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path: root/misc/openlayers/lib/OpenLayers/Control/OverviewMap.js
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+/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
+ * full list of contributors). Published under the 2-clause BSD license.
+ * See license.txt in the OpenLayers distribution or repository for the
+ * full text of the license. */
+
+/**
+ * @requires OpenLayers/Control.js
+ * @requires OpenLayers/BaseTypes.js
+ * @requires OpenLayers/Events/buttonclick.js
+ * @requires OpenLayers/Map.js
+ * @requires OpenLayers/Handler/Click.js
+ * @requires OpenLayers/Handler/Drag.js
+ */
+
+/**
+ * Class: OpenLayers.Control.OverviewMap
+ * The OverMap control creates a small overview map, useful to display the
+ * extent of a zoomed map and your main map and provide additional
+ * navigation options to the User. By default the overview map is drawn in
+ * the lower right corner of the main map. Create a new overview map with the
+ * <OpenLayers.Control.OverviewMap> constructor.
+ *
+ * Inherits from:
+ * - <OpenLayers.Control>
+ */
+OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
+
+ /**
+ * Property: element
+ * {DOMElement} The DOM element that contains the overview map
+ */
+ element: null,
+
+ /**
+ * APIProperty: ovmap
+ * {<OpenLayers.Map>} A reference to the overview map itself.
+ */
+ ovmap: null,
+
+ /**
+ * APIProperty: size
+ * {<OpenLayers.Size>} The overvew map size in pixels. Note that this is
+ * the size of the map itself - the element that contains the map (default
+ * class name olControlOverviewMapElement) may have padding or other style
+ * attributes added via CSS.
+ */
+ size: {w: 180, h: 90},
+
+ /**
+ * APIProperty: layers
+ * {Array(<OpenLayers.Layer>)} Ordered list of layers in the overview map.
+ * If none are sent at construction, the base layer for the main map is used.
+ */
+ layers: null,
+
+ /**
+ * APIProperty: minRectSize
+ * {Integer} The minimum width or height (in pixels) of the extent
+ * rectangle on the overview map. When the extent rectangle reaches
+ * this size, it will be replaced depending on the value of the
+ * <minRectDisplayClass> property. Default is 15 pixels.
+ */
+ minRectSize: 15,
+
+ /**
+ * APIProperty: minRectDisplayClass
+ * {String} Replacement style class name for the extent rectangle when
+ * <minRectSize> is reached. This string will be suffixed on to the
+ * displayClass. Default is "RectReplacement".
+ *
+ * Example CSS declaration:
+ * (code)
+ * .olControlOverviewMapRectReplacement {
+ * overflow: hidden;
+ * cursor: move;
+ * background-image: url("img/overview_replacement.gif");
+ * background-repeat: no-repeat;
+ * background-position: center;
+ * }
+ * (end)
+ */
+ minRectDisplayClass: "RectReplacement",
+
+ /**
+ * APIProperty: minRatio
+ * {Float} The ratio of the overview map resolution to the main map
+ * resolution at which to zoom farther out on the overview map.
+ */
+ minRatio: 8,
+
+ /**
+ * APIProperty: maxRatio
+ * {Float} The ratio of the overview map resolution to the main map
+ * resolution at which to zoom farther in on the overview map.
+ */
+ maxRatio: 32,
+
+ /**
+ * APIProperty: mapOptions
+ * {Object} An object containing any non-default properties to be sent to
+ * the overview map's map constructor. These should include any
+ * non-default options that the main map was constructed with.
+ */
+ mapOptions: null,
+
+ /**
+ * APIProperty: autoPan
+ * {Boolean} Always pan the overview map, so the extent marker remains in
+ * the center. Default is false. If true, when you drag the extent
+ * marker, the overview map will update itself so the marker returns
+ * to the center.
+ */
+ autoPan: false,
+
+ /**
+ * Property: handlers
+ * {Object}
+ */
+ handlers: null,
+
+ /**
+ * Property: resolutionFactor
+ * {Object}
+ */
+ resolutionFactor: 1,
+
+ /**
+ * APIProperty: maximized
+ * {Boolean} Start as maximized (visible). Defaults to false.
