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

Changed Int to Double in quadCurvedPathWithPoints and quadClosedCurvedPathWithPoints.

.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
@@ -11,9 +11,9 @@ It supports:
 
 ### Installation:
 
-It requires iOS 13 and xCode 11!
+It requires iOS 13 and Xcode 11!
 
-In xCode got to `File -> Swift Packages -> Add Package Dependency` and paste inthe repo's url: `https://github.com/AppPear/ChartView`
+In Xcode got to `File -> Swift Packages -> Add Package Dependency` and paste inthe repo's url: `https://github.com/AppPear/ChartView`
 
 ### Usage:
 
@@ -29,7 +29,7 @@ Added an example project, with **iOS, watchOS** target: https://github.com/AppPe
 
 **New full screen view called LineView!!!**
 
-![Line Charts](./fullscreen1.gif "Line Charts")![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()
@@ -37,7 +37,7 @@ Added an example project, with **iOS, watchOS** target: https://github.com/AppPe
 
 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
 ```
 
-You can add different formats: 
-* Small `Form.small`
-* Medium  `Form.medium`
-* Large `Form.large` 
+**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: 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")` 
+
 
- ```swift
- BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", form: Form.small)
- ```
  **Turn drop shadow off by adding to the Initialiser: `dropShadow: false`**
 
  ### You can customize styling of the chart with a ChartStyle object: 
@@ -81,7 +112,7 @@ Customizable:
 * legend text color
 
 ```swift
- let chartStyle = ChartStyle(backgroundColor: Color.black, accentColor: Colors.OrangeStart, secondGradientColor: Colors.OrangeEnd, chartFormSize: Form.medium, textColor: Color.white, legendTextColor: Color.white )
+ let chartStyle = ChartStyle(backgroundColor: Color.black, accentColor: Colors.OrangeStart, secondGradientColor: Colors.OrangeEnd, chartFormSize: ChartForm.medium, textColor: Color.white, legendTextColor: Color.white )
  ...
  BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", style: chartStyle)
 ```
@@ -98,29 +129,29 @@ 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 Form object: 
+### You can customize the size of the chart with a ChartForm object: 
 
-**Form**
+**ChartForm**
 * `.small`
 * `.medium`
 * `.large`
 * `.detail`
 
