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/*
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id$
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*/
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// Ensure this object's dependancies are loaded.
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mapbuilder.loadScript(baseDir+"/widget/ButtonBase.js");
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mapbuilder.loadScript(baseDir+"/util/openlayers/OpenLayers.js");
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/**
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* When this button is selected, clicks on the MapPane trigger a Metacat query with the
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* currently set AOI.
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* @constructor
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* @base ButtonBase
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* @authors P. Mark Anderson anderson@nceas.ucsb.edu, Matthew Perry perry@nceas.ucsb.edu
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* @param widgetNode The widget node from the Config XML file.
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* @param model The model for this widget
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*/
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function AoiMetacatQuery(widgetNode, model) {
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// Extend ButtonBase
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ButtonBase.apply(this, new Array(widgetNode, model))
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// Grab the important values from the config file
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var metacat = widgetNode.selectSingleNode("mb:metacat").firstChild.nodeValue;
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var skin = widgetNode.selectSingleNode("mb:skin").firstChild.nodeValue;
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var tolerance = widgetNode.selectSingleNode("mb:pixel_tolerance").firstChild.nodeValue;
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var method = "popup";
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this.cursor = 'crosshair';
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this.createControl = function(objRef) {
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var Control =
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OpenLayers.Class(OpenLayers.Control, {
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/**
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* Property: type
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* {OpenLayers.Control.TYPE}
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*/
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type: OpenLayers.Control.TYPE_TOOL,
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/**
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* Property: out
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* {Boolean} Should the control be used for zooming out?
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*/
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out: false,
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/**
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* Method: draw
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*/
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draw: function() {
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this.handler = new OpenLayers.Handler.Box( this,
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{done: this.zoomBox}, {keyMask: this.keyMask} );
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},
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/**
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* Method: zoomBox
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* Queries metacat and displays the result in a popup window.
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* Parameters:
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* position - {<OpenLayers.Bounds>} or {<OpenLayers.Pixel>}
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*/
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zoomBox: function (position) {
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if (position instanceof OpenLayers.Bounds) {
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var minXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.left, position.bottom));
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var maxXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.right, position.top));
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var bounds = new OpenLayers.Bounds(minXY.lon, minXY.lat,
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maxXY.lon, maxXY.lat);
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//alert("bounds:" + bounds);
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// Determine the BBOX
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var x1 = bounds.left;
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var y1 = bounds.bottom;
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var x2 = bounds.right;
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var y2 = bounds.top;
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} else { // it's a pixel
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var minXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.x, position.y));
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var x1 = minXY.lon;
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var y1 = minXY.lat;
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var x2 = minXY.lon;
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var y2 = minXY.lat;
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}
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if ( x1 == x2 && y1 == y2 ) {
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// BBOX is really a point; give a bit of wiggle room
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// tolerance is number of pixels to buffer, set in config
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var extent = this.map.getExtent();
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var res = extent.getWidth() / this.map.size.w;
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//alert("res:" + res);
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x1 = x1 - tolerance * res;
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y1 = y1 - tolerance * res;
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x2 = x2 + tolerance * res;
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y2 = y2 + tolerance * res;
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}
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var url = metacat + "?action=spatial_query&xmin=" + x1 + "&xmax=" + x2 +
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"&ymin=" + y1 + "&ymax=" + y2 + "&skin=" + skin;
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if (method == 'popup') {
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newwindow = window.open(url,'queryWin',
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'height=600,width=800,status=yes,toolbar=yes,menubar=no,location=yes,resizable=yes,scrollbars=yes');
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if (window.focus) {newwindow.focus()}
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}
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},
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CLASS_NAME: "mbControl.AoiMetacatQuery"
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});
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return Control;
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}
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}
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