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<a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008 Overview
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<b><a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008</b></em>
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<h2>Extent.js</h2>
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<h4>Summary</h4>
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No overview generated for 'Extent.js'<BR/><BR/>
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<b>Class Summary</b>
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</tr>
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<tr bgcolor="white" class="TableRowColor">
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<td width="15%"><b><a href="Extent.html">Extent</a></b></td>
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<td> </td>
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</table>
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<hr/>
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<!-- ========== METHOD SUMMARY =========== -->
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<!-- ========== END METHOD SUMMARY =========== -->
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<pre class="sourceview"><span class="comment">/*
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Author: Mike Adair mike.adairATccrs.nrcan.gc.ca
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: Extent.js 3067 2007-08-03 09:25:59Z jseb.baklouti $
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*/</span>
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var Rearth = 6378137.0; // Radius of the earth (sphere); different from Proj value?
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var degToMeter = Rearth*2*Math.PI/360;
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<span class="comment">//var mbScaleFactor = 72 * 39.3701; //PixelsPerInch*InchesPerMapUnit; magic numbers </span>
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<span class="comment"> //need to determine magic number for lat/lon</span>
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var mbScaleFactor = 3571.428; //magic number, <span class="reserved">for</span> Geoserver SLD compatibility
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<span class="comment"> // 1/0.00028 (0.28 mm "is a common actual size for</span>
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<span class="comment"> // contemporary display" as written in the SLD specification ...</span>
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<span class="comment">/*
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* FD 2005/03/04 : minScale et maxScale
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* DGR : should be in config ?
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*/</span>
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var minScale = 1000;
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var maxScale = 200000;
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<span class="comment">/**
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* A tool designed to handle geography calculations for widgets which render
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* the model in 2D.
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* Use of this tool requires that it's model implements get/setWindowHeight/Width
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* methods.
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* Encapsulates all geography and image size aspects of a geographic object
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* displayed in a rectangular area on the screen.
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* All coordinates are handled as points which is a 2 element array, where x is
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* the first element and y is the second. Coordinates are either pixel and lixel
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* (pl) relative to the top left of the extent or projection XY values (xy).
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*
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* <span class="attrib">@constructor</span>
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* <span class="attrib">@param</span> model the model document that this extent represents
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* <span class="attrib">@param</span> initialRes (optional) if supplied the extent resolution will be set to this value
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*/</span>
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<span class="reserved">function</span> Extent( model, initialRes ) {
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<span class="reserved">this</span>.model = model;
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<span class="reserved">this</span>.id = model.id + <span class="literal">"_MbExtent"</span> + mbIds.getId();
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<span class="reserved">this</span>.size = new Array();
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<span class="reserved">this</span>.res = new Array();
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<span class="reserved">this</span>.zoomBy = 4;
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<span class="comment">/**
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* Returns the bounding box as stored in the model
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* <span class="attrib">@return</span> array with the bounding box
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*/</span>
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<span class="reserved">this</span>.getBbox = <span class="reserved">function</span>() {
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var bbox = <span class="reserved">this</span>.model.getBoundingBox();
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<span class="reserved">return</span> bbox;
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}
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<span class="comment">/**
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* Recalculates a given bbox and stores a proper aspect one in the model
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* <span class="attrib">@param</span> bbox an array with a bounding box
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*/</span>
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<span class="reserved">this</span>.setBbox = <span class="reserved">function</span>(bbox){
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size = <span class="reserved">this</span>.getSize();
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res = Math.max((bbox[2] - bbox[0])/size[0], (bbox[3] - bbox[1])/size[1]);
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scale=<span class="reserved">this</span>.getFixedScale(res);
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center = new Array((bbox[1]-bbox[3])/2,(bbox[0]-bbox[2])/2);//center=horizontal,vertical
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half = new Array(size[0]/2,size[1]/2);
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bbox = new Array(center[0]-half[0]*scale, center[1]-half[1]*scale, center[0]+half[0]*scale,center[1]+half[1]*scale);
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<span class="reserved">this</span>.model.setBoundingBox(bbox);
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}
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<span class="comment">/**
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* Returns the window size as stored in the model
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* <span class="attrib">@return</span> array with the window size
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*/</span>
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<span class="reserved">this</span>.getSize = <span class="reserved">function</span>() {
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size= new Array();
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size[0] = <span class="reserved">this</span>.model.getWindowWidth();
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size[1] = <span class="reserved">this</span>.model.getWindowHeight();
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<span class="reserved">return</span> size;
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}
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<span class="comment">/**
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* Stores a given window size in the model.
