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<?php //$Id
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/**
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* @file
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*
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* a geolocation field.
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*
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* @todo: views integration - proximity filter, expose latitude and longitude independently to views.
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* @todo: add mysql spatial extension support and distance mapping.
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*
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* High Performance Proximity Detection Methodology?
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* 1) limit result set using mysql spatial extensions for rough bounding boxes.
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* and limit the result set that we use to compute greater circle...
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* ex) WHERE MBRwithin()
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* 2) Store long in radians
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* 3) precompute sin/cos for lats.
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*
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* table {
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longitude varchar
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latitude varchar
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longrads float
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latsin float
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latcos float
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latlong_pt POINT(longitude, latitude)
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}
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given $max_distance FROM (ptlat, ptlong)
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$radius = 0.5 * $max_distance;
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$poly = ($ptlong + $radius) .' '. ($ptlat + $radius).','. ($ptlong + $radius) .' '. ($ptlat - $radius).','.
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($ptlong - $radius) .' '. ($ptlat - $radius).','. ($ptlong - $radius).' '. ($ptlat + $radius).','.
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($ptlong + $radius).' '. ($ptlat + $radius)
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$ptlatsin = sin(deg2rad($ptlat));
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$ptlatcos = cos(deg2rad($ptlat));
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$ptlongrads = deg2rad($ptlong);
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SELECT nid, delta, acos( ($ptlatsin * latsin) + (ptlatcos*latcos * cos(longrads - ptlongrads) )) as distance
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from geolocation WHERE MRBContains(POLYGON($poly), latlong_pt) AND distance < $max_distance.
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*
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*/
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/**
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* @defgoup geolocation_core_hooks
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* @{
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*
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* Core Drupal hooks for geolocation.
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*/
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function geolocation_help($section) {
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}
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function geolocation_perms() {
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}
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/**
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* @} End "defgoup geolocation_core_hooks"
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*/
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/**
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* @defgoup geolocation_field_hooks
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* @{
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*
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* CCK field hooks for geolocation.
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*/
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function geolocation_field_info() {
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return array(
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'geolocation' => array('label' => 'Geolocation'),
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);
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}
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function geolocation_field_settings($op, $field) {
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switch($op) {
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case 'database columns':
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return array(
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'longitude' => array(
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'type' => 'float',
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'not null' => TRUE,
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'default' => 0,
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),
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'latitude' => array(
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'type' => 'float',
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'not null' => TRUE,
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'default' => 0,
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),
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'longrads' => array(
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'type' => 'float',
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'not null' => TRUE,
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'default' => 0,
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),
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'latsin' => array(
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'type' => 'float',
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'not null' => TRUE,
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'default' => 0,
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),
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'latcos' => array(
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'type' => 'float',
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'not null' => TRUE,
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'default' => 0,
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),
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'source' => array(
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'type' => 'text',
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'default' => '',
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),
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);
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}
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}
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function geolocation_field($op, $node, $field, &$items, $teaser, $page) {
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switch($op) {
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case 'validate':
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foreach($items as $delta => $item) {
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if ( (-90 >= $item['latitude']) && ($item['latitude'] <= 90) ) {
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form_set_error($field['field_name'], t('Latitude is out of Range.'));
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}
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if ( (-180 >= $item['longitude']) && ($item['latitude'] <= 180) ) {
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form_set_error($field['field_name'], t('Latitude is out of Range'));
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}
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}
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break;
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case 'insert':
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case 'update':
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foreach ($items as $delta => $item) {
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// precalculate some goodness.
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$item['latsin'] = sin(deg2rad($item['latitude']));
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$item['latcos'] = cos(deg2rad($item['latitude']));
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$item['longrads'] = deg2rad($item['longitude']);
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$items[$delta] = $item;
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}
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$items = array_values($items); // compact deltas
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}
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}
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/**
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* @}
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*/
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/**
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* @defgoup geolocation_widget_hooks
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* @{
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*
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* Plain widget for geolocation.
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*/
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function geolocation_widget_info() {
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return array(
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'geolocation_textfields' => array(
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'label' => 'Long./Lat. text fields',
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'field types' => array('geolocation'),
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),
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);
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}
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function geolocation_widget_settings() {
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// This widget really has no settings...
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// the google widget will probably require a gmap api key here.
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}
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function geolocation_widget($op, $node, $field, &$items) {
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$fieldname = $field['field_name'];
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switch($op) {
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case 'form':
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$form[$fieldname] = array(
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'#type' => 'fieldset',
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'#title' => $field['widget']['label'],
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'#weight' => $field['widget']['weight'],
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'#collapsible' => TRUE,
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'#collapsed' => FALSE,
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'#tree' => TRUE,
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);
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// if we got items, add em.
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if (count($items)) {
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foreach($items as $delta => $item) {
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$form[$fieldname][$delta] = geolocation_widget_geolocation_textfields_form($item);
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}
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}
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// if we're a multiple field add a few extra elements, if we're a single value add a new form.
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if ($field['multiple'] || count($items) == 0) {
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$form[$fieldname][0] = geolocation_widget_geolocation_textfields_form();
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}
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return $form;
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case 'process form values':
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// Don't save empty values, beyond the first value.
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foreach ($items as $delta => $item) {
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if ($item['value'] == '' && $delta > 0) {
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unset($items[$delta]);
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}
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}
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break;
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}
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}
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function geolocation_widget_geolocation_textfields_form($item = array()) {
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$form = array();
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$form['latitude'] = array(
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'#type' => 'textfield',
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'#title' => t('Latitude'),
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'#default_value' => $item['latitude'],
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'#required' => TRUE,
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);
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$form['longitude'] = array(
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'#type' => 'textfield',
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'#title' => t('Longitude'),
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'#default_value' => $item['longitude'],
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'#required' => TRUE,
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);
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return $form;
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}
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/**
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* @}
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*/
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/**
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* @defgoup geolocation_formatter_hooks
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* @{
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*
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* Plain formatter for geolocation.
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*/
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function geolocation_field_formatter_info() {
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$formatters = array(
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'geolocation_plain' => array(
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'label' => 'Plain',
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'field types' => array('geolocation'),
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),
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);
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return $formatters;
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}
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function geolocation_field_formatter($field, $item, $formatter) {
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switch($formatter) {
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case 'geolocation_plain':
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return theme('geolocation_plain', $item);
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}
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}
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function theme_geolocation_plain($item) {
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$output = '<span class="latitude"><span class="label">'. t('Latitude') .': </span><span class="value">'. check_plain($item['latitude']) .'</span> ';
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$output .= '<span class="longitude"><span class="label">'. t('Longitude').': </span><span class="value">'. check_plain($item['longitude']) .'</span>';
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return '<div class="geolocation">'. $output .'<div>';
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}
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/**
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* @}
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*/
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