+ */
+ maximized: false,
+
+ /**
+ * APIProperty: maximizeTitle
+ * {String} This property is used for showing a tooltip over the
+ * maximize div. Defaults to "" (no title).
+ */
+ maximizeTitle: "",
+
+ /**
+ * APIProperty: minimizeTitle
+ * {String} This property is used for showing a tooltip over the
+ * minimize div. Defaults to "" (no title).
+ */
+ minimizeTitle: "",
+
+ /**
+ * Constructor: OpenLayers.Control.OverviewMap
+ * Create a new overview map
+ *
+ * Parameters:
+ * options - {Object} Properties of this object will be set on the overview
+ * map object. Note, to set options on the map object contained in this
+ * control, set <mapOptions> as one of the options properties.
+ */
+ initialize: function(options) {
+ this.layers = [];
+ this.handlers = {};
+ OpenLayers.Control.prototype.initialize.apply(this, [options]);
+ },
+
+ /**
+ * APIMethod: destroy
+ * Deconstruct the control
+ */
+ destroy: function() {
+ if (!this.mapDiv) { // we've already been destroyed
+ return;
+ }
+ if (this.handlers.click) {
+ this.handlers.click.destroy();
+ }
+ if (this.handlers.drag) {
+ this.handlers.drag.destroy();
+ }
+
+ this.ovmap && this.ovmap.viewPortDiv.removeChild(this.extentRectangle);
+ this.extentRectangle = null;
+
+ if (this.rectEvents) {
+ this.rectEvents.destroy();
+ this.rectEvents = null;
+ }
+
+ if (this.ovmap) {
+ this.ovmap.destroy();
+ this.ovmap = null;
+ }
+
+ this.element.removeChild(this.mapDiv);
+ this.mapDiv = null;
+
+ this.div.removeChild(this.element);
+ this.element = null;
+
+ if (this.maximizeDiv) {
+ this.div.removeChild(this.maximizeDiv);
+ this.maximizeDiv = null;
+ }
+
+ if (this.minimizeDiv) {
+ this.div.removeChild(this.minimizeDiv);
+ this.minimizeDiv = null;
+ }
+
+ this.map.events.un({
+ buttonclick: this.onButtonClick,
+ moveend: this.update,
+ changebaselayer: this.baseLayerDraw,
+ scope: this
+ });
+
+ OpenLayers.Control.prototype.destroy.apply(this, arguments);
+ },
+
+ /**
+ * Method: draw
+ * Render the control in the browser.
+ */
+ draw: function() {
+ OpenLayers.Control.prototype.draw.apply(this, arguments);
+ if (this.layers.length === 0) {
+ if (this.map.baseLayer) {
+ var layer = this.map.baseLayer.clone();
+ this.layers = [layer];
+ } else {
+ this.map.events.register("changebaselayer", this, this.baseLayerDraw);
+ return this.div;
+ }
+ }
+
+ // create overview map DOM elements
+ this.element = document.createElement('div');
+ this.element.className = this.displayClass + 'Element';
+ this.element.style.display = 'none';
+
+ this.mapDiv = document.createElement('div');
+ this.mapDiv.style.width = this.size.w + 'px';
+ this.mapDiv.style.height = this.size.h + 'px';
+ this.mapDiv.style.position = 'relative';
+ this.mapDiv.style.overflow = 'hidden';
+ this.mapDiv.id = OpenLayers.Util.createUniqueID('overviewMap');
+
+ this.extentRectangle = document.createElement('div');
+ this.extentRectangle.style.position = 'absolute';
+ this.extentRectangle.style.zIndex = 1000; //HACK
+ this.extentRectangle.className = this.displayClass+'ExtentRectangle';
+
+ this.element.appendChild(this.mapDiv);
+
+ this.div.appendChild(this.element);
+
+ // Optionally add min/max buttons if the control will go in the
+ // map viewport.