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* Can be used in the future for dynamic window resizing
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* <span class="attrib">@param</span> size an array with a window size
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*/</span>
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<span class="reserved">this</span>.setSize = <span class="reserved">function</span>(size){
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<span class="reserved">this</span>.model.setWindowWidth(size[0]);
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<span class="reserved">this</span>.model.setWindowHeight(size[1]);
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}
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<span class="comment">/**
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* When given a res, it recalculates it to match the zoomlevels, when present and returns a fixed scale.
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* When no res is given it returns the maximum resolution
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* <span class="attrib">@param</span> res optional resolution to be checked
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* <span class="attrib">@return</span> fixedScale the resolution to display the map with
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*/</span>
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<span class="reserved">this</span>.getFixedScale = <span class="reserved">function</span>(res) {
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<span class="reserved">if</span> (<span class="reserved">this</span>.zoomLevels){
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<span class="reserved">if</span> (!res) {
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<span class="reserved">this</span>.setResolution( new Array(<span class="reserved">this</span>.model.getWindowWidth(), <span class="reserved">this</span>.model.getWindowHeight() ) );
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res = Math.max(<span class="reserved">this</span>.res[0],<span class="reserved">this</span>.res[1]);
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}
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var sortstring = <span class="literal">"function sort(a,b){return b-a}"</span>;
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var evalsort= eval(sortstring);
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var zoomLevels = <span class="reserved">this</span>.zoomLevels.sort(evalsort);
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var i=0;
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<span class="reserved">while</span>(zoomLevels[i] >= res){
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i++;
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}
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<span class="reserved">if</span>(i==0) {
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i=1;
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}
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<span class="reserved">this</span>.fixedScale = zoomLevels[i-1];
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}
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<span class="reserved">else</span> <span class="reserved">this</span>.fixedScale = Math.max(<span class="reserved">this</span>.res[0],<span class="reserved">this</span>.res[1]);
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<span class="reserved">return</span> <span class="reserved">this</span>.fixedScale;
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}
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<span class="comment">/*
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* Sets the zoomLevels in the extent
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* <span class="attrib">@param</span> enabled boolean to enable or disable zoomLevels support
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* <span class="attrib">@param</span> zoomLevels an array containing a fixed set of zoomLevels
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*/</span>
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<span class="reserved">this</span>.setZoomLevels = <span class="reserved">function</span>(enabled,zoomLevels){
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<span class="reserved">if</span>(enabled) {
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<span class="reserved">this</span>.zoomLevels = zoomLevels;
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}
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<span class="reserved">else</span> <span class="reserved">this</span>.zoomLevels = null;
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}
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<span class="comment">/*
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* Recalculates the lr and ul to a proper aspect. It also takes into account zoomLevels when present.
