Dactyloidae iOS initial commit

mobile/ios/Client/Extensions/GeometryExtensions.swift

@@ -0,0 +1,42 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import UIKit
+
+extension CGRect {
+    var center: CGPoint {
+        get {
+            return CGPoint(x: size.width / 2, y: size.height / 2)
+        }
+        set {
+            self.origin = CGPoint(x: newValue.x - size.width / 2, y: newValue.y - size.height / 2)
+        }
+    }
+}
+
+extension UIEdgeInsets {
+    init(equalInset inset: CGFloat) {
+        top = inset
+        left = inset
+        right = inset
+        bottom = inset
+    }
+}
+
+/**
+Generates the affine transform for transforming the first CGRect into the second one
+
+- parameter frame:   CGRect to transform from
+- parameter toFrame: CGRect to transform to
+
+- returns: CGAffineTransform that transforms the first CGRect into the second
+*/
+func CGAffineTransformMakeRectToRect(_ frame: CGRect, toFrame: CGRect) -> CGAffineTransform {
+    let scale = toFrame.size.width / frame.size.width
+    let tx = toFrame.origin.x + toFrame.width / 2 - (frame.origin.x + frame.width / 2)
+    let ty = toFrame.origin.y - frame.origin.y * scale * 2
+    let translation = CGAffineTransform(translationX: tx, y: ty)
+    let scaledAndTranslated = translation.scaledBy(x: scale, y: scale)
+    return scaledAndTranslated
+}