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<?php
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// $Id: nicemap.module,v 1.2 2008/11/14 20:23:59 jmiccolis Exp $
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/**
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* Nicemap - A WMS client and map generator for Drupal
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*
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* This module stores a few variables
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*
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* nicemap_map_url The base URL, with no querystring
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* nicemap_c A serialized array of pertinent information gleaned
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* from ?request=GetCapabilities
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*
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*/
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/**
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* Implementation of hook_menu().
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*/
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function nicemap_menu() {
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$items = array();
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$items['admin/settings/nicemap'] = array(
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'title' => 'Nicemap Configuration',
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'description' => 'Test WMS servers with the Nicemap module.',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('nicemap_settings'),
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'access arguments' => array('administer site configuration'),
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'file' => 'nicemap_admin.inc',
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'type' => MENU_NORMAL_ITEM,
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);
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$items['admin/settings/nicemap/settings'] = array(
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'type' => MENU_DEFAULT_LOCAL_TASK,
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'title' => 'Settings',
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'weight' => -1,
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);
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$items['admin/settings/nicemap/cache'] = array(
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'type' => MENU_LOCAL_TASK,
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'title' => 'Clear cache',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('nicemap_cache_clear'),
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'access arguments' => array('administer site configuration'),
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'file' => 'nicemap_admin.inc',
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);
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return $items;
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}
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/**
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* Implementation of hook_theme
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*/
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function nicemap_theme($existing, $type, $theme, $path) {
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return array(
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'nicemap_map' => array(
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'file' => 'nicemap.theme.inc',
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'arguments' => array('points' => array(), 'map' => array(), 'width' => 200, 'height' => 200),
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),
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'nicemap_point' => array(
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'file' => 'nicemap.theme.inc',
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'arguments' => array('point' => array()),
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),
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'nicemap_content' => array(
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'file' => 'nicemap.theme.inc',
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'arguments' => array('point' => array()),
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),
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'nicemap_settings_layers' => array(
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'file' => 'nicemap_admin.inc',
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'arguments' => array('form' => array()),
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),
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);
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}
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/**
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* Implementation of hook_views_api
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*/
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function nicemap_views_api() {
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return array(
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'api' => 2,
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'path' => drupal_get_path('module', 'nicemap') . '/views',
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);
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}
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/**
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* The raw nicemap compatibilities parsing function
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* @param $base_url the base URL of the WMS server
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* @return array on success, exception on error
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*/
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function nicemap_capabilities($base_url) {
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$capabilities = $base_url .'?request=GetCapabilities&service=WMS';
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// Supress errors caused by offline servers
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$cxml = @simplexml_load_file($capabilities);
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if (!$cxml) {
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drupal_set_message('The WMS server could not be reached.');
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return array();
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}
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//if ((float) $cxml['version'] < '1.1.1') {
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// throw new Exception('WMS Server verson must be 1.1.1. The specified server defined '.
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// $cxml['version'] .' instead.');
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//}
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//TODO: This could use more error checking
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foreach ($cxml->Capability->Request->GetMap->Format as $f) {
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$file_types[] = (String) $f;
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}
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// Overall info
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$c['info'] = array(
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'name' => (String) $cxml->Service->Name,
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'title' => (String) $cxml->Service->Title,
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'abstract' => (String) $cxml->Service->Abstract,
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'filetypes' => (String) $file_types);
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if ($layers = $cxml->Capability->Layer->Layer) {
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// Master layer info
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if (isset($cxml->Capability->Layer->CRS)) {
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$c['crs'][] = (String) $cxml->Capability->Layer->CRS;
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}
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// Grab information particular to each layer
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foreach ($layers as $l) {
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$c['layers'][(String) $l->Name] = array(
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'title' => (String) $l->Title,
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'bounds' =>
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array(
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'minx' => (float) $l->LatLonBoundingBox['minx'],
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'miny' => (float) $l->LatLonBoundingBox['miny'],
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'maxx' => (float) $l->LatLonBoundingBox['maxx'],
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'maxy' => (float) $l->LatLonBoundingBox['maxy']),
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);
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if ((String) $l->SRS) {
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$c['layers'][(String) $l->Name]['srs'] = (String) $l->SRS;
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}
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if ($l->Style) {
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foreach ($l->Style as $style) {
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$c['layers'][(String) $l->Name]['styles'][(String) $style->Name] = (String) $style->Title;
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}
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// Sort styles
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ksort($c['layers'][(String) $l->Name]['styles']);
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}
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}
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}
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return $c;
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}
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/**
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* A proxy to the nicemap compatibilities cache
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* @param $base_url the base URL of the WMS server
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* @return array on success, false on error
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*/
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function nicemap_capabilities_cache($base_url = NULL, $reset = false) {
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$base_url = $base_url ? $base_url : variable_get('nicemap_wms_url', '');
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$cache = variable_get('nicemap_cache', array());
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if (!isset($cache[$base_url]) || $reset) {
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$cache[$base_url] = nicemap_capabilities($base_url);
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variable_set('nicemap_cache', $cache);
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}
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return $cache[$base_url];
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}
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/**
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* Helper function to retrieve layers & style information and order by custom weight.
