using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Diagnostics;



namespace Microsoft.Research.DynamicDataDisplay

{

	/// <summary>

	/// Represents a special embedded kind of plotter.

	/// Follows an outer's plotter Visible change when this is general panning or zooming via MouseNavigation.

	/// Does not reacts on panning or zooming only in one direction (via AxisNavigation or KeyboardNavigation.

	/// </summary>

	public class DependentPlotter : InjectedPlotterBase

	{

		/// <summary>

		/// Initializes a new instance of the <see cref="DependentPlotter"/> class.

		/// </summary>

		public DependentPlotter() : base() { }



		protected override DataRect CoerceVisible(DataRect newVisible, DataRect baseVisible)

		{

			return baseVisible;

		}



		private bool IsHandledChangeType(ChangeType changeType)

		{

			bool handled = false;

			switch (changeType)

			{

				case ChangeType.Pan:

				case ChangeType.Zoom:

					handled = true;

					break;

				case ChangeType.PanX:

				case ChangeType.ZoomX:

					handled = (ConjunctionMode == ViewportConjunctionMode.X) || (ConjunctionMode == ViewportConjunctionMode.XY);

					break;

				case ChangeType.PanY:

				case ChangeType.ZoomY:

					handled = (ConjunctionMode == ViewportConjunctionMode.Y) || (ConjunctionMode == ViewportConjunctionMode.XY);

					break;

			}

			return handled;

		}



		protected override void OuterViewport_PropertyChanged(ExtendedPropertyChangedEventArgs e)

		{

			if(e.PropertyName != Viewport2D.VisiblePropertyName)

				return;



			if (IsHandledChangeType(e.ChangeType))

			{

				DataRect newRect = (DataRect)e.NewValue;

				DataRect oldRect = (DataRect)e.OldValue;



				double ratioX = newRect.Width / oldRect.Width;

				double ratioY = newRect.Height / oldRect.Height;

				double shiftX = (newRect.XMin - oldRect.XMin) / oldRect.Width;

				double shiftY = (newRect.YMin - oldRect.YMin) / oldRect.Height;



				DataRect visible = Viewport.Visible;



				visible.XMin += shiftX * visible.Width;

				visible.YMin += shiftY * visible.Height;

				visible.Width *= ratioX;

				visible.Height *= ratioY;



				Viewport.Visible = visible;

			}

		}



		public override void OnPlotterAttached(Plotter plotter)

		{

			base.OnPlotterAttached(plotter);



			Plotter.Viewport.FittedToView += Viewport_FittedToView;

		}



		public override void OnPlotterDetaching(Plotter plotter)

		{

			Plotter.Viewport.FittedToView -= Viewport_FittedToView;



			base.OnPlotterDetaching(plotter);

		}



		private void Viewport_FittedToView(object sender, EventArgs e)

		{

			FitToView();

		}



		protected override void OnConjunctionModeChanged()

		{

			// do nothing

		}

	}

}