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implement caching tiles with kingfisher
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,233 @@ | ||
| // | ||
| // DataSourceTileProvider.swift | ||
| // Marlin | ||
| // | ||
| // Created by Daniel Barela on 12/19/22. | ||
| // | ||
|
|
||
| import Foundation | ||
| import Kingfisher | ||
| import CoreData | ||
| import MapKit | ||
| import sf_proj_ios | ||
| import sf_ios | ||
|
|
||
| enum DataTileError: Error { | ||
| case zeroObjects | ||
| case notFound | ||
| case unexpected(code: Int) | ||
| } | ||
|
|
||
| extension DataTileError: CustomStringConvertible { | ||
| public var description: String { | ||
| switch self { | ||
| case .zeroObjects: | ||
| return "There were no objects for this image." | ||
| case .notFound: | ||
| return "The specified item could not be found." | ||
| case .unexpected(_): | ||
| return "An unexpected error occurred." | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension DataTileError: LocalizedError { | ||
| public var errorDescription: String? { | ||
| switch self { | ||
| case .zeroObjects: | ||
| return NSLocalizedString( | ||
| "There were no objects for this image.", | ||
| comment: "Zero Objects" | ||
| ) | ||
| case .notFound: | ||
| return NSLocalizedString( | ||
| "The specified item could not be found.", | ||
| comment: "Resource Not Found" | ||
| ) | ||
| case .unexpected(_): | ||
| return NSLocalizedString( | ||
| "An unexpected error occurred.", | ||
| comment: "Unexpected Error" | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| struct DataSourceTileProvider<T : MapImage>: ImageDataProvider { | ||
| var cacheKey: String { | ||
| var key = "\(T.self.key)/\(path.z)/\(path.x)/\(path.y)" | ||
| if let predicate = predicate { | ||
| key = "\(key)/\(predicate.debugDescription)" | ||
| } | ||
| return key | ||
| } | ||
| let predicate: NSPredicate? | ||
| let sortDescriptors: [NSSortDescriptor]? | ||
| let path: MKTileOverlayPath | ||
| let tileSize: CGSize | ||
| let objects: [T]? | ||
|
|
||
| init(path: MKTileOverlayPath, predicate: NSPredicate?, sortDescriptors: [NSSortDescriptor]?, objects: [T]? = nil, tileSize: CGSize) { | ||
| self.path = path | ||
| self.predicate = predicate | ||
| self.sortDescriptors = sortDescriptors | ||
| self.tileSize = tileSize | ||
| self.objects = objects | ||
| } | ||
|
|
||
| func data(handler: @escaping (Result<Data, Error>) -> Void) { | ||
| DispatchQueue.global(qos: .userInitiated).async { | ||
| let zoomLevel = path.z | ||
|
|
||
| let minTileLon = longitude(x: path.x, zoom: path.z) | ||
| let maxTileLon = longitude(x: path.x+1, zoom: path.z) | ||
| let minTileLat = latitude(y: path.y+1, zoom: path.z) | ||
| let maxTileLat = latitude(y: path.y, zoom: path.z) | ||
|
|
||
| guard let neCorner3857 = SFGeometryUtils.degreesToMetersWith(x: maxTileLon, andY: maxTileLat), | ||
| let swCorner3857 = SFGeometryUtils.degreesToMetersWith(x: minTileLon, andY: minTileLat) else { | ||
| return | ||
| } | ||
|
|
||
| let minTileX = swCorner3857.x.doubleValue | ||
| let minTileY = swCorner3857.y.doubleValue | ||
| let maxTileX = neCorner3857.x.doubleValue | ||
| let maxTileY = neCorner3857.y.doubleValue | ||
|
|
||