 ```swift
-BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", form: Form.small)
+BarChartView(data: [8,23,54,32,12,37,7,23,43], title: "Title", form: ChartForm.small)
 ```
 
 ### 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/BarChartRow.swift

@@ -9,10 +9,10 @@
 import SwiftUI
 
 public struct BarChartRow : View {
-    var data: [Int]
+    var data: [Double]
     var accentColor: Color
     var secondGradientAccentColor: Color?
-    var maxValue: Int {
+    var maxValue: Double {
         data.max() ?? 0
     }
     @Binding var touchLocation: CGFloat
@@ -22,6 +22,7 @@ public struct BarChartRow : View {
                 ForEach(0..<self.data.count) { i in
                     BarChartCell(value: self.normalizedValue(index: i), index: i, width: Float(geometry.frame(in: .local).width - 22), numberOfDataPoints: self.data.count, accentColor: self.accentColor, secondGradientAccentColor: self.secondGradientAccentColor, touchLocation: self.$touchLocation)
                         .scaleEffect(self.touchLocation > CGFloat(i)/CGFloat(self.data.count) && self.touchLocation < CGFloat(i+1)/CGFloat(self.data.count) ? CGSize(width: 1.4, height: 1.1) : CGSize(width: 1, height: 1), anchor: .bottom)
+                        .animation(.spring())
                     
                 }
             }

Sources/SwiftUICharts/BarChart/BarChartView.swift

@@ -9,35 +9,37 @@
 import SwiftUI
 
 public struct BarChartView : View {
-    public var data: [Int]
+    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 currentValue: Int = 0 {
+    @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 == Form.large
+        return self.formSize == ChartForm.large
     }
-    public init(data: [Int], title: String, legend: String? = nil, style: ChartStyle = Styles.barChartStyleOrangeLight, form: CGSize? = Form.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 {
@@ -53,11 +55,11 @@ 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)
                     }
-                    if(self.formSize == Form.large && self.legend != nil && !showValue) {
+                    if(self.formSize == ChartForm.large && self.legend != nil && !showValue) {
                         Text(self.legend!)
                             .font(.callout)
                             .foregroundColor(self.style.accentColor)
@@ -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 == Form.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)
                 }
                 
             }
@@ -83,10 +87,14 @@ 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
                 })
         )
@@ -94,16 +102,31 @@ public struct BarChartView : View {
         )
     }
     
-    func getCurrentValue()-> Int{
-        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..
 //
@@ -88,7 +88,7 @@ public struct Styles {
         legendTextColor: Color.gray)
 }
 
-public struct Form {
+public struct ChartForm {
     #if os(watchOS)
     public static let small = CGSize(width:120, height:90)
     public static let medium = CGSize(width:120, height:160)
@@ -128,17 +128,43 @@ public struct ChartStyle {
     }
 }
 
-class ChartData: ObservableObject {
-    @Published var points: [Int] = [Int]()
-    @Published var currentPoint: Int? = 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:[Int]) {
-        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

@@ -13,23 +13,40 @@ struct Legend: View {
     @Binding var frame: CGRect
     @Binding var hideHorizontalLines: Bool
     @Environment(\.colorScheme) var colorScheme: ColorScheme
+    let padding:CGFloat = 3
 
     var stepWidth: CGFloat {
+        if data.points.count < 2 {
+            return 0
+        }
         return frame.size.width / CGFloat(data.points.count-1)
     }
     var stepHeight: CGFloat {
-        return frame.size.height / CGFloat(data.points.max()! + data.points.min()!)
+        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{
+                return (frame.size.height-padding) / CGFloat(max + min)
+            }
+        }
+        return 0
+    }
+    
+    var min: CGFloat {
+        let points = self.data.onlyPoints()
+        return CGFloat(points.min() ?? 0)
     }
     
     var body: some View {
         ZStack(alignment: .topLeading){
             ForEach((0...4), id: \.self) { height in
                 HStack(alignment: .center){
