using System.Windows;
using Microsoft.Research.DynamicDataDisplay.Common;
using System.Diagnostics;

namespace Microsoft.Research.DynamicDataDisplay
{
	public static class RectExtensions
	{
		public static Point GetCenter(this Rect rect)
		{
			return new Point(rect.Left + rect.Width * 0.5, rect.Top + rect.Height * 0.5);
		}

		public static Rect FromCenterSize(Point center, Size size)
		{
			return FromCenterSize(center, size.Width, size.Height);
		}

		public static Rect FromCenterSize(Point center, double width, double height)
		{
			Rect res = new Rect(center.X - width / 2, center.Y - height / 2, width, height);
			return res;
		}

		public static Rect Zoom(this Rect rect, Point to, double ratio)
		{
			return CoordinateUtilities.RectZoom(rect, to, ratio);
		}

		public static Rect ZoomOutFromCenter(this Rect rect, double ratio)
		{
			return CoordinateUtilities.RectZoom(rect, rect.GetCenter(), ratio);
		}

		public static Rect ZoomInToCenter(this Rect rect, double ratio)
		{
			return CoordinateUtilities.RectZoom(rect, rect.GetCenter(), 1 / ratio);
		}

		public static Int32Rect ToInt32Rect(this Rect rect)
		{
			Int32Rect intRect = new Int32Rect(
				(int)rect.X,
				(int)rect.Y,
				(int)rect.Width,
				(int)rect.Height);

			return intRect;
		}

		[DebuggerStepThrough]
		public static DataRect ToDataRect(this Rect rect)
		{
			return new DataRect(rect);
		}

		internal static bool IsNaN(this Rect rect)
		{
			return !rect.IsEmpty && (
				rect.X.IsNaN() ||
				rect.Y.IsNaN() ||
				rect.Width.IsNaN() ||
				rect.Height.IsNaN()
				);
		}
	}
}