Create helper file for Dynamic BG Color functionality

- Added BGColor as a utility file
- BGColor contains functions for setting colors based on BG
- TODO: read a settings toggle to determine whether to use dynamic or static color

FreeAPS.xcodeproj/project.pbxproj

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+		11E79B132C5F2585007893C2 /* BGColor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 11E79B122C5F2585007893C2 /* BGColor.swift */; };
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 				CE7950242997D81700FA576E /* CGMSettingsView.swift in Sources */,
 				58237D9E2BCF0A6B00A47A79 /* PopupView.swift in Sources */,
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 				38D0B3D925EC07C400CB6E88 /* CarbsEntry.swift in Sources */,
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 				38FCF3D625E8FDF40078B0D1 /* MD5.swift in Sources */,
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FreeAPS/Sources/Helpers/BGColor.swift

@@ -0,0 +1,50 @@
+import SwiftUI
+
+// Helper function to decide how to pick the BG color
+public func setBGColor(bgValue: Int, lowGlucose: Int, highGlucose: Int, targetGlucose: Int) -> Color {
+    // TODO:
+    // Only use setDynamicBGColor if the setting is enabled in preferences
+    if true {
+        return setDynamicBGColor(bgValue: bgValue, lowGlucose: lowGlucose, highGlucose: highGlucose, targetGlucose: targetGlucose)
+    }
+    // Otheriwse, use static (orange = high, red = low, green = range)
+    else {
+        if bgValue > Int(highGlucose) {
+            return Color.orange
+        } else if bgValue < Int(lowGlucose) {
+            return Color.red
+        } else {
+            return Color.green
+        }
+    }
+}
+
+// Dynamic color - Define the hue values for the key points
+// We'll shift color gradually one BG point at a time
+// We'll shift through the rainbow colors of ROY-G-BIV from low to high
+// Start at red for lowGlucose, green for targetGlucose, and violet for highGlucose
+public func setDynamicBGColor(bgValue: Int, lowGlucose: Int, highGlucose: Int, targetGlucose: Int) -> Color {
+    let redHue: CGFloat = 0.0 / 360.0 // 0 degrees
+    let greenHue: CGFloat = 120.0 / 360.0 // 120 degrees
+    let purpleHue: CGFloat = 270.0 / 360.0 // 270 degrees
+
+    // Calculate the hue based on the bgLevel
+    var hue: CGFloat
+    if bgValue <= lowGlucose {
+        hue = redHue
+    } else if bgValue >= highGlucose {
+        hue = purpleHue
+    } else if bgValue <= targetGlucose {
+        // Interpolate between red and green
+        let ratio = CGFloat(bgValue - lowGlucose) / CGFloat(targetGlucose - lowGlucose)
+        hue = redHue + ratio * (greenHue - redHue)
+    } else {
+        // Interpolate between green and purple
+        let ratio = CGFloat(bgValue - targetGlucose) / CGFloat(highGlucose - targetGlucose)
+        hue = greenHue + ratio * (purpleHue - greenHue)
+    }
+
+    // Return the color with full saturation and brightness
+    let color = Color(hue: hue, saturation: 0.6, brightness: 0.9)
+    return color
+}