-                    Text("\(self.getYLegend()![height])").offset(x: 0, y: (self.frame.height-CGFloat(self.getYLegend()![height])*self.stepHeight)-(self.frame.height/2))
+                    Text("\(self.getYLegendSafe(height: height), specifier: "%.2f")").offset(x: 0, y: self.getYposition(height: height) )
                         .foregroundColor(Colors.LegendText)
                         .font(.caption)
-                     self.line(atHeight: CGFloat(self.getYLegend()![height]), width: self.frame.width)
-                        .stroke(colorScheme == .dark ? Colors.LegendDarkColor : Colors.LegendColor, style: StrokeStyle(lineWidth: 1.5, lineCap: .round, dash: [5,height == 0 ? 0 : 10]))
+                    self.line(atHeight: self.getYLegendSafe(height: height), width: self.frame.width)
+                        .stroke(self.colorScheme == .dark ? Colors.LegendDarkColor : Colors.LegendColor, style: StrokeStyle(lineWidth: 1.5, lineCap: .round, dash: [5,height == 0 ? 0 : 10]))
                         .opacity((self.hideHorizontalLines && height != 0) ? 0 : 1)
                         .rotationEffect(.degrees(180), anchor: .center)
                         .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
@@ -42,30 +59,41 @@ struct Legend: View {
         }
     }
     
+    func getYLegendSafe(height:Int)->CGFloat{
+        if let legend = getYLegend() {
+            return CGFloat(legend[height])
+        }
+        return 0
+    }
+    
+    func getYposition(height: Int)-> CGFloat {
+        if let legend = getYLegend() {
+            return (self.frame.height-((CGFloat(legend[height]) - min)*self.stepHeight))-(self.frame.height/2)
+        }
+        return 0
+       
+    }
+    
     func line(atHeight: CGFloat, width: CGFloat) -> Path {
         var hLine = Path()
-        hLine.move(to: CGPoint(x:5, y: atHeight*stepHeight))
-        hLine.addLine(to: CGPoint(x: width, y: atHeight*stepHeight))
+        hLine.move(to: CGPoint(x:5, y: (atHeight-min)*stepHeight))
+        hLine.addLine(to: CGPoint(x: width, y: (atHeight-min)*stepHeight))
         return hLine
     }
     
-    func getYLegend() -> [Int]? {
-        guard let max = data.points.max() else { return nil }
-        guard let min = data.points.min() else { return nil }
-        if(min > 0){
-            let upperBound = ((max/10)+1) * 10
-            let step = upperBound/4
-            return [step * 0,step * 1, step * 2, step * 3, step * 4]
-        }
-        
-        return nil
+    func getYLegend() -> [Double]? {
+        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]
     }
 }
 
 struct Legend_Previews: PreviewProvider {
     static var previews: some View {
         GeometryReader{ geometry in
-            Legend(data: TestData.data, frame: .constant(geometry.frame(in: .local)), hideHorizontalLines: .constant(false))
+            Legend(data: ChartData(points: [0.2,0.4,1.4,4.5]), frame: .constant(geometry.frame(in: .local)), hideHorizontalLines: .constant(false))
         }.frame(width: 320, height: 200)
     }
 }

Sources/SwiftUICharts/LineChart/Line.swift

@@ -15,18 +15,31 @@ struct Line: View {
     @Binding var showIndicator: Bool
     @State private var showFull: Bool = false
     @State var showBackground: Bool = true
-    
+    let padding:CGFloat = 30
     var stepWidth: CGFloat {
+        if data.points.count < 2 {
+            return 0
+        }
         return frame.size.width / CGFloat(data.points.count-1)
     }
     var stepHeight: CGFloat {
-        return frame.size.height / CGFloat(data.points.max()! + data.points.min()!)
+        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(points.max()! - points.min()!)
+            }else{
+                return (frame.size.height-padding) / CGFloat(points.max()! + points.min()!)
+            }
+        }
+        return 0
     }
     var path: Path {
-        return Path.quadCurvedPathWithPoints(points: data.points, step: CGPoint(x: stepWidth, y: stepHeight))
+        let points = self.data.onlyPoints()
+        return Path.quadCurvedPathWithPoints(points: points, step: CGPoint(x: stepWidth, y: stepHeight))
     }
     var closedPath: Path {
-        return Path.quadClosedCurvedPathWithPoints(points: data.points, step: CGPoint(x: stepWidth, y: stepHeight))
+        let points = self.data.onlyPoints()
+        return Path.quadClosedCurvedPathWithPoints(points: points, step: CGPoint(x: stepWidth, y: stepHeight))
     }
     
