cc1b0269c9
git-svn-id: http://svn.openlayers.org/trunk/openlayers@3767 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
688 lines
25 KiB
JavaScript
688 lines
25 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/repository-license.txt
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* for the full text of the license. */
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/**
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* @requires OpenLayers/Control.js
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* @requires OpenLayers/BaseTypes.js
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* @requires OpenLayers/Events.js
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*
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* Class: OpenLayers.Control.OverviewMap
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* Create an overview map to display the extent of your main map and provide
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* additional navigation control. Create a new overview map with the
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* <OpenLayers.Control.OverviewMap> constructor.
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*
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* Inerits from:
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* - <OpenLayers.Control>
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*/
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OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
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/**
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* Property: id
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* {String} For div.id
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*/
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id: "OverviewMap",
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/**
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* Property: element
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* {DOMElement} The DOM element that contains the overview map
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*/
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element: null,
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/**
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* APIProperty: ovmap
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* {<OpenLayers.Map>} A reference to the overvew map itself.
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*/
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ovmap: null,
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/**
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* APIProperty: size
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* {<OpenLayers.Size>} The overvew map size in pixels. Note that this is
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* the size of the map itself - the element that contains the map (default
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* class name olControlOverviewMapElement) may have padding or other style
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* attributes added via CSS.
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*/
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size: new OpenLayers.Size(180, 90),
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/**
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* APIProperty: layers
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* {Array(<OpenLayers.Layer>)} Ordered list of layers in the overview map.
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* If none are sent at construction, the base layer for the main map is used.
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*/
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layers: null,
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/**
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* APIProperty: minRatio
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* {Numver} The ratio of the overview map resolution to the main map
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* resolution at which to zoom farther out on the overview map.
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*/
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minRatio: 8,
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/**
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* APIProperty: maxRatio
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* {Float} The ratio of the overview map resolution to the main map
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* resolution at which to zoom farther in on the overview map.
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*/
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maxRatio: 32,
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/**
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* APIProperty: mapOptions
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* {Object} An object containing any non-default properties to be sent to
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* the overview map's map constructor. These should include any non-default
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* options that the main map was constructed with.
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*/
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mapOptions: null,
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/**
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* Constructor: OpenLayers.Control.OverviewMap
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* Create a new overview map
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*
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* Parameters:
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* object - {Object} Properties of this object will be set on the overview
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* map object. Note, to set options on the map object contained in this
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* control, set <mapOptions> as one of the options properties.
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*/
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initialize: function(options) {
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this.layers = new Array();
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OpenLayers.Control.prototype.initialize.apply(this, [options]);
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},
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/**
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* APIMethod: destroy
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* Deconstruct the control
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*/
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destroy: function() {
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if (!this.mapDiv) { // we've already been destroyed
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return;
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}
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this.mapDiv.removeChild(this.extentRectangle);
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this.extentRectangle = null;
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this.rectEvents.destroy();
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this.rectEvents = null;
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this.ovmap.destroy();
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this.ovmap = null;
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this.element.removeChild(this.mapDiv);
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this.mapDiv = null;
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this.mapDivEvents.destroy();
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this.mapDivEvents = null;
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this.div.removeChild(this.element);
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this.element = null;
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this.elementEvents.destroy();
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this.elementEvents = null;
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if (this.maximizeDiv) {
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OpenLayers.Event.stopObservingElement(this.maximizeDiv);
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this.div.removeChild(this.maximizeDiv);
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this.maximizeDiv = null;
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}
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if (this.minimizeDiv) {
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OpenLayers.Event.stopObservingElement(this.minimizeDiv);
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this.div.removeChild(this.minimizeDiv);
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this.minimizeDiv = null;
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}
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this.map.events.unregister('moveend', this, this.update);
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this.map.events.unregister("changebaselayer", this,
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this.baseLayerDraw);
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OpenLayers.Control.prototype.destroy.apply(this, arguments);
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},
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/**
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* Method: draw
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* Render the control in the browser.
