//
// O2UISignatureView.swift
// O2Platform
//
// Created by FancyLou on 2018年8月28日.
// Copyright © 2018 zoneland. All rights reserved.
//

import UIKit
import CocoaLumberjack


class O2UISignatureView: UIView {
 
 //MARK: - arguments
 var control: Int!
 var beizerPath: UIBezierPath!
 var points:[CGPoint] = [CGPoint](repeating: CGPoint(), count: 5)
 
 required init?(coder aDecoder: NSCoder) {
 super.init(coder: aDecoder)
 self.initArguments()
 }
 
 override init(frame: CGRect) {
 super.init(frame: frame)
 self.initArguments()
 }
 
 private func initArguments() {
 self.backgroundColor = UIColor.white //背景颜色
 self.isMultipleTouchEnabled = false
 self.beizerPath = UIBezierPath()
 self.beizerPath.lineWidth = 2
 }
 
 override func draw(_ rect: CGRect) {
 let color = UIColor.black
 color.setStroke()
 self.beizerPath.stroke()
 }
 
 override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
 self.control = 0
 if let point = touches.first?.location(in: self) {
 points[0] = point
 let startPoint = points[0]
 let endPoint = CGPoint(x: startPoint.x + 1.5, y: startPoint.y + 2)
 self.beizerPath.move(to: startPoint)
 self.beizerPath.addLine(to: endPoint)
 }
 }
 
 override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
 if let point = touches.first?.location(in: self) {
 self.control = self.control + 1
 points[self.control] = point
 if self.control == 4 {
 points[3] = CGPoint(x: (points[2].x + points[4].x)/2.0, y: (points[2].y + points[4].y)/2.0)
 //设置画笔起始点
 self.beizerPath.move(to: points[0])
 //endPoint终点 controlPoint1、controlPoint2控制点
 self.beizerPath.addCurve(to: points[3], controlPoint1: points[1], controlPoint2: points[2])
 //setNeedsDisplay会自动调用drawRect方法,这样可以拿到UIGraphicsGetCurrentContext,就可以画画了
 self.setNeedsDisplay()
 points[0] = points[3]
 points[1] = points[4]
 self.control = 1
 }
 }
 }
 
 // 设置笔粗细
 func setLineSize(lineSize: CGFloat) {
 DDLogDebug("line size : \(lineSize)")
 self.beizerPath.lineWidth = lineSize
 }
 
 // 清除内容
 func clearSignature() {
 self.beizerPath.removeAllPoints()
 self.setNeedsDisplay()
 DDLogDebug("is empty: \(self.beizerPath.isEmpty)")
 }
 
 // 生成签名图片
 func getSignatureImage() -> UIImage? {
 if self.beizerPath.isEmpty {
 return nil
 }
 UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, UIScreen.main.scale)
 self.layer.render(in: UIGraphicsGetCurrentContext()!)
 let image = UIGraphicsGetImageFromCurrentImageContext()
 UIGraphicsEndImageContext()
 if image != nil {
 let documentsURL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0]
 let fileURL = documentsURL.appendingPathComponent("signature.png")
 do {
 try image?.pngData()?.write(to: fileURL, options: .atomic)
 }catch {
 DDLogError("写入本地异常,\(error.localizedDescription)")
 }
 return image!
 }else {
 return nil
 }
 
 }
 
 
 
}