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42 lines
1.3 KiB
Swift
42 lines
1.3 KiB
Swift
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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import UIKit
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extension CGRect {
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var center: CGPoint {
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get {
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return CGPoint(x: size.width / 2, y: size.height / 2)
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}
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set {
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self.origin = CGPoint(x: newValue.x - size.width / 2, y: newValue.y - size.height / 2)
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}
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}
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}
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extension UIEdgeInsets {
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init(equalInset inset: CGFloat) {
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top = inset
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left = inset
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right = inset
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bottom = inset
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}
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}
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/**
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Generates the affine transform for transforming the first CGRect into the second one
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- parameter frame: CGRect to transform from
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- parameter toFrame: CGRect to transform to
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- returns: CGAffineTransform that transforms the first CGRect into the second
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*/
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func CGAffineTransformMakeRectToRect(_ frame: CGRect, toFrame: CGRect) -> CGAffineTransform {
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let scale = toFrame.size.width / frame.size.width
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let tx = toFrame.origin.x + toFrame.width / 2 - (frame.origin.x + frame.width / 2)
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let ty = toFrame.origin.y - frame.origin.y * scale * 2
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let translation = CGAffineTransform(translationX: tx, y: ty)
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let scaledAndTranslated = translation.scaledBy(x: scale, y: scale)
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return scaledAndTranslated
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}
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