Sources/Base/Animations/NVActivityIndicatorAnimationOrbit.swift
//
// NVActivityIndicatorAnimationOrbit.swift
// NVActivityIndicatorView
//
// The MIT License (MIT)
// Copyright (c) 2016 Vinh Nguyen
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
#if canImport(UIKit)
import UIKit
class NVActivityIndicatorAnimationOrbit: NVActivityIndicatorAnimationDelegate {
let duration: CFTimeInterval = 1.9
let satelliteCoreRatio: CGFloat = 0.25
let distanceRatio: CGFloat = 1.5 // distance / core size
var coreSize: CGFloat = 0
var satelliteSize: CGFloat = 0
func setUpAnimation(in layer: CALayer, size: CGSize, color: UIColor) {
coreSize = size.width / (1 + satelliteCoreRatio + distanceRatio)
satelliteSize = coreSize * satelliteCoreRatio
ring1InLayer(layer, size: size, color: color)
ring2InLayer(layer, size: size, color: color)
coreInLayer(layer, size: size, color: color)
satelliteInLayer(layer, size: size, color: color)
}
func ring1InLayer(_ layer: CALayer, size _: CGSize, color: UIColor) {
// Scale animation
let scaleAnimation = CAKeyframeAnimation(keyPath: "transform.scale")
scaleAnimation.keyTimes = [0, 0.45, 0.45, 1]
scaleAnimation.timingFunction = CAMediaTimingFunction(name: .linear)
scaleAnimation.values = [0, 0, 1.3, 2]
scaleAnimation.duration = duration
// Opacity animation
let opacityAnimation = CAKeyframeAnimation(keyPath: "opacity")
let timingFunction = CAMediaTimingFunction(controlPoints: 0.19, 1, 0.22, 1)
opacityAnimation.keyTimes = [0, 0.45, 1]
scaleAnimation.timingFunctions = [CAMediaTimingFunction(name: .linear), timingFunction]
opacityAnimation.values = [0.8, 0.8, 0]
opacityAnimation.duration = duration
// Animation
let animation = CAAnimationGroup()
animation.animations = [scaleAnimation, opacityAnimation]
animation.duration = duration
animation.repeatCount = HUGE
animation.isRemovedOnCompletion = false
// Draw circle
let circle = NVActivityIndicatorShape.circle.layerWith(size: CGSize(width: coreSize, height: coreSize), color: color)
let frame = CGRect(x: (layer.bounds.size.width - coreSize) / 2,
y: (layer.bounds.size.height - coreSize) / 2,
width: coreSize,
height: coreSize)
circle.frame = frame
circle.add(animation, forKey: "animation")
layer.addSublayer(circle)
}
func ring2InLayer(_ layer: CALayer, size _: CGSize, color: UIColor) {
// Scale animation
let scaleAnimation = CAKeyframeAnimation(keyPath: "transform.scale")
scaleAnimation.keyTimes = [0, 0.55, 0.55, 1]
scaleAnimation.timingFunction = CAMediaTimingFunction(name: .linear)
scaleAnimation.values = [0, 0, 1.3, 2.1]
scaleAnimation.duration = duration
// Opacity animation
let opacityAnimation = CAKeyframeAnimation(keyPath: "opacity")
let timingFunction = CAMediaTimingFunction(controlPoints: 0.19, 1, 0.22, 1)
opacityAnimation.keyTimes = [0, 0.55, 0.65, 1]
scaleAnimation.timingFunctions = [CAMediaTimingFunction(name: .linear), timingFunction]
opacityAnimation.values = [0.7, 0.7, 0, 0]
opacityAnimation.duration = duration
// Animation
let animation = CAAnimationGroup()
animation.animations = [scaleAnimation, opacityAnimation]
animation.duration = duration
animation.repeatCount = HUGE
animation.isRemovedOnCompletion = false
// Draw circle
let circle = NVActivityIndicatorShape.circle.layerWith(size: CGSize(width: coreSize, height: coreSize), color: color)
let frame = CGRect(x: (layer.bounds.size.width - coreSize) / 2,
y: (layer.bounds.size.height - coreSize) / 2,
width: coreSize,
height: coreSize)
circle.frame = frame
circle.add(animation, forKey: "animation")
layer.addSublayer(circle)
}
func coreInLayer(_ layer: CALayer, size _: CGSize, color: UIColor) {
let inTimingFunction = CAMediaTimingFunction(controlPoints: 0.7, 0, 1, 0.5)
let outTimingFunction = CAMediaTimingFunction(controlPoints: 0, 0.7, 0.5, 1)
let standByTimingFunction = CAMediaTimingFunction(name: .linear)
// Scale animation
let scaleAnimation = CAKeyframeAnimation(keyPath: "transform.scale")
scaleAnimation.keyTimes = [0, 0.45, 0.55, 1]
scaleAnimation.timingFunctions = [inTimingFunction, standByTimingFunction, outTimingFunction]
scaleAnimation.values = [1, 1.3, 1.3, 1]
scaleAnimation.duration = duration
scaleAnimation.repeatCount = HUGE
scaleAnimation.isRemovedOnCompletion = false
// Draw circle
let circle = NVActivityIndicatorShape.circle.layerWith(size: CGSize(width: coreSize, height: coreSize), color: color)
let frame = CGRect(x: (layer.bounds.size.width - coreSize) / 2,
y: (layer.bounds.size.height - coreSize) / 2,
width: coreSize,
height: coreSize)
circle.frame = frame
circle.add(scaleAnimation, forKey: "animation")
layer.addSublayer(circle)
}
func satelliteInLayer(_ layer: CALayer, size: CGSize, color: UIColor) {
// Rotate animation
let rotateAnimation = CAKeyframeAnimation(keyPath: "position")
rotateAnimation.path = UIBezierPath(arcCenter: CGPoint(x: layer.bounds.midX, y: layer.bounds.midY),
radius: (size.width - satelliteSize) / 2,
startAngle: CGFloat(Double.pi * 1.5),
endAngle: CGFloat(Double.pi * 1.5 + 4 * Double.pi),
clockwise: true).cgPath
rotateAnimation.duration = duration * 2
rotateAnimation.repeatCount = HUGE
rotateAnimation.isRemovedOnCompletion = false
// Draw circle
let circle = NVActivityIndicatorShape.circle.layerWith(size: CGSize(width: satelliteSize, height: satelliteSize), color: color)
let frame = CGRect(x: 0, y: 0, width: satelliteSize, height: satelliteSize)
circle.frame = frame
circle.add(rotateAnimation, forKey: "animation")
layer.addSublayer(circle)
}
}
#endif