     var body: some View {
@@ -67,24 +80,24 @@ struct Line: View {
 
 extension CGPoint {
     static func getMidPoint(point1: CGPoint, point2: CGPoint) -> CGPoint {
-      return CGPoint(
-        x: point1.x + (point2.x - point1.x) / 2,
-        y: point1.y + (point2.y - point1.y) / 2
-      )
+        return CGPoint(
+            x: point1.x + (point2.x - point1.x) / 2,
+            y: point1.y + (point2.y - point1.y) / 2
+        )
     }
     
     func dist(to: CGPoint) -> CGFloat {
-      return sqrt((pow(self.x - to.x, 2) + pow(self.y - to.y, 2)))
+        return sqrt((pow(self.x - to.x, 2) + pow(self.y - to.y, 2)))
     }
     
     static func midPointForPoints(p1:CGPoint, p2:CGPoint) -> CGPoint {
         return CGPoint(x:(p1.x + p2.x) / 2,y: (p1.y + p2.y) / 2)
     }
-
+    
     static func controlPointForPoints(p1:CGPoint, p2:CGPoint) -> CGPoint {
         var controlPoint = CGPoint.midPointForPoints(p1:p1, p2:p2)
         let diffY = abs(p2.y - controlPoint.y)
-
+        
         if (p1.y < p2.y){
             controlPoint.y += diffY
         } else if (p1.y > p2.y) {
@@ -94,16 +107,17 @@ extension CGPoint {
     }
 }
 extension Path {
-    static func quadCurvedPathWithPoints(points:[Int], step:CGPoint) -> Path {
+    static func quadCurvedPathWithPoints(points:[Double], step:CGPoint) -> Path {
         var path = Path()
-        var p1 = CGPoint(x: 0, y: CGFloat(points[0])*step.y)
-        path.move(to: p1)
-        if(points.count < 2){
-            path.addLine(to: CGPoint(x: step.x, y: step.y*CGFloat(points[1])))
+        if (points.count < 2){
             return path
         }
+        guard var offset = points.min() else { return path }
+        offset -= 3
+        var p1 = CGPoint(x: 0, y: CGFloat(points[0]-offset)*step.y)
+        path.move(to: p1)
         for pointIndex in 1..<points.count {
-            let p2 = CGPoint(x: step.x * CGFloat(pointIndex), y: step.y*CGFloat(points[pointIndex]))
+            let p2 = CGPoint(x: step.x * CGFloat(pointIndex), y: step.y*CGFloat(points[pointIndex]-offset))
             let midPoint = CGPoint.midPointForPoints(p1: p1, p2: p2)
             path.addQuadCurve(to: midPoint, control: CGPoint.controlPointForPoints(p1: midPoint, p2: p1))
             path.addQuadCurve(to: p2, control: CGPoint.controlPointForPoints(p1: midPoint, p2: p2))
@@ -112,17 +126,18 @@ extension Path {
         return path
     }
     
-    static func quadClosedCurvedPathWithPoints(points:[Int], step:CGPoint) -> Path {
+    static func quadClosedCurvedPathWithPoints(points:[Double], step:CGPoint) -> Path {
         var path = Path()
-        path.move(to: .zero)
-        var p1 = CGPoint(x: 0, y: CGFloat(points[0])*step.y)
-        path.addLine(to: p1)
-        if(points.count < 2){
-            path.addLine(to: CGPoint(x: step.x, y: step.y*CGFloat(points[1])))
+        if (points.count < 2){
             return path
         }
+        guard var offset = points.min() else { return path }
+        offset -= 3
+        path.move(to: .zero)
+        var p1 = CGPoint(x: 0, y: CGFloat(points[0]-offset)*step.y)
+        path.addLine(to: p1)
         for pointIndex in 1..<points.count {
-            let p2 = CGPoint(x: step.x * CGFloat(pointIndex), y: step.y*CGFloat(points[pointIndex]))
+            let p2 = CGPoint(x: step.x * CGFloat(pointIndex), y: step.y*CGFloat(points[pointIndex]-offset))
             let midPoint = CGPoint.midPointForPoints(p1: p1, p2: p2)
             path.addQuadCurve(to: midPoint, control: CGPoint.controlPointForPoints(p1: midPoint, p2: p1))
             path.addQuadCurve(to: p2, control: CGPoint.controlPointForPoints(p1: midPoint, p2: p2))
@@ -153,7 +168,7 @@ extension Path {
 struct Line_Previews: PreviewProvider {
     static var previews: some View {
         GeometryReader{ geometry in
-            Line(data: TestData.data, frame: .constant(geometry.frame(in: .local)), touchLocation: .constant(CGPoint(x: 300, y: 12)), showIndicator: .constant(true))
+            Line(data: ChartData(points: [12,-230,10,54]), frame: .constant(geometry.frame(in: .local)), touchLocation: .constant(CGPoint(x: 100, y: 12)), showIndicator: .constant(true))
         }.frame(width: 320, height: 160)
     }
 }

Sources/SwiftUICharts/LineChart/LineChartView.swift

@@ -16,10 +16,11 @@ public struct LineChartView: View {
     public var style: ChartStyle
     public var formSize:CGSize
