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// |
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// Measurements.swift |
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// USB Meter |
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// |
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// Created by Bogdan Timofte on 07/05/2020. |
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// Copyright © 2020 Bogdan Timofte. All rights reserved. |
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// |
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import Foundation |
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import CoreGraphics |
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class Measurements : ObservableObject {
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class Measurement : ObservableObject {
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struct Point : Identifiable , Hashable {
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var id : Int |
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var timestamp: Date |
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var value: Double |
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func point() -> CGPoint {
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return CGPoint(x: timestamp.timeIntervalSince1970, y: value) |
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} |
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} |
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var points: [Point] = [] |
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var context = ChartContext() |
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func removeValue(index: Int) {
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points.remove(at: index) |
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context.reset() |
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for point in points {
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context.include( point: point.point() ) |
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} |
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self.objectWillChange.send() |
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} |
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func addPoint(timestamp: Date, value: Double) {
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let newPoint = Measurement.Point(id: points.count, timestamp: timestamp, value: value) |
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points.append(newPoint) |
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context.include( point: newPoint.point() ) |
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self.objectWillChange.send() |
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} |
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func reset() {
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points.removeAll() |
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context.reset() |
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self.objectWillChange.send() |
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} |
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} |
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@Published var power = Measurement() |
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@Published var voltage = Measurement() |
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@Published var current = Measurement() |
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private var lastPointTimestamp = 0 |
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private var itemsInSum: Double = 0 |
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private var powerSum: Double = 0 |
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private var voltageSum: Double = 0 |
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private var currentSum: Double = 0 |
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func remove(at idx: Int) {
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power.removeValue(index: idx) |
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voltage.removeValue(index: idx) |
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current.removeValue(index: idx) |
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self.objectWillChange.send() |
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} |
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func addValues(timestamp: Date, power: Double, voltage: Double, current: Double) {
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let valuesTimestamp = timestamp.timeIntervalSinceReferenceDate.intValue |
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if lastPointTimestamp == 0 {
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lastPointTimestamp = valuesTimestamp |
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} |
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if lastPointTimestamp == valuesTimestamp {
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itemsInSum += 1 |
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powerSum += voltage |
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voltageSum += voltage |
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currentSum += current |
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} |
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else {
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self.power.addPoint( timestamp: timestamp, value: powerSum / itemsInSum ) |
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self.voltage.addPoint( timestamp: timestamp, value: voltageSum / itemsInSum ) |
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self.current.addPoint( timestamp: timestamp, value: currentSum / itemsInSum ) |
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lastPointTimestamp = valuesTimestamp |
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itemsInSum = 1 |
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powerSum = power |
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voltageSum = voltage |
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currentSum = current |
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} |
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self.objectWillChange.send() |
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} |
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} |