//
//  GameScreen.swift
//  LineRider
//
//  Created by Andrew Solesa on 2017-04-14.
//  Copyright © 2017 KSG. All rights reserved.
//

import UIKit

class GameScreen: UIScrollView
{
    // LINE VARIABLES

    var lastPoint = CGPoint.zero
    var red: CGFloat = 0.0
    var green: CGFloat = 0.0
    var blue: CGFloat = 0.0
    var brushWidth: CGFloat = 10.0
    var opacity: CGFloat = 1.0
    var swiped = false

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?)
    {
        print("TOUCHED")
        swiped = false

        if let touch = touches.first
        {
            lastPoint = touch.location(in: self)
        }
    }

    func drawLine(from fromPoint: CGPoint, to toPoint: CGPoint)
    {
        UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0)

        let context = UIGraphicsGetCurrentContext()

        context?.move(to: fromPoint)
        context?.addLine(to: toPoint)

        context?.setLineCap(CGLineCap.round)
        context?.setLineWidth(brushWidth)
        context?.setStrokeColor(red: red, green: green, blue: blue, alpha: 1.0)
        context?.setBlendMode(CGBlendMode.normal)
        context?.strokePath()

        UIGraphicsEndImageContext()
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?)
    {
        print("MOVED")
        swiped = true

        if let touch = touches.first
        {
            print("CREATING POINT")
            let currentPoint = touch.location(in: self)
            drawLine(from: lastPoint, to: currentPoint)

            lastPoint = currentPoint
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?)
    {
        if !swiped
        {
            self.drawLine(from: lastPoint, to: lastPoint)
        }
    }
}