Charts/ChartsDemo-iOS/Swift/Demos/LineChartTimeViewController.swift

//
//  LineChartTimeViewController.swift
//  ChartsDemo-iOS
//
//  Created by Jacob Christie on 2017-07-09.
//  Copyright © 2017 jc. All rights reserved.
//

#if canImport(UIKit)
    import UIKit
#endif
import Charts

class LineChartTimeViewController: DemoBaseViewController {
    @IBOutlet var chartView: LineChartView!
    @IBOutlet var sliderX: UISlider!
    @IBOutlet var sliderTextX: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Do any additional setup after loading the view.
        self.title = "Time Line Chart"
        self.options = [.toggleValues,
                        .toggleFilled,
                        .toggleCircles,
                        .toggleCubic,
                        .toggleHorizontalCubic,
                        .toggleStepped,
                        .toggleHighlight,
                        .animateX,
                        .animateY,
                        .animateXY,
                        .saveToGallery,
                        .togglePinchZoom,
                        .toggleAutoScaleMinMax,
                        .toggleData]
        
        chartView.delegate = self
        
        chartView.chartDescription?.enabled = false
        
        chartView.dragEnabled = true
        chartView.setScaleEnabled(true)
        chartView.pinchZoomEnabled = false
        chartView.highlightPerDragEnabled = true
        
        chartView.backgroundColor = .white
        
        chartView.legend.enabled = false
        
        let xAxis = chartView.xAxis
        xAxis.labelPosition = .topInside
        xAxis.labelFont = .systemFont(ofSize: 10, weight: .light)
        xAxis.labelTextColor = UIColor(red: 255/255, green: 192/255, blue: 56/255, alpha: 1)
        xAxis.drawAxisLineEnabled = false
        xAxis.drawGridLinesEnabled = true
        xAxis.centerAxisLabelsEnabled = true
        xAxis.granularity = 3600
        xAxis.valueFormatter = DateValueFormatter()
        
        let leftAxis = chartView.leftAxis
        leftAxis.labelPosition = .insideChart
        leftAxis.labelFont = .systemFont(ofSize: 12, weight: .light)
        leftAxis.drawGridLinesEnabled = true
        leftAxis.granularityEnabled = true
        leftAxis.axisMinimum = 0
        leftAxis.axisMaximum = 170
        leftAxis.yOffset = -9
        leftAxis.labelTextColor = UIColor(red: 255/255, green: 192/255, blue: 56/255, alpha: 1)

        
        chartView.rightAxis.enabled = false
        
        chartView.legend.form = .line
        
        sliderX.value = 100
        slidersValueChanged(nil)
        
        chartView.animate(xAxisDuration: 2.5)
    }
    
    override func updateChartData() {
        if self.shouldHideData {
            chartView.data = nil
            return
        }
        
        self.setDataCount(Int(sliderX.value), range: 30)
    }
    
    func setDataCount(_ count: Int, range: UInt32) {
        let now = Date().timeIntervalSince1970
        let hourSeconds: TimeInterval = 3600
        
        let from = now - (Double(count) / 2) * hourSeconds
        let to = now + (Double(count) / 2) * hourSeconds
        
        let values = stride(from: from, to: to, by: hourSeconds).map { (x) -> ChartDataEntry in
            let y = arc4random_uniform(range) + 50
            return ChartDataEntry(x: x, y: Double(y))
        }
        
        let set1 = LineChartDataSet(entries: values, label: "DataSet 1")
        set1.axisDependency = .left
        set1.setColor(UIColor(red: 51/255, green: 181/255, blue: 229/255, alpha: 1))
        set1.lineWidth = 1.5
        set1.drawCirclesEnabled = false
        set1.drawValuesEnabled = false
        set1.fillAlpha = 0.26
        set1.fillColor = UIColor(red: 51/255, green: 181/255, blue: 229/255, alpha: 1)
        set1.highlightColor = UIColor(red: 244/255, green: 117/255, blue: 117/255, alpha: 1)
        set1.drawCircleHoleEnabled = false
        
        let data = LineChartData(dataSet: set1)
        data.setValueTextColor(.white)
        data.setValueFont(.systemFont(ofSize: 9, weight: .light))
        
        chartView.data = data
    }
    
    override func optionTapped(_ option: Option) {
        switch option {
        case .toggleFilled:
            for set in chartView.data!.dataSets as! [LineChartDataSet] {
                set.drawFilledEnabled = !set.drawFilledEnabled
            }
            chartView.setNeedsDisplay()
            
        case .toggleCircles:
            for set in chartView.data!.dataSets as! [LineChartDataSet] {
                set.drawCirclesEnabled = !set.drawCirclesEnabled
            }
            chartView.setNeedsDisplay()
            
        case .toggleCubic:
            for set in chartView.data!.dataSets as! [LineChartDataSet] {
                set.mode = (set.mode == .cubicBezier) ? .linear : .cubicBezier
            }
            chartView.setNeedsDisplay()
            
        case .toggleStepped:
            for set in chartView.data!.dataSets as! [LineChartDataSet] {
                set.mode = (set.mode == .stepped) ? .linear : .stepped
            }
            chartView.setNeedsDisplay()
            
        case .toggleHorizontalCubic:
            for set in chartView.data!.dataSets as! [LineChartDataSet] {
                set.mode = (set.mode == .cubicBezier) ? .horizontalBezier : .cubicBezier
            }
            chartView.setNeedsDisplay()
            
        default:
            super.handleOption(option, forChartView: chartView)
        }
    }
    
    @IBAction func slidersValueChanged(_ sender: Any?) {
        sliderTextX.text = "\(Int(sliderX.value))"
        self.updateChartData()
    }
}