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annotate Sources/StockCharts/LineChart/Helpers/LinePath.swift @ 71:c37c93ba3f37

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Fixing: Modifying state during view update
author Dennis Concepción Martín <66180929+denniscm190@users.noreply.github.com>
date Sat, 08 May 2021 18:48:49 +0200
parents c19e9c03e09d
children 552963ee4dc4
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1 //
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2 // LinePath.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 LinePath: Shape {
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11 public var data: [Double]
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12 public var (width, height): (CGFloat, CGFloat)
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14 @Binding var pathPoints: [CGPoint]
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16 public func path(in rect: CGRect) -> Path {
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17 var path = Path()
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18 var pathPoints = [CGPoint]()
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20 let normalizedData = normalize(data)
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21 let widthBetweenDataPoints = Double(width) / Double(normalizedData.count - 1) // Remove first point
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22 let initialPoint = normalizedData[0] * Double(height)
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23 var x: Double = 0
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25 path.move(to: CGPoint(x: x, y: initialPoint))
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26 for y in normalizedData {
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27 if normalizedData.firstIndex(of: y) != 0 { // Skip first point
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28 x += widthBetweenDataPoints
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29 let y = y * Double(height)
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30 path.addLine(to: CGPoint(x: x, y: y))
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31 }
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33 // Append current point to an array. Later will be used for Drag Gesture
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34 pathPoints.append(path.currentPoint!)
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35 }
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37 self.pathPoints = pathPoints
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39 return path
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40 }
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42 /*
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43 Get data -> normalize it -> 0 <= output <= 1
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44 */
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45 public func normalize(_ data: [Double]) -> [Double] {
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46 var normalData = [Double]()
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47 let min = data.min()!
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48 let max = data.max()!
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50 for value in data {
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51 let normal = (value - min) / (max - min)
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52 normalData.append(normal)
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53 }
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55 return normalData
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56 }
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57 }
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