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*/
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draw: function() {
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OpenLayers.Control.prototype.draw.apply(this, arguments);
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if(!(this.layers.length > 0)) {
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if (this.map.baseLayer) {
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var layer = this.map.baseLayer.clone();
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this.layers = [layer];
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} else {
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this.map.events.register("changebaselayer", this, this.baseLayerDraw);
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return this.div;
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}
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}
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// create overview map DOM elements
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this.element = document.createElement('div');
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this.element.className = this.displayClass + 'Element';
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this.element.style.display = 'none';
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this.mapDiv = document.createElement('div');
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this.mapDiv.style.width = this.size.w + 'px';
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this.mapDiv.style.height = this.size.h + 'px';
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this.mapDiv.style.position = 'relative';
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this.mapDiv.style.overflow = 'hidden';
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this.mapDiv.id = OpenLayers.Util.createUniqueID('overviewMap');
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this.extentRectangle = document.createElement('div');
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this.extentRectangle.style.position = 'absolute';
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this.extentRectangle.style.zIndex = 1000; //HACK
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this.extentRectangle.style.overflow = 'hidden';
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this.extentRectangle.style.backgroundImage = 'url(' +
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OpenLayers.Util.getImagesLocation() +
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'blank.gif)';
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this.extentRectangle.className = this.displayClass+'ExtentRectangle';
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this.mapDiv.appendChild(this.extentRectangle);
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this.element.appendChild(this.mapDiv);
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this.div.appendChild(this.element);
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this.map.events.register('moveend', this, this.update);
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// Set up events. The image div recenters the map on click.
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// The extent rectangle can be dragged to recenter the map.
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// If the mousedown happened elsewhere, then mousemove and mouseup
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// should slip through.
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this.elementEvents = new OpenLayers.Events(this, this.element);
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this.elementEvents.register('mousedown', this, function(e) {
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OpenLayers.Event.stop(e);
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});
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this.elementEvents.register('click', this, function(e) {
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OpenLayers.Event.stop(e);
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});
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this.elementEvents.register('dblclick', this, function(e) {
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OpenLayers.Event.stop(e);
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});
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this.rectEvents = new OpenLayers.Events(this, this.extentRectangle,
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null, true);
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this.rectEvents.register('mouseout', this, this.rectMouseOut);
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this.rectEvents.register('mousedown', this, this.rectMouseDown);
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this.rectEvents.register('mousemove', this, this.rectMouseMove);
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this.rectEvents.register('mouseup', this, this.rectMouseUp);
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this.rectEvents.register('click', this, function(e) {
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OpenLayers.Event.stop(e);
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});
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this.rectEvents.register('dblclick', this, this.rectDblClick );
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this.mapDivEvents = new OpenLayers.Events(this, this.mapDiv);
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this.mapDivEvents.register('click', this, this.mapDivClick);
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// Optionally add min/max buttons if the control will go in the
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// map viewport.
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if(!this.outsideViewport) {
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this.div.className = this.displayClass + 'Container';
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var imgLocation = OpenLayers.Util.getImagesLocation();
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// maximize button div
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var img = imgLocation + 'layer-switcher-maximize.png';
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this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv(
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this.displayClass + 'MaximizeButton',
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null,
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new OpenLayers.Size(18,18),
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img,
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'absolute');
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this.maximizeDiv.style.display = 'none';
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this.maximizeDiv.className = this.displayClass + 'MaximizeButton';
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OpenLayers.Event.observe(this.maximizeDiv,
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'click',
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this.maximizeControl.bindAsEventListener(this));
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OpenLayers.Event.observe(this.maximizeDiv,
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'dblclick',
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function(e) {
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OpenLayers.Event.stop(e);
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});
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this.div.appendChild(this.maximizeDiv);
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// minimize button div
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var img = imgLocation + 'layer-switcher-minimize.png';
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this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv(
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'OpenLayers_Control_minimizeDiv',
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null,
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new OpenLayers.Size(18,18),
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img,
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'absolute');
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this.minimizeDiv.style.display = 'none';
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this.minimizeDiv.className = this.displayClass + 'MinimizeButton';
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OpenLayers.Event.observe(this.minimizeDiv,
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'click',
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this.minimizeControl.bindAsEventListener(this));
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OpenLayers.Event.observe(this.minimizeDiv,
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'dblclick',
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function(e) {
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OpenLayers.Event.stop(e);
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});
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this.div.appendChild(this.minimizeDiv);
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this.minimizeControl();
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} else {
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// show the overview map
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this.element.style.display = '';
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}
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if(this.map.getExtent()) {
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this.update();
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}
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return this.div;
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},
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/**
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* Method: baseLayerDraw
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* Draw the base layer - called if unable to complete in the initial draw
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*/
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baseLayerDraw: function() {
