source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/DependentPlotter.cs @ 12503

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
    }
  }
}