New function added to CGPath.

Sources/VectorExtor/CGPath+Extensions.swift

@@ -92,6 +92,51 @@ public extension CGPath {
 
 		return nil
 	}
+
+
+	/// This function computes the center point of the path.  This swift implementation was taken from
+	/// https://stackoverflow.com/a/53319889/880807
+	///
+	/// - Returns: A CGPoint representing the centre point of the path.
+	func findCenter() -> CGPoint {
+		class Context {
+			var sumX: CGFloat = 0
+			var sumY: CGFloat = 0
+			var points = 0
+		}
+
+		let context = Context()
+
+		applyWithBlock { element in
+			switch element.pointee.type {
+				case .moveToPoint, .addLineToPoint:
+					let point = element.pointee.points[0]
+					context.sumX += point.x
+					context.sumY += point.y
+					context.points += 1
+				case .addQuadCurveToPoint:
+					let controlPoint = element.pointee.points[0]
+					let point = element.pointee.points[1]
+					context.sumX += point.x + controlPoint.x
+					context.sumY += point.y + controlPoint.y
+					context.points += 2
+				case .addCurveToPoint:
+					let controlPoint1 = element.pointee.points[0]
+					let controlPoint2 = element.pointee.points[1]
+					let point = element.pointee.points[2]
+					context.sumX += point.x + controlPoint1.x + controlPoint2.x
+					context.sumY += point.y + controlPoint1.y + controlPoint2.y
+					context.points += 3
+				case .closeSubpath:
+					break
+				@unknown default:
+					break
+			}
+		}
+
+		return CGPoint(x: context.sumX / CGFloat(context.points),
+					   y: context.sumY / CGFloat(context.points))
+	}
 }
 
 #endif