Parameters:
* coordinate - {Float} the coordinate value to be formatted
* axis - {String} value of either 'lat' or 'lon' to indicate which axis is to
* to be formatted (default = lat)
* dmsOption - {String} specify the precision of the output can be one of:
* 'dms' show degrees minutes and seconds
* 'dm' show only degrees and minutes
* 'd' show only degrees
*
* Returns:
* {String} the coordinate value formatted as a string
*/
OpenLayers.Util.getFormattedLonLat = function(coordinate, axis, dmsOption) {
if (!dmsOption) {
dmsOption = 'dms'; //default to show degree, minutes, seconds
}
var abscoordinate = Math.abs(coordinate)
var coordinatedegrees = Math.floor(abscoordinate);
var coordinateminutes = (abscoordinate - coordinatedegrees)/(1/60);
var tempcoordinateminutes = coordinateminutes;
coordinateminutes = Math.floor(coordinateminutes);
var coordinateseconds = (tempcoordinateminutes - coordinateminutes)/(1/60);
coordinateseconds = Math.round(coordinateseconds*10);
coordinateseconds /= 10;
if( coordinatedegrees < 10 ) {
coordinatedegrees = "0" + coordinatedegrees;
}
var str = coordinatedegrees + "\u00B0";
if (dmsOption.indexOf('dm') >= 0) {
if( coordinateminutes < 10 ) {
coordinateminutes = "0" + coordinateminutes;
}
str += coordinateminutes + "'";
if (dmsOption.indexOf('dms') >= 0) {
if( coordinateseconds < 10 ) {
coordinateseconds = "0" + coordinateseconds;
}
str += coordinateseconds + '"';
}
}
if (axis == "lon") {
str += coordinate < 0 ? OpenLayers.i18n("W") : OpenLayers.i18n("E");
} else {
str += coordinate < 0 ? OpenLayers.i18n("S") : OpenLayers.i18n("N");
}
return str;
};
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