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leaflet_polygon_parsing()

Description

Parses the resource polygon string to extract latitude and longitude bounds and formats the polygon string.

as well as the formatted polygon string for Leaflet display.

Parameters

ColumnTypeDefaultDescription
$fields array The resource fields array containing polygon data.
$minmax bool true Flag to determine if minimum and maximum latitude and longitude values should be calculated.

Return

array An associative array containing the minimum and maximum latitude and longitude values,

Location

include/map_functions.php lines 499 to 528

Definition

 
function leaflet_polygon_parsing($fields, $minmax = true)
    {
    global $map_polygon_field;

    // Search resource $fields array for the $map_polygon_field.
    $key1 = array_search($map_polygon_field, array_column($fields, 'ref'));

    if ($minmax)
        {
        // Strip coordinate pair parathenses from polygon array.
        $values = str_replace(')', '', str_replace('(', '', explode(',', $fields[$key1]['value'])));

        // Determine minimum and maximum latitude values.
        $lat_values = array($values[0], $values[2], $values[4], $values[6]);
        $polygon['lat_min'] = min($lat_values);
        $polygon['lat_max'] = max($lat_values);

        // Determine minimum and maximum longitude values.
        $long_values = array($values[1], $values[3], $values[5], $values[7]);
        $polygon['long_min'] = min($long_values);
        $polygon['long_max'] = max($long_values);
        }

    // Format polygon string for Leaflet footprint display below.
    $polygon1 = str_replace('(', '[', $fields[$key1]['value']);
    $polygon1 = str_replace(')', ']', $polygon1);
    $polygon['values'] = '[' . $polygon1 . ']';

    return $polygon;
    }

This article was last updated 4th December 2024 08:35 Europe/London time based on the source file dated 22nd November 2024 15:35 Europe/London time.