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*/
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function _nicemap_get_layers($spec = NULL) {
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$layers = array();
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if ($spec) {
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if (count($spec['layers'])) {
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$layers = $spec['layers'];
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$weights = variable_get('nicemap_wms_weights', array());
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foreach ($weights as $layer => $weight) {
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if (isset($layers[$layer])) {
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$layers[$layer]['#weight'] = $weight;
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}
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}
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}
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}
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else {
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$styles = variable_get('nicemap_wms_styles', array());
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$weights = variable_get('nicemap_wms_weights', array());
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foreach (variable_get('nicemap_wms_layers', array()) as $layer => $enabled) {
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if ($enabled) {
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$layers[$layer] = array(
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'style' => $styles[$layer],
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'#weight' => isset($weights[$layer]) ? $weights[$layer] : 0,
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);
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}
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}
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}
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uasort($layers, 'element_sort');
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return $layers;
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}
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/**
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* Helper function that provides a new projection object.
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*/
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function nicemap_map_projection($type) {
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switch ($type) {
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case 'equirectangular':
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$projection = new nicemap_equirectangular_projection();
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return $projection;
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case 'mercator':
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$projection = new nicemap_mercator_projection();
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return $projection;
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}
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return false;
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}
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/**
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* Helper function that determines the correct projection.
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*/
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function nicemap_get_projection() {
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$projections = nicemap_projections();
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switch (variable_get('nicemap_mode', '')) {
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case 'wms':
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$p = variable_get('nicemap_wms_crs', false);
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break;
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case 'file':
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$p = variable_get('nicemap_file_projection', false);
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break;
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}
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if ($p && isset($projections[$p])) {
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return new $projections[$p]['class']();
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}
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return false;
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}
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/**
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* Provides an array of projection options -- usable for form selects.
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*/
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function nicemap_projections() {
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return array(
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'EPSG:3395' => array(
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'mercator' => t('Mercator'),
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'class' => 'nicemap_mercator_projection',
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),
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'EPSG:4326' => array(
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'name' => t('Equirectangular'),
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'class' => 'nicemap_equirectangular_projection',
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),
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'EPSG:900913' => array(
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'mercator' => t('Google Mercator'),
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'class' => 'nicemap_mercator_projection', // Don't have a definition yet, so we fall back.
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),
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);
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}
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/**
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* A map object.
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*/
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class nicemap_map {
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public $server;
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public $bgcolor;
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public $layers = array();
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public $styles = array();
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public $bounds = array();
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public $projection;
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function __construct($load_layers = true) {
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$this->bgcolor = variable_get('nicemap_wms_bgcolor', '');
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$this->server = variable_get('nicemap_wms_url', '');
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$this->projection = nicemap_get_projection();
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if ($load_layers) {
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foreach (_nicemap_get_layers() as $layer => $info) {
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$this->layers[] = $layer;
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$this->styles[] = $info['style'];
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}
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}
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}
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/**
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* Expand or contract map as needed given coordinates and the desired pixel size
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*
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* @param $items
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* Array of items to display on the map
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* @param $target
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* Array, target size of map
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*
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* @return
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* Trimmed array of items to display on the map.
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*/
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function process($items, $target = array()) {
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// Preserve original map bounds.
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$orig_map = $this->bounds;
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$this->bounds = $this->projection->getmap($this->bounds, $target);
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$points = array();
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foreach ($items as $item) {
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if (
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$item['lat'] > $orig_map['miny'] &&
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$item['lat'] < $orig_map['maxy'] &&
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$item['lon'] > $orig_map['minx'] &&
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$item['lon'] < $orig_map['maxx']
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) {
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list($x, $y) = $this->projection->getpoint($this->bounds, $item);
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$ratio['y'] = $y / $this->bounds['h'];
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$ratio['x'] = $x / $this->bounds['w'];
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$y = 100 - (100 * $ratio['y']);
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$x = 100 * $ratio['x'];
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$item['x'] = $x;
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$item['y'] = $y;
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$points[] = $item;
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}
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}
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return $points;
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}
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/**
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* Generate a new map URL
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*
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* TODO Allow options to override.
