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annotate Sources/StockCharts/LineChart/Helpers/LineView.swift @ 116:5057c45046c1

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Add default initializers
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Mon, 09 Aug 2021 16:32:45 +0100
parents f53d8b9ca92b
children
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1 //
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2 // LineView.swift
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3 // StockCharts
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4 //
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5 // Created by Dennis Concepción Martín on 30/4/21.
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6 //
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7
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8 import SwiftUI
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10 public struct LineView: View {
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11 public var lineChartController: LineChartController
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13 @Binding var showingIndicators: Bool
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14 @Binding var indexPosition: Int
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15 @State var IndicatorPointPosition: CGPoint = .zero
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16 @State var pathPoints = [CGPoint]()
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18 public var body: some View {
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19 ZStack {
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20 GeometryReader { proxy in
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21 LinePath(data: lineChartController.prices, width: proxy.size.width, height: proxy.size.height, pathPoints: $pathPoints)
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22 .stroke(colorLine(), lineWidth: 2)
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23 }
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25 if showingIndicators {
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26 IndicatorPoint(lineChartController: lineChartController)
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27 .position(x: IndicatorPointPosition.x, y: IndicatorPointPosition.y)
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28 }
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29 }
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30 .rotationEffect(.degrees(180), anchor: .center)
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31 .rotation3DEffect(.degrees(180), axis: (x: 0.0, y: 1.0, z: 0.0))
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32 .contentShape(Rectangle()) // Control tappable area
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33 .gesture(lineChartController.dragGesture ?
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34 LongPressGesture(minimumDuration: 0.2)
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35 .sequenced(before: DragGesture(minimumDistance: 0, coordinateSpace: .local))
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36 .onChanged({ value in // Get value of the gesture
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37 switch value {
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38 case .second(true, let drag):
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39 if let longPressLocation = drag?.location {
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40 dragGesture(longPressLocation)
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41 }
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42 default:
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43 break
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44 }
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45 })
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46 // Hide indicator when finish
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47 .onEnded({ value in
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48 self.showingIndicators = false
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49 })
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50 : nil // On dragGesture = false
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51 )
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52 }
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54 /*
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55 Color path depending on data.
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56 */
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57 public func colorLine() -> Color {
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58 var color = lineChartController.uptrendLineColor
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60 if showingIndicators {
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61 color = lineChartController.showingIndicatorLineColor
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62 } else if lineChartController.prices.first! > lineChartController.prices.last! {
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63 color = lineChartController.downtrendLineColor
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64 } else if lineChartController.prices.first! == lineChartController.prices.last! {
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65 color = lineChartController.flatTrendLineColor
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66 }
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68 return color
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69 }
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71 /*
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72 When the user drag on Path -> Modifiy indicator point to move it on the path accordingly
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73 */
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74 public func dragGesture(_ longPressLocation: CGPoint) {
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75 let (closestXPoint, closestYPoint, yPointIndex) = getClosestValueFrom(longPressLocation, inData: pathPoints)
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76 self.IndicatorPointPosition.x = closestXPoint
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77 self.IndicatorPointPosition.y = closestYPoint
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78 self.showingIndicators = true
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79 self.indexPosition = yPointIndex
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80 }
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82 /*
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83 First, search the closest X point in Path from the tapped location.
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84 Then, find the correspondent Y point in Path.
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85 */
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86 public func getClosestValueFrom(_ value: CGPoint, inData: [CGPoint]) -> (CGFloat, CGFloat, Int) {
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87 let touchPoint: (CGFloat, CGFloat) = (value.x, value.y)
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88 let xPathPoints = inData.map { $0.x }
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89 let yPathPoints = inData.map { $0.y }
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91 // Closest X value
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92 let closestXPoint = xPathPoints.enumerated().min( by: { abs($0.1 - touchPoint.0) < abs($1.1 - touchPoint.0) } )!
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93 let closestYPointIndex = xPathPoints.firstIndex(of: closestXPoint.element)!
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94 let closestYPoint = yPathPoints[closestYPointIndex]
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96 // Index of the closest points in the array
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97 let yPointIndex = yPathPoints.firstIndex(of: closestYPoint)!
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99 return (closestXPoint.element, closestYPoint, yPointIndex)
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100 }
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101 }