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Added experimental county electoral district lookup
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| <?php | ||
| function myWithin($myPolygon,$point) { | ||
| $counter = 0; | ||
| // get rid of unnecessary stuff | ||
| $myPolygon = str_replace("MULTIPOLYGON","",$myPolygon); | ||
| $myPolygon = str_replace("(","",$myPolygon); | ||
| $myPolygon = str_replace(")","",$myPolygon); | ||
| $point = str_replace("POINT","",$point); | ||
| $point = str_replace("(","",$point); | ||
| $point = str_replace(")","",$point); | ||
| // make an array of points of the polygon | ||
| $polygon = explode(",",$myPolygon); | ||
| // get the x and y coordinate of the point | ||
| $p = explode(" ",$point); | ||
| $px = $p[0]; | ||
| $py = $p[1]; | ||
| // number of points in the polygon | ||
| $n = count($polygon); | ||
| $poly1 = $polygon[0]; | ||
| for ($i=1; $i <= $n; $i++) { | ||
| $poly1XY = explode(" ",$poly1); | ||
| $poly1x = $poly1XY[0]; | ||
| $poly1y = $poly1XY[1]; | ||
| $poly2 = $polygon[$i % $n]; | ||
| $poly2XY = explode(" ",$poly2); | ||
| $poly2x = $poly2XY[0]; | ||
| $poly2y = $poly2XY[1]; | ||
| if ($py > min($poly1y,$poly2y)) { | ||
| if ($py <= max($poly1y,$poly2y)) { | ||
| if ($px <= max($poly1x,$poly2x)) { | ||
| if ($poly1y != $poly2y) { | ||
| $xinters = ($py-$poly1y)*($poly2x-$poly1x)/($poly2y-$poly1y)+$poly1x; | ||
| if ($poly1x == $poly2x || $px <= $xinters) { | ||
| $counter++; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| $poly1 = $poly2; | ||
| } // end of While each polygon | ||
| if ($counter % 2 == 0) { | ||
| return FALSE; // outside | ||
| } else { | ||
| return TRUE; // inside | ||
| } | ||
| } | ||
|
|
||
| function electoralDistrict($easting, $northing) { | ||
|
|
||
| $result = mysql_query("SELECT *, AsText(ogc_geom) AS myPolygon FROM `county_electoral_division_region` WHERE Contains(`ogc_geom`, GeomFromText('Point($easting $northing)'))"); | ||
|
|
||
| while ($row = mysql_fetch_array($result)) { | ||
| if (myWithin($row['myPolygon'], $easting." ".$northing) === TRUE) { | ||
| $district['uri'] = "http://data.ordnancesurvey.co.uk/doc/7". str_pad($row['UNIT_ID'], 15, "0", STR_PAD_LEFT); | ||
| $district['code'] = "7". str_pad($row['UNIT_ID'], 15, "0", STR_PAD_LEFT);; | ||
| $district['name'] = str_replace(" ED", "", $row['NAME']); | ||
| } | ||
| } | ||
|
|
||
| return $district; | ||
|
|
||
| } | ||
| ?> |
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