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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Media;
using System.Windows;
using System.Windows.Shapes;
using Microsoft.Research.DynamicDataDisplay;

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
  /// <summary>
  /// Represents a segment with start and end points bound to viewport coordinates.
  /// </summary>
  public class Segment : ViewportShape
  {
    /// <summary>
    /// Initializes a new instance of the <see cref="Segment"/> class.
    /// </summary>
    public Segment() { }

    /// <summary>
    /// Initializes a new instance of the <see cref="Segment"/> class.
    /// </summary>
    /// <param name="startPoint">The start point of segment.</param>
    /// <param name="endPoint">The end point of segment.</param>
    public Segment(Point startPoint, Point endPoint)
    {
      StartPoint = startPoint;
      EndPoint = endPoint;
    }

    /// <summary>
    /// Gets or sets the start point of segment.
    /// </summary>
    /// <value>The start point.</value>
    public Point StartPoint
    {
      get { return (Point)GetValue(StartPointProperty); }
      set { SetValue(StartPointProperty, value); }
    }

    /// <summary>
    /// Identifies the StartPoint dependency property.
    /// </summary>
    public static readonly DependencyProperty StartPointProperty = DependencyProperty.Register(
      "StartPoint",
      typeof(Point),
      typeof(Segment),
      new FrameworkPropertyMetadata(new Point(), OnPointChanged));

    protected static void OnPointChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      Segment segment = (Segment)d;
      segment.UpdateUIRepresentation();
    }

    protected virtual void OnPointChanged() { }

    /// <summary>
    /// Gets or sets the end point of segment.
    /// </summary>
    /// <value>The end point.</value>
    public Point EndPoint
    {
      get { return (Point)GetValue(EndPointProperty); }
      set { SetValue(EndPointProperty, value); }
    }

    /// <summary>
    /// Identifies the EndPoint dependency property.
    /// </summary>
    public static readonly DependencyProperty EndPointProperty = DependencyProperty.Register(
      "EndPoint",
      typeof(Point),
      typeof(Segment),
      new FrameworkPropertyMetadata(new Point(), OnPointChanged));

    protected override void UpdateUIRepresentationCore()
    {
      if (Plotter == null)
        return;

      var transform = Plotter.Viewport.Transform;

      Point p1 = StartPoint.DataToScreen(transform);
      Point p2 = EndPoint.DataToScreen(transform);

      lineGeometry.StartPoint = p1;
      lineGeometry.EndPoint = p2;
    }

    LineGeometry lineGeometry = new LineGeometry();
    protected LineGeometry LineGeometry
    {
      get { return lineGeometry; }
    }

    protected override Geometry DefiningGeometry
    {
      get { return lineGeometry; }
    }
  }
}