120 lines
3.9 KiB
Swift
120 lines
3.9 KiB
Swift
/*
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* DynamicColor
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*
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* Copyright 2015-present Yannick Loriot.
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* http://yannickloriot.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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*
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*/
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#if os(iOS) || os(tvOS) || os(watchOS)
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import UIKit
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#elseif os(OSX)
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import AppKit
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#endif
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// MARK: RGBA Color Space
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public extension DynamicColor {
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/**
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Initializes and returns a color object using the specified opacity and RGB component values.
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Notes that values out of range are clipped.
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- Parameter r: The red component of the color object, specified as a value from 0.0 to 255.0.
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- Parameter g: The green component of the color object, specified as a value from 0.0 to 255.0.
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- Parameter b: The blue component of the color object, specified as a value from 0.0 to 255.0.
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- Parameter a: The opacity value of the color object, specified as a value from 0.0 to 255.0. The default value is 255.
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*/
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convenience init(r: CGFloat, g: CGFloat, b: CGFloat, a: CGFloat = 255) {
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self.init(red: clip(r, 0, 255) / 255, green: clip(g, 0, 255) / 255, blue: clip(b, 0, 255) / 255, alpha: clip(a, 0, 255) / 255)
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}
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// MARK: - Getting the RGBA Components
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/**
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Returns the RGBA (red, green, blue, alpha) components.
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- returns: The RGBA components as a tuple (r, g, b, a).
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*/
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final func toRGBAComponents() -> (r: CGFloat, g: CGFloat, b: CGFloat, a: CGFloat) {
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var r: CGFloat = 0, g: CGFloat = 0, b: CGFloat = 0, a: CGFloat = 0
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#if os(iOS) || os(tvOS) || os(watchOS)
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getRed(&r, green: &g, blue: &b, alpha: &a)
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return (r, g, b, a)
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#elseif os(OSX)
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guard let rgbaColor = self.usingColorSpace(.deviceRGB) else {
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fatalError("Could not convert color to RGBA.")
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}
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rgbaColor.getRed(&r, green: &g, blue: &b, alpha: &a)
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return (r, g, b, a)
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#endif
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}
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#if os(iOS) || os(tvOS) || os(watchOS)
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/**
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The red component as CGFloat between 0.0 to 1.0.
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*/
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final var redComponent: CGFloat {
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return toRGBAComponents().r
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}
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/**
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The green component as CGFloat between 0.0 to 1.0.
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*/
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final var greenComponent: CGFloat {
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return toRGBAComponents().g
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}
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/**
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The blue component as CGFloat between 0.0 to 1.0.
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*/
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final var blueComponent: CGFloat {
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return toRGBAComponents().b
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}
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/**
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The alpha component as CGFloat between 0.0 to 1.0.
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*/
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final var alphaComponent: CGFloat {
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return toRGBAComponents().a
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}
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#endif
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// MARK: - Setting the RGBA Components
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/**
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Creates and returns a color object with the alpha increased by the given amount.
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- parameter amount: CGFloat between 0.0 and 1.0.
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- returns: A color object with its alpha channel modified.
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*/
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final func adjustedAlpha(amount: CGFloat) -> DynamicColor {
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let components = toRGBAComponents()
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let normalizedAlpha = clip(components.a + amount, 0.0, 1.0)
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return DynamicColor(red: components.r, green: components.g, blue: components.b, alpha: normalizedAlpha)
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}
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}
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