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<?php |
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namespace Smindel\GIS\Service; |
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use SilverStripe\Core\Injector\Injector; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Injector\Injectable; |
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use Smindel\GIS\GIS; |
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use Smindel\GIS\Control\WebMapTileService; |
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class Tile |
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{ |
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use Configurable; |
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use Injectable; |
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/** |
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* Zoom |
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* |
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* @var int |
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*/ |
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protected $z; |
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/** |
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* x'th tile from left |
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* |
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* @var int |
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*/ |
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protected $x; |
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/** |
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* y'th tile from the top |
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* |
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* @var int |
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*/ |
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protected $y; |
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/** |
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* Default tile width in pixel |
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* |
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* @var int |
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*/ |
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protected $size; |
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/** |
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* Wrap around dateline |
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* |
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* @var int |
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*/ |
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protected $wrap; |
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/** |
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* Top left corner of the tile |
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* |
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* @var array |
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*/ |
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protected $topLeft; |
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protected $longSpan; |
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protected $resource; |
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public function __construct($z, $x, $y, $defaultStyle = [], $wrap = null, $size = null) |
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{ |
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$this->z = $z; |
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$this->x = $x; |
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$this->y = $y; |
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$this->wrap = $wrap !== null ? $wrap : self::config()->get('wrap_date'); |
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$this->size = $size ?: WebMapTileService::config()->get('tile_size'); |
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list($lon, $lat) = Tile::zxy2lonlat($z, $x, $y); |
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$this->longSpan = [$lon, Tile::zxy2lonlat($z, $x + 1, $y)[0]]; |
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$this->topLeft = [ |
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(($lon + 180) / 360) * $this->size * pow(2, $this->z), |
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(0.5 - log((1 + sin($lat * pi() / 180)) / (1 - sin($lat * pi() / 180))) / (4 * pi())) * $this->size * pow(2, $this->z), |
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]; |
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$this->resource = Injector::inst()->get('TileRenderer', false, [$this->size, $this->size, $defaultStyle]); |
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} |
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public function debug($text = null) |
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{ |
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$this->resource->debug($text ?: "$this->z, $this->x, $this->y"); |
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} |
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public function getZXY() |
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{ |
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return [$this->z, $this->x, $this->y]; |
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} |
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public function getContentType() |
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{ |
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return 'image/png'; |
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} |
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public function getLibName() |
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{ |
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return get_class($this->resource)::LIB_NAME; |
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} |
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public function getResource() |
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{ |
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return $this->resource; |
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} |
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public function getRelativePixelCoordinates($wkt, &$reflection = null) |
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{ |
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$geo = GIS::create($wkt)->reproject(4326); |
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{ // determin rendering offset |
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$min = $max = null; |
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GIS::each( |
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$geo, |
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function($lonlat) use (&$min, &$max) { |
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$min = is_null($min) ? $lonlat[0] : min($min, $lonlat[0]); |
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$max = is_null($max) ? $lonlat[0] : max($max, $lonlat[0]); |
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} |
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); |
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$distance = [-360 => null, 0 => null, 360 => null]; |
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foreach ($distance as $offset => &$dist) { |
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$dist = min($max, $this->longSpan[1] + $offset) - max($min, $this->longSpan[0] + $offset); |
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} |
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} |
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foreach ($distance as $offset => &$dist) { |
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$dist = GIS::each( |
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$geo, |
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function($lonlat) use ($offset) { |
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return [ |
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(($lonlat[0] + 180 - $offset) / 360) * $this->size * pow(2, $this->z) - $this->topLeft[0], |
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(0.5 - log((1 + sin($lonlat[1] * pi() / 180)) / (1 - sin($lonlat[1] * pi() / 180))) / (4 * pi())) * $this->size * pow(2, $this->z) - $this->topLeft[1], |
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]; |
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} |
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); |
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} |
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$largest = &$distance[0]; |
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$reflection = array_filter($distance); |
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return $largest; |
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} |
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public function render($list) |
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{ |
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foreach ($list as $item) { |
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if ($item->hasMethod('renderOnWebMapTile')) { |
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$item->renderOnWebMapTile($this); |
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} else { |
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$property = GIS::of(get_class($item)); |
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$primary = $this->getRelativePixelCoordinates($item->$property, $reflections); |
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if ($this->wrap) { |
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foreach ($reflections as $reflection) { |
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$this->resource->{'draw' . GIS::create($item->$property)->type}($reflection); |
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} |
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} else { |
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$this->resource->{'draw' . GIS::create($item->$property)->type}($primary); |
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} |
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} |
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} |
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return $this->resource->getImageBlob(); |
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} |
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public static function zxy2lonlat($z, $x, $y) |
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{ |
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$n = pow(2, $z); |
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$lon_deg = $x / $n * 360.0 - 180.0; |
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$lat_deg = rad2deg(atan(sinh(pi() * (1 - 2 * $y / $n)))); |
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return [$lon_deg, $lat_deg]; |
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} |
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} |
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This check looks for function or method calls that always return null and whose return value is assigned to a variable.
The method
getObject()
can return nothing but null, so it makes no sense to assign that value to a variable.The reason is most likely that a function or method is imcomplete or has been reduced for debug purposes.