[mapserver-users] Can anyone help me please???/

[ramya srinivasan]

HI,
 I have to display the user clicked point on the map. But i don get the
point in the map.. Can any one please correct my code..
<?php
dl('php_mapscript.dll');
 // Default values and configuration
$map_file="./usa12.map";
$map = ms_newMapObj($map_file);
if ( isset($HTTP_POST_VARS["mapa_x"]) && isset($HTTP_POST_VARS["mapa_y"]))
 {
      $my_point = ms_newpointObj();
      $my_point->setXY($HTTP_POST_VARS["mapa_x"],$HTTP_POST_VARS["mapa_y"]);
      $nGeoX = Pix2Geo($my_point->x, 0,$map->width , $map->extext->minx,
$map->extent->maxx, 0);
      $nGeoY = Pix2Geo($my_point->y, 0, $map->height, $map->extent->miny,
$map->extent->maxy, 1);
      $point=ms_newpointobj();
      $point->setXY($nGeoX,$nGeoY);
$layer=$map->getLayerByName("US state boundaries");
if (@$layer->queryByPoint($point,MS_SINGLE ,0) == MS_SUCCESS)
{
$image_from_query=$map->drawQuery();
$image_from_query_url=$image_from_query->saveWebImage();
}
}
function Pix2Geo($nPixPos, $dfPixMin, $dfPixMax, $dfGeoMin, $dfGeoMax,
$nInversePix)
{

    $dfWidthGeo = $dfGeoMax - $dfGeoMin;
    $dfWidthPix = $dfPixMax - $dfPixMin;


    $dfPixToGeo = $dfWidthGeo / $dfWidthPix;

    if (!$nInversePix)
        $dfDeltaPix = $nPixPos - $dfPixMin;
    else
        $dfDeltaPix = $dfPixMax - $nPixPos;

    $dfDeltaGeo = $dfDeltaPix * $dfPixToGeo;


    $dfPosGeo = $dfGeoMin + $dfDeltaGeo;



    return ($dfPosGeo);

}
 $image=$map->draw();
 $image_url=$image->saveWebImage();
?>
map file
MAP
    NAME USA1
    STATUS ON
    SIZE 800 500
    IMAGETYPE PNG
    IMAGECOLOR 200 200 200
    SHAPEPATH "C:\ms4w\Apache\data"
    EXTENT -8000000 300000 5000000 1500000
    UNITS METERS
    PROJECTION
        "proj=lcc" "lat_1=32" "lat_2=44" "lat_0=38" "lon_0=-100" "x_0=0"
"y_0=0" "ellps=GRS80" "datum=NAD83"
    END
    WEB
        IMAGEPATH "C:\ms4w\tmp\ms_tmp"
        IMAGEURL "C:\ms4w\tmp\ms_tmp"

    END

    LAYER
        NAME "US state boundaries"
        TYPE POLYGON
        STATUS ON
        DATA "statesp020"
        PROJECTION
            "proj=latlong"
            "ellps=GRS80"
            "datum=NAD83"
        END

        CLASS
            NAME "US states"
            OUTLINECOLOR 175 175 175
            COLOR 150 150 150
            SYMBOL 0
                      TEMPLATE "hello.html"
            END
    END

END
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