feat: add new axis interface

Sources/SwiftUICharts/Charts/LineChart/Extension/LineChart+Extension.swift

@@ -11,8 +11,9 @@ extension LineChart {
         return self
     }
 
-    public func showChartMarks(_ show: Bool) -> LineChart {
+    public func showChartMarks(_ show: Bool, with color: ColorGradient? = nil) -> LineChart {
         self.chartProperties.showChartMarks = show
+        self.chartProperties.customChartMarksColors = color
         return self
     }
 

Sources/SwiftUICharts/Charts/LineChart/LineShapeView.swift

@@ -13,6 +13,16 @@ struct LineShapeView: View, Animatable {
         set { trimTo = Double(newValue) }
     }
 
+    var chartMarkColor: LinearGradient {
+        if let customColor = chartProperties.customChartMarksColors {
+            return customColor.linearGradient(from: .leading, to: .trailing)
+        }
+
+        return LinearGradient(gradient: style.foregroundColor.first?.gradient ?? ColorGradient.orangeBright.gradient,
+                              startPoint: .leading,
+                              endPoint: .trailing)
+    }
+
     var body: some View {
         ZStack {
             LineShape(data: chartData.normalisedData, lineStyle: chartProperties.lineStyle)
@@ -28,9 +38,7 @@ struct LineShapeView: View, Animatable {
                 MarkerShape(data: chartData.normalisedData)
                     .trim(from: 0, to: CGFloat(trimTo))
                     .fill(.white,
-                          strokeBorder: LinearGradient(gradient: style.foregroundColor.first?.gradient ?? ColorGradient.orangeBright.gradient,
-                                                               startPoint: .leading,
-                                                               endPoint: .trailing),
+                          strokeBorder: chartMarkColor,
                           lineWidth: chartProperties.lineWidth)
                     .rotationEffect(.degrees(180), anchor: .center)
                     .rotation3DEffect(.degrees(180), axis: (x: 0, y: 1, z: 0))

Sources/SwiftUICharts/Charts/LineChart/Model/LineChartProperties.swift

@@ -4,6 +4,7 @@ public class LineChartProperties: ObservableObject {
     @Published var lineWidth: CGFloat = 2.0
     @Published var backgroundGradient: ColorGradient?
     @Published var showChartMarks: Bool = true
+    @Published var customChartMarksColors: ColorGradient?
     @Published var lineStyle: LineStyle = .curved
 
     public init() {