9190dd18d2
git-svn-id: http://svn.openlayers.org/trunk/openlayers@277 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
401 lines
11 KiB
JavaScript
401 lines
11 KiB
JavaScript
// @require OpenLayers/Util.js
|
|
/**
|
|
* @class
|
|
*
|
|
*
|
|
*/
|
|
|
|
OpenLayers.Map = Class.create();
|
|
OpenLayers.Map.prototype = {
|
|
// Hash: base z-indexes for different classes of thing
|
|
Z_INDEX_BASE: { Layer: 100, Popup: 200, Control: 250 },
|
|
|
|
// Array: supported application event types
|
|
EVENT_TYPES: [
|
|
"addlayer", "removelayer", "movestart", "move", "moveend",
|
|
"zoomend", "layerchanged", "popupopen", "popupclose",
|
|
"addmarker", "removemarker", "clearmarkers", "mouseover",
|
|
"mouseout", "mousemove", "dragstart", "drag", "dragend" ],
|
|
|
|
// int: zoom levels, used to draw zoom dragging control and limit zooming
|
|
maxZoomLevel: 16,
|
|
|
|
// OpenLayers.Bounds
|
|
maxExtent: new OpenLayers.Bounds(-180, -90, 180, 90),
|
|
|
|
/* maxScale was determined empirically by finding the resolution
|
|
of GMaps in degrees per pixel at zoom level 0. */
|
|
// float
|
|
maxResolution: .3515625, // degrees per pixel
|
|
|
|
/* projection */
|
|
projection: "EPSG:4326",
|
|
|
|
// DOMElement: the div that our map lives in
|
|
div: null,
|
|
|
|
// HTMLDivElement: the map's view port
|
|
viewPortDiv: null,
|
|
|
|
// HTMLDivElement: the map's layer container
|
|
layerContainerDiv: null,
|
|
|
|
// Array(OpenLayers.Layer): ordered list of layers in the map
|
|
layers: null,
|
|
|
|
// Array(OpenLayers.Control)
|
|
controls: null,
|
|
|
|
// Array(OpenLayers.Popup)
|
|
popups: null,
|
|
|
|
// OpenLayers.LonLat
|
|
center: null,
|
|
|
|
// int
|
|
zoom: null,
|
|
|
|
// OpenLayers.Events
|
|
events: null,
|
|
|
|
// OpenLayers.Pixel
|
|
mouseDragStart: null,
|
|
|
|
/**
|
|
* @param {DOMElement} div
|
|
*/
|
|
initialize: function (div, options) {
|
|
Object.extend(this, options);
|
|
|
|
this.div = div = $(div);
|
|
|
|
// the viewPortDiv is the outermost div we modify
|
|
this.viewPortDiv = OpenLayers.Util.createDiv(
|
|
div.id + "_OpenLayers_ViewPort" );
|
|
this.viewPortDiv.style.width = "100%";
|
|
this.viewPortDiv.style.height = "100%";
|
|
this.viewPortDiv.style.overflow = "hidden";
|
|
this.viewPortDiv.style.position = "relative";
|
|
this.div.appendChild(this.viewPortDiv);
|
|
|
|
|
|
// the layerContainerDiv is the one that holds all the layers
|
|
this.layerContainerDiv = OpenLayers.Util.createDiv(
|
|
div.id + "_OpenLayers_Container" );
|
|
this.viewPortDiv.appendChild(this.layerContainerDiv);
|
|
|
|
this.events = new OpenLayers.Events(this, div, this.EVENT_TYPES);
|
|
|
|
this.updateSize();
|
|
// update the internal size register whenever the div is resized
|
|
this.events.register("resize", this, this.updateSize);
|
|
|
|
this.layers = [];
|
|
|
|
if (!this.controls) {
|
|
this.controls = [];
|
|
this.addControl(new OpenLayers.Control.MouseDefaults());
|
|
this.addControl(new OpenLayers.Control.PanZoom());
|
|
}
|
|
|
|
this.popups = new Array();
|
|
|
|
// always call map.destroy()
|
|
Event.observe(window, 'unload',
|
|
this.destroy.bindAsEventListener(this));
|
|
},
|
|
|
|
/**
|
|
*/
|
|
destroy:function() {
|
|
for(var i=0; i< this.layers.length; i++) {
|
|
this.layers[i].destroy();
|
|
}
|
|
this.layers = null;
|
|
for(var i=0; i< this.controls.length; i++) {
|
|
this.controls[i].destroy();
|
|
}
|
|
this.controls = null;
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.Layer} layer
|
|
*/
|
|
addLayer: function (layer, zIndex) {
|
|
layer.map = this;
|
|
layer.projection = this.projection;
|
|
