diff --git a/Sources/SkipLib/CoreGraphics.swift b/Sources/SkipLib/CoreGraphics.swift
index ac5a4d0..be1972a 100644
--- a/Sources/SkipLib/CoreGraphics.swift
+++ b/Sources/SkipLib/CoreGraphics.swift
@@ -16,6 +16,12 @@ public struct CGPoint: Hashable {
         self.x = x
         self.y = y
     }
+
+    public func applying(_ transform: CGAffineTransform) -> CGPoint {
+        let px = transform.a * x + transform.c * y + transform.tx
+        let py = transform.b * x + transform.d * y + transform.ty
+        return CGPoint(x: px, y: py)
+    }
 }
 
 public struct CGSize: Hashable {
@@ -27,10 +33,18 @@ public struct CGSize: Hashable {
         self.width = width
         self.height = height
     }
+
+    public func applying(_ transform: CGAffineTransform) -> CGSize {
+        let swidth  = transform.a * width + transform.c * height
+        let sheight = transform.b * width + transform.d * height
+        return CGSize(width: swidth, height: sheight)
+    }
 }
 
 public struct CGRect: Hashable {
     public static let zero = CGRect()
+    public static let null = CGRect(x: .infinity, y: .infinity, width: 0.0, height: 0.0)
+    public static let infinite = CGRect(x: -Double.MAX_VALUE / 2.0, y: -Double.MAX_VALUE / 2.0, width: Double.MAX_VALUE, height: Double.MAX_VALUE)
     public var origin: CGPoint
     public var size: CGSize
 
