Added Label,Value pairs so you can display a label for each point in …

…Bar chart, added ability to change ecg image in the corner, added Generic number types to ChartData initialiser

.swiftpm/xcode/xcuserdata/samuandris.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>SwiftUICharts.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>1</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>

README.md

@@ -2,7 +2,7 @@
 
 Swift package for displaying charts effortlessly.
 
-![SwiftUI Charts](./showcase1.gif "SwiftUI Charts")
+![SwiftUI Charts](./Resources/showcase1.gif "SwiftUI Charts")
 
 It supports:
 * Line charts
@@ -29,15 +29,15 @@ Added an example project, with **iOS, watchOS** target: https://github.com/AppPe
 
 **New full screen view called LineView!!!**
 
-![Line Charts](./fullscreen2.gif "Line Charts")
+![Line Charts](./Resources/fullscreen2.gif "Line Charts")
 
 ```swift
  LineView(data: [8,23,54,32,12,37,7,23,43], title: "Line chart", legend: "Full screen") // legend is optional, use optional .padding()
 ```
 
 Adopts to dark mode automatically 
 
-![Line Charts](./showcase3.gif "Line Charts")
+![Line Charts](./Resources/showcase3.gif "Line Charts")
 
 **Line chart is interactive, so you can drag across to reveal the data points**
 
@@ -51,24 +51,55 @@ You can add a line chart with the following code:
 
 
 ## Bar charts
-![Bar Charts](./showcase2.gif "Bar Charts")
+![Bar Charts](./Resources/showcase2.gif "Bar Charts")
 
+**[New feature] you can display labels also along values and points for each bar to descirbe your data better!**
 **Bar chart is interactive, so you can drag across to reveal the data points**
 
 You can add a bar chart with the following code: 
 
+Labels and points:
+
 ```swift
- BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", legend: "Legendary") // legend is optional
+ BarChartView(data: ChartData(values: [("2018 Q4",63150), ("2019 Q1",50900), ("2019 Q2",77550), ("2019 Q3",79600), ("2019 Q4",92550)]), title: "Sales", legend: "Quarterly") // legend is optional
 ```
+Only points:
+
+```swift
+ BarChartView(data: ChartData(points: [8,23,54,32,12,37,7,23,43]), title: "Title", legend: "Legendary") // legend is optional
+```
+
+**ChartData** structure
+Stores values in data pairs (actually tuple): `(String,Double)`
+* you can have duplicate values
+* keeps the data order
+
+You can initialise ChartData multiple ways:
+* For integer values: `ChartData(points: [8,23,54,32,12,37,7,23,43])`
+* For floating point values: `ChartData(points: [2.34,3.14,4.56])`
+* For label,value pairs: `ChartData(values: [("2018 Q4",63150), ("2019 Q1",50900)])`
+
 
 You can add different formats: 
 * Small `ChartForm.small`
 * Medium  `ChartForm.medium`
 * Large `ChartForm.large` 
 
- ```swift
- BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", form: ChartForm.small)
- ```
+```swift
+BarChartView(data: ChartData(points: [8,23,54,32,12,37,7,23,43]), title: "Title", form: ChartForm.small)
+```
+
+For floating point numbers, you can set a custom specifier: 
+
+```swift
+BarChartView(data: ChartData(points:[1.23,2.43,3.37]) ,title: "A", valueSpecifier: "%.2f")
+```
+For integers you can disable by passing: `valueSpecifier: "%.0f"`
+
+
+You can set your custom image in the upper right corner by passing in the initialiser: `cornerImage:Image(systemName: "waveform.path.ecg")` 
+
+
  **Turn drop shadow off by adding to the Initialiser: `dropShadow: false`**
 
  ### You can customize styling of the chart with a ChartStyle object: 
@@ -98,9 +129,9 @@ You can access built-in styles:
 * barChartMidnightGreenLight
 * barChartMidnightGreenDark
 
