Nested Gauge

NestedGauge.Swift

//
//  NestedGauge.swift
//  circle
//
//  Created by Dima Vartanian on 5/10/17.
//  Copyright © 2017 Dima Vartanian. All rights reserved.
//

import UIKit

class NestedGauge: UIView {
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        let path = UIBezierPath()
        let path2 = UIBezierPath()
        let outerRadius: CGFloat = (self.bounds.size.width / 2)
        let innerRadius: CGFloat = outerRadius - 20
        let outerRadius2: CGFloat = innerRadius - 5
        let innerRadius2: CGFloat = outerRadius2 - 20
        let sliceCount = 30
        let fullCircle = CGFloat(2 * M_PI)
        for i in 0..<sliceCount {
            let angle = CGFloat(i) * fullCircle / CGFloat(sliceCount)
            
            UIColor.red.setStroke()
            let inner = CGPoint(x: innerRadius * cos(angle), y: innerRadius * sin(angle))
            let outer = CGPoint(x: outerRadius * cos(angle), y: outerRadius * sin(angle))
            path.move(to: CGPoint(x: inner.x + outerRadius, y: inner.y + outerRadius))
            path.addLine(to: CGPoint(x: outer.x + outerRadius, y: outer.y + outerRadius))
            path.stroke()
            
            UIColor.blue.setStroke()
            let inner2 = CGPoint(x: innerRadius2 * cos(angle), y: innerRadius2 * sin(angle))
            let outer2 = CGPoint(x: outerRadius2 * cos(angle), y: outerRadius2 * sin(angle))
            path2.move(to: CGPoint(x: inner2.x + outerRadius, y: inner2.y + outerRadius))
            path2.addLine(to: CGPoint(x: outer2.x + outerRadius, y: outer2.y + outerRadius))
            path2.stroke()
        }
    }
}