43 lines
1.8 KiB
Swift
43 lines
1.8 KiB
Swift
//
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// Copyright (c) 2022 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import MapKit
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// https://stackoverflow.com/a/15020534
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public extension MKMapView {
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var zoomLevel: Float {
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Float(log2(360 * ((frame.size.width / .expectedMapViewTileSize) / region.span.longitudeDelta))) + 1
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}
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func set(zoomLevel: Float, at centerCoordinate: CLLocationCoordinate2D, animated: Bool = true) {
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let span = MKCoordinateSpan(latitudeDelta: 0,
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longitudeDelta: 360 / pow(2, Double(zoomLevel)) * frame.size.width / .expectedMapViewTileSize)
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setRegion(MKCoordinateRegion(center: centerCoordinate, span: span), animated: animated)
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}
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}
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private extension CGFloat {
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static var expectedMapViewTileSize: CGFloat {
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256
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}
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}
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