Add RGBColor struct

Sources/SpellbookFoundation/GUI/RGBColor.swift

@@ -0,0 +1,42 @@
+//
+//  RGBColor.swift
+//  SwiftSpellbook
+//
+//  Created by Alkenso (Vladimir Vashurkin) on 2025-01-30.
+//
+
+import CoreGraphics
+
+#if canImport(CoreGraphics)
+
+public struct RGBColor: Hashable, Codable {
+    public var red: CGFloat
+    public var green: CGFloat
+    public var blue: CGFloat
+    public var alpha: CGFloat
+
+    public init(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat = 1.0) {
+        self.red = red
+        self.green = green
+        self.blue = blue
+        self.alpha = alpha
+    }
+}
+
+extension RGBColor {
+    public var cgColor: CGColor {
+        CGColor(red: red, green: green, blue: blue, alpha: alpha)
+    }
+}
+
+extension RGBColor {
+    public static func random(
+        red: ClosedRange<CGFloat> = 0...1,
+        green: ClosedRange<CGFloat> = 0...1,
+        blue: ClosedRange<CGFloat> = 0...1
+    ) -> RGBColor {
+        .init(red: .random(in: red), green: .random(in: green), blue: .random(in: blue))
+    }
+}
+
+#endif