| // border the tile by 40 miles since that is as far as any light i have seen. if that is wrong, update | ||
| // border has to be at least 30 pixels as well | ||
| let nauticalMilesMeasurement = NSMeasurement(doubleValue: 40.0, unit: UnitLength.nauticalMiles) | ||
| let metersMeasurement = nauticalMilesMeasurement.converting(to: UnitLength.meters).value | ||
|
|
||
| let tolerance = max(metersMeasurement, ((maxTileY - minTileY) / self.tileSize.width) * 30.0) | ||
|
|
||
| guard let neCornerTolerance = SFGeometryUtils.metersToDegreesWith(x: maxTileX + tolerance, andY: maxTileY + tolerance), | ||
| let swCornerTolerance = SFGeometryUtils.metersToDegreesWith(x: minTileX - tolerance, andY:minTileY - tolerance) else { | ||
| return | ||
| } | ||
|
|
||
| drawTile(tileBounds3857: MapBoundingBox(swCorner: (x: swCorner3857.x.doubleValue, y: swCorner3857.y.doubleValue), neCorner: (x: neCorner3857.x.doubleValue, y: neCorner3857.y.doubleValue)), queryBounds: MapBoundingBox(swCorner: (x: swCornerTolerance.x.doubleValue, y: swCornerTolerance.y.doubleValue), neCorner: (x: neCornerTolerance.x.doubleValue, y: neCornerTolerance.y.doubleValue)), zoomLevel: zoomLevel, cacheKey: cacheKey, handler: handler) | ||
| } | ||
| } | ||
|
|
||
| func drawTile(tileBounds3857: MapBoundingBox, queryBounds: MapBoundingBox, zoomLevel: Int, cacheKey: String, handler: @escaping (Result<Data, Error>) -> Void) { | ||
|
|
||
| var boundsPredicate: NSPredicate? | ||
|
|
||
| if queryBounds.swCorner.x < -180 { | ||
| boundsPredicate = NSCompoundPredicate(orPredicateWithSubpredicates: [ | ||
| NSPredicate(format: "latitude >= %lf AND latitude <= %lf AND longitude >= %lf AND longitude <= %lf", queryBounds.swCorner.y, queryBounds.neCorner.y, -180.0, queryBounds.neCorner.x), | ||
| NSPredicate(format: "latitude >= %lf AND latitude <= %lf AND longitude >= %lf AND longitude <= %lf", queryBounds.swCorner.y, queryBounds.neCorner.y, queryBounds.swCorner.x + 360.0, 180.0) | ||
| ]) | ||
| } else if queryBounds.neCorner.x > 180 { | ||
| boundsPredicate = NSCompoundPredicate(orPredicateWithSubpredicates: [ | ||
| NSPredicate(format: "latitude >= %lf AND latitude <= %lf AND longitude >= %lf AND longitude <= %lf", queryBounds.swCorner.y, queryBounds.neCorner.y, queryBounds.swCorner.x, 180.0), | ||
| NSPredicate(format: "latitude >= %lf AND latitude <= %lf AND longitude >= %lf AND longitude <= %lf", queryBounds.swCorner.y, queryBounds.neCorner.y, -180.0, queryBounds.neCorner.x - 360.0) | ||
| ]) | ||
| } else { | ||
| boundsPredicate = NSPredicate( | ||
| format: "latitude >= %lf AND latitude <= %lf AND longitude >= %lf AND longitude <= %lf", queryBounds.swCorner.y, queryBounds.neCorner.y, queryBounds.swCorner.x, queryBounds.neCorner.x | ||
| ) | ||
| } | ||
|
|
||
| guard let boundsPredicate = boundsPredicate else { | ||
| return | ||
| } | ||
|
|
||
| var finalPredicate: NSPredicate = boundsPredicate | ||
|
|
||
| if let predicate = predicate { | ||
| finalPredicate = NSCompoundPredicate(andPredicateWithSubpredicates: [predicate, boundsPredicate]) | ||
| } | ||
|
|
||
| let objects = getMatchingObjects(predicate: finalPredicate) | ||
| if objects == nil || objects?.count == 0 { | ||
