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leinfelder
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<title>
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<a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008 Overview
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<em>
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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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<p>
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No overview generated for 'Extent.js'<BR/><BR/>
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<b>Class Summary</b>
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</font></td>
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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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</tr>
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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] );
|
296 |
|
|
<span class="reserved">return</span> new Array(p,l);
|
297 |
|
|
}
|
298 |
|
|
|
299 |
|
|
<span class="comment">/**
|
300 |
|
|
* Adjust the extent so that it is centered at given XY coordinate with given
|
301 |
|
|
* resolution. Extent width and height remain fixed. Optionally check to
|
302 |
|
|
* ensure that it doesn't go beyond available extent.
|
303 |
|
|
*
|
304 |
|
|
* <span class="attrib">@param</span> center projection XY coordinate to center at
|
305 |
|
|
* <span class="attrib">@param</span> newres resolution to display at
|
306 |
|
|
* <span class="attrib">@param</span> limitExtent ensure that the extent doesn't go beyond available bbox (TBD: not complete/tested)
|
307 |
|
|
* <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>
|
477 |
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|
480 |
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<!-- ========== START OF NAVBAR ========== -->
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<td bgcolor="#EEEEFF" class="NavBarCell1"> <a href="overview-summary.html"><font class="NavBarFont1"><b>Overview</b></font></a> </td>
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<td bgcolor="#FFFFFF" class="NavBarCell1"> <font class="NavBarFont1">Class</font> </td>
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</td>
|
501 |
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<td bgcolor="#EEEEFF" align="right" valign="top"><em>
|
502 |
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<b><a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008</b></em>
|
503 |
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</td>
|
504 |
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|
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<script>
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<!--
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531 |
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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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