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annotate Sources/StockCharts/LineChart/Helpers/LinePath.swift @ 21:5135ff3343ae

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Rename project to StockCharts
author Dennis Concepción Martín <66180929+denniscm190@users.noreply.github.com>
date Fri, 30 Apr 2021 17:40:33 +0200
parents Sources/InteractiveCharts/LineChart/Helpers/LinePath.swift@136de51a74f2
children 127af64e264e
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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 var data: [Double]
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12 var (width, height): (CGFloat, CGFloat)
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13 @Binding var pathPoints: [CGPoint]
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15 public func path(in rect: CGRect) -> Path {
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16 var path = Path()
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17
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18 let normalizedData = normalize(data)
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19 let widthBetweenDataPoints = Double(width) / Double(normalizedData.count - 1) // Remove first point
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20 let initialPoint = normalizedData[0] * Double(height)
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21 var x: Double = 0
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23 path.move(to: CGPoint(x: x, y: initialPoint))
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24 for y in normalizedData {
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25 if normalizedData.firstIndex(of: y) != 0 { // Skip first point
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26 x += widthBetweenDataPoints
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27 let y = y * Double(height)
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28 path.addLine(to: CGPoint(x: x, y: y))
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29 }
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31 // Append current point to an array. Later will be used for Drag Gesture
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32 pathPoints.append(path.currentPoint!)
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33 }
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35 return path
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36 }
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38 /*
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39 Get data -> normalize it -> 0 <= output <= 1
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40 */
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41 public func normalize(_ data: [Double]) -> [Double] {
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42 var normalData = [Double]()
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43 let min = data.min()!
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44 let max = data.max()!
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46 for value in data {
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47 let normal = (value - min) / (max - min)
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48 normalData.append(normal)
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49 }
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51 return normalData
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52 }
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53 }
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