     public var dropShadow: Bool
+    public var valueSpecifier:String
 
     @State private var touchLocation:CGPoint = .zero
     @State private var showIndicatorDot: Bool = false
-    @State private var currentValue: Int = 2 {
+    @State private var currentValue: Double = 2 {
         didSet{
             if (oldValue != self.currentValue && showIndicatorDot) {
 //                selectionFeedbackGenerator.selectionChanged()
@@ -31,7 +32,7 @@ public struct LineChartView: View {
     let frame = CGSize(width: 180, height: 120)
     private var rateValue: Int
     
-    public init(data: [Int], title: String, legend: String? = nil, style: ChartStyle = Styles.lineChartStyleOne, form: CGSize? = Form.medium ,rateValue: Int? = 14, dropShadow: Bool? = true){
+    public init(data: [Double], title: String, legend: String? = nil, style: ChartStyle = Styles.lineChartStyleOne, form: CGSize? = ChartForm.medium ,rateValue: Int? = 14, dropShadow: Bool? = true, valueSpecifier: String? = "%.1f"){
         self.data = ChartData(points: data)
         self.title = title
         self.legend = legend
@@ -39,6 +40,7 @@ public struct LineChartView: View {
         self.formSize = form!
         self.rateValue = rateValue!
         self.dropShadow = dropShadow!
+        self.valueSpecifier = valueSpecifier!
     }
     
     public var body: some View {
@@ -66,20 +68,20 @@ public struct LineChartView: View {
                 }else{
                     HStack{
                         Spacer()
-                        Text("\(self.currentValue)")
+                        Text("\(self.currentValue, specifier: self.valueSpecifier)")
                             .font(.system(size: 41, weight: .bold, design: .default))
                             .offset(x: 0, y: 30)
                         Spacer()
                     }
                     .transition(.scale)
-                    .animation(.spring())
+//                    .animation(.spring())
                     
                 }
                 Spacer()
                 GeometryReader{ geometry in
                     Line(data: self.data, frame: .constant(geometry.frame(in: .local)), touchLocation: self.$touchLocation, showIndicator: self.$showIndicatorDot)
                 }
-                .frame(width: frame.width, height: frame.height)
+                .frame(width: frame.width, height: frame.height + 30)
                 .clipShape(RoundedRectangle(cornerRadius: 20))
                 .offset(x: 0, y: 0)
             }.frame(width: self.formSize.width, height: self.formSize.height)
@@ -96,14 +98,15 @@ public struct LineChartView: View {
         )
     }
     
-    func getClosestDataPoint(toPoint: CGPoint, width:CGFloat, height: CGFloat) -> CGPoint {
-        let stepWidth: CGFloat = width / CGFloat(data.points.count-1)
-        let stepHeight: CGFloat = height / CGFloat(data.points.max()! + data.points.min()!)
+    @discardableResult func getClosestDataPoint(toPoint: CGPoint, width:CGFloat, height: CGFloat) -> CGPoint {
+        let points = self.data.onlyPoints()
+        let stepWidth: CGFloat = width / CGFloat(points.count-1)
+        let stepHeight: CGFloat = height / CGFloat(points.max()! + points.min()!)
         
         let index:Int = Int(round((toPoint.x)/stepWidth))
-        if (index >= 0 && index < data.points.count){
-            self.currentValue = self.data.points[index]
-            return CGPoint(x: CGFloat(index)*stepWidth, y: CGFloat(self.data.points[index])*stepHeight)
+        if (index >= 0 && index < points.count){
+            self.currentValue = points[index]
+            return CGPoint(x: CGFloat(index)*stepWidth, y: CGFloat(points[index])*stepHeight)
         }
         return .zero
     }

Sources/SwiftUICharts/LineChart/LineView.swift

@@ -13,21 +13,23 @@ public struct LineView: View {
     public var title: String?
     public var legend: String?
     public var style: ChartStyle
-    
+    public var valueSpecifier:String
+
     @Environment(\.colorScheme) var colorScheme: ColorScheme
     @State private var showLegend = false
     @State private var dragLocation:CGPoint = .zero
     @State private var indicatorLocation:CGPoint = .zero
     @State private var closestPoint: CGPoint = .zero
     @State private var opacity:Double = 0
-    @State private var currentDataNumber: Int = 0
+    @State private var currentDataNumber: Double = 0
