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28 lines
1 KiB
Swift
28 lines
1 KiB
Swift
// Copyright © 2021 Metabolist. All rights reserved.
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import Mastodon
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import UIKit
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extension UIView {
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private static let defaultContentsRectSize = CGSize(width: 1, height: 1)
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func setContentsRect(focus: Attachment.Meta.Focus, mediaSize: CGSize) {
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let aspectRatio = mediaSize.width / mediaSize.height
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let viewAspectRatio = bounds.width / bounds.height
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var origin = CGPoint.zero
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if viewAspectRatio > aspectRatio {
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let mediaProportionalHeight = mediaSize.height * bounds.width / mediaSize.width
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let maxPan = (mediaProportionalHeight - bounds.height) / (2 * mediaProportionalHeight)
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origin.y = CGFloat(-focus.y) * maxPan
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} else {
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let mediaProportionalWidth = mediaSize.width * bounds.height / mediaSize.height
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let maxPan = (mediaProportionalWidth - bounds.width) / (2 * mediaProportionalWidth)
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origin.x = CGFloat(focus.x) * maxPan
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}
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layer.contentsRect = CGRect(origin: origin, size: Self.defaultContentsRectSize)
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}
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}
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