@@ -42,5 +56,241 @@ public struct CGRect: Hashable {
     public init(x: Double, y: Double, width: Double, height: Double) {
         self.init(origin: CGPoint(x: x, y: y), size: CGSize(width: width, height: height))
     }
+
+    public init(x: Int, y: Int, width: Int, height: Int) {
+        self.init(origin: CGPoint(x: Double(x), y: Double(y)), size: CGSize(width: Double(width), height: Double(height)))
+    }
+
+    public var height: CGFloat {
+        get {
+            return size.height
+        }
+        set {
+            size.height = newValue
+        }
+    }
+
+    public var width: CGFloat {
+        get {
+            return size.width
+        }
+        set {
+            size.width = newValue
+        }
+    }
+
+    public var minX: CGFloat {
+        return width >= 0.0 ? origin.x : origin.x + width
+    }
+
+    public var midX: CGFloat {
+        return (minX + maxX) / 2.0
+    }
+
+    public var maxX: CGFloat {
+        return width >= 0.0 ? origin.x + width : origin.x
+    }
+
+    public var minY: CGFloat {
+        return height >= 0.0 ? origin.y : origin.y + height
+    }
+
+    public var midY: CGFloat {
+        return (minY + maxY) / 2.0
+    }
+
+    public var maxY: CGFloat {
+        return height >= 0.0 ? origin.y + height : origin.y
+    }
+
+    public var standardized: CGRect {
+        return CGRect(x: minX, y: minY, width: abs(width), height: abs(height))
+    }
+
+    public var integral: CGRect {
+        if isInfinite || isNull {
+            return self
+        }
+        let rect = standardized
+        return CGRect(x: floor(rect.minX), y: floor(rect.minY), width: ceil(rect.width), height: ceil(rect.height))
+    }
+
+    public func applying(_ transform: CGAffineTransform) -> CGRect {
+        if isInfinite || isNull {
+            return self
+        }
+        return CGRect(origin: origin.applying(transform), size: size.applying(transform))
+    }
+
+    public func insetBy(dx: CGFloat, dy: CGFloat) -> CGRect {
+        if isInfinite || isNull {
+            return self
+        }
+        let rect = standardized
+        return CGRect(x: rect.minX + dx, y: rect.minY + dy, width: rect.width - dx * 2.0, height: rect.height - dy * 2.0)
+    }
+
+    public func offsetBy(dx: CGFloat, dy: CGFloat) -> CGRect {
+        if isInfinite || isNull {
+            return self
+        }
+        let rect = standardized
+        return CGRect(x: rect.minX + dx, y: rect.minY + dy, width: rect.width, height: rect.height)
+    }
+
+    public func union(_ other: CGRect) -> CGRect {
+        if other.isEmpty {
+            return self
+        } else if isEmpty {
+            return other
+        }
+        if other.isInfinite || isInfinite {
+            return .infinite
+        }
+        let rect1 = standardized
+        let rect2 = other.standardized
+        let minX = min(rect1.minX, rect2.minX)
+        let maxX = max(rect1.maxX, rect2.maxX)
+        let minY = min(rect1.minY, rect2.minY)
+        let maxY = max(rect1.maxY, rect2.maxY)
+        return CGRect(x: minX, y: minY, width: maxX - minX, height: maxY - minY)
+    }
+
+    public func intersection(_ other: CGRect) -> CGRect {
+        if other.isEmpty || isEmpty {
+            return .null
+        }
+        if other.isInfinite {
+            return self
+        } else if isInfinite {
+            return other
+        }
+        let rect1 = standardized
+        let rect2 = other.standardized
+        let minX = max(rect1.minX, rect2.minX)
+        let maxX = min(rect1.maxX, rect2.maxX)
+        let minY = max(rect1.minY, rect2.minY)
+        let maxY = min(rect1.maxY, rect2.maxY)
+        return CGRect(x: minX, y: minY, width: max(0.0, maxX - minX), height: max(0.0, maxY - minY))
+    }
+
+    func intersects(_ other: CGRect) -> Bool {
+        return !intersection(other).isEmpty
+    }
+
+    func contains(_ point: CGPoint) -> Bool {
+        let rect = standardized
+        return point.x >= rect.minX && point.x <= rect.maxX && point.y >= rect.minY && point.y <= rect.maxY
+    }
+
+    func contains(_ rect: CGRect) -> Bool {
+        return intersection(rect) == rect
+    }
+
+    var isEmpty: Bool {
+        return width == 0.0 && height == 0.0
+    }
+
+    var isInfinite: Bool {
+        return self == .infinite
+    }
+
+    var isNull: Bool {
+        return self == .null
+    }
+}
+
+public struct CGAffineTransform: Codable, Equatable {
+    public var a = 1.0
+    public var b = 0.0
+    public var c = 0.0
+    public var d = 1.0
+    public var tx = 0.0
+    public var ty = 0.0
+
+    public static let identity = CGAffineTransform()
+
+    public init() {
+    }
+
+    public init(a: Double, b: Double, c: Double, d: Double, tx: Double, ty: Double) {
+        self.a = a
+        self.b = b
+        self.c = c
+        self.d = d
+        self.tx = tx
+        self.ty = ty
+    }
+
+    public init(a: Float, b: Float, c: Float, d: Float, tx: Float, ty: Float) {
+        self.a = Double(a)
+        self.b = Double(b)
+        self.c = Double(c)
+        self.d = Double(d)
+        self.tx = Double(tx)
+        self.ty = Double(ty)
+    }
+
+    public init(rotationAngle: CGFloat) {
+        let sinus = sin(rotationAngle)
+        let cosinus = cos(rotationAngle)
+        a = cosinus
+        b = sinus
+        c = -sinus
+        d = cosinus
+    }
+
+    public init(scaleX: CGFloat, y: CGFloat) {
+        a = scaleX
+        d = y
+    }
+
+    public init(translationX: CGFloat, y: CGFloat) {
+        tx = translationX
+        ty = y
+    }
+
+    public var isIdentity: Bool {
+        return self == Self.identity
+    }
+
+    public func concatenating(_ transform: CGAffineTransform) -> CGAffineTransform {
+        var result = CGAffineTransform()
+        result.a = transform.a * a + transform.b * c
+        result.b = transform.a * b + transform.b * d
+        result.c = transform.c * a + transform.d * c
+        result.d = transform.c * b + transform.d * d
+        result.tx = transform.tx * a + transform.ty * c + tx
+        result.ty = transform.tx * b + transform.ty * d + ty
+        return result
+    }
+
+    public func inverted() -> CGAffineTransform {
+        let determinant = a * d - c * b
+        if determinant == 0.0 {
+            return self
+        }
+
+        var result = CGAffineTransform()
+        result.a = d  / determinant
+        result.b = -b  / determinant
+        result.c = -c  / determinant
+        result.d = a  / determinant
+        result.tx = (-d * tx + c * ty) / determinant;
+        result.ty = (b * tx - a * ty) / determinant;
+        return result
+    }
+
+    public func rotated(by angle: CGFloat) -> CGAffineTransform {
+        return concatenating(CGAffineTransform(rotationAngle: angle))
+    }
+
+    public func scaledBy(x: CGFloat, y: CGFloat) -> CGAffineTransform {
+        return concatenating(CGAffineTransform(scaleX: x, y: y))
+    }
+
+    public func translatedBy(x: CGFloat, y: CGFloat) -> CGAffineTransform {
+        return concatenating(CGAffineTransform(translationX: x, y: y))
+    }
 }
 #endif
diff --git a/Sources/SkipLib/Skip/Collections.kt b/Sources/SkipLib/Skip/Collections.kt
index c03f969..ea47df4 100644
--- a/Sources/SkipLib/Skip/Collections.kt
+++ b/Sources/SkipLib/Skip/Collections.kt
@@ -758,4 +758,4 @@ val IntRange.upperBound: Int
     get() = if (endInclusive == Int.MAX_VALUE) Int.MAX_VALUE else endInclusive + 1
 val IntRange.lowerBound: Int
     get() = start
-// IntRange.isEmpty, IntRange.contains can be used as-is
+// IntRange.isEmpty, IntRange.contains can be used as-is
\ No newline at end of file