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*/</span>
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<span class="reserved">this</span>.checkBbox = <span class="reserved">function</span>() {
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var center = <span class="reserved">this</span>.getCenter();
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var half = new Array(<span class="reserved">this</span>.size[0]/2, <span class="reserved">this</span>.size[1]/2);
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var res = <span class="reserved">this</span>.getFixedScale();
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<span class="reserved">this</span>.lr = new Array(center[0]+half[0]*res, center[1]-half[1]*res);
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<span class="reserved">this</span>.ul = new Array(center[0]-half[0]*res, center[1]+half[1]*res);
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}
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<span class="comment">/**
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* Returns the XY center of this extent
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* <span class="attrib">@return</span> array of XY for th center of the extent
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*/</span>
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<span class="reserved">this</span>.getCenter = <span class="reserved">function</span>() {
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<span class="reserved">return</span> new Array((<span class="reserved">this</span>.ul[0]+<span class="reserved">this</span>.lr[0])/2, (<span class="reserved">this</span>.ul[1]+<span class="reserved">this</span>.lr[1])/2);
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}
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<span class="comment">/**
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* Returns XY coordinates for given pixel line coords w.r.t. top left corner
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* <span class="attrib">@param</span> pl pixel line in extent to calculate
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* <span class="attrib">@return</span> point array of XY coordinates
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*/</span>
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<span class="reserved">this</span>.getXY = <span class="reserved">function</span>(pl) {
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<span class="comment"> //switch(this.model.getSRS()) {</span>
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<span class="comment"> // case "EPSG:GMAPS": //<span class="attrib">@TODO</span> Cleanup this hack</span>
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<span class="comment"> // gmap=this.model.getParam("gmap");</span>
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<span class="comment"> // if(gmap){</span>
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<span class="comment"> // p=new GPoint(pl[0],pl[1]);</span>
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<span class="comment"> // latlng=gmap.fromDivPixelToLatLng(p);</span>
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<span class="comment"> // latlng=new Array(latlng.lng(),latlng.lat());</span>
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<span class="comment"> // }</span>
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<span class="comment"> // else alert("Extent: gmap not defined");</span>
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<span class="comment"> // break;</span>
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<span class="comment"> // default:</span>
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<span class="comment"> // latlng=new Array(this.ul[0]+pl[0]*this.res[0],this.ul[1]- pl[1]*this.res[1]);</span>
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<span class="comment"> // break;</span>
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<span class="comment"> //}</span>
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latlng=new Array(<span class="reserved">this</span>.ul[0]+pl[0]*<span class="reserved">this</span>.res[0],<span class="reserved">this</span>.ul[1]- pl[1]*<span class="reserved">this</span>.res[1]);
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<span class="reserved">return</span> latlng;
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}
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<span class="comment">/**
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* Returns pixel/line coordinates for given XY projection coords
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* <span class="attrib">@param</span> xy projection XY coordinate to calculate
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* <span class="attrib">@return</span> point array of pxiel/line coordinates w.r.t. top left corner
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*/</span>
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<span class="reserved">this</span>.getPL = <span class="reserved">function</span>(xy) {
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<span class="comment"> //switch(this.model.getSRS()) {</span>
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<span class="comment"> // case "EPSG:GMAPS": //<span class="attrib">@TODO</span> Cleanup this hack</span>
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<span class="comment"> // return xy;</span>
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<span class="comment"> //}</span>
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var p = Math.floor( (xy[0]-<span class="reserved">this</span>.ul[0])/<span class="reserved">this</span>.res[0] );
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var l = Math.floor( (<span class="reserved">this</span>.ul[1]-xy[1])/<span class="reserved">this</span>.res[1] );
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<span class="reserved">return</span> new Array(p,l);
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}
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<span class="comment">/**
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* Adjust the extent so that it is centered at given XY coordinate with given
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* resolution. Extent width and height remain fixed. Optionally check to
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* ensure that it doesn't go beyond available extent.
