106 lines
3.7 KiB
Swift
106 lines
3.7 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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/**
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Object representing a gradient object. It allows you to manipulate colors inside different gradients and color spaces.
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*/
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final public class DynamicGradient {
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let colors: [DynamicColor]
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/**
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Initializes and creates a gradient from a color array.
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- Parameter colors: An array of colors.
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*/
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public init(colors: [DynamicColor]) {
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self.colors = colors
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}
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/**
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Returns the color palette of `amount` elements by grabbing equidistant colors.
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- Parameter amount: An amount of colors to return. 2 by default.
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- Parameter colorspace: The color space used to mix the colors. By default it uses the RBG color space.
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- Returns: An array of DynamicColor objects with equi-distant space in the gradient.
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*/
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public func colorPalette(amount: UInt = 2, inColorSpace colorspace: DynamicColorSpace = .rgb) -> [DynamicColor] {
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guard amount > 0 && colors.count > 0 else {
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return []
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}
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guard colors.count > 1 else {
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return (0 ..< amount).map { _ in colors[0] }
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}
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let increment = 1 / CGFloat(amount - 1)
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return (0 ..< amount).map { pickColorAt(scale: CGFloat($0) * increment, inColorSpace: colorspace) }
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}
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/**
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Picks up and returns the color at the given scale by interpolating the colors.
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For example, given this color array `[red, green, blue]` and a scale of `0.25` you will get a kaki color.
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- Parameter scale: A float value between 0.0 and 1.0.
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- Parameter colorspace: The color space used to mix the colors. By default it uses the RBG color space.
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- Returns: A DynamicColor object corresponding to the color at the given scale.
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*/
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public func pickColorAt(scale: CGFloat, inColorSpace colorspace: DynamicColorSpace = .rgb) -> DynamicColor {
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guard colors.count > 1 else {
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return colors.first ?? .black
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}
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let clippedScale = clip(scale, 0, 1)
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let positions = (0 ..< colors.count).map { CGFloat($0) / CGFloat(colors.count - 1) }
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var color: DynamicColor = .black
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for (index, position) in positions.enumerated() {
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guard clippedScale <= position else { continue }
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guard clippedScale != 0 && clippedScale != 1 else {
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return colors[index]
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}
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let previousPosition = positions[index - 1]
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let weight = (clippedScale - previousPosition) / (position - previousPosition)
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color = colors[index - 1].mixed(withColor: colors[index], weight: weight, inColorSpace: colorspace)
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break
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}
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return color
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}
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}
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