source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Isolines/AdditionalLinesRenderer.cs @ 12503

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Media;
using System.Windows;
using System.Windows.Data;
using System.Diagnostics;

namespace Microsoft.Research.DynamicDataDisplay.Charts.Isolines
{
  public class AdditionalLinesRenderer : IsolineRenderer
  {
    protected override void CreateUIRepresentation()
    {
      InvalidateVisual();
    }

    protected override void OnPlotterAttached()
    {
      base.OnPlotterAttached();

      FrameworkElement parent = (FrameworkElement)Parent;
      var renderer = (FrameworkElement)parent.FindName("PART_IsolineRenderer");

      Binding contentBoundsBinding = new Binding { Path = new PropertyPath("(0)", Viewport2D.ContentBoundsProperty), Source = renderer };
      SetBinding(Viewport2D.ContentBoundsProperty, contentBoundsBinding);
      SetBinding(ViewportPanel.ViewportBoundsProperty, contentBoundsBinding);

      Plotter2D.Viewport.EndPanning += Viewport_EndPanning;
      Plotter2D.Viewport.PropertyChanged += Viewport_PropertyChanged;
    }

    void Viewport_PropertyChanged(object sender, ExtendedPropertyChangedEventArgs e)
    {
      if (e.PropertyName == "Visible")
      {
        if (Plotter2D.Viewport.PanningState == Viewport2DPanningState.NotPanning)
          InvalidateVisual();
      }
    }

    protected override void OnPlotterDetaching()
    {
      Plotter2D.Viewport.EndPanning -= Viewport_EndPanning;
      Plotter2D.Viewport.PropertyChanged -= Viewport_PropertyChanged;

      base.OnPlotterDetaching();
    }

    private void Viewport_EndPanning(object sender, EventArgs e)
    {
      InvalidateVisual();
    }

    protected override void OnRender(DrawingContext drawingContext)
    {
      if (Plotter2D == null) return;
      if (DataSource == null) return;

      var collection = (IsolineCollection)Parent.GetValue(IsolineCollectionProperty);
      if (collection == null) return;

      var bounds = ViewportPanel.GetViewportBounds(this);
      if (bounds.IsEmpty) return;

      var dc = drawingContext;
      var strokeThickness = StrokeThickness;

      var transform = Plotter2D.Transform.WithRects(bounds, new Rect(RenderSize));

      //dc.DrawRectangle(null, new Pen(Brushes.Green, 2), new Rect(RenderSize));

      var additionalLevels = GetAdditionalLevels(collection);
      IsolineBuilder.DataSource = DataSource;
      var additionalIsolineCollections = additionalLevels.Select(level =>
      {
        return IsolineBuilder.BuildIsoline(level);
      });

      foreach (var additionalCollection in additionalIsolineCollections)
      {
        RenderIsolineCollection(dc, strokeThickness, additionalCollection, transform);
      }
    }
  }
}