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LiquidCircleEffect.swift
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LiquidCircleEffect.swift
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//
// LiquidCircleLoader.swift
// LiquidLoading
//
// Created by Takuma Yoshida on 2015/08/21.
// Copyright (c) 2015年 yoavlt. All rights reserved.
//
import Foundation
import UIKit
class LiquidCircleEffect : LiquidLoadEffect {
var radius: CGFloat {
get {
return loader!.frame.width * 0.5
}
}
override func setupShape() -> [LiquittableCircle] {
return Array(0..<numberOfCircles).map { i in
let angle = CGFloat(i) * CGFloat(2 * M_PI) / 8.0
let frame = self.loader.frame
let center = CGMath.circlePoint(frame.center.minus(frame.origin), radius: self.radius - self.circleRadius, rad: angle)
return LiquittableCircle(
center: center,
radius: self.circleRadius,
color: self.color,
growColor: self.growColor
)
}
}
override func movePosition(key: CGFloat) -> CGPoint {
guard self.loader != nil else {return CGPointZero}
let frame = self.loader!.frame.center.minus(self.loader!.frame.origin)
return CGMath.circlePoint(
frame,
radius: self.radius - self.circleRadius,
rad: self.key * CGFloat(2 * M_PI)
)
}
override func update() {
switch key {
case 0.0...1.0:
key += 1/(duration*60)
default:
key = key - 1.0
}
}
override func willSetup() {
self.circleRadius = loader.frame.width * 0.09
self.circleScale = 1.10
self.engine = SimpleCircleLiquidEngine(radiusThresh: self.circleRadius * 0.85, angleThresh: 0.5)
let moveCircleRadius = circleRadius * moveScale
moveCircle = LiquittableCircle(center: movePosition(0.0), radius: moveCircleRadius, color: self.color, growColor: self.growColor)
}
override func resize() {
guard moveCircle != nil else { return }
guard loader != nil else { return }
let moveVec = moveCircle!.center.minus(loader.center.minus(loader.frame.origin)).normalized()
circles.map { circle in
return (circle, moveVec.dot(circle.center.minus(self.loader.center.minus(self.loader.frame.origin)).normalized()))
}.each { (let circle, let dot) in
if 0.75 < dot && dot <= 1.0 {
let normalized = (dot - 0.75) / 0.25
let scale = normalized * normalized
circle.radius = self.circleRadius + (self.circleRadius * self.circleScale - self.circleRadius) * scale
} else {
circle.radius = self.circleRadius
}
}
}
}