-![Midnightgreen](./midnightgreen.gif "Midnightgreen")
+![Midnightgreen](./Resources/midnightgreen.gif "Midnightgreen")
 
-![Custom Charts](./showcase5.png "Custom Charts")
+![Custom Charts](./Resources/showcase5.png "Custom Charts")
 
 
 ### You can customize the size of the chart with a ChartForm object: 
@@ -117,10 +148,10 @@ BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", form: ChartForm.s
 
 ### WatchOS support for Bar charts: 
 
-![Pie Charts](./watchos1.png "Pie Charts")
+![Pie Charts](./Resources/watchos1.png "Pie Charts")
 
 ## Pie charts
-![Pie Charts](./showcase4.png "Pie Charts")
+![Pie Charts](./Resources/showcase4.png "Pie Charts")
 
 You can add a line chart with the following code: 
 

Sources/SwiftUICharts/BarChart/BarChartView.swift

@@ -9,35 +9,37 @@
 import SwiftUI
 
 public struct BarChartView : View {
-    public var data: [Double]
+    private var data: ChartData
     public var title: String
     public var legend: String?
     public var style: ChartStyle
     public var formSize:CGSize
     public var dropShadow: Bool
-
-//    let selectionFeedbackGenerator = UISelectionFeedbackGenerator()
+    public var cornerImage: Image
+    public var valueSpecifier:String
 
     @State private var touchLocation: CGFloat = -1.0
     @State private var showValue: Bool = false
+    @State private var showLabelValue: Bool = false
     @State private var currentValue: Double = 0 {
         didSet{
             if(oldValue != self.currentValue && self.showValue) {
-//                selectionFeedbackGenerator.selectionChanged()
                 HapticFeedback.playSelection()
             }
         }
     }
     var isFullWidth:Bool {
         return self.formSize == ChartForm.large
     }
-    public init(data: [Double], title: String, legend: String? = nil, style: ChartStyle = Styles.barChartStyleOrangeLight, form: CGSize? = ChartForm.medium, dropShadow: Bool? = true){
+    public init(data:ChartData, title: String, legend: String? = nil, style: ChartStyle = Styles.barChartStyleOrangeLight, form: CGSize? = ChartForm.medium, dropShadow: Bool? = true, cornerImage:Image? = Image(systemName: "waveform.path.ecg"), valueSpecifier: String? = "%.1f"){
         self.data = data
         self.title = title
         self.legend = legend
         self.style = style
         self.formSize = form!
         self.dropShadow = dropShadow!
+        self.cornerImage = cornerImage!
+        self.valueSpecifier = valueSpecifier!
     }
 
     public var body: some View {
@@ -53,7 +55,7 @@ public struct BarChartView : View {
                             .font(.headline)
                             .foregroundColor(self.style.textColor)
                     }else{
-                        Text("\(self.currentValue)")
+                        Text("\(self.currentValue, specifier: self.valueSpecifier)")
                             .font(.headline)
                             .foregroundColor(self.style.textColor)
                     }
@@ -65,16 +67,18 @@ public struct BarChartView : View {
                             .animation(.easeOut)
                     }
                     Spacer()
-                    Image(systemName: "waveform.path.ecg")
+                    self.cornerImage
                         .imageScale(.large)
                         .foregroundColor(self.style.legendTextColor)
                 }.padding()
-                BarChartRow(data: data, accentColor: self.style.accentColor, secondGradientAccentColor: self.style.secondGradientColor, touchLocation: self.$touchLocation)
-                if self.legend != nil  && self.formSize == ChartForm.medium {
+                BarChartRow(data: data.points.map{$0.1}, accentColor: self.style.accentColor, secondGradientAccentColor: self.style.secondGradientColor, touchLocation: self.$touchLocation)
+                if self.legend != nil  && self.formSize == ChartForm.medium && !self.showLabelValue{
                     Text(self.legend!)
                         .font(.headline)
                         .foregroundColor(self.style.legendTextColor)
                         .padding()
+                }else if (self.data.valuesGiven) {
+                    LabelView(arrowOffset: self.getArrowOffset(touchLocation: self.touchLocation), title: .constant(self.getCurrentValue().0)).offset(x: self.getLabelViewOffset(touchLocation: self.touchLocation), y: -6)
                 }
 
