You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.3 KiB
61 lines
1.3 KiB
<?php
|
|
namespace p3k\geo\WebMercator;
|
|
|
|
define('TILE_SIZE', 256);
|
|
|
|
function totalPixelsForZoomLevel($zoom) {
|
|
return pow(2, $zoom) * TILE_SIZE;
|
|
}
|
|
|
|
function lngToX($longitude, $zoom) {
|
|
return round((($longitude + 180) / 360) * totalPixelsForZoomLevel($zoom));
|
|
}
|
|
|
|
function latToY($latitude, $zoom) {
|
|
return round(((atanh(sin(deg2rad(-$latitude))) / pi()) + 1) * totalPixelsForZoomLevel($zoom - 1));
|
|
}
|
|
|
|
function latLngToPixels($latitude, $longitude, $zoom) {
|
|
return array(
|
|
'x' => lngToX($longitude, $zoom),
|
|
'y' => latToY($latitude, $zoom)
|
|
);
|
|
}
|
|
|
|
function xToLng($x, $zoom) {
|
|
return (($x * 360) / totalPixelsForZoomLevel($zoom)) - 180;
|
|
}
|
|
|
|
function yToLat($y, $zoom) {
|
|
$a = pi() * (($y / totalPixelsForZoomLevel($zoom - 1)) - 1);
|
|
return -1 * (rad2deg(asin(tanh($a))));
|
|
}
|
|
|
|
function pixelsToLatLng($x, $y, $zoom) {
|
|
return array(
|
|
'lat' => yToLat($y, $zoom),
|
|
'lng' => xToLng($x, $zoom)
|
|
);
|
|
}
|
|
|
|
function tileToPixels($x, $y) {
|
|
return array(
|
|
'x' => $x * TILE_SIZE,
|
|
'y' => $y * TILE_SIZE
|
|
);
|
|
}
|
|
|
|
function pixelsToTile($x, $y) {
|
|
return array(
|
|
'x' => floor($x / TILE_SIZE),
|
|
'y' => floor($y / TILE_SIZE)
|
|
);
|
|
}
|
|
|
|
function positionInTile($x, $y) {
|
|
$tile = pixelsToTile($x, $y);
|
|
return array(
|
|
'x' => round(TILE_SIZE * (($x / TILE_SIZE) - $tile['x'])),
|
|
'y' => round(TILE_SIZE * (($y / TILE_SIZE) - $tile['y']))
|
|
);
|
|
}
|