+ if(!this.outsideViewport) {
+ this.div.className += " " + this.displayClass + 'Container';
+ // maximize button div
+ var img = OpenLayers.Util.getImageLocation('layer-switcher-maximize.png');
+ this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv(
+ this.displayClass + 'MaximizeButton',
+ null,
+ null,
+ img,
+ 'absolute');
+ this.maximizeDiv.style.display = 'none';
+ this.maximizeDiv.className = this.displayClass + 'MaximizeButton olButton';
+ if (this.maximizeTitle) {
+ this.maximizeDiv.title = this.maximizeTitle;
+ }
+ this.div.appendChild(this.maximizeDiv);
+
+ // minimize button div
+ var img = OpenLayers.Util.getImageLocation('layer-switcher-minimize.png');
+ this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv(
+ 'OpenLayers_Control_minimizeDiv',
+ null,
+ null,
+ img,
+ 'absolute');
+ this.minimizeDiv.style.display = 'none';
+ this.minimizeDiv.className = this.displayClass + 'MinimizeButton olButton';
+ if (this.minimizeTitle) {
+ this.minimizeDiv.title = this.minimizeTitle;
+ }
+ this.div.appendChild(this.minimizeDiv);
+ this.minimizeControl();
+ } else {
+ // show the overview map
+ this.element.style.display = '';
+ }
+ if(this.map.getExtent()) {
+ this.update();
+ }
+
+ this.map.events.on({
+ buttonclick: this.onButtonClick,
+ moveend: this.update,
+ scope: this
+ });
+
+ if (this.maximized) {
+ this.maximizeControl();
+ }
+ return this.div;
+ },
+
+ /**
+ * Method: baseLayerDraw
+ * Draw the base layer - called if unable to complete in the initial draw
+ */
+ baseLayerDraw: function() {
+ this.draw();
+ this.map.events.unregister("changebaselayer", this, this.baseLayerDraw);
+ },
+
+ /**
+ * Method: rectDrag
+ * Handle extent rectangle drag
+ *
+ * Parameters:
+ * px - {<OpenLayers.Pixel>} The pixel location of the drag.
+ */
+ rectDrag: function(px) {
+ var deltaX = this.handlers.drag.last.x - px.x;
+ var deltaY = this.handlers.drag.last.y - px.y;
+ if(deltaX != 0 || deltaY != 0) {
+ var rectTop = this.rectPxBounds.top;
+ var rectLeft = this.rectPxBounds.left;
+ var rectHeight = Math.abs(this.rectPxBounds.getHeight());
+ var rectWidth = this.rectPxBounds.getWidth();
+ // don't allow dragging off of parent element
+ var newTop = Math.max(0, (rectTop - deltaY));
+ newTop = Math.min(newTop,
+ this.ovmap.size.h - this.hComp - rectHeight);
+ var newLeft = Math.max(0, (rectLeft - deltaX));
+ newLeft = Math.min(newLeft,
+ this.ovmap.size.w - this.wComp - rectWidth);
+ this.setRectPxBounds(new OpenLayers.Bounds(newLeft,
+ newTop + rectHeight,
+ newLeft + rectWidth,
+ newTop));
+ }
+ },
+
+ /**
+ * Method: mapDivClick
+ * Handle browser events
+ *
+ * Parameters:
+ * evt - {<OpenLayers.Event>} evt
+ */
+ mapDivClick: function(evt) {
+ var pxCenter = this.rectPxBounds.getCenterPixel();
+ var deltaX = evt.xy.x - pxCenter.x;
+ var deltaY = evt.xy.y - pxCenter.y;
+ var top = this.rectPxBounds.top;
+ var left = this.rectPxBounds.left;
+ var height = Math.abs(this.rectPxBounds.getHeight());
+ var width = this.rectPxBounds.getWidth();
+ var newTop = Math.max(0, (top + deltaY));
+ newTop = Math.min(newTop, this.ovmap.size.h - height);
+ var newLeft = Math.max(0, (left + deltaX));
+ newLeft = Math.min(newLeft, this.ovmap.size.w - width);
+ this.setRectPxBounds(new OpenLayers.Bounds(newLeft,
+ newTop + height,
+ newLeft + width,
+ newTop));
+ this.updateMapToRect();
+ },
+
+ /**
+ * Method: onButtonClick
+ *
+ * Parameters:
+ * evt - {Event}
+ */
+ onButtonClick: function(evt) {
+ if (evt.buttonElement === this.minimizeDiv) {
+ this.minimizeControl();
+ } else if (evt.buttonElement === this.maximizeDiv) {
+ this.maximizeControl();
+ }
+ },
+
+ /**
+ * Method: maximizeControl
+ * Unhide the control. Called when the control is in the map viewport.
