stock-charts: InteractiveCharts/LineChart/Helpers/LinePath.swift comparison

Add source code

author	Dennis Concepción Martín <66180929+denniscm190@users.noreply.github.com>
date	Mon, 26 Apr 2021 19:02:46 +0200
parents
children	959175ee5ebd

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-:fd3fb56afc53
+:f828c7c408d4
+//
+//  LinePath.swift
+//  InteractiveCharts
+//
+//  Created by Dennis Concepción Martín on 26/4/21.
+//
+import SwiftUI
+struct LinePath: Shape {
+var data: [Double]
+var (width, height): (CGFloat, CGFloat)
+func path(in rect: CGRect) -> Path {
+var path = Path()
+let normalizedData = normalize(data)
+let widthBetweenDataPoints = Double(width) / Double(normalizedData.count - 1)  // Remove first point
+let initialPoint = normalizedData[0] * Double(height)
+var x: Double = 0
+var pathPoints = [CGPoint]()
+path.move(to: CGPoint(x: x, y: initialPoint))
+for y in normalizedData {
+if normalizedData.firstIndex(of: y) != 0 {  // Skip first point
+x += widthBetweenDataPoints
+let y = y * Double(height)
+path.addLine(to: CGPoint(x: x, y: y))
+}
+// Append current point to an array. Later will be used for Drag Gesture
+pathPoints.append(path.currentPoint!)
+}
+return path
+}
+/*
+Get data -> normalize it -> 0 <= output <= 1
+*/
+func normalize(_ data: [Double]) -> [Double] {
+var normalData = [Double]()
+let min = data.min()!
+let max = data.max()!
+for value in data {
+let normal = (value - min) / (max - min)
+normalData.append(normal)
+}
+return normalData
+}
+}

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