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

//
//  LineChartFilledViewController.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 LineChartFilledViewController: DemoBaseViewController {

    @IBOutlet var chartView: LineChartView!
    @IBOutlet var sliderX: UISlider!
    @IBOutlet var sliderY: UISlider!
    @IBOutlet var sliderTextX: UITextField!
    @IBOutlet var sliderTextY: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Do any additional setup after loading the view.
        self.title = "Filled Line Chart"
        
        chartView.delegate = self
        
        chartView.backgroundColor = .white
        chartView.gridBackgroundColor = UIColor(red: 51/255, green: 181/255, blue: 229/255, alpha: 150/255)
        chartView.drawGridBackgroundEnabled = true
        
        chartView.drawBordersEnabled = true
        
        chartView.chartDescription.enabled = false
        
        chartView.pinchZoomEnabled = false
        chartView.dragEnabled = true
        chartView.setScaleEnabled(true)
        
        chartView.legend.enabled = false
        
        chartView.xAxis.enabled = false
        
        let leftAxis = chartView.leftAxis
        leftAxis.axisMaximum = 900
        leftAxis.axisMinimum = -250
        leftAxis.drawAxisLineEnabled = false
        
        chartView.rightAxis.enabled = false
        
        sliderX.value = 100
        sliderY.value = 60
        slidersValueChanged(nil)
    }
    
    override func updateChartData() {
        if self.shouldHideData {
            chartView.data = nil
            return
        }
        
        self.setDataCount(Int(sliderX.value), range: UInt32(sliderY.value))
    }
    
    func setDataCount(_ count: Int, range: UInt32) {
        let yVals1 = (0..<count).map { (i) -> ChartDataEntry in
            let val = Double(arc4random_uniform(range) + 50)
            return ChartDataEntry(x: Double(i), y: val)
        }
        let yVals2 = (0..<count).map { (i) -> ChartDataEntry in
            let val = Double(arc4random_uniform(range) + 450)
            return ChartDataEntry(x: Double(i), y: val)
        }
        
        let set1 = LineChartDataSet(entries: yVals1, label: "DataSet 1")
        set1.axisDependency = .left
        set1.setColor(UIColor(red: 255/255, green: 241/255, blue: 46/255, alpha: 1))
        set1.drawCirclesEnabled = false
        set1.lineWidth = 2
        set1.circleRadius = 3
        set1.fillAlpha = 1
        set1.drawFilledEnabled = true
        set1.fillColor = .white
        set1.highlightColor = UIColor(red: 244/255, green: 117/255, blue: 117/255, alpha: 1)
        set1.drawCircleHoleEnabled = false
        set1.fillFormatter = DefaultFillFormatter { _,_  -> CGFloat in
            return CGFloat(self.chartView.leftAxis.axisMinimum)
        }
        
        let set2 = LineChartDataSet(entries: yVals2, label: "DataSet 2")
        set2.axisDependency = .left
        set2.setColor(UIColor(red: 255/255, green: 241/255, blue: 46/255, alpha: 1))
        set2.drawCirclesEnabled = false
        set2.lineWidth = 2
        set2.circleRadius = 3
        set2.fillAlpha = 1
        set2.drawFilledEnabled = true
        set2.fillColor = .white
        set2.highlightColor = UIColor(red: 244/255, green: 117/255, blue: 117/255, alpha: 1)
        set2.drawCircleHoleEnabled = false
        set2.fillFormatter = DefaultFillFormatter { _,_  -> CGFloat in
            return CGFloat(self.chartView.leftAxis.axisMaximum)
        }

        let data: LineChartData = [set1, set2]
        data.setDrawValues(false)
        
        chartView.data = data
    }
    
    @IBAction func slidersValueChanged(_ sender: Any?) {
        sliderTextX.text = "\(Int(sliderX.value))"
        sliderTextY.text = "\(Int(sliderY.value))"
        
        self.updateChartData()
    }
}