update glucose color for live activity; author: bastiaanv

Author: marionbarker

Loop Widget Extension/Live Activity/ChartView.swift

@@ -17,6 +17,7 @@ struct ChartView: View {
     private let glucoseRanges: [GlucoseRangeValue]
     private let preset: Preset?
     private let yAxisMarks: [Double]
+    private let colorGradient: LinearGradient
 
     init(glucoseSamples: [GlucoseSampleAttributes], predicatedGlucose: [Double], predicatedStartDate: Date?, predicatedInterval: TimeInterval?, useLimits: Bool, lowerLimit: Double, upperLimit: Double, glucoseRanges: [GlucoseRangeValue], preset: Preset?, yAxisMarks: [Double]) {
         self.glucoseSampleData = ChartValues.convert(data: glucoseSamples, useLimits: useLimits, lowerLimit: lowerLimit, upperLimit: upperLimit)
@@ -28,6 +29,7 @@ struct ChartView: View {
             lowerLimit: lowerLimit,
             upperLimit: upperLimit
         )
+        self.colorGradient = ChartView.getGradient(useLimits: useLimits, lowerLimit: lowerLimit, upperLimit: upperLimit, highestValue: yAxisMarks.max() ?? 1)
         self.preset = preset
         self.glucoseRanges = glucoseRanges
         self.yAxisMarks = yAxisMarks
@@ -39,6 +41,28 @@ struct ChartView: View {
         self.preset = preset
         self.glucoseRanges = glucoseRanges
         self.yAxisMarks = yAxisMarks
+        self.colorGradient = ChartView.getGradient(useLimits: useLimits, lowerLimit: lowerLimit, upperLimit: upperLimit, highestValue: yAxisMarks.max() ?? 1)
+    }
+
+    private static func getGradient(useLimits: Bool, lowerLimit: Double, upperLimit: Double, highestValue: Double) -> LinearGradient {
+        var stops: [Gradient.Stop] = [Gradient.Stop(color: Color("glucose"), location: 0)]
+        if useLimits {
+            let lowerStop = lowerLimit / highestValue
+            let upperStop = upperLimit / highestValue
+            stops = [
+                Gradient.Stop(color: .red, location: 0),
+                Gradient.Stop(color: .red, location: lowerStop - 0.01),
+                Gradient.Stop(color: .green, location: lowerStop),
+                Gradient.Stop(color: .green, location: upperStop),
+                Gradient.Stop(color: .orange, location: upperStop + 0.01),
+                Gradient.Stop(color: .orange, location: 600), // Just use the mg/dl limit for the most upper value
+            ]
+        }
+        return LinearGradient(
+            gradient: Gradient(stops: stops),
+            startPoint: .bottom,
+            endPoint: .top
+        )
     }
 
     var body: some View {
@@ -79,7 +103,7 @@ struct ChartView: View {
                               y: .value("Glucose level", item.y)
                     )
                     .lineStyle(StrokeStyle(lineWidth: 2, dash: [6, 5]))
-                    .foregroundStyle(by: .value("Color", item.color))
+                    .foregroundStyle(colorGradient)
                 }
             }
             .chartForegroundStyleScale([
@@ -144,7 +168,7 @@ struct ChartValues: Identifiable {
             return ChartValues(
                 x: startDate.addingTimeInterval(interval * Double(index)),
                 y: item,
-                color: !useLimits ? "Default" : item < lowerLimit ? "Low" : item > upperLimit ? "High" : "Good"
+                color: "Default" // Color is handled by the gradient
             )
         }
     }