Bug Fix: Bar Chart with [0] crashed (#110)

Sources/SwiftUICharts/Charts/BarChart/BarChart.swift

@@ -10,6 +10,9 @@ public struct BarChart: ChartType {
 struct BarChart_Previews: PreviewProvider {
     static var previews: some View {
         Group {
+            BarChart().makeChart(
+            configuration: .init(data: [0]),
+            style: .init(backgroundColor: .white, foregroundColor: ColorGradient.redBlack))
             Group {
                 BarChart().makeChart(
                     configuration: .init(data: [1, 2, 3, 5, 1]),

Sources/SwiftUICharts/Charts/BarChart/BarChartCell.swift

@@ -31,6 +31,7 @@ public struct BarChartCell: View {
 struct BarChartCell_Previews: PreviewProvider {
     static var previews: some View {
         Group {
+            BarChartCell(value: 0, width: 50, numberOfDataPoints: 1, gradientColor: ColorGradient.greenRed, touchLocation: .constant(CGFloat()))
             Group {
                 BarChartCell(value: 1, width: 50, numberOfDataPoints: 1, gradientColor: ColorGradient.greenRed, touchLocation: .constant(CGFloat()))
                 BarChartCell(value: 1, width: 50, numberOfDataPoints: 1, gradientColor: ColorGradient.whiteBlack, touchLocation: .constant(CGFloat()))

Sources/SwiftUICharts/Charts/BarChart/BarChartRow.swift

@@ -11,7 +11,10 @@ public struct BarChartRow: View {
     var style: ChartStyle
     
     var maxValue: Double {
-        data.max() ?? 0
+        guard let max = data.max() else {
+            return 1
+        }
+        return max != 0 ? max : 1
     }
 
     public var body: some View {
@@ -59,6 +62,7 @@ public struct BarChartRow: View {
 struct BarChartRow_Previews: PreviewProvider {
     static var previews: some View {
         Group {
+            BarChartRow(data: [0], style: styleGreenRed)
             Group {
                 BarChartRow(data: [1, 2, 3], style: styleGreenRed)
                 BarChartRow(data: [1, 2, 3], style: styleGreenRedWhiteBlack)

Sources/SwiftUICharts/Charts/LineChart/LineChart.swift

@@ -11,6 +11,9 @@ public struct LineChart: ChartType {
 struct LineChart_Previews: PreviewProvider {
     static var previews: some View {
         Group {
+            LineChart().makeChart(
+            configuration: .init(data: [0]),
+            style: .init(backgroundColor: .white, foregroundColor: ColorGradient(.black)))
             Group {
                 LineChart().makeChart(
                     configuration: .init(data: [1, 2, 3, 5, 1]),

Sources/SwiftUICharts/Charts/PieChart/PieChart.swift

@@ -17,6 +17,10 @@ public struct PieChart: ChartType {
 struct PieChart_Previews: PreviewProvider {
     static var previews: some View {
         Group {
+            PieChart().makeChart(
+                configuration: .init(data: [0]),
+            style: styleOneColor)
+            
             Group {
                 PieChart().makeChart(
                     configuration: .init(data: [56, 78, 53, 65, 54]),

Sources/SwiftUICharts/Charts/PieChart/PieChartCell.swift

@@ -12,7 +12,6 @@ struct PieSlice: Identifiable {
     var startDeg: Double
     var endDeg: Double
     var value: Double
-    //var normalizedValue: Double
 }
 
 public struct PieChartCell: View {
@@ -47,7 +46,7 @@ public struct PieChartCell: View {
         Group {
             path
                 .fill(self.accentColor.linearGradient(from: .bottom, to: .top))
-                .overlay(path.stroke(self.backgroundColor, lineWidth: 2))
+                .overlay(path.stroke(self.backgroundColor, lineWidth: (startDeg == 0 && endDeg == 0 ? 0 : 2)))
                 .scaleEffect(self.show ? 1 : 0)
                 .animation(Animation.spring().delay(Double(self.index) * 0.04))
                 .onAppear {
@@ -97,6 +96,16 @@ struct PieChartCell_Previews: PreviewProvider {
                 rect: geometry.frame(in: .local),
                 startDeg: 185.0,
                 endDeg: 290.0,
+                index: 1,
+                backgroundColor: Color.purple,
+                accentColor: ColorGradient(.purple))
+            }.frame(width: 100, height: 100)
+            
+            GeometryReader { geometry in
+            PieChartCell(
+                rect: geometry.frame(in: .local),
+                startDeg: 0,
+                endDeg: 0,
                 index: 0,
                 backgroundColor: Color.purple,
                 accentColor: ColorGradient(.purple))

Sources/SwiftUICharts/Charts/PieChart/PieChartRow.swift

@@ -15,10 +15,10 @@ public struct PieChartRow: View {
     var slices: [PieSlice] {
         var tempSlices: [PieSlice] = []
         var lastEndDeg: Double = 0
-        let maxValue = data.reduce(0, +)
+        let maxValue: Double = data.reduce(0, +)
         
         for slice in data {
-            let normalized: Double = Double(slice)/Double(maxValue)
+            let normalized: Double = Double(slice) / (maxValue == 0 ? 1 : maxValue)
             let startDeg = lastEndDeg
             let endDeg = lastEndDeg + (normalized * 360)
             lastEndDeg = endDeg
@@ -55,12 +55,17 @@ struct PieChartRow_Previews: PreviewProvider {
             PieChartRow(
                 data: [8, 23, 32, 7, 23, 43],
                 style: defaultMultiColorChartStyle)
-                .frame(width: 100, height: 100)
+            .frame(width: 100, height: 100)
             
             PieChartRow(
                 data: [8, 23, 32, 7, 23, 43],
                 style: multiColorChartStyle)
-            .   frame(width: 100, height: 100)
+            .frame(width: 100, height: 100)
+            
+            PieChartRow(
+                data: [0],
+                style: multiColorChartStyle)
+            .frame(width: 100, height: 100)
             
         }.previewLayout(.fixed(width: 125, height: 125))