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110 lines
4.5 KiB
110 lines
4.5 KiB
//
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// SizeExtensions.swift
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// Kingfisher
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//
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// Created by onevcat on 2018/09/28.
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//
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// Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
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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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import CoreGraphics
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extension CGSize: KingfisherCompatibleValue {}
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extension KingfisherWrapper where Base == CGSize {
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/// Returns a size by resizing the `base` size to a target size under a given content mode.
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///
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/// - Parameters:
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/// - size: The target size to resize to.
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/// - contentMode: Content mode of the target size should be when resizing.
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/// - Returns: The resized size under the given `ContentMode`.
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public func resize(to size: CGSize, for contentMode: ContentMode) -> CGSize {
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switch contentMode {
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case .aspectFit:
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return constrained(size)
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case .aspectFill:
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return filling(size)
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case .none:
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return size
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}
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}
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/// Returns a size by resizing the `base` size by making it aspect fitting the given `size`.
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///
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/// - Parameter size: The size in which the `base` should fit in.
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/// - Returns: The size fitted in by the input `size`, while keeps `base` aspect.
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public func constrained(_ size: CGSize) -> CGSize {
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let aspectWidth = round(aspectRatio * size.height)
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let aspectHeight = round(size.width / aspectRatio)
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return aspectWidth > size.width ?
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CGSize(width: size.width, height: aspectHeight) :
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CGSize(width: aspectWidth, height: size.height)
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}
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/// Returns a size by resizing the `base` size by making it aspect filling the given `size`.
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///
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/// - Parameter size: The size in which the `base` should fill.
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/// - Returns: The size be filled by the input `size`, while keeps `base` aspect.
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public func filling(_ size: CGSize) -> CGSize {
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let aspectWidth = round(aspectRatio * size.height)
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let aspectHeight = round(size.width / aspectRatio)
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return aspectWidth < size.width ?
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CGSize(width: size.width, height: aspectHeight) :
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CGSize(width: aspectWidth, height: size.height)
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}
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/// Returns a `CGRect` for which the `base` size is constrained to an input `size` at a given `anchor` point.
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///
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/// - Parameters:
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/// - size: The size in which the `base` should be constrained to.
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/// - anchor: An anchor point in which the size constraint should happen.
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/// - Returns: The result `CGRect` for the constraint operation.
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public func constrainedRect(for size: CGSize, anchor: CGPoint) -> CGRect {
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let unifiedAnchor = CGPoint(x: anchor.x.clamped(to: 0.0...1.0),
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y: anchor.y.clamped(to: 0.0...1.0))
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let x = unifiedAnchor.x * base.width - unifiedAnchor.x * size.width
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let y = unifiedAnchor.y * base.height - unifiedAnchor.y * size.height
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let r = CGRect(x: x, y: y, width: size.width, height: size.height)
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let ori = CGRect(origin: .zero, size: base)
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return ori.intersection(r)
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}
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private var aspectRatio: CGFloat {
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return base.height == 0.0 ? 1.0 : base.width / base.height
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}
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}
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extension CGRect {
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func scaled(_ scale: CGFloat) -> CGRect {
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return CGRect(x: origin.x * scale, y: origin.y * scale,
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width: size.width * scale, height: size.height * scale)
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}
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}
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extension Comparable {
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func clamped(to limits: ClosedRange<Self>) -> Self {
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return min(max(self, limits.lowerBound), limits.upperBound)
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}
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}
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