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*/
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function url($options = array()) {
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if ($this->server) {
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if ($this->styles) {
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$options['styles'] = implode(',', $this->styles);
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}
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if ($this->bgcolor) {
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$options['bgcolor'] = '0x'. $this->bgcolor;
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}
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$options['request'] = 'GetMap';
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$options['version'] = '1.1.1';
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$options['format'] = 'image/png';
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$options['layers'] = implode(',', $this->layers);
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// For now, grab SRS from variables
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$options['srs'] = variable_get('nicemap_wms_crs', 'EPSG:900913');
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$options['EXCEPTIONS'] = 'application/vnd.ogc.se_inimage';
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$options['bbox'] = $this->bounds['minx'].','.$this->bounds['miny'].','.$this->bounds['maxx'].','.$this->bounds['maxy'];
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$url = array();
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foreach ($options as $flag => $val) {
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$url[] = $flag ."=". $val;
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}
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$url = implode('&', $url);
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return url($this->server, array('query' => $url, 'fragment' => null, 'absolute' => TRUE));
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}
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else {
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return;
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}
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}
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}
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/**
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* Interface for nicemap map projections.
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*/
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interface nicemap_projection {
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/**
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* Get map takes a boundry array and a target size and generates usable coordinates.
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*
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* @param $map
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* @param $target
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*
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* @return
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* a treated map array
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*/
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public function getmap($map, $target);
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/**
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* Get point plots a point on a map.
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*
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* @param $map
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* @param $item
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*
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* @return
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* a two element array of x, y.
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*/
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public function getpoint($map, $item);
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}
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/**
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* Provides a mercator projection for nicemap.
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*/
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class nicemap_mercator_projection implements nicemap_projection {
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public function getmap($map, $target) {
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// create height in terms of mercator projection
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// and set an origin height coordinate
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$map['w'] = deg2rad($map['maxx']) - deg2rad($map['minx']);
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$map['h'] = asinh(tan(deg2rad($map['maxy']))) - asinh(tan(deg2rad($map['miny'])));
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$map['o'] = asinh(tan(deg2rad($map['miny'])));
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$map['ratio'] = $map['w'] / $map['h'];
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if (count($target)) {
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$target['ratio'] = $target['width'] / $target['height'];
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// target is wider than map
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if ($target['ratio'] >= $map['ratio']) {
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// calculate new width from ratio
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$new_w = $map['h'] * $target['ratio'];
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// Adjust longitudes
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// We resize the map sides in radians
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$map['minx'] = deg2rad($map['minx']) - ($new_w - $map['w']) * .5;
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$map['maxx'] = deg2rad($map['maxx']) + ($new_w - $map['w']) * .5;
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// Check to see whether the boundaries are past +-180deg bounds (pi radians)
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// If they are, pull it in to 180deg and compensate the difference on the other bound.
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// If both bounds are over the limit, we set to -180 to 180 -- at least the map will not totally break...
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if (($map['minx'] < (M_PI * -1)) && ($map['maxx'] > M_PI)) {
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$map['minx'] = M_PI * -1;
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$map['maxx'] = M_PI;
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}
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else if ($map['minx'] < (M_PI * -1)) {
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$diff = $map['minx'] - (M_PI * -1);
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$map['minx'] = $map['minx'] - $diff;
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$map['maxx'] = $map['maxx'] - $diff;
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}
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else if ($map['maxx'] > M_PI) {
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$diff = ($map['maxx'] - M_PI);
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$map['maxx'] = $map['maxx'] - $diff;
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$map['minx'] = $map['minx'] - $diff;
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}
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// Convert bounds to degrees
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$map['miny'] = rad2deg($map['miny']);
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$map['maxy'] = rad2deg($map['maxy']);
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// overwrite width + ratio
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$map['w'] = $new_w;
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$map['ratio'] = $target['ratio'];
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}
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// target is taller than map
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else {
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// 1. we know the map is wide enough
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// 2. we need to find the necessary radian height to match ratios
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// 3. once we have the radian height, we need to adjust the bounding latitudes
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// @TODO: make sure that we don't adjust past the poles...
