CGPoint extended initializers implemented

Author: bubski

Foundation/NSGeometry.swift

@@ -25,6 +25,20 @@ public struct CGPoint {
     }
 }
 
+extension CGPoint {
+    public static var zero: CGPoint {
+        return CGPoint(x: CGFloat(0), y: CGFloat(0))
+    }
+    
+    public init(x: Int, y: Int) {
+        self.init(x: CGFloat(x), y: CGFloat(y))
+    }
+    
+    public init(x: Double, y: Double) {
+        self.init(x: CGFloat(x), y: CGFloat(y))
+    }
+}
+
 extension CGPoint: Equatable {
     public static func ==(lhs: CGPoint, rhs: CGPoint) -> Bool {
         return lhs.x == rhs.x && lhs.y == rhs.y

TestFoundation/TestNSGeometry.swift

@@ -27,6 +27,7 @@ class TestNSGeometry : XCTestCase {
             ("test_CGFloat_LessThanOrEqual", test_CGFloat_LessThanOrEqual),
             ("test_CGFloat_GreaterThanOrEqual", test_CGFloat_GreaterThanOrEqual),
             ("test_CGPoint_BasicConstruction", test_CGPoint_BasicConstruction),
+            ("test_CGPoint_ExtendedConstruction", test_CGPoint_ExtendedConstruction),
             ("test_CGSize_BasicConstruction", test_CGSize_BasicConstruction),
             ("test_CGRect_BasicConstruction", test_CGRect_BasicConstruction),
             ("test_NSEdgeInsets_BasicConstruction", test_NSEdgeInsets_BasicConstruction),
@@ -112,6 +113,20 @@ class TestNSGeometry : XCTestCase {
         XCTAssertEqual(p2.x, CGFloat(3.6))
         XCTAssertEqual(p2.y, CGFloat(4.5))
     }
+    
+    func test_CGPoint_ExtendedConstruction() {
+        let p1 = CGPoint.zero
+        XCTAssertEqual(p1.x, CGFloat(0))
+        XCTAssertEqual(p1.y, CGFloat(0))
+        
+        let p2 = CGPoint(x: Int(3), y: Int(4))
+        XCTAssertEqual(p2.x, CGFloat(3))
+        XCTAssertEqual(p2.y, CGFloat(4))
+        
+        let p3 = CGPoint(x: Double(3.6), y: Double(4.5))
+        XCTAssertEqual(p3.x, CGFloat(3.6))
+        XCTAssertEqual(p3.y, CGFloat(4.5))
+    }
 
     func test_CGSize_BasicConstruction() {
         let s1 = CGSize()