root/Chameleon/trunk/Chameleon/ZoomSelectedLayers/ZoomSelectedLayers.widget.php

<?php
/**
 * ZoomSelectedLayers Widget class
 *
 * @project     CWC2
 * @revision    $Id: ZoomSelectedLayers.widget.php,v 1.11 2005/01/25 16:00:19 jfournier Exp $
 * @purpose     Zoom Selected Layers Widget class
 * @author      DM Solutions Group (spencer@dmsolutions.ca)
 * @copyright
 * <b>Copyright (c) 2002, DM Solutions Group Inc.</b>
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

include_once(dirname(__FILE__)."/../NavTool.php");

/**
 * ZoomSelectedLayersWidget
 *
 * @desc ZoomSelectedLayers widget.
 */
class ZoomSelectedLayers extends NavTool
{
    var $mnBuffer = 0.01;

    /**
     * ZoomSelectedLayersWidget
     *
     * Constructor. Set the default values.
     */
    function ZoomSelectedLayers()
    {
        // invoke constructor of parent
        parent::NavTool();
        $this->SetNavCommand( "ZOOM_SELECTED" );
        $this->mbSubmitOnClick = true;
        
        // set the description for this widget
        $this->szWidgetDescription = "Zoom to the extents of the selected layers plus a small (1%) buffer";
        
        $this->maAttributes['BUFFER'] = new IntegerAttribute( 'BUFFER', false, 0, 100 );
        $this->mnMaturityLevel = MATURITY_BETA;
    }
    
    function InitDefaults()
    {
        parent::InitDefaults();
        if (isset($this->maParams['BUFFER']))
        {
            $this->mnBuffer = $this->maParams['BUFFER'] / 100;
        }
    }

    /**
     * ParseURL
     *
     * Look for the ZOOM_IN command and if founddo the zooming
     * according to the other NAV paramaters.
     */
    function  ParseURL()
    {
        parent::ParseURL();
        
        //sanity test on getextent function
        if ($this->moMapObject->oMap->numlayers == 0)
            return true;
        
        $oLayer=$this->moMapObject->oMap->getLayer(0);
        if (!method_exists( $oLayer, "getextent" ))
        {
            $_SESSION['gErrorManager']->setError(ERR_WARNING, "The version of mapscript that you are using is not supported by the ZoomSelectedLayers widget.  You must use version 4.2.3+ or version 4.4.0+ (beta2 does not work)");
            return false;
        }
        
        $szCmd = "";
        if ($this->isVarSet( "NAV_CMD" ))
          $szCmd = trim($this->getVar( "NAV_CMD" ));
          
        if ($szCmd == "ZOOM_SELECTED")
        {
            //handle ZoomSelectedLayers here.
            $szOriginalExtents = trim($this->moMapObject->oMap->getMetaData( "original_extents" ));
            $szOriginalProjection = $this->moMapObject->oMap->getMetaData( "original_projection" );
            if (strlen($szOriginalExtents) > 0)
            {
                $aszExtents = explode(",", $szOriginalExtents);
                if (count($aszExtents) == 4)
                {
                        if ($szOriginalProjection != "" && $szOriginalProjection != $this->moMapObject->oMap->getprojection())
                        {
                            $aszExtents = $this->moMapNavigator->reprojectExtentFromCenter($aszExtents, $this->moMapObject->oMap->width, $this->moMapObject->oMap->height, $szOriginalProjection,$this->moMapObject->oMap->getProjection());
                        }
                }
            }
            $szMapProj = $this->moMapObject->oMap->getProjection();
            $oMapProj = ms_newProjectionObj( $szMapProj );
            $oQueryExtent = ms_newRectObj();
            $oQueryExtent->setextent( $aszExtents[0],$aszExtents[1],$aszExtents[2],$aszExtents[3] );
            for($i=0; $i<$this->moMapObject->oMap->numlayers;$i++)
            {
                $oLayer = $this->moMapObject->oMap->getLayer($i);
                if ($oLayer->getMetaData( "selected" ) == "1" )
                {
                    @$oLayer->queryByRect( $oQueryExtent );
                    if ($oLayer->getNumResults() > 0)
                    {
                        $nResults = $oLayer->getNumResults();
                        $oBBox = $oLayer->getExtent();
                        
                        $szLayerProj = $oLayer->getProjection();
                        if ($szLayerProj != $szMapProj)
                        {
                            $oLayerProj = ms_newProjectionObj( $szLayerProj );
                            $oBBox->project( $oLayerProj, $oMapProj );
                        }
                    }
                }
                
            }
            if (isset($oBBox))
            {
                $width = ($oBBox->maxx - $oBBox->minx) * $this->mnBuffer;
                $height = ($oBBox->maxy - $oBBox->miny) * $this->mnBuffer;
                
                if( $width == 0 || $height == 0 )
                {
                    /*
                     * if projection is not lat/lon
                     * change point to lat/lon
                     * calculate 1 degree buffer as rect object
                     * reproject rect obj back into orig proj
                     * calculate new width/height
                     */
                     if( $szMapProj != "init=epsg:4326" )
                     {
                        $oLLProj = ms_newprojectionobj( "init=epsg:4326" );
                        $oBBox->project( $oMapProj, $oLLProj );
                     }
                     $oBBox->setextent( $oBBox->minx - 0.5, $oBBox->miny - 0.5, $oBBox->maxx + 0.5, $oBBox->maxy + 0.5 );
                     if( $szMapProj != "init=epsg:4326" )
                     {
                         $oBBox->project( $oLLProj, $oMapProj );
                     }
                     $width = ($oBBox->maxx - $oBBox->minx);
                     $height = ($oBBox->maxy - $oBBox->miny);
                }
                
                //echo 'minx: ' . ($oBBox->minx - $width ). ', miny: ' . ($oBBox->miny - $height ). ', maxx: ' . ($oBBox->maxx+$width ). ', maxy: ' .( $oBBox->maxy + $height ). '<br><br>';
                $this->moMapObject->oMap->setextent( $oBBox->minx - $width, $oBBox->miny - $height, $oBBox->maxx+$width, $oBBox->maxy + $height );
            }
                
        }        
        // return success
        return true;
    }
}
?>