HorizontalBarChartViewController.swift

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

import UIKit
import Charts

class HorizontalBarChartViewController: DemoBaseViewController {

    @IBOutlet var chartView: HorizontalBarChartView!
    @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 = "Horizontal Bar Char"
        self.options = [.toggleValues,
                        .toggleIcons,
                        .toggleHighlight,
                        .animateX,
                        .animateY,
                        .animateXY,
                        .saveToGallery,
                        .togglePinchZoom,
                        .toggleAutoScaleMinMax,
                        .toggleData,
                        .toggleBarBorders]
        
        self.setup(barLineChartView: chartView)

        chartView.delegate = self
        
        chartView.drawBarShadowEnabled = false
        chartView.drawValueAboveBarEnabled = true
        
        chartView.maxVisibleCount = 60
        
        let xAxis = chartView.xAxis
        xAxis.labelPosition = .bottom
        xAxis.labelFont = .systemFont(ofSize: 10)
        xAxis.drawAxisLineEnabled = true
        xAxis.granularity = 10
        
        let leftAxis = chartView.leftAxis
        leftAxis.labelFont = .systemFont(ofSize: 10)
        leftAxis.drawAxisLineEnabled = true
        leftAxis.drawGridLinesEnabled = true
        leftAxis.axisMinimum = 0

        let rightAxis = chartView.rightAxis
        rightAxis.enabled = true
        rightAxis.labelFont = .systemFont(ofSize: 10)
        rightAxis.drawAxisLineEnabled = true
        rightAxis.axisMinimum = 0

        let l = chartView.legend
        l.horizontalAlignment = .left
        l.verticalAlignment = .bottom
        l.orientation = .horizontal
        l.drawInside = false
        l.form = .square
        l.formSize = 8
        l.font = UIFont(name: "HelveticaNeue-Light", size: 11)!
        l.xEntrySpace = 4
//        chartView.legend = l

        chartView.fitBars = true

        sliderX.value = 12
        sliderY.value = 50
        slidersValueChanged(nil)
        
        chartView.animate(yAxisDuration: 2.5)
    }
    
    override func updateChartData() {
        if self.shouldHideData {
            chartView.data = nil
            return
        }
        
        self.setDataCount(Int(sliderX.value) + 1, range: UInt32(sliderY.value))
    }
    
    func setDataCount(_ count: Int, range: UInt32) {
        let barWidth = 9.0
        let spaceForBar = 10.0
        
        let yVals = (0..<count).map { (i) -> BarChartDataEntry in
            let mult = range + 1
            let val = Double(arc4random_uniform(mult))
            return BarChartDataEntry(x: Double(i)*spaceForBar, y: val, icon: #imageLiteral(resourceName: "icon"))
        }
        
        let set1 = BarChartDataSet(entries: yVals, label: "DataSet")
        set1.drawIconsEnabled = false
        
        let data = BarChartData(dataSet: set1)
        data.setValueFont(UIFont(name:"HelveticaNeue-Light", size:10)!)
        data.barWidth = barWidth
        
        chartView.data = data
    }

    override func optionTapped(_ option: Option) {
        super.handleOption(option, forChartView: chartView)
    }
    
    // MARK: - Actions
    @IBAction func slidersValueChanged(_ sender: Any?) {
        sliderTextX.text = "\(Int(sliderX.value))"
        sliderTextY.text = "\(Int(sliderY.value))"
        
        self.updateChartData()
    }
}