source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Shapes/PivotSegmentEditor.cs @ 13398

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Markup;
using System.Windows;
using System.Windows.Data;
using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;
using System.Windows.Threading;
using Microsoft.Research.DynamicDataDisplay.Converters;
using System.Globalization;
using System.Windows.Controls;
using System.Diagnostics.Contracts;
using System.Windows.Shapes;
using System.Windows.Media;
using System.Diagnostics;
using System.ComponentModel;

namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes
{
  public class PivotSegmentEditor : FrameworkElement, IPlotterElement, INotifyPropertyChanged
  {
    private Plotter2D plotter = null;
    private ViewportHostPanel panel = new ViewportHostPanel();
    private Segment segment;
    private DraggablePoint startThumb;
    private DraggablePoint endThumb;
    private Func<double, string> xMapping = d => d.ToString("F");
    private readonly ViewportRay leftRay;
    private readonly ViewportRay rightRay;

    /// <summary>
    /// Initializes a new instance of the <see cref="PivotSegmentEditor"/> class.
    /// </summary>
    public PivotSegmentEditor()
    {
      ResourceDictionary resources = new ResourceDictionary
      {
        Source = new Uri("/DynamicDataDisplay;component/Charts/Shapes/PivotSegmentEditor.xaml", UriKind.Relative)
      };

      panel.BeginBatchAdd();

      ControlTemplate segmentTemplate = (ControlTemplate)resources["segment"];
      segment = (Segment)segmentTemplate.LoadContent();
      segment.DataContext = this;

      ControlTemplate startThumbTemplate = (ControlTemplate)resources["leftThumb"];
      startThumb = (DraggablePoint)startThumbTemplate.LoadContent();
      startThumb.DataContext = this;

      ControlTemplate endThumbTemplate = (ControlTemplate)resources["rightThumb"];
      endThumb = (DraggablePoint)endThumbTemplate.LoadContent();
      endThumb.DataContext = this;

      ControlTemplate leftRayTemplate = (ControlTemplate)resources["leftRay"];
      leftRay = (ViewportRay)leftRayTemplate.LoadContent();
      leftRay.DataContext = this;

      ControlTemplate rightRayTemplate = (ControlTemplate)resources["rightRay"];
      rightRay = (ViewportRay)rightRayTemplate.LoadContent();
      rightRay.DataContext = this;

      ControlTemplate mTextTemplate = (ControlTemplate)resources["mText"];
      TextBlock mText = (TextBlock)mTextTemplate.LoadContent();
      panel.Children.Add(mText);
      mText.DataContext = this;

      ControlTemplate leftPointGridTemplate = (ControlTemplate)resources["leftPointGrid"];
      Panel leftPointGrid = (Panel)leftPointGridTemplate.LoadContent();
      panel.Children.Add(leftPointGrid);
      leftPointGrid.DataContext = this;

      ControlTemplate rightPointGridTemplate = (ControlTemplate)resources["rightPointGrid"];
      Panel rightPointGrid = (Panel)rightPointGridTemplate.LoadContent();
      panel.Children.Add(rightPointGrid);
      rightPointGrid.DataContext = this;

      ControlTemplate leftTextTemplate = (ControlTemplate)resources["leftText"];
      FrameworkElement leftBorder = (FrameworkElement)leftTextTemplate.LoadContent();
      panel.Children.Add(leftBorder);
      leftBorder.DataContext = this;

      ControlTemplate rightTextTemplate = (ControlTemplate)resources["rightText"];
      FrameworkElement rightBorder = (FrameworkElement)rightTextTemplate.LoadContent();
      panel.Children.Add(rightBorder);
      rightBorder.DataContext = this;
    }

    #region Properties

    #region XMapping property

    [NotNull]
    public Func<double, string> XMapping
    {
      get { return xMapping; }
      set
      {
        Contract.Assert(value != null);

        xMapping = value;
        PropertyChanged.Raise(this, "");
      }
    }

    #endregion

    #region Point1 property

    public Point Point1
    {
      get { return (Point)GetValue(Point1Property); }
      set { SetValue(Point1Property, value); }
    }

    public static readonly DependencyProperty Point1Property = DependencyProperty.Register(
      "Point1",
      typeof(Point),
      typeof(PivotSegmentEditor),
      new FrameworkPropertyMetadata(new Point(0, 0), OnPointChanged));

    private static void OnPointChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      PivotSegmentEditor owner = (PivotSegmentEditor)d;
      owner.CoerceValue(LeftYProperty);
      owner.CoerceValue(RightYProperty);
      owner.OnPointChanged();
    }

    private void OnPointChanged()
    {
      PropertyChanged.Raise(this, "");
    }

    #endregion

    #region Point2 property

    public Point Point2
    {
      get { return (Point)GetValue(Point2Property); }
      set { SetValue(Point2Property, value); }
    }

    public static readonly DependencyProperty Point2Property = DependencyProperty.Register(
      "Point2",
      typeof(Point),
      typeof(PivotSegmentEditor),
      new FrameworkPropertyMetadata(new Point(1, 1), OnPointChanged));

    #endregion

    #region LineStroke property

    public Brush LineStroke
    {
      get { return (Brush)GetValue(LineStrokeProperty); }
      set { SetValue(LineStrokeProperty, value); }
    }

    public static readonly DependencyProperty LineStrokeProperty = DependencyProperty.Register(
      "LineStroke",
      typeof(Brush),
      typeof(PivotSegmentEditor),
      new FrameworkPropertyMetadata(Brushes.Black));