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*
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* <span class="attrib">@param</span> center projection XY coordinate to center at
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* <span class="attrib">@param</span> newres resolution to display at
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* <span class="attrib">@param</span> limitExtent ensure that the extent doesn't go beyond available bbox (TBD: not complete/tested)
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* <span class="attrib">@return</span> none
|
|
308
|
*/</span>
|
|
309
|
<span class="reserved">this</span>.centerAt = <span class="reserved">function</span>(center, newres, limitExtent) {
|
|
310
|
var half = new Array(<span class="reserved">this</span>.size[0]/2, <span class="reserved">this</span>.size[1]/2);
|
|
311
|
<span class="comment">/*
|
|
312
|
* FD 2005/03/04 : respect de minScale et maxScale
|
|
313
|
* DGR : scale constraints
|
|
314
|
var nRmin= minScale/mbScaleFactor;
|
|
315
|
var nRmax= maxScale/mbScaleFactor;
|
|
316
|
if (newres < nRmin) {
|
|
317
|
newres= nRmin ;
|
|
318
|
}
|
|
319
|
if (newres > nRmax) {
|
|
320
|
newres= nRmax ;
|
|
321
|
}
|
|
322
|
*/</span>
|
|
323
|
<span class="reserved">if</span> (<span class="reserved">this</span>.zoomLevels) {
|
|
324
|
newres=<span class="reserved">this</span>.getFixedScale(newres);
|
|
325
|
}
|
|
326
|
<span class="reserved">this</span>.lr = new Array(center[0]+half[0]*newres, center[1]-half[1]*newres);
|
|
327
|
<span class="reserved">this</span>.ul = new Array(center[0]-half[0]*newres, center[1]+half[1]*newres);
|
|
328
|
<span class="comment">
|
|
329
|
//make sure the request doesn't extend beyond the available model</span>
|
|
330
|
<span class="comment"> //TBD this block not tested</span>
|
|
331
|
<span class="reserved">if</span> ( limitExtent ) {
|
|
332
|
var xShift = 0;
|
|
333
|
<span class="reserved">if</span> ( <span class="reserved">this</span>.lr[0] > ContextExtent.lr[0] ) xShift = ContextExtent.lr[0] - <span class="reserved">this</span>.lr[0];
|
|
334
|
<span class="reserved">if</span> ( <span class="reserved">this</span>.ul[0] < ContextExtent.ul[0] ) xShift = ContextExtent.ul[0] - <span class="reserved">this</span>.ul[0];
|
|
335
|
<span class="reserved">this</span>.lr[0] += xShift;
|
|
336
|
<span class="reserved">this</span>.ul[0] += xShift;
|
|
337
|
|
|
338
|
var yShift = 0;
|
|
339
|
<span class="reserved">if</span> ( <span class="reserved">this</span>.lr[1] < ContextExtent.lr[1] ) yShift = ContextExtent.lr[1] - <span class="reserved">this</span>.lr[1];
|
|
340
|
<span class="reserved">if</span> ( <span class="reserved">this</span>.ul[1] > ContextExtent.ul[1] ) yShift = ContextExtent.ul[1] - <span class="reserved">this</span>.ul[1];
|
|
341
|
<span class="reserved">this</span>.lr[1] += yShift;
|
|
342
|
<span class="reserved">this</span>.ul[1] += yShift;
|
|
343
|
}
|
|
344
|
|
|
345
|
<span class="reserved">this</span>.model.setBoundingBox( new Array(<span class="reserved">this</span>.ul[0], <span class="reserved">this</span>.lr[1], <span class="reserved">this</span>.lr[0], <span class="reserved">this</span>.ul[1]) );
|
|
346
|
<span class="comment"> //this.setResolution(size);</span>
|
|
347
|
<span class="reserved">this</span>.setSize(newres);
|
|
348
|
}
|
|
349
|
|
|
350
|
<span class="comment">/**
|
|
351
|
* Adjust the extent to the given bbox. Resolution is recalculated.
|
|
352
|
* Extent width and height remain fixed.