             }
@@ -83,27 +87,46 @@ public struct BarChartView : View {
                 .onChanged({ value in
                     self.touchLocation = value.location.x/self.formSize.width
                     self.showValue = true
-                    self.currentValue = self.getCurrentValue()
+                    self.currentValue = self.getCurrentValue().1
+                    if(self.data.valuesGiven && self.formSize == ChartForm.medium) {
+                        self.showLabelValue = true
+                    }
                 })
                 .onEnded({ value in
                     self.showValue = false
+                    self.showLabelValue = false
                     self.touchLocation = -1
                 })
         )
             .gesture(TapGesture()
         )
     }
 
-    func getCurrentValue()-> Double {
-        let index = max(0,min(self.data.count-1,Int(floor((self.touchLocation*self.formSize.width)/(self.formSize.width/CGFloat(self.data.count))))))
-        return self.data[index]
+    func getArrowOffset(touchLocation:CGFloat) -> Binding<CGFloat> {
+        let realLoc = (self.touchLocation * self.formSize.width) - 50
+        if realLoc < 10 {
+            return .constant(realLoc - 10)
+        }else if realLoc > self.formSize.width-110 {
+            return .constant((self.formSize.width-110 - realLoc) * -1)
+        } else {
+            return .constant(0)
+        }
+    }
+
+    func getLabelViewOffset(touchLocation:CGFloat) -> CGFloat {
+        return min(self.formSize.width-110,max(10,(self.touchLocation * self.formSize.width) - 50))
+    }
+
+    func getCurrentValue()-> (String,Double) {
+        let index = max(0,min(self.data.points.count-1,Int(floor((self.touchLocation*self.formSize.width)/(self.formSize.width/CGFloat(self.data.points.count))))))
+        return self.data.points[index]
     }
 }
 
 #if DEBUG
 struct ChartView_Previews : PreviewProvider {
     static var previews: some View {
-        BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", legend: "Legendary")
+        BarChartView(data: TestData.values ,title: "Model 3 sales", legend: "Quarterly", valueSpecifier: "%.0f")
     }
 }
 #endif

Sources/SwiftUICharts/BarChart/LabelView.swift

@@ -0,0 +1,46 @@
+//
+//  LabelView.swift
+//  BarChart
+//
+//  Created by Samu András on 2020. 01. 08..
+//  Copyright © 2020. Samu András. All rights reserved.
+//
+
+import SwiftUI
+
+struct LabelView: View {
+    @Binding var arrowOffset: CGFloat
+    @Binding var title:String
+    var body: some View {
+        VStack{
+            ArrowUp().fill(Color.white).frame(width: 20, height: 12, alignment: .center).shadow(color: Color.gray, radius: 8, x: 0, y: 0).offset(x: getArrowOffset(offset:self.arrowOffset), y: 12)
+            ZStack{
+                RoundedRectangle(cornerRadius: 8).frame(width: 100, height: 32, alignment: .center).foregroundColor(Color.white).shadow(radius: 8)
+                Text(self.title).font(.caption).bold()
+                ArrowUp().fill(Color.white).frame(width: 20, height: 12, alignment: .center).zIndex(999).offset(x: getArrowOffset(offset:self.arrowOffset), y: -20)
+
+            }
+        }
+    }
+
+    func getArrowOffset(offset: CGFloat) -> CGFloat {
+        return max(-36,min(36, offset))
+    }
+}
+
+struct ArrowUp: Shape {
+    func path(in rect: CGRect) -> Path {
+        var path = Path()
+        path.move(to: CGPoint(x: 0, y: rect.height))
+        path.addLine(to: CGPoint(x: rect.width/2, y: 0))
+        path.addLine(to: CGPoint(x: rect.width, y: rect.height))
+        path.closeSubpath()
+        return path
+    }
+}
+
+struct LabelView_Previews: PreviewProvider {
+    static var previews: some View {
+        LabelView(arrowOffset: .constant(0), title: .constant("Tesla model 3"))
+    }
+}

