using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Media.TextFormatting;

using Microsoft.Research.DynamicDataDisplay.Common;



namespace Microsoft.Research.DynamicDataDisplay

{

    public static class DataRectExtensions

    {

        internal static bool IsNaN( this DataRect rect )

        {

            return !rect.IsEmpty &&

                (

                rect.XMin.IsNaN() ||

                rect.YMin.IsNaN() ||

                rect.XMax.IsNaN() ||

                rect.YMax.IsNaN()

                );

        }



        /// <summary>

        /// Gets the center of specified rectangle.

        /// </summary>

        /// <param name="rect">The rect.</param>

        /// <returns></returns>

        public static Point GetCenter( this DataRect rect )

        {

            return new Point( rect.XMin + rect.Width * 0.5, rect.YMin + rect.Height * 0.5 );

        }



        public static DataRect Zoom( this DataRect rect, Point to, double ratio )

        {

            return CoordinateUtilities.RectZoom( rect, to, ratio );

        }



        /// <summary>

        /// Zooms out from center.

        /// </summary>

        /// <param name="rect">The rect.</param>

        /// <param name="ratio">The ratio.</param>

        /// <returns></returns>

        public static DataRect ZoomOutFromCenter( this DataRect rect, double ratio )

        {

            return CoordinateUtilities.RectZoom( rect, rect.GetCenter(), ratio );

        }



        /// <summary>

        /// Zooms in to center.

        /// </summary>

        /// <param name="rect">The rect.</param>

        /// <param name="ratio">The ratio.</param>

        /// <returns></returns>

        public static DataRect ZoomInToCenter( this DataRect rect, double ratio )

        {

            return CoordinateUtilities.RectZoom( rect, rect.GetCenter(), 1 / ratio );

        }



        public static DataRect ZoomX( this DataRect rect, Point to, double ratio )

        {

            return CoordinateUtilities.RectZoomX( rect, to, ratio );

        }



        public static DataRect ZoomY( this DataRect rect, Point to, double ratio )

        {

            return CoordinateUtilities.RectZoomY( rect, to, ratio );

        }



        /// <summary>

        /// Gets the square of specified DataRect. 

        /// </summary>

        /// <param name="rect">The rect.</param>

        /// <returns></returns>

        public static double GetSquare( this DataRect rect )

        {

            if ( rect.IsEmpty )

                return 0;



            return rect.Width * rect.Height;

        }



        /// <summary>

        /// Determines whether one DataRect is close to another DataRect.

        /// </summary>

        /// <param name="rect1">The rect1.</param>

        /// <param name="rect2">The rect2.</param>

        /// <param name="difference">The difference.</param>

        /// <returns>

        /// 	<c>true</c> if [is close to] [the specified rect1]; otherwise, <c>false</c>.

        /// </returns>

        public static bool IsCloseTo( this DataRect rect1, DataRect rect2, double difference )

        {

            DataRect intersection = DataRect.Intersect( rect1, rect2 );

            double square1 = rect1.GetSquare();

            double square2 = rect2.GetSquare();

            double intersectionSquare = intersection.GetSquare();



            bool areClose = MathHelper.AreClose( square1, intersectionSquare, difference ) &&

                MathHelper.AreClose( square2, intersectionSquare, difference );

            return areClose;

        }



        public static DataRect WithX( this DataRect rect, double xmin, double xmax )

        {

            return DataRect.Create( xmin, rect.YMin, xmax, rect.YMax );

        }



        public static DataRect WithY( this DataRect rect, double ymin, double ymax )

        {

            return DataRect.Create( rect.XMin, ymin, rect.XMax, ymax );

        }

    }

}