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this.draw();
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this.map.events.unregister("changebaselayer", this, this.baseLayerDraw);
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},
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/**
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* Method: rectMouseOut
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* Handle browser events
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*
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* Parameters:
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* evt - {<OpenLayers.Event>} evt
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*/
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rectMouseOut: function (evt) {
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if(this.rectDragStart != null) {
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if(this.performedRectDrag) {
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this.rectMouseMove(evt);
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var rectPxBounds = this.getRectPxBounds();
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// if we're off of the overview map, update the main map
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// otherwise, keep moving the rect
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if((rectPxBounds.top <= 0) || (rectPxBounds.left <= 0) ||
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(rectPxBounds.bottom >= this.size.h - this.hComp) ||
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(rectPxBounds.right >= this.size.w - this.wComp)) {
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this.updateMapToRect();
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} else {
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return;
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}
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}
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document.onselectstart = null;
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this.rectDragStart = null;
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}
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},
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/**
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* Method: rectMouseDown
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* Handle browser events
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*
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* Parameters:
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* evt - {<OpenLayers.Event>} evt
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*/
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rectMouseDown: function (evt) {
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if(!OpenLayers.Event.isLeftClick(evt)) return;
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this.rectDragStart = evt.xy.clone();
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this.performedRectDrag = false;
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OpenLayers.Event.stop(evt);
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},
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/**
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* Method: rectMouseMove
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* Handle browser events
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*
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* Parameters:
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* evt - {<OpenLayers.Event>} evt
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*/
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rectMouseMove: function(evt) {
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if(this.rectDragStart != null) {
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var deltaX = this.rectDragStart.x - evt.xy.x;
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var deltaY = this.rectDragStart.y - evt.xy.y;
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var rectPxBounds = this.getRectPxBounds();
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var rectTop = rectPxBounds.top;
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var rectLeft = rectPxBounds.left;
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var rectHeight = Math.abs(rectPxBounds.getHeight());
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var rectWidth = rectPxBounds.getWidth();
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// don't allow dragging off of parent element
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var newTop = Math.max(0, (rectTop - deltaY));
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newTop = Math.min(newTop,
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this.ovmap.size.h - this.hComp - rectHeight);
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var newLeft = Math.max(0, (rectLeft - deltaX));
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newLeft = Math.min(newLeft,
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this.ovmap.size.w - this.wComp - rectWidth);
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this.setRectPxBounds(new OpenLayers.Bounds(newLeft,
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newTop + rectHeight,
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newLeft + rectWidth,
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newTop));
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this.rectDragStart = evt.xy.clone();
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this.performedRectDrag = true;
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OpenLayers.Event.stop(evt);
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}
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},
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/**
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* Method: rectMouseUp
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* Handle browser events
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*
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* Parameters:
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* evt - {<OpenLayers.Event>} evt
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*/
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rectMouseUp: function(evt) {
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if(!OpenLayers.Event.isLeftClick(evt)) return;
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if(this.performedRectDrag) {
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this.updateMapToRect();
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OpenLayers.Event.stop(evt);
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}
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document.onselectstart = null;
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this.rectDragStart = null;
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},
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/**
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* Method: rectDblClick
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* Handle browser events
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*
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* Parameters:
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* evt - {<OpenLayers.Event>} evt
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*/
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rectDblClick: function(evt) {
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this.performedRectDrag = false;
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OpenLayers.Event.stop(evt);
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this.updateOverview();
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},
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/**
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* Method: mapDivClick
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* Handle browser events
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*
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* Parameters:
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* evt - {<OpenLayers.Event>} evt
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*/
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mapDivClick: function(evt) {
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var pxBounds = this.getRectPxBounds();
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var pxCenter = pxBounds.getCenterPixel();
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var deltaX = evt.xy.x - pxCenter.x;
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var deltaY = evt.xy.y - pxCenter.y;
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var top = pxBounds.top;
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var left = pxBounds.left;
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var height = Math.abs(pxBounds.getHeight());
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var width = pxBounds.getWidth();
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var newTop = Math.max(0, (top + deltaY));
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newTop = Math.min(newTop, this.ovmap.size.h - height);
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var newLeft = Math.max(0, (left + deltaX));
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newLeft = Math.min(newLeft, this.ovmap.size.w - width);
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this.setRectPxBounds(new OpenLayers.Bounds(newLeft,
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newTop + height,
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newLeft + width,
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newTop));
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this.updateMapToRect();
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OpenLayers.Event.stop(evt);
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},
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/**
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* Method: maximizeControl
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* Unhide the control. Called when the control is in the map viewport.