+ *
+ * Parameters:
+ * e - {<OpenLayers.Event>}
+ */
+ maximizeControl: function(e) {
+ this.element.style.display = '';
+ this.showToggle(false);
+ if (e != null) {
+ OpenLayers.Event.stop(e);
+ }
+ },
+
+ /**
+ * Method: minimizeControl
+ * Hide all the contents of the control, shrink the size,
+ * add the maximize icon
+ *
+ * Parameters:
+ * e - {<OpenLayers.Event>}
+ */
+ minimizeControl: function(e) {
+ this.element.style.display = 'none';
+ this.showToggle(true);
+ if (e != null) {
+ OpenLayers.Event.stop(e);
+ }
+ },
+
+ /**
+ * Method: showToggle
+ * Hide/Show the toggle depending on whether the control is minimized
+ *
+ * Parameters:
+ * minimize - {Boolean}
+ */
+ showToggle: function(minimize) {
+ if (this.maximizeDiv) {
+ this.maximizeDiv.style.display = minimize ? '' : 'none';
+ }
+ if (this.minimizeDiv) {
+ this.minimizeDiv.style.display = minimize ? 'none' : '';
+ }
+ },
+
+ /**
+ * Method: update
+ * Update the overview map after layers move.
+ */
+ update: function() {
+ if(this.ovmap == null) {
+ this.createMap();
+ }
+
+ if(this.autoPan || !this.isSuitableOverview()) {
+ this.updateOverview();
+ }
+
+ // update extent rectangle
+ this.updateRectToMap();
+ },
+
+ /**
+ * Method: isSuitableOverview
+ * Determines if the overview map is suitable given the extent and
+ * resolution of the main map.
+ */
+ isSuitableOverview: function() {
+ var mapExtent = this.map.getExtent();
+ var maxExtent = this.map.getMaxExtent();
+ var testExtent = new OpenLayers.Bounds(
+ Math.max(mapExtent.left, maxExtent.left),
+ Math.max(mapExtent.bottom, maxExtent.bottom),
+ Math.min(mapExtent.right, maxExtent.right),
+ Math.min(mapExtent.top, maxExtent.top));
+
+ if (this.ovmap.getProjection() != this.map.getProjection()) {
+ testExtent = testExtent.transform(
+ this.map.getProjectionObject(),
+ this.ovmap.getProjectionObject() );
+ }
+
+ var resRatio = this.ovmap.getResolution() / this.map.getResolution();
+ return ((resRatio > this.minRatio) &&
+ (resRatio <= this.maxRatio) &&
+ (this.ovmap.getExtent().containsBounds(testExtent)));
+ },
+
+ /**
+ * Method updateOverview
+ * Called by <update> if <isSuitableOverview> returns true
+ */
+ updateOverview: function() {
+ var mapRes = this.map.getResolution();
+ var targetRes = this.ovmap.getResolution();
+ var resRatio = targetRes / mapRes;
+ if(resRatio > this.maxRatio) {
+ // zoom in overview map
+ targetRes = this.minRatio * mapRes;
+ } else if(resRatio <= this.minRatio) {
+ // zoom out overview map
+ targetRes = this.maxRatio * mapRes;
+ }
+ var center;
+ if (this.ovmap.getProjection() != this.map.getProjection()) {
+ center = this.map.center.clone();
+ center.transform(this.map.getProjectionObject(),
+ this.ovmap.getProjectionObject() );
+ } else {
+ center = this.map.center;
+ }
+ this.ovmap.setCenter(center, this.ovmap.getZoomForResolution(
+ targetRes * this.resolutionFactor));
+ this.updateRectToMap();
+ },
+
+ /**
+ * Method: createMap
+ * Construct the map that this control contains
+ */
+ createMap: function() {
+ // create the overview map
+ var options = OpenLayers.Util.extend(
+ {controls: [], maxResolution: 'auto',
+ fallThrough: false}, this.mapOptions);
+ this.ovmap = new OpenLayers.Map(this.mapDiv, options);
+ this.ovmap.viewPortDiv.appendChild(this.extentRectangle);
+
+ // prevent ovmap from being destroyed when the page unloads, because
+ // the OverviewMap control has to do this (and does it).
