ninjaprox/NVActivityIndicatorView

//
//  NVActivityIndicatorAnimationPacman.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 NVActivityIndicatorAnimationPacman: NVActivityIndicatorAnimationDelegate {

    func setUpAnimation(in layer: CALayer, size: CGSize, color: UIColor) {
        circleInLayer(layer, size: size, color: color)
        pacmanInLayer(layer, size: size, color: color)
    }

    func pacmanInLayer(_ layer: CALayer, size: CGSize, color: UIColor) {
        let pacmanSize = 2 * size.width / 3
        let pacmanDuration: CFTimeInterval = 0.5
        let timingFunction = CAMediaTimingFunction(name: .default)

        // Stroke start animation
        let strokeStartAnimation = CAKeyframeAnimation(keyPath: "strokeStart")

        strokeStartAnimation.keyTimes = [0, 0.5, 1]
        strokeStartAnimation.timingFunctions = [timingFunction, timingFunction]
        strokeStartAnimation.values = [0.125, 0, 0.125]
        strokeStartAnimation.duration = pacmanDuration

        // Stroke end animation
        let strokeEndAnimation = CAKeyframeAnimation(keyPath: "strokeEnd")

        strokeEndAnimation.keyTimes = [0, 0.5, 1]
        strokeEndAnimation.timingFunctions = [timingFunction, timingFunction]
        strokeEndAnimation.values = [0.875, 1, 0.875]
        strokeEndAnimation.duration = pacmanDuration

        // Animation
        let animation = CAAnimationGroup()

        animation.animations = [strokeStartAnimation, strokeEndAnimation]
        animation.duration = pacmanDuration
        animation.repeatCount = HUGE
        animation.isRemovedOnCompletion = false

        // Draw pacman
        let pacman = NVActivityIndicatorShape.pacman.layerWith(size: CGSize(width: pacmanSize, height: pacmanSize), color: color)
        let frame = CGRect(
            x: (layer.bounds.size.width - size.width) / 2,
            y: (layer.bounds.size.height - pacmanSize) / 2,
            width: pacmanSize,
            height: pacmanSize
        )

        pacman.frame = frame
        pacman.add(animation, forKey: "animation")
        layer.addSublayer(pacman)
    }

    func circleInLayer(_ layer: CALayer, size: CGSize, color: UIColor) {
        let circleSize = size.width / 5
        let circleDuration: CFTimeInterval = 1

        // Translate animation
        let translateAnimation = CABasicAnimation(keyPath: "transform.translation.x")

        translateAnimation.fromValue = 0
        translateAnimation.toValue = -size.width / 2
        translateAnimation.duration = circleDuration

        // Opacity animation
        let opacityAnimation = CABasicAnimation(keyPath: "opacity")

        opacityAnimation.fromValue = 1
        opacityAnimation.toValue = 0.7
        opacityAnimation.duration = circleDuration

        // Animation
        let animation = CAAnimationGroup()

        animation.animations = [translateAnimation, opacityAnimation]
        animation.timingFunction = CAMediaTimingFunction(name: .linear)
        animation.duration = circleDuration
        animation.repeatCount = HUGE
        animation.isRemovedOnCompletion = false

        // Draw circles
        let circle = NVActivityIndicatorShape.circle.layerWith(size: CGSize(width: circleSize, height: circleSize), color: color)
        let frame = CGRect(
            x: (layer.bounds.size.width - size.width) / 2 + size.width - circleSize,
            y: (layer.bounds.size.height - circleSize) / 2,
            width: circleSize,
            height: circleSize
        )

        circle.frame = frame
        circle.add(animation, forKey: "animation")
        layer.addSublayer(circle)
    }
}
#endif