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*
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* Parameters:
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* e - {<OpenLayers.Event>}
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*/
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maximizeControl: function(e) {
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this.element.style.display = '';
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this.showToggle(false);
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if (e != null) {
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OpenLayers.Event.stop(e);
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}
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},
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/**
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* Method: minimizeControl
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* Hide all the contents of the control, shrink the size,
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* add the maximize icon
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*
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* Parameters:
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* e - {<OpenLayers.Event>}
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*/
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minimizeControl: function(e) {
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this.element.style.display = 'none';
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this.showToggle(true);
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if (e != null) {
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OpenLayers.Event.stop(e);
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}
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},
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/**
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* Method: showToggle
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* Hide/Show the toggle depending on whether the control is minimized
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*
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* Parameters:
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* minimize - {Boolean}
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*/
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showToggle: function(minimize) {
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this.maximizeDiv.style.display = minimize ? '' : 'none';
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this.minimizeDiv.style.display = minimize ? 'none' : '';
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},
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/**
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* Method: update
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* Update the overview map after layers move.
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*/
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update: function() {
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if(this.ovmap == null) {
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this.createMap();
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}
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if(!this.isSuitableOverview()) {
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this.updateOverview();
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}
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// update extent rectangle
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this.updateRectToMap();
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},
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/**
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* Method: isSuitableOverview
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* Determines if the overview map is suitable given the extent and
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* resolution of the main map.
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*/
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isSuitableOverview: function() {
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var mapExtent = this.map.getExtent();
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var maxExtent = this.map.maxExtent;
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var testExtent = new OpenLayers.Bounds(
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Math.max(mapExtent.left, maxExtent.left),
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Math.max(mapExtent.bottom, maxExtent.bottom),
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Math.min(mapExtent.right, maxExtent.right),
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Math.min(mapExtent.top, maxExtent.top));
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var resRatio = this.ovmap.getResolution() / this.map.getResolution();
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return ((resRatio > this.minRatio) &&
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(resRatio <= this.maxRatio) &&
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(this.ovmap.getExtent().containsBounds(testExtent)));
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},
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/**
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* Method updateOverview
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* Called by <update> if <isSuitableOverview> returns true
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*/
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updateOverview: function() {
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var mapRes = this.map.getResolution();
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var targetRes = this.ovmap.getResolution();
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var resRatio = targetRes / mapRes;
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if(resRatio > this.maxRatio) {
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// zoom in overview map
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targetRes = this.minRatio * mapRes;
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} else if(resRatio <= this.minRatio) {
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// zoom out overview map
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targetRes = this.maxRatio * mapRes;
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}
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this.ovmap.setCenter(this.map.center,
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this.ovmap.getZoomForResolution(targetRes));
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this.updateRectToMap();
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},
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/**
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* Method: createMap
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* Construct the map that this control contains
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*/
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createMap: function() {
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// create the overview map
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var options = OpenLayers.Util.extend(
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{controls: [], maxResolution: 'auto'}, this.mapOptions);
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this.ovmap = new OpenLayers.Map(this.mapDiv.id, options);
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this.ovmap.addLayers(this.layers);
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this.ovmap.zoomToMaxExtent();
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// check extent rectangle border width
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this.wComp = parseInt(OpenLayers.Element.getStyle(this.extentRectangle,
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'border-left-width')) +
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parseInt(OpenLayers.Element.getStyle(this.extentRectangle,
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'border-right-width'));
|
|
this.wComp = (this.wComp) ? this.wComp : 2;
|
|
this.hComp = parseInt(OpenLayers.Element.getStyle(this.extentRectangle,
|
|
'border-top-width')) +
|
|
parseInt(OpenLayers.Element.getStyle(this.extentRectangle,
|
|
'border-bottom-width'));
|
|
this.hComp = (this.hComp) ? this.hComp : 2;
|
|
},
|
|
|
|
/**
|
|
* Method: updateRectToMap
|
|
* Updates the extent rectangle position and size to match the map extent
|
|
*/
|
|
updateRectToMap: function() {
|
|
// The base layer for overview map needs to be in the same projection
|
|
// as the base layer for the main map. This should be made more robust.
