//
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// CGRectExtensions.swift
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// SwifterSwift
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//
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// Created by Chen Qizhi on 2020/03/11.
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// Copyright © 2020 SwifterSwift
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//
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#if canImport(CoreGraphics)
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import CoreGraphics
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// MARK: - Properties
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public extension CGRect {
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/// SwifterSwift: Return center of rect
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var center: CGPoint { CGPoint(x: midX, y: midY) }
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}
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// MARK: - Initializers
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public extension CGRect {
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/// SwifterSwift: Create a `CGRect` instance with center and size
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/// - Parameters:
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/// - center: center of the new rect
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/// - size: size of the new rect
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init(center: CGPoint, size: CGSize) {
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let origin = CGPoint(x: center.x - size.width / 2.0, y: center.y - size.height / 2.0)
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self.init(origin: origin, size: size)
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}
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}
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// MARK: - Methods
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public extension CGRect {
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/// SwifterSwift: Create a new `CGRect` by resizing with specified anchor
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/// - Parameters:
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/// - size: new size to be applied
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/// - anchor: specified anchor, a point in normalized coordinates -
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/// '(0, 0)' is the top left corner of rect，'(1, 1)' is the bottom right corner of rect,
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/// defaults to '(0.5, 0.5)'. excample:
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///
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/// anchor = CGPoint(x: 0.0, y: 1.0):
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///
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/// A2------B2
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/// A----B | |
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/// | | --> | |
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/// C----D C-------D2
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///
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func resizing(to size: CGSize, anchor: CGPoint = CGPoint(x: 0.5, y: 0.5)) -> CGRect {
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let sizeDelta = CGSize(width: size.width - width, height: size.height - height)
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return CGRect(origin: CGPoint(x: minX - sizeDelta.width * anchor.x,
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y: minY - sizeDelta.height * anchor.y),
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size: size)
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}
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}
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#endif
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