|
|
353
|
* <span class="attrib">@param</span> ul upper left coordinate of bbox in XY projection coords
|
|
354
|
* <span class="attrib">@param</span> lr lower right coordinate of bbox in XY projection coords
|
|
355
|
*/</span>
|
|
356
|
<span class="reserved">this</span>.zoomToBox = <span class="reserved">function</span>(ul, lr) { //pass in xy
|
|
357
|
var center = new Array((ul[0]+lr[0])/2, (ul[1]+lr[1])/2);
|
|
358
|
newres = Math.max((lr[0] - ul[0])/<span class="reserved">this</span>.size[0], (ul[1] - lr[1])/<span class="reserved">this</span>.size[1]);
|
|
359
|
<span class="reserved">this</span>.centerAt( center, newres );
|
|
360
|
}
|
|
361
|
|
|
362
|
<span class="comment">/**
|
|
363
|
* Adjust the width and height to that bbox is displayed at specified resolution
|
|
364
|
* <span class="attrib">@param</span> res the resolution to be set
|
|
365
|
*/</span>
|
|
366
|
<span class="comment"> //TBD update the model doc</span>
|
|
367
|
<span class="reserved">this</span>.setSize = <span class="reserved">function</span>(res) { //pass in a resolution and width, height are recalculated
|
|
368
|
<span class="reserved">this</span>.res[0] = <span class="reserved">this</span>.res[1] = res;
|
|
369
|
<span class="reserved">this</span>.size[0] = (<span class="reserved">this</span>.lr[0] - <span class="reserved">this</span>.ul[0])/<span class="reserved">this</span>.res[0];
|
|
370
|
<span class="reserved">this</span>.size[1] = (<span class="reserved">this</span>.ul[1] - <span class="reserved">this</span>.lr[1])/<span class="reserved">this</span>.res[1];
|
|
371
|
<span class="reserved">this</span>.width = Math.ceil(<span class="reserved">this</span>.size[0]);
|
|
372
|
<span class="reserved">this</span>.height = Math.ceil(<span class="reserved">this</span>.size[1]);
|
|
373
|
}
|
|
374
|
|
|
375
|
<span class="comment">/**
|
|
376
|
* Adjust the resolution so the bbox fits in the specified width and height
|
|
377
|
* <span class="attrib">@param</span> size width, height array passed in
|
|
378
|
*/</span>
|
|
379
|
<span class="comment"> //TBD update the model doc</span>
|
|
380
|
<span class="reserved">this</span>.setResolution = <span class="reserved">function</span>(size) { //pass in a width, height and res is recalculated
|
|
381
|
<span class="reserved">this</span>.size[0] = size[0];
|
|
382
|
<span class="reserved">this</span>.size[1] = size[1];
|
|
383
|
<span class="reserved">this</span>.res[0] = (<span class="reserved">this</span>.lr[0] - <span class="reserved">this</span>.ul[0])/<span class="reserved">this</span>.size[0];
|
|
384
|
<span class="reserved">this</span>.res[1] = (<span class="reserved">this</span>.ul[1] - <span class="reserved">this</span>.lr[1])/<span class="reserved">this</span>.size[1];
|
|
385
|
<span class="reserved">this</span>.width = Math.ceil(<span class="reserved">this</span>.size[0]);
|
|
386
|
<span class="reserved">this</span>.height = Math.ceil(<span class="reserved">this</span>.size[1]);
|
|
387
|
}
|
|
388
|
|
|
389
|
<span class="comment">/**
|
|
390
|
* Returns the map scale denominator for the current extent resolution
|
|
391
|
* <span class="attrib">@return</span> map scale denominator
|
|
392
|
*/</span>
|
|
393
|
<span class="reserved">this</span>.getScale = <span class="reserved">function</span>() {
|
|
394
|
var pixRes = null;
|
|
395
|
switch(<span class="reserved">this</span>.model.getSRS()) {
|
|
396
|
case <span class="literal">"EPSG:GMAPS"</span>:
|
|
397
|
break;
|
|
398
|
case <span class="literal">"EPSG:4326"</span>: //all projection codes in degrees
|
|
399
|
case <span class="literal">"EPSG:4269"</span>:
|
|
400
|
pixRes = <span class="reserved">this</span>.res[0]*degToMeter;
|
|
401
|
break;
|
|
402
|
default: //all projection codes in meters
|
|
403
|
pixRes = <span class="reserved">this</span>.res[0];
|
|
404
|
break;
|
|
405
|
}
|
|
406
|
<span class="reserved">return</span> mbScaleFactor*pixRes;
|
|
407
|
}
|
|
408
|
|
|
409
|
<span class="comment">/**
|
|
410
|
* Sets the model's resolution from mapScale input value. The map center
|
|
411
|
* remains fixed.
|
|
412
|
* <span class="attrib">@param</span> scale map scale denominator value
|
|
413
|
*/</span>
|
|
414
|
<span class="reserved">this</span>.setScale = <span class="reserved">function</span>(scale) {
|
|
415
|
var newRes = null;
|
|
416
|
<span class="comment">/*
|
|
417
|
* FD 2005/03/04
|
|
418
|
* On contraint l'echelle min et max de l'application.