|
|
if(this.map.units != 'degrees') {
|
|
if(this.ovmap.getProjection() && (this.map.getProjection() != this.ovmap.getProjection())) {
|
|
alert('The overview map only works when it is in the same projection as the main map');
|
|
}
|
|
}
|
|
var pxBounds = this.getRectBoundsFromMapBounds(this.map.getExtent());
|
|
if (pxBounds) {
|
|
this.setRectPxBounds(pxBounds);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Method: updateMapToRect
|
|
* Updates the map extent to match the extent rectangle position and size
|
|
*/
|
|
updateMapToRect: function() {
|
|
var pxBounds = this.getRectPxBounds();
|
|
var lonLatBounds = this.getMapBoundsFromRectBounds(pxBounds);
|
|
this.map.setCenter(lonLatBounds.getCenterLonLat(), this.map.zoom);
|
|
},
|
|
|
|
/**
|
|
* Method: getRectPxBounds
|
|
* Get extent rectangle pixel bounds
|
|
*
|
|
* Return:
|
|
* {<OpenLayers.Bounds>} A bounds which is the extent rectangle's pixel
|
|
* bounds (relative to the parent element)
|
|
*/
|
|
getRectPxBounds: function() {
|
|
var top = parseInt(this.extentRectangle.style.top);
|
|
var left = parseInt(this.extentRectangle.style.left);
|
|
var height = parseInt(this.extentRectangle.style.height);
|
|
var width = parseInt(this.extentRectangle.style.width);
|
|
return new OpenLayers.Bounds(left, top + height, left + width, top);
|
|
},
|
|
|
|
/**
|
|
* Method: setRectPxBounds
|
|
* Set extent rectangle pixel bounds.
|
|
*
|
|
* Parameters:
|
|
* pxBounds - {<OpenLayers.Bounds>}
|
|
*/
|
|
setRectPxBounds: function(pxBounds) {
|
|
var top = Math.max(pxBounds.top, 0);
|
|
var left = Math.max(pxBounds.left, 0);
|
|
var bottom = Math.min(pxBounds.top + Math.abs(pxBounds.getHeight()),
|
|
this.ovmap.size.h - this.hComp);
|
|
var right = Math.min(pxBounds.left + pxBounds.getWidth(),
|
|
this.ovmap.size.w - this.wComp);
|
|
this.extentRectangle.style.top = parseInt(top) + 'px';
|
|
this.extentRectangle.style.left = parseInt(left) + 'px';
|
|
this.extentRectangle.style.height = parseInt(Math.max(bottom - top, 0))+ 'px';
|
|
this.extentRectangle.style.width = parseInt(Math.max(right - left, 0)) + 'px';
|
|
},
|
|
|
|
/**
|
|
* Method: getRectBoundsFromMapBounds
|
|
* Get the rect bounds from the map bounds.
