source: branches/HeuristicLab.Problems.GrammaticalOptimization/SharpVectorCore/Svg/ClippingMaskingCompositing/ISharpMarkerHost.cs @ 12762

using System;

namespace SharpVectors.Dom.Svg
{
  /// <summary>
  /// This is an extension to the Svg DOM. It denotes that an element can
  /// display markers.
  /// </summary>
  /// <remarks>
  /// <p>
  /// A marker is a symbol which is attached to one or more vertices of
  /// some Svg elements.  In order for a marker to be drawn correctly,
  /// its orientation and position needs to be known.
  /// See <a href="http://www.w3.org/TR/SVG/painting.html"
  /// >SVG 1.0 Masking - Establishing A New Clipping Path</a>
  /// </p>
  /// <p>
  /// This interface provides the information required to calculate the
  /// orientation and position for each marker of an Svg element.
  /// </p>
  /// <p>
  /// To give an Svg element the capability to draw markers, let the Svg
  /// element implement this interface.
  /// </p>
  /// </remarks>
  public interface ISharpMarkerHost
  {
    /// <summary>
    /// An array specifying the position of each vertex in the Svg
    /// element's shape.
    /// </summary>
        SvgPointF[] MarkerPositions
    {
      get;
    }
    
    /// <summary>
    /// Get the angle of the path segment entering the specified vertex.
    /// </summary>
    /// <param name="index">
    /// Specifies the vertex to which the path segment is entering.
    /// </param>
    /// <returns>
    /// The angle of the path segment entering the specified vertex
    /// in degrees.
    /// </returns>
        double GetStartAngle(int index);
    
    /// <summary>
    /// Get the angle of the path segment leaving the specified vertex
    /// in degrees.
    /// </summary>
    /// <param name="index">
    /// Specifies the vertex from which the path segment is leaving.
    /// </param>
    /// <returns>
    /// The angle of the path segment leaving the specified vertex.
    /// </returns>
        double GetEndAngle(int index);
  }
}