|
|
419
|
* A externaliser dans le fichier de config de l'application ;-)
|
|
420
|
* DGR : should be in the config
|
|
421
|
if (scale < minScale) {
|
|
422
|
scale= minScale ;
|
|
423
|
}
|
|
424
|
if (scale > maxScale) {
|
|
425
|
scale= maxScale ;
|
|
426
|
}
|
|
427
|
*/</span>
|
|
428
|
switch(<span class="reserved">this</span>.model.getSRS()) {
|
|
429
|
case <span class="literal">"EPSG:4326"</span>: //all projection codes in degrees
|
|
430
|
case <span class="literal">"EPSG:4269"</span>:
|
|
431
|
<span class="comment"> //convert to resolution in degrees</span>
|
|
432
|
newRes = scale/(mbScaleFactor*degToMeter);
|
|
433
|
break;
|
|
434
|
default: //all projection codes in meters
|
|
435
|
newRes = scale/mbScaleFactor;
|
|
436
|
break;
|
|
437
|
}
|
|
438
|
<span class="reserved">this</span>.centerAt(<span class="reserved">this</span>.getCenter(), newRes );
|
|
439
|
}
|
|
440
|
|
|
441
|
|
|
442
|
<span class="comment">/**
|
|
443
|
* Initialization of the Extent tool, called as a loadModel event listener.
|
|
444
|
* <span class="attrib">@param</span> extent the object being initialized
|
|
445
|
* <span class="attrib">@param</span> initialRes (optional) if supplied the extent resolution will be set to this value
|
|
446
|
*/</span>
|
|
447
|
<span class="reserved">this</span>.init = <span class="reserved">function</span>(extent, initialRes) {
|
|
448
|
var bbox = extent.model.getBoundingBox();
|
|
449
|
extent.ul = new Array(bbox[0],bbox[3]);
|
|
450
|
extent.lr = new Array(bbox[2],bbox[1]);
|
|
451
|
<span class="comment">/*
|
|
452
|
TBD: when called as a listener this gets a bbox array passed in, not initialRes value
|
|
453
|
if ( initialRes ) {
|
|
454
|
extent.setSize( initialRes );
|
|
455
|
} else {
|
|
456
|
extent.setResolution( new Array(extent.model.getWindowWidth(), extent.model.getWindowHeight() ) );
|
|
457
|
}
|
|
458
|
*/</span>
|
|
459
|
extent.setResolution( new Array(extent.model.getWindowWidth(), extent.model.getWindowHeight() ) );
|
|
460
|
extent.checkBbox();
|
|
461
|
}
|
|
462
|
<span class="reserved">if</span> ( initialRes ) <span class="reserved">this</span>.init(<span class="reserved">this</span>, initialRes);
|
|
463
|
|
|
464
|
|
|
465
|
<span class="reserved">this</span>.firstInit = <span class="reserved">function</span>(extent, initialRes) {
|
|
466
|
extent.init(extent, initialRes);
|
|
467
|
<span class="comment"> //TBD: this causes 2 paint() calls on initial load, not sure why it's here - MA</span>
|
|
468
|
<span class="comment"> //extent.zoomToBox(extent.ul,extent.lr);</span>
|
|
469
|
}
|
|
470
|
|
|
471
|
}
|
|
472
|
|
|
473
|
|
|
474
|
|
|
475
|
</pre>
|
|
476
|
<hr>
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477
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480
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481
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485
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486
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</td>
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501
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<td bgcolor="#EEEEFF" align="right" valign="top"><em>
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502
|
<b><a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008</b></em>
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503
|
</td>
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504
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511
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512
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515
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516
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517
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518
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519
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521
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522
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523
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524
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528
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529
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531
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532
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533
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<div class="jsdoc_ctime">Documentation generated by <a href="http://jsdoc.sourceforge.net/" target="_parent">JSDoc</a> on Sun Apr 27 20:30:54 2008</div>
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534
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