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

using System.Windows;
using System.Windows.Media;
using Microsoft.Research.DynamicDataDisplay.DataSources;
using Microsoft.Research.DynamicDataDisplay.PointMarkers;
using Microsoft.Research.DynamicDataDisplay.Common;

namespace Microsoft.Research.DynamicDataDisplay
{
  public class MarkerPointsGraph : PointsGraphBase
  {
    /// <summary>
    /// Initializes a new instance of the <see cref="MarkerPointsGraph"/> class.
    /// </summary>
    public MarkerPointsGraph()
    {
      ManualTranslate = true;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="MarkerPointsGraph"/> class.
    /// </summary>
    /// <param name="dataSource">The data source.</param>
    public MarkerPointsGraph(IPointDataSource dataSource)
      : this()
    {
      DataSource = dataSource;
    }

    protected override void OnVisibleChanged(DataRect newRect, DataRect oldRect)
    {
      base.OnVisibleChanged(newRect, oldRect);
      InvalidateVisual();
    }

    public PointMarker Marker
    {
      get { return (PointMarker)GetValue(MarkerProperty); }
      set { SetValue(MarkerProperty, value); }
    }

    public static readonly DependencyProperty MarkerProperty =
      DependencyProperty.Register(
        "Marker",
        typeof(PointMarker),
        typeof(MarkerPointsGraph),
        new FrameworkPropertyMetadata { DefaultValue = null, AffectsRender = true }
          );

    protected override void OnRenderCore(DrawingContext dc, RenderState state)
    {
      if (DataSource == null) return;
      if (Marker == null) return;

      var transform = Plotter2D.Viewport.Transform;

      DataRect bounds = DataRect.Empty;
      using (IPointEnumerator enumerator = DataSource.GetEnumerator(GetContext()))
      {
        Point point = new Point();
        while (enumerator.MoveNext())
        {
          enumerator.GetCurrent(ref point);
          enumerator.ApplyMappings(Marker);

          //Point screenPoint = point.Transform(state.Visible, state.Output);
          Point screenPoint = point.DataToScreen(transform);

          bounds = DataRect.Union(bounds, point);
          Marker.Render(dc, screenPoint);
        }
      }

      Viewport2D.SetContentBounds(this, bounds);
    }
  }
}