|
|
*
|
|
* Parameters:
|
|
* lonLatBounds - {<OpenLayers.Bounds>}
|
|
*
|
|
* Return:
|
|
* {<OpenLayers.Bounds>}A bounds which is the passed-in map lon/lat extent
|
|
* translated into pixel bounds for the overview map
|
|
*/
|
|
getRectBoundsFromMapBounds: function(lonLatBounds) {
|
|
var leftBottomLonLat = new OpenLayers.LonLat(lonLatBounds.left,
|
|
lonLatBounds.bottom);
|
|
var rightTopLonLat = new OpenLayers.LonLat(lonLatBounds.right,
|
|
lonLatBounds.top);
|
|
var leftBottomPx = this.getOverviewPxFromLonLat(leftBottomLonLat);
|
|
var rightTopPx = this.getOverviewPxFromLonLat(rightTopLonLat);
|
|
var bounds = null;
|
|
if (leftBottomPx && rightTopPx) {
|
|
bounds = new OpenLayers.Bounds(leftBottomPx.x, leftBottomPx.y,
|
|
rightTopPx.x, rightTopPx.y);
|
|
}
|
|
return bounds;
|
|
},
|
|
|
|
/**
|
|
* Method: getMapBoundsFromRectBounds
|
|
* Get the map bounds from the rect bounds.
|
|
*
|
|
* Parameters:
|
|
* pxBounds - {<OpenLayers.Bounds>}
|
|
*
|
|
* Return:
|
|
* {<OpenLayers.Bounds>} Bounds which is the passed-in overview rect bounds
|
|
* translated into lon/lat bounds for the overview map
|
|
*/
|
|
getMapBoundsFromRectBounds: function(pxBounds) {
|
|
var leftBottomPx = new OpenLayers.Pixel(pxBounds.left,
|
|
pxBounds.bottom);
|
|
var rightTopPx = new OpenLayers.Pixel(pxBounds.right,
|
|
pxBounds.top);
|
|
var leftBottomLonLat = this.getLonLatFromOverviewPx(leftBottomPx);
|
|
var rightTopLonLat = this.getLonLatFromOverviewPx(rightTopPx);
|
|
return new OpenLayers.Bounds(leftBottomLonLat.lon, leftBottomLonLat.lat,
|
|
rightTopLonLat.lon, rightTopLonLat.lat);
|
|
},
|
|
|
|
/**
|
|
* Method: getLonLatFromOverviewPx
|
|
* Get a map location from a pixel location
|
|
*
|
|
* Parameters:
|
|
* overviewMapPx - {<OpenLayers.Pixel>}
|
|
*
|
|
* Return:
|
|
* {<OpenLayers.LonLat>} Location which is the passed-in overview map
|
|
* OpenLayers.Pixel, translated into lon/lat by the overview map
|
|
*/
|
|
getLonLatFromOverviewPx: function(overviewMapPx) {
|
|
var size = this.ovmap.size;
|
|
var res = this.ovmap.getResolution();
|
|
var center = this.ovmap.getExtent().getCenterLonLat();
|
|
|
|
var delta_x = overviewMapPx.x - (size.w / 2);
|
|
var delta_y = overviewMapPx.y - (size.h / 2);
|
|
|
|
return new OpenLayers.LonLat(center.lon + delta_x * res ,
|
|
center.lat - delta_y * res);
|
|
},
|
|
|
|
/**
|
|
* Method: getOverviewPxFromLonLat
|
|
* Get a pixel location from a map location
|
|
*
|
|
* Parameters:
|
|
* lonlat - {<OpenLayers.LonLat>}
|
|
*
|
|
* Return:
|
|
* {<OpenLayers.Pixel>} Location which is the passed-in OpenLayers.LonLat,
|
|
* translated into overview map pixels
|
|
*/
|
|
getOverviewPxFromLonLat: function(lonlat) {
|
|
var res = this.ovmap.getResolution();
|
|
var extent = this.ovmap.getExtent();
|
|
var px = null;
|
|
if (extent) {
|
|
px = new OpenLayers.Pixel(
|
|
Math.round(1/res * (lonlat.lon - extent.left)),
|
|
Math.round(1/res * (extent.top - lonlat.lat)));
|
|
}
|
|
return px;
|
|
},
|
|
|
|
/** @final @type String */
|
|
CLASS_NAME: 'OpenLayers.Control.OverviewMap'
|
|
|
|
});
|