+ OpenLayers.Event.stopObserving(window, 'unload', this.ovmap.unloadDestroy);
+
+ this.ovmap.addLayers(this.layers);
+ this.ovmap.zoomToMaxExtent();
+ // check extent rectangle border width
+ this.wComp = parseInt(OpenLayers.Element.getStyle(this.extentRectangle,
+ 'border-left-width')) +
+ parseInt(OpenLayers.Element.getStyle(this.extentRectangle,
+ '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;
+
+ this.handlers.drag = new OpenLayers.Handler.Drag(
+ this, {move: this.rectDrag, done: this.updateMapToRect},
+ {map: this.ovmap}
+ );
+ this.handlers.click = new OpenLayers.Handler.Click(
+ this, {
+ "click": this.mapDivClick
+ },{
+ "single": true, "double": false,
+ "stopSingle": true, "stopDouble": true,
+ "pixelTolerance": 1,
+ map: this.ovmap
+ }
+ );
+ this.handlers.click.activate();
+
+ this.rectEvents = new OpenLayers.Events(this, this.extentRectangle,
+ null, true);
+ this.rectEvents.register("mouseover", this, function(e) {
+ if(!this.handlers.drag.active && !this.map.dragging) {
+ this.handlers.drag.activate();
+ }
+ });
+ this.rectEvents.register("mouseout", this, function(e) {
+ if(!this.handlers.drag.dragging) {
+ this.handlers.drag.deactivate();
+ }
+ });
+
+ if (this.ovmap.getProjection() != this.map.getProjection()) {
+ var sourceUnits = this.map.getProjectionObject().getUnits() ||
+ this.map.units || this.map.baseLayer.units;
+ var targetUnits = this.ovmap.getProjectionObject().getUnits() ||
+ this.ovmap.units || this.ovmap.baseLayer.units;
+ this.resolutionFactor = sourceUnits && targetUnits ?
+ OpenLayers.INCHES_PER_UNIT[sourceUnits] /
+ OpenLayers.INCHES_PER_UNIT[targetUnits] : 1;
+ }
+ },
+
+ /**
+ * Method: updateRectToMap
+ * Updates the extent rectangle position and size to match the map extent
+ */
+ updateRectToMap: function() {
+ // If the projections differ we need to reproject
+ var bounds;
+ if (this.ovmap.getProjection() != this.map.getProjection()) {
+ bounds = this.map.getExtent().transform(
+ this.map.getProjectionObject(),
+ this.ovmap.getProjectionObject() );
+ } else {
+ bounds = this.map.getExtent();
+ }
+ var pxBounds = this.getRectBoundsFromMapBounds(bounds);
+ if (pxBounds) {
+ this.setRectPxBounds(pxBounds);
+ }
+ },
+
+ /**
+ * Method: updateMapToRect
+ * Updates the map extent to match the extent rectangle position and size
+ */
+ updateMapToRect: function() {
+ var lonLatBounds = this.getMapBoundsFromRectBounds(this.rectPxBounds);
+ if (this.ovmap.getProjection() != this.map.getProjection()) {
+ lonLatBounds = lonLatBounds.transform(
+ this.ovmap.getProjectionObject(),
+ this.map.getProjectionObject() );
+ }
+ this.map.panTo(lonLatBounds.getCenterLonLat());
+ },
+
+ /**
+ * 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);
+ var width = Math.max(right - left, 0);
+ var height = Math.max(bottom - top, 0);
+ if(width < this.minRectSize || height < this.minRectSize) {
+ this.extentRectangle.className = this.displayClass +
+ this.minRectDisplayClass;