Sources/SwiftUICharts/Helpers.swift

@@ -1,6 +1,6 @@
 //
 //  File.swift
-//  
+//
 //
 //  Created by András Samu on 2019. 07. 19..
 //
@@ -128,17 +128,43 @@ public struct ChartStyle {
     }
 }
 
-class ChartData: ObservableObject {
-    @Published var points: [Double] = [Double]()
-    @Published var currentPoint: Double? = nil
+public class ChartData: ObservableObject {
+    @Published var points: [(String,Double)] = [(String,Double)]()
+    var valuesGiven: Bool = false
+    public init<N: BinaryFloatingPoint>(points:[N]) {
+        self.points = points.map{("", Double($0))}
+    }
+    public init<N: BinaryInteger>(values:[(String,N)]){
+        self.points = values.map{($0.0, Double($0.1))}
+        self.valuesGiven = true
+    }
+    public init<N: BinaryFloatingPoint>(values:[(String,N)]){
+        self.points = values.map{($0.0, Double($0.1))}
+        self.valuesGiven = true
+    }
+    public init<N: BinaryInteger>(numberValues:[(N,N)]){
+        self.points = numberValues.map{(String($0.0), Double($0.1))}
+        self.valuesGiven = true
+    }
+    public init<N: BinaryFloatingPoint & LosslessStringConvertible>(numberValues:[(N,N)]){
+        self.points = numberValues.map{(String($0.0), Double($0.1))}
+        self.valuesGiven = true
+    }
 
-    init(points:[Double]) {
-        self.points = points
+    public func onlyPoints() -> [Double] {
+        return self.points.map{ $0.1 }
     }
 }
 
-class TestData{
+public class TestData{
     static public var data:ChartData = ChartData(points: [37,72,51,22,39,47,66,85,50])
+    static public var values:ChartData = ChartData(values: [("2017 Q3",220),
+    ("2017 Q4",1550),
+    ("2018 Q1",8180),
+    ("2018 Q2",18440),
+    ("2018 Q3",55840),
+    ("2018 Q4",63150), ("2019 Q1",50900), ("2019 Q2",77550), ("2019 Q3",79600), ("2019 Q4",92550)])
+
 }
 
 extension Color {

Sources/SwiftUICharts/LineChart/Legend.swift

@@ -22,7 +22,8 @@ struct Legend: View {
         return frame.size.width / CGFloat(data.points.count-1)
     }
     var stepHeight: CGFloat {
-        if let min = data.points.min(), let max = data.points.max(), min != max {
+        let points = self.data.onlyPoints()
+        if let min = points.min(), let max = points.max(), min != max {
             if (min < 0){
                 return (frame.size.height-padding) / CGFloat(max - min)
             }else{
@@ -33,7 +34,8 @@ struct Legend: View {
     }
 
     var min: CGFloat {
-        return CGFloat(data.points.min() ?? 0)
+        let points = self.data.onlyPoints()
+        return CGFloat(points.min() ?? 0)
     }
 
     var body: some View {
@@ -80,8 +82,9 @@ struct Legend: View {
     }
 
     func getYLegend() -> [Double]? {
-        guard let max = data.points.max() else { return nil }
-        guard let min = data.points.min() else { return nil }
+        let points = self.data.onlyPoints()
+        guard let max = points.max() else { return nil }
+        guard let min = points.min() else { return nil }
         let step = Double(max - min)/4
         return [min+step * 0, min+step * 1, min+step * 2, min+step * 3, min+step * 4]
     }