layer.div.style.overflow = "";
|
|
if (zIndex) {
|
|
layer.div.style.zIndex = zIndex;
|
|
} else {
|
|
layer.div.style.zIndex = this.Z_INDEX_BASE['Layer'] + this.layers.length;
|
|
}
|
|
this.layerContainerDiv.appendChild(layer.div);
|
|
this.layers.push(layer);
|
|
this.events.triggerEvent("addlayer");
|
|
},
|
|
|
|
/**
|
|
* @param {Array(OpenLayers.Layer)} layers
|
|
*/
|
|
addLayers: function (layers) {
|
|
for (var i = 0; i < layers.length; i++) {
|
|
this.addLayer(layers[i]);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.Control} control
|
|
* @param {OpenLayers.Pixel} px
|
|
*/
|
|
addControl: function (control, px) {
|
|
control.map = this;
|
|
this.controls.push(control);
|
|
var div = control.draw(px);
|
|
if (div) {
|
|
div.style.zIndex = this.Z_INDEX_BASE['Control'] +
|
|
this.controls.length;
|
|
this.viewPortDiv.appendChild( div );
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.Popup} popup
|
|
* @param {OpenLayers.Pixel} px
|
|
*/
|
|
addPopup: function(popup, px) {
|
|
this.popups.push(popup);
|
|
var popupDiv = popup.draw(px);
|
|
if (popupDiv) {
|
|
popupDiv.style.zIndex = this.Z_INDEX_BASE['Popup'] +
|
|
this.popups.length;
|
|
this.viewPortDiv.appendChild(popupDiv);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.Popup} popup
|
|
*/
|
|
removePopup: function(popup) {
|
|
this.popups.remove(popup);
|
|
if (popup.div) {
|
|
this.viewPortDiv.removeChild(popup.div);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @return {float}
|
|
*/
|
|
getResolution: function () {
|
|
// return degrees per pixel
|
|
return this.maxResolution / Math.pow(2, this.zoom);
|
|
},
|
|
|
|
/**
|
|
* @return {int}
|
|
*/
|
|
getZoom: function () {
|
|
return this.zoom;
|
|
},
|
|
|
|
/**
|
|
* @returns {OpenLayers.Size}
|
|
*/
|
|
getSize: function () {
|
|
return this.size;
|
|
},
|
|
|
|
updateSize: function() {
|
|
this.size = new OpenLayers.Size(
|
|
this.div.clientWidth, this.div.clientHeight);
|
|
this.events.div.offsets = null;
|
|
// Workaround for the fact that hidden elements return 0 for size.
|
|
if (this.size.w == 0 && this.size.h == 0) {
|
|
this.size.w = parseInt(this.div.style.width);
|
|
this.size.h = parseInt(this.div.style.height);
|
|
}
|
|
},
|
|
/**
|
|
* @return {OpenLayers.LonLat}
|
|
*/
|
|
getCenter: function () {
|
|
return this.center;
|
|
},
|
|
|
|
/**
|
|
* @return {OpenLayers.Bounds}
|
|
*/
|
|
getExtent: function () {
|
|
if (this.center) {
|
|
var res = this.getResolution();
|
|
var size = this.getSize();
|
|
var w_deg = size.w * res;
|
|
var h_deg = size.h * res;
|
|
return new OpenLayers.Bounds(
|
|
this.center.lon - w_deg / 2,
|
|
this.center.lat - h_deg / 2,
|
|
this.center.lon + w_deg / 2,
|
|
this.center.lat + h_deg / 2);
|
|
} else {
|
|
return null;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @return {OpenLayers.Bounds}
|
|
*/
|
|
getFullExtent: function () {
|
|
return this.maxExtent;
|
|
},
|
|
|
|
getZoomLevels: function() {
|
|
return this.maxZoomLevel;
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.Bounds} bounds
|
|
*
|
|
* @return {int}
|
|
*/
|
|
getZoomForExtent: function (bounds) {
|
|
var size = this.getSize();
|
|
var width = bounds.getWidth();
|
|
var height = bounds.getHeight();
|
|
var deg_per_pixel = (width > height ? width / size.w : height / size.h);
|
|
var zoom = Math.log(this.maxResolution / deg_per_pixel) / Math.log(2);
|
|
return Math.floor(Math.max(zoom, 0));
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.Pixel} point
|
|
*
|
|
* @return {OpenLayers.LonLat}
|
|
*/
|
|
getLonLatFromPixel: function (point) {
|
|
