TT.swift

//
//  PortionProgress.swift
//  PortionProgress
//
//  Created by Erison Veshi on 7/24/16.
//  Copyright © 2016 Bashta. All rights reserved.
//

import UIKit

@IBDesignable
public final class ProportionProgressView: UIView {
    
    @IBInspectable public var widthRatio: CGFloat = 0.14
    @IBInspectable public var heightRatio: CGFloat = 0.2
    
    @IBInspectable public var progressPercentage: CGFloat = 0.5 {
        didSet {
//            self.setNeedsDisplay()
        }
    }

    @IBInspectable public var trackTint: UIColor = UIColor.grayColor()
    @IBInspectable public var trackWidth: CGFloat = 1
    public var trackCapStyle: CGLineCap = .Round
    
    @IBInspectable public var progressTint: UIColor = UIColor.orangeColor()
    @IBInspectable public var progressWidth: CGFloat = 1
    public var progressCapStyle: CGLineCap = .Round


    public override func drawRect(rect: CGRect) {
        drawTrackArcInRect(rect)
        drawProgressArcInRect(rect)
        drawPropertionRectangleInRect(rect)
    }
}

private extension ProportionProgressView {
    //MARK:- Drawing Helpers
    func drawTrackArcInRect(rect: CGRect) {
        let positionX = CGRectGetWidth(rect) / 2
        let positionY = (CGRectGetHeight(rect) / 2) * heightRatio
    
        let startAngle = -CGFloat(M_PI_2)
        let endAngle = startAngle + CGFloat(2 * M_PI)
        
        let trackArc = UIBezierPath(arcCenter: CGPoint(x: positionX, y: positionY),
                                    radius: (CGRectGetWidth(rect) / 2) * heightRatio,
                                    startAngle: startAngle,
                                    endAngle: endAngle,
                                    clockwise: true)
        
        trackArc.lineCapStyle = trackCapStyle
        trackArc.lineWidth = trackWidth
        trackTint.setStroke()
        trackArc.stroke()
    }
    
    func drawProgressArcInRect(rect: CGRect) {
        let positionX = CGRectGetWidth(rect) / 2
        let positionY = (CGRectGetHeight(rect) / 2) * heightRatio

        let progressAngle = CGFloat(progressPercentage) * CGFloat(2 * M_PI)
        
        let startAngle = -CGFloat(M_PI_2)
        let endAngle = startAngle + progressAngle

        let progressArc =  UIBezierPath(arcCenter: CGPoint(x: positionX, y: positionY),
                                        radius: (CGRectGetWidth(rect) / 2) * heightRatio,
                                        startAngle: startAngle,
                                        endAngle: endAngle,
                                        clockwise: true)
        
        progressArc.lineCapStyle = progressCapStyle
        progressArc.lineWidth = progressWidth
        progressTint.setStroke()
        progressArc.stroke()
    }
    
    func drawPropertionRectangleInRect(rect: CGRect) {
        
    }
}