feat: add new axis interface

Sources/SwiftUICharts/Base/Chart/ChartData.swift

@@ -41,11 +41,19 @@ public class ChartData: ObservableObject {
     }
 
     var normalisedYRange: Double {
-        return rangeY == nil ? (normalisedPoints.max() ?? 0.0) - (normalisedPoints.min() ?? 0.0) : 1
+        if let _ = rangeY {
+            return 1
+        }
+
+        return (normalisedPoints.max() ?? 0.0) - (normalisedPoints.min() ?? 0.0)
     }
 
     var normalisedXRange: Double {
-        return rangeX == nil ? (normalisedValues.max() ?? 0.0) - (normalisedValues.min() ?? 0.0) : 1
+        if let _ = rangeX {
+            return 1
+        }
+
+        return (normalisedValues.max() ?? 0.0) - (normalisedValues.min() ?? 0.0)
     }
 
     var isInNegativeDomain: Bool {

Sources/SwiftUICharts/Base/Extensions/Path+QuadCurve.swift

@@ -201,7 +201,7 @@ extension Path {
         let convertedXValues = data.map { CGFloat($0.0) * rect.width }
         let convertedYPoints = data.map { CGFloat($0.1) * rect.height }
 
-        path.move(to: CGPoint(x: convertedXValues[0], y: 0))
+        path.move(to: .zero)
         var point1 = CGPoint(x: convertedXValues[0], y: convertedYPoints[0])
         path.addLine(to: point1)
         for pointIndex in 1..<data.count {

Sources/SwiftUICharts/Base/Extensions/View+Extension.swift

@@ -8,10 +8,4 @@ extension View {
     public func chartStyle(_ style: ChartStyle) -> some View {
         self.environmentObject(style)
     }
-
-    public func toStandardCoordinateSystem() -> some View {
-        self
-            .rotationEffect(.degrees(180), anchor: .center)
-            .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
-    }
 }

Sources/SwiftUICharts/Base/Grid/ChartGridShape.swift

@@ -17,11 +17,13 @@ struct ChartGridShape_Previews: PreviewProvider {
         Group {
             ChartGridShape(numberOfHorizontalLines: 5, numberOfVerticalLines: 0)
                 .stroke()
-                .toStandardCoordinateSystem()
+                .rotationEffect(.degrees(180), anchor: .center)
+                                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
 
             ChartGridShape(numberOfHorizontalLines: 4, numberOfVerticalLines: 4)
                 .stroke()
-                .toStandardCoordinateSystem()
+                .rotationEffect(.degrees(180), anchor: .center)
+                                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
         }
         .padding()
     }

Sources/SwiftUICharts/Charts/LineChart/Line.swift

@@ -43,7 +43,8 @@ public struct Line: View {
                     IndicatorPoint()
                         .position(self.getClosestPointOnPath(geometry: geometry,
                                                              touchLocation: self.touchLocation))
-                        .toStandardCoordinateSystem()
+                        .rotationEffect(.degrees(180), anchor: .center)
+                        .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
                 }
             }
             .onAppear {

Sources/SwiftUICharts/Charts/LineChart/LineBackgroundShape.swift

@@ -14,12 +14,14 @@ struct LineBackgroundShape_Previews: PreviewProvider {
             GeometryReader { geometry in
                 LineBackgroundShape(data: [(0, -0.5), (0.25, 0.8), (0.5,-0.6), (0.75,0.6), (1, 1)])
                     .fill(Color.red)
-                    .toStandardCoordinateSystem()
+                    .rotationEffect(.degrees(180), anchor: .center)
+                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
             }
             GeometryReader { geometry in
                 LineBackgroundShape(data: [(0, 0), (0.25, 0.5), (0.5,0.8), (0.75, 0.6), (1, 1)])
                     .fill(Color.blue)
-                    .toStandardCoordinateSystem()
+                    .rotationEffect(.degrees(180), anchor: .center)
+                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
             }
         }
     }

Sources/SwiftUICharts/Charts/LineChart/LineBackgroundShapeView.swift

@@ -11,6 +11,7 @@ struct LineBackgroundShapeView: View {
                                                              backgroundColor.endColor]),
                                  startPoint: .bottom,
                                  endPoint: .top))
-            .toStandardCoordinateSystem()
+            .rotationEffect(.degrees(180), anchor: .center)
+            .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
     }
 }

Sources/SwiftUICharts/Charts/LineChart/LineShape.swift

@@ -20,11 +20,13 @@ struct LineShape_Previews: PreviewProvider {
         Group {
             LineShape(data: [(0, 0), (0.25, 0.5), (0.5,0.8), (0.75, 0.6), (1, 1)])
                 .stroke()
-                .toStandardCoordinateSystem()
+                .rotationEffect(.degrees(180), anchor: .center)
+                                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
 
             LineShape(data: [(0, -0.5), (0.25, 0.8), (0.5,-0.6), (0.75,0.6), (1, 1)], lineStyle: .straight)
                 .stroke()
-                .toStandardCoordinateSystem()
+                .rotationEffect(.degrees(180), anchor: .center)
+                                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
         }
     }
 }

Sources/SwiftUICharts/Charts/LineChart/LineShapeView.swift

@@ -31,7 +31,8 @@ struct LineShapeView: View, Animatable {
                                        startPoint: .leading,
                                        endPoint: .trailing),
                         style: StrokeStyle(lineWidth: chartProperties.lineWidth, lineJoin: .round))
-                .toStandardCoordinateSystem()
+                .rotationEffect(.degrees(180), anchor: .center)
+                .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
                 .clipped()
             if chartProperties.showChartMarks {
                 MarkerShape(data: chartData.normalisedData)
@@ -39,7 +40,8 @@ struct LineShapeView: View, Animatable {
                     .fill(.white,
                           strokeBorder: chartMarkColor,
                           lineWidth: chartProperties.lineWidth)
-                    .toStandardCoordinateSystem()
+                    .rotationEffect(.degrees(180), anchor: .center)
+                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
             }
         }
     }

Sources/SwiftUICharts/Charts/LineChart/MarkerShape.swift

@@ -13,11 +13,13 @@ struct MarkerShape_Previews: PreviewProvider {
         Group {
             MarkerShape(data: [(0, 0), (0.25, 0.5), (0.5,0.8), (0.75, 0.6), (1, 1)])
                 .stroke()
-                .toStandardCoordinateSystem()
+                .rotationEffect(.degrees(180), anchor: .center)
+                                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
 
             MarkerShape(data: [(0, -0.5), (0.25, 0.8), (0.5,-0.6), (0.75,0.6), (1, 1)])
                 .stroke()
-                .toStandardCoordinateSystem()
+                .rotationEffect(.degrees(180), anchor: .center)
+                                    .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))
         }
     }
 }