var center = this.getCenter(); //map center lon/lat
|
|
var res = this.getResolution();
|
|
var size = this.getSize();
|
|
|
|
var delta_x = point.x - (size.w / 2);
|
|
var delta_y = point.y - (size.h / 2);
|
|
|
|
return new OpenLayers.LonLat(center.lon + delta_x * res ,
|
|
center.lat - delta_y * res);
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.LonLat} lonlat
|
|
*
|
|
* @returns An OpenLayers.Pixel which is the passed-in OpenLayers.LonLat,
|
|
* translated into screen pixels given the current extent
|
|
* and resolution
|
|
* @type OpenLayers.Pixel
|
|
*/
|
|
getPixelFromLonLat: function (lonlat) {
|
|
var resolution = this.getResolution();
|
|
var extent = this.getExtent();
|
|
return new OpenLayers.Pixel(
|
|
Math.round(1/resolution * (lonlat.lon - extent.left)),
|
|
Math.round(1/resolution * (extent.top - lonlat.lat))
|
|
);
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.LonLat} lonlat
|
|
* @param {int} zoom
|
|
*/
|
|
setCenter: function (lonlat, zoom) {
|
|
if (this.center) { // otherwise there's nothing to move yet
|
|
this.moveLayerContainer(lonlat);
|
|
}
|
|
this.center = lonlat.copyOf();
|
|
var zoomChanged = null;
|
|
if (zoom != null && zoom != this.zoom
|
|
&& zoom >= 0 && zoom <= this.getZoomLevels()) {
|
|
zoomChanged = (this.zoom == null ? 0 : this.zoom);
|
|
this.zoom = zoom;
|
|
}
|
|
|
|
this.events.triggerEvent("movestart");
|
|
this.moveToNewExtent(zoomChanged);
|
|
this.events.triggerEvent("moveend");
|
|
},
|
|
|
|
moveToNewExtent: function (zoomChanged) {
|
|
if (zoomChanged != null) { // reset the layerContainerDiv's location
|
|
this.layerContainerDiv.style.left = "0px";
|
|
this.layerContainerDiv.style.top = "0px";
|
|
}
|
|
var bounds = this.getExtent();
|
|
for (var i = 0; i < this.layers.length; i++) {
|
|
this.layers[i].moveTo(bounds, (zoomChanged != null));
|
|
}
|
|
this.events.triggerEvent("move");
|
|
if (zoomChanged != null)
|
|
this.events.triggerEvent("zoomend",
|
|
{oldZoom: zoomChanged, newZoom: this.zoom});
|
|
},
|
|
|
|
/**
|
|
* zoomIn
|
|
* Increase zoom level by one.
|
|
*/
|
|
zoomIn: function() {
|
|
if (this.zoom != null && this.zoom <= this.getZoomLevels()) {
|
|
this.zoomTo( this.zoom += 1 );
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* zoomTo
|
|
* Set Zoom To int
|
|
*/
|
|
zoomTo: function(zoom) {
|
|
if (zoom >= 0 && zoom <= this.getZoomLevels()) {
|
|
var oldZoom = this.zoom;
|
|
this.zoom = zoom;
|
|
this.moveToNewExtent(oldZoom);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* zoomOut
|
|
* Decrease zoom level by one.
|
|
*/
|
|
zoomOut: function() {
|
|
if (this.zoom != null && this.zoom > 0) {
|
|
this.zoomTo( this.zoom - 1 );
|
|
}
|
|
},
|
|
|
|
zoomExtent: function() {
|
|
var fullExtent = this.getFullExtent();
|
|
var oldZoom = this.zoom;
|
|
this.zoom = this.getZoomForExtent( fullExtent );
|
|
this.setCenter(
|
|
new OpenLayers.LonLat((fullExtent.left+fullExtent.right)/2,
|
|
(fullExtent.bottom+fullExtent.top)/2)
|
|
);
|
|
},
|
|
|
|
/**
|
|
* @param {OpenLayers.LonLat} lonlat
|
|
*/
|
|
moveLayerContainer: function (lonlat) {
|
|
var container = this.layerContainerDiv;
|
|
var resolution = this.getResolution();
|
|
|
|
var deltaX = Math.round((this.center.lon - lonlat.lon) / resolution);
|
|
var deltaY = Math.round((this.center.lat - lonlat.lat) / resolution);
|
|
|
|
var offsetLeft = parseInt(container.style.left);
|
|
var offsetTop = parseInt(container.style.top);
|
|
|
|
container.style.left = (offsetLeft + deltaX) + "px";
|
|
container.style.top = (offsetTop - deltaY) + "px";
|
|
},
|
|
|
|
CLASS_NAME: "OpenLayers.Map"
|
|
};
|