+ var rLeft = left + (width / 2) - (this.minRectSize / 2);
+ var rTop = top + (height / 2) - (this.minRectSize / 2);
+ this.extentRectangle.style.top = Math.round(rTop) + 'px';
+ this.extentRectangle.style.left = Math.round(rLeft) + 'px';
+ this.extentRectangle.style.height = this.minRectSize + 'px';
+ this.extentRectangle.style.width = this.minRectSize + 'px';
+ } else {
+ this.extentRectangle.className = this.displayClass +
+ 'ExtentRectangle';
+ this.extentRectangle.style.top = Math.round(top) + 'px';
+ this.extentRectangle.style.left = Math.round(left) + 'px';
+ this.extentRectangle.style.height = Math.round(height) + 'px';
+ this.extentRectangle.style.width = Math.round(width) + 'px';
+ }
+ this.rectPxBounds = new OpenLayers.Bounds(
+ Math.round(left), Math.round(bottom),
+ Math.round(right), Math.round(top)
+ );
+ },
+
+ /**
+ * Method: getRectBoundsFromMapBounds
+ * Get the rect bounds from the map bounds.
+ *
+ * Parameters:
+ * lonLatBounds - {<OpenLayers.Bounds>}
+ *
+ * Returns:
+ * {<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 leftBottomPx = this.getOverviewPxFromLonLat({
+ lon: lonLatBounds.left,
+ lat: lonLatBounds.bottom
+ });
+ var rightTopPx = this.getOverviewPxFromLonLat({
+ lon: lonLatBounds.right,
+ lat: lonLatBounds.top
+ });
+ 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>}
+ *
+ * Returns:
+ * {<OpenLayers.Bounds>} Bounds which is the passed-in overview rect bounds
+ * translated into lon/lat bounds for the overview map
+ */
+ getMapBoundsFromRectBounds: function(pxBounds) {
+ var leftBottomLonLat = this.getLonLatFromOverviewPx({
+ x: pxBounds.left,
+ y: pxBounds.bottom
+ });
+ var rightTopLonLat = this.getLonLatFromOverviewPx({
+ x: pxBounds.right,
+ y: pxBounds.top
+ });
+ 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>|Object} OpenLayers.Pixel or
+ * an object with a
+ * 'x' and 'y' properties.
+ *
+ * Returns:
+ * {Object} Location which is the passed-in overview map
+ * OpenLayers.Pixel, translated into lon/lat by the overview
+ * map. An object with a 'lon' and 'lat' properties.
+ */
+ getLonLatFromOverviewPx: function(overviewMapPx) {
+ var size = this.ovmap.size;
+ var res = this.ovmap.getResolution();
+ var center = this.ovmap.getExtent().getCenterLonLat();
+
+ var deltaX = overviewMapPx.x - (size.w / 2);
+ var deltaY = overviewMapPx.y - (size.h / 2);
+
+ return {
+ lon: center.lon + deltaX * res,
+ lat: center.lat - deltaY * res
+ };
+ },
+
+ /**
+ * Method: getOverviewPxFromLonLat
+ * Get a pixel location from a map location
+ *
+ * Parameters:
+ * lonlat - {<OpenLayers.LonLat>|Object} OpenLayers.LonLat or an
+ * object with a 'lon' and 'lat' properties.
+ *
+ * Returns:
+ * {Object} 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();
+ if (extent) {
+ return {
+ x: Math.round(1/res * (lonlat.lon - extent.left)),
+ y: Math.round(1/res * (extent.top - lonlat.lat))
+ };
+ }
+ },
+
+ CLASS_NAME: 'OpenLayers.Control.OverviewMap'
+});
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 14:36:15 +0000