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<?php |
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namespace LaraGeoData\Models; |
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use Illuminate\Database\Eloquent\Builder; |
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use Illuminate\Support\Facades\DB; |
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use LaraGeoData\Contracts\ModelWithCoordinates; |
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trait HasCoordinates |
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{ |
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/** |
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* Table column name for latitude. |
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* |
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* @return string |
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*/ |
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public function latitudeColName(): string |
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{ |
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return $this->latitudeColumnName ?? 'lat'; |
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} |
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/** |
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* Table column name for longitude. |
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* |
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* @return string |
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*/ |
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public function longitudeColName(): string |
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{ |
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return $this->longitudeColumnName ?? 'lng'; |
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} |
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/** |
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* Filed name for distance. This field will be created only id use "nearest" scope. |
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* |
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* @return string |
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*/ |
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public function distanceColName(): string |
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{ |
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return $this->distanceColumnName ?? 'distance'; |
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} |
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/** |
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* Haversine formula (from Google solution example). |
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* By default use radius in kilometers. |
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* |
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* @param Builder $query |
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* @param float $lat |
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* @param float $lng |
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* @param float $radius |
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* @param int $coef |
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* @return Builder |
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*/ |
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public function scopeNearest(Builder $query, float $lat, float $lng, float $radius, int $coef = ModelWithCoordinates::HAVERSINE_COEF_KILOMETERS) |
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{ |
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$latColName = $this->latitudeColName(); |
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$lngColName = $this->longitudeColName(); |
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$distanceFieldName = $this->distanceColName(); |
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return $query->select([ |
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'*', |
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DB::raw(" |
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( {$coef} * |
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acos(cos(radians({$lat})) * |
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cos(radians({$latColName})) * |
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cos(radians({$lngColName}) - |
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radians({$lng})) + |
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sin(radians({$lat})) * |
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sin(radians({$latColName}))) |
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) AS {$distanceFieldName} "), |
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])->having($distanceFieldName, '<=', $radius); |
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} |
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public function scopeNearestInKilometers(Builder $query, float $lat, float $lng, float $radius) |
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{ |
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return $this->scopeNearest($query, $lat, $lng, $radius, ModelWithCoordinates::HAVERSINE_COEF_KILOMETERS); |
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} |
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public function scopeNearestInMiles(Builder $query, float $lat, float $lng, float $radius) |
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{ |
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return $this->scopeNearest($query, $lat, $lng, $radius, ModelWithCoordinates::HAVERSINE_COEF_MILES); |
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} |
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/** |
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* Order query results by distance. |
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* |
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* @param Builder $query |
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* @param string $direction |
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* @return Builder |
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*/ |
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public function scopeOrderByNearest(Builder $query, string $direction = 'asc') |
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{ |
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return $query->orderBy($this->distanceColName(), $direction); |
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} |
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/** |
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* Field has value only is use "nearest" scope. |
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* |
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* @return float |
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*/ |
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public function getDistanceAttribute(): float |
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{ |
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if (array_key_exists($this->distanceColName(), $this->attributes)) { |
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return (float) $this->attributes[$this->distanceColName()]; |
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} |
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return 0; |
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} |
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} |
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yaroslawww /
laravel-geonames