     @State private var hideHorizontalLines: Bool = false
     
-    public init(data: [Int], title: String? = nil, legend: String? = nil, style: ChartStyle? = Styles.lineChartStyleOne){
+    public init(data: [Double], title: String? = nil, legend: String? = nil, style: ChartStyle? = Styles.lineChartStyleOne, valueSpecifier: String? = "%.1f"){
         self.data = ChartData(points: data)
         self.title = title
         self.legend = legend
         self.style = style!
+        self.valueSpecifier = valueSpecifier!
     }
     
    public var body: some View {
@@ -54,7 +56,7 @@ public struct LineView: View {
                                 self.showLegend.toggle()
                             }
                     }.frame(width: geometry.frame(in: .local).size.width, height: 240).offset(x: 0, y: 40 )
-                    MagnifierRect(currentNumber: self.$currentDataNumber)
+                    MagnifierRect(currentNumber: self.$currentDataNumber, valueSpecifier: self.valueSpecifier)
                         .opacity(self.opacity)
                         .offset(x: self.dragLocation.x - geometry.frame(in: .local).size.width/2, y: 36)
                 }
@@ -77,13 +79,14 @@ public struct LineView: View {
     }
     
     func getClosestDataPoint(toPoint: CGPoint, width:CGFloat, height: CGFloat) -> CGPoint {
-        let stepWidth: CGFloat = width / CGFloat(data.points.count-1)
-        let stepHeight: CGFloat = height / CGFloat(data.points.max()! + data.points.min()!)
+        let points = self.data.onlyPoints()
+        let stepWidth: CGFloat = width / CGFloat(points.count-1)
+        let stepHeight: CGFloat = height / CGFloat(points.max()! + points.min()!)
 
         let index:Int = Int(floor((toPoint.x-15)/stepWidth))
-        if (index >= 0 && index < data.points.count){
-            self.currentDataNumber = self.data.points[index]
-            return CGPoint(x: CGFloat(index)*stepWidth, y: CGFloat(self.data.points[index])*stepHeight)
+        if (index >= 0 && index < points.count){
+            self.currentDataNumber = points[index]
+            return CGPoint(x: CGFloat(index)*stepWidth, y: CGFloat(points[index])*stepHeight)
         }
         return .zero
     }
@@ -104,14 +107,15 @@ struct IndicatorCircle: View {
 }
 
 struct MagnifierRect: View {
-    @Binding var currentNumber:Int
+    @Binding var currentNumber: Double
+    var valueSpecifier:String
     @Environment(\.colorScheme) var colorScheme: ColorScheme
     var body: some View {
         ZStack{
-            Text("\(self.currentNumber)")
+            Text("\(self.currentNumber, specifier: valueSpecifier)")
                 .font(.system(size: 18, weight: .bold))
                 .offset(x: 0, y:-110)
-                .animation(.spring())
+//                .animation(.spring())
                 .foregroundColor(self.colorScheme == .dark ? Color.white : Color.black)
             if (self.colorScheme == .dark ){
                  RoundedRectangle(cornerRadius: 16)
@@ -127,6 +131,6 @@ struct MagnifierRect: View {
             }
            
 
-        }.animation(.linear)
+        }//.animation(.linear)
     }
 }

Sources/SwiftUICharts/PieChart/PieChartCell.swift

@@ -12,7 +12,7 @@ struct PieSlice: Identifiable {
     var id = UUID()
     var startDeg: Double
     var endDeg: Double
-    var value: Int
+    var value: Double
     var normalizedValue: Double
 }
 

Sources/SwiftUICharts/PieChart/PieChartRow.swift

@@ -9,7 +9,7 @@
 import SwiftUI
 
 public struct PieChartRow : View {
-    var data: [Int]
+    var data: [Double]
     var backgroundColor: Color
     var accentColor: Color
     var slices: [PieSlice] {

Sources/SwiftUICharts/PieChart/PieChartView.swift

@@ -9,14 +9,14 @@
 import SwiftUI
 
 public struct PieChartView : View {
-    public var data: [Int]
+    public var data: [Double]
     public var title: String
     public var legend: String?
     public var style: ChartStyle
     public var formSize:CGSize
     public var dropShadow: Bool
 
-    public init(data: [Int], title: String, legend: String? = nil, style: ChartStyle = Styles.pieChartStyleOne, form: CGSize? = Form.medium, dropShadow: Bool? = true ){
+    public init(data: [Double], title: String, legend: String? = nil, style: ChartStyle = Styles.pieChartStyleOne, form: CGSize? = ChartForm.medium, dropShadow: Bool? = true ){
         self.data = data
         self.title = title
         self.legend = legend