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// subtract half the height from top to find midpoint
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$midpoint = asinh(tan(deg2rad($map['maxy']))) - ($map['h']*.5);
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// set map height to match target height
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$map['h'] = $map['w'] / $target['ratio']; // 2
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// find origin in radians
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$map['o'] = $midpoint - ($map['h']*.5);
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// find new latitude bounds by converting radian bounds to mercator degrees
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$map['maxy'] = rad2deg(atan(sinh($midpoint + ($map['h']*.5))));
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$map['miny'] = rad2deg(atan(sinh($midpoint - ($map['h']*.5))));
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}
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}
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$map['ratio'] = $map['w'] / $map['h'];
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return $map;
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}
|
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public function getpoint($map, $item) {
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| 449 |
$y = asinh(tan(deg2rad($item['lat']))) - $map['o'];
|
| 450 |
$x = deg2rad($item['lon']) - deg2rad($map['minx']);
|
| 451 |
|
| 452 |
return array($x, $y);
|
| 453 |
}
|
| 454 |
}
|
| 455 |
|
| 456 |
/**
|
| 457 |
* Provides a equirectangular projection for nicemap.
|
| 458 |
*
|
| 459 |
* Simply convert all degrees into radians and press "ALL SYSTEMS GO"
|
| 460 |
*
|
| 461 |
* TODO test!
|
| 462 |
*/
|
| 463 |
class nicemap_equirectangular_projection implements nicemap_projection {
|
| 464 |
|
| 465 |
public function getmap($map, $target) {
|
| 466 |
$map['w'] = deg2rad($map['maxx']) - deg2rad($map['minx']);
|
| 467 |
$map['h'] = deg2rad($map['maxy']) - deg2rad($map['miny']);
|
| 468 |
|
| 469 |
$map['o'] = deg2rad($map['miny']);
|
| 470 |
$map['ratio'] = $map['w'] / $map['h'];
|
| 471 |
|
| 472 |
if (count($target)) {
|
| 473 |
$target['ratio'] = $target['width'] / $target['height'];
|
| 474 |
// target is wider than map
|
| 475 |
if ($target['ratio'] >= $map['ratio']) {
|
| 476 |
|
| 477 |
// calculate new width from ratio
|
| 478 |
$new_w = $map['h'] * $target['ratio'];
|
| 479 |
|
| 480 |
// adjust longitudes
|
| 481 |
$map['minx'] = $map['minx'] - rad2deg(($new_w - $map['w']) * .5);
|
| 482 |
$map['maxx'] = $map['maxx'] + rad2deg(($new_w - $map['w']) * .5);
|
| 483 |
$map['minx'] = ($map['minx'] < -180) ? $map['minx'] = -179.99 : $map['minx'];
|
| 484 |
$map['maxx'] = ($map['maxx'] > 180) ? $map['maxx'] = 179.99 : $map['maxx'];
|
| 485 |
|
| 486 |
// overwrite width + ratio
|
| 487 |
$map['w'] = $new_w;
|
| 488 |
$map['ratio'] = $target['ratio'];
|
| 489 |
}
|
| 490 |
// target is taller than map
|
| 491 |
else {
|
| 492 |
// 1. we know the map is wide enough
|
| 493 |
// 2. we need to find the necessary radian height to match ratios
|
| 494 |
// 3. once we have the radian height, we need to adjust the bounding latitudes
|
| 495 |
|
| 496 |
// subtract half the height from top to find midpoint
|
| 497 |
$midpoint = $map['maxy'] - (rad2deg($map['h'])*.5);
|
| 498 |
|
| 499 |
// set map height to match target height
|
| 500 |
$map['h'] = $map['w'] / $target['ratio']; // 2
|
| 501 |
|
| 502 |
// find origin in radians
|
| 503 |
$map['o'] = deg2rad($midpoint) - ($map['h']*.5);
|
| 504 |
|
| 505 |
// find new latitude bounds by converting radian bounds to mercator degrees
|
| 506 |
$map['maxy'] = $midpoint + rad2deg($map['h']*.5);
|
| 507 |
$map['miny'] = $midpoint - rad2deg($map['h']*.5);
|
| 508 |
}
|
| 509 |
}
|
| 510 |
$map['ratio'] = $map['w'] / $map['h'];
|
| 511 |
return $map;
|
| 512 |
}
|
| 513 |
|
| 514 |
public function getpoint($map, $item) {
|
| 515 |
$x = deg2rad($item['lon']) - deg2rad($map['minx']);
|
| 516 |
$y = deg2rad($item['lat']) - $map['o'];
|
| 517 |
|
| 518 |
return array($x, $y);
|
| 519 |
}
|
| 520 |
}
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