    #endregion

    #region LineThickness property

    public double LineThickness
    {
      get { return (double)GetValue(LineThicknessProperty); }
      set { SetValue(LineThicknessProperty, value); }
    }

    public static readonly DependencyProperty LineThicknessProperty = DependencyProperty.Register(
      "LineThickbess",
      typeof(double),
      typeof(PivotSegmentEditor),
      new FrameworkPropertyMetadata(2.0));

    #endregion

    #region LeftY property

    public double LeftY
    {
      get { return (double)GetValue(LeftYProperty); }
    }

    private static readonly DependencyPropertyKey LeftYPropertyKey = DependencyProperty.RegisterReadOnly(
      "LeftY",
      typeof(double),
      typeof(PivotSegmentEditor),
      new FrameworkPropertyMetadata(null, OnLeftYCoerce));

    public static readonly DependencyProperty LeftYProperty = LeftYPropertyKey.DependencyProperty;

    private Func<double, double> GetLineFunc()
    {
      Viewport2D viewport = plotter.Viewport;
      double deltaX = Point1.X - Point2.X;
      double deltaY = Point1.Y - Point2.Y;
      double m = deltaY / deltaX;
      double b = Point1.Y - Point1.X * deltaY / deltaX;

      Func<double, double> func = x => m * x + b;

      return func;
    }

    private static object OnLeftYCoerce(DependencyObject source, object value)
    {
      PivotSegmentEditor editor = (PivotSegmentEditor)source;
      if (editor.plotter == null)
        return value;

      Func<double, double> func = editor.GetLineFunc();
      double xmin = editor.plotter.Viewport.Visible.XMin;
      double result = func(xmin);

      return result;
    }

    #endregion

    #region RightY property

    public double RightY
    {
      get { return (double)GetValue(RightYProperty); }
    }

    private static readonly DependencyPropertyKey RightYPropertyKey = DependencyProperty.RegisterReadOnly(
      "RightY",
      typeof(double),
      typeof(PivotSegmentEditor),
      new FrameworkPropertyMetadata(null, OnRightYCoerce));

    public static readonly DependencyProperty RightYProperty = RightYPropertyKey.DependencyProperty;

    private static object OnRightYCoerce(DependencyObject source, object value)
    {
      PivotSegmentEditor editor = (PivotSegmentEditor)source;
      if (editor.plotter == null)
        return value;

      Func<double, double> func = editor.GetLineFunc();
      double xmax = editor.plotter.Viewport.Visible.XMax;
      double result = func(xmax);

      return result;
    }
    #endregion

    public double M
    {
      get { return (Point1.Y - Point2.Y) / (Point1.X - Point2.X); }
      set { Debug.WriteLine("M set = " + value.ToString()); }
    }

    public string LeftName
    {
      get
      {
        return String.Format("({0}, {1:F})", xMapping(Point1.X), Point1.Y);
      }
    }

    public string RightName
    {
      get
      {
        return String.Format("({0}, {1:F})", xMapping(Point2.X), Point2.Y);
      }
    }

    public Point Center
    {
      get
      {
        return Point1 + (Point2 - Point1) / 2;
      }
    }

    #endregion

    #region IPlotterElement Members

    public void OnPlotterAttached(Plotter plotter)
    {
      this.plotter = (Plotter2D)plotter;

      this.plotter.Viewport.PropertyChanged += OnViewport_PropertyChanged;

      plotter.Dispatcher.BeginInvoke(() =>
      {
        plotter.Children.AddMany(
          segment,
          startThumb,
          endThumb,
          panel,
          leftRay,
          rightRay);

        CoerceValue(LeftYProperty);
        CoerceValue(RightYProperty);

        PropertyChanged.Raise(this, "");
      }, DispatcherPriority.Normal);
    }

    private void OnViewport_PropertyChanged(object sender, ExtendedPropertyChangedEventArgs e)
    {
      CoerceValue(LeftYProperty);
      CoerceValue(RightYProperty);
    }

    public void OnPlotterDetaching(Plotter plotter)
    {
      this.plotter.Viewport.PropertyChanged -= OnViewport_PropertyChanged;

      plotter.Dispatcher.BeginInvoke(() =>
      {
        plotter.Children.RemoveAll(
          segment,
          startThumb,
          endThumb,
          panel,
          leftRay,
          rightRay);
      }, DispatcherPriority.Normal);

      this.plotter = null;
    }

    public Plotter2D Plotter
    {
      get { return plotter; }
    }

    Plotter IPlotterElement.Plotter
    {
      get { return plotter; }
    }

    #endregion

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    #endregion
  }

  public sealed class MToVerticalOffsetConverter : GenericValueConverter<double>
  {
    public override object ConvertCore(double value, Type targetType, object parameter, CultureInfo culture)
    {
      if (value > 0)
        return 2.0;
      else
        return -2.0;
    }
  }

  public sealed class MToVerticalAlignmentInvertedConverter : GenericValueConverter<double>
  {
    public override object ConvertCore(double value, Type targetType, object parameter, CultureInfo culture)
    {
      if (value > 0)
        return VerticalAlignment.Bottom;
      else
        return VerticalAlignment.Top;
    }
  }

  public sealed class MToVerticalAlignmentConverter : GenericValueConverter<double>
  {
    public override object ConvertCore(double value, Type targetType, object parameter, CultureInfo culture)
    {
      if (value > 0)
        return VerticalAlignment.Top;
      else
        return VerticalAlignment.Bottom;
    }
  }
}