| handler(.failure(DataTileError.zeroObjects)) | ||
| return | ||
| } | ||
|
|
||
| UIGraphicsBeginImageContext(self.tileSize) | ||
|
|
||
| if let objects = objects { | ||
| for object in objects { | ||
| let mapImages = object.mapImage(marker: false, zoomLevel: zoomLevel, tileBounds3857: tileBounds3857, context: UIGraphicsGetCurrentContext()) | ||
| for mapImage in mapImages { | ||
| let object3857Location = coord4326To3857(longitude: object.longitude, latitude: object.latitude) | ||
| let xPosition = (((object3857Location.x - tileBounds3857.swCorner.x) / (tileBounds3857.neCorner.x - tileBounds3857.swCorner.x)) * self.tileSize.width) | ||
| let yPosition = self.tileSize.height - (((object3857Location.y - tileBounds3857.swCorner.y) / (tileBounds3857.neCorner.y - tileBounds3857.swCorner.y)) * self.tileSize.height) | ||
| mapImage.draw(in: CGRect(x: (xPosition - (mapImage.size.width / 2)), y: (yPosition - (mapImage.size.height / 2)), width: mapImage.size.width, height: mapImage.size.height)) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()! | ||
|
|
||
| UIGraphicsEndImageContext() | ||
| guard let cgImage = newImage.cgImage else { | ||
| handler(.failure(DataTileError.notFound)) | ||
| return | ||
| } | ||
| let data = UIImage(cgImage: cgImage).pngData() | ||
| if let data = data { | ||
| handler(.success(data)) | ||
| } else { | ||
| handler(.failure(DataTileError.notFound)) | ||
| } | ||
|
|
||
| } | ||
|
|
||
| func getMatchingObjects(predicate: NSPredicate) -> [T]? { | ||
| if let objects = objects { | ||
|
|
||
| let filteredObjects: [T] = objects.filter { object in | ||
| return predicate.evaluate(with: object) | ||
| } | ||
|
|
||
| return filteredObjects | ||
| } | ||
|
|
||
| if let M = T.self as? NSManagedObject.Type { | ||
|
|
||
| let tileFetchRequest = M.fetchRequest() | ||
| tileFetchRequest.sortDescriptors = sortDescriptors | ||
|
|
||
| tileFetchRequest.predicate = predicate | ||
|
|
||
| let context = PersistenceController.current.newTaskContext() | ||
| let objects = try? context.fetch(tileFetchRequest) | ||
| return objects as? [T] | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func coord4326To3857(longitude: Double, latitude: Double) -> (x: Double, y: Double) { | ||
| let a = 6378137.0 | ||
| let lambda = longitude / 180 * Double.pi; | ||
| let phi = latitude / 180 * Double.pi; | ||
| let x = a * lambda; | ||
| let y = a * log(tan(Double.pi / 4 + phi / 2)); | ||
|
|
||
| return (x:x, y:y); | ||
| } | ||
|
|
||
| func coord3857To4326(y: Double, x: Double) -> (lat: Double, lon: Double) { | ||
| let a = 6378137.0 | ||
| let d = -y / a | ||
| let phi = Double.pi / 2 - 2 * atan(exp(d)) | ||
| let lambda = x / a | ||
| let lat = phi / Double.pi * 180 | ||
| let lon = lambda / Double.pi * 180 | ||
|
|
||
| return (lat: lat, lon: lon) | ||
| } | ||
|
|
||
| func longitude(x: Int, zoom: Int) -> Double { | ||
| return Double(x) / pow(2.0, Double(zoom)) * 360.0 - 180.0 | ||
| } | ||
|
|
||
| func latitude(y: Int, zoom: Int) -> Double { | ||
| let n = Double.pi - 2.0 * Double.pi * Double(y) / pow(2.0, Double(zoom)) | ||
| return 180.0 / Double.pi * atan(0.5 * (exp(n) - exp(-n))) | ||
| } | ||
| } |
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