#region PDFsharp Charting - A .NET charting library based on PDFsharp
//
// Authors:
//   Niklas Schneider (mailto:Niklas.Schneider@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using PdfSharp.Drawing;

namespace PdfSharp.Charting.Renderers
{
  /// <summary>
  /// Represents a renderer for markers in line charts and legends.
  /// </summary>
  internal class MarkerRenderer
  {
    /// <summary>
    /// Draws the marker given through rendererInfo at the specified position. Position specifies
    /// the center of the marker.
    /// </summary>
    internal static void Draw(XGraphics graphics, XPoint pos, MarkerRendererInfo rendererInfo)
    {
      if (rendererInfo.MarkerStyle == MarkerStyle.None)
        return;

      double size = rendererInfo.MarkerSize;
      double size2 = size / 2;
      double x0, y0, x1, y1;
      double g;

      XPen foreground = new XPen(rendererInfo.MarkerForegroundColor, 0.5);
      XBrush background = new XSolidBrush(rendererInfo.MarkerBackgroundColor);

      XGraphicsPath gp = new XGraphicsPath();
      switch (rendererInfo.MarkerStyle)
      {
        case MarkerStyle.Square:
          x0 = pos.X - size2;
          y0 = pos.Y - size2;
          x1 = pos.X + size2;
          y1 = pos.Y + size2;
          gp.AddLine(x0, y0, x1, y0);
          gp.AddLine(x1, y0, x1, y1);
          gp.AddLine(x1, y1, x0, y1);
          gp.AddLine(x0, y1, x0, y0);
          break;

        case MarkerStyle.Diamond:
          gp.AddLine(x1 = pos.X + size2, pos.Y, pos.X, y0 = pos.Y - size2);
          gp.AddLine(pos.X, y0, x0 = pos.X - size2, pos.Y);
          gp.AddLine(x0, pos.Y, pos.X, y1 = pos.Y + size2);
          gp.AddLine(pos.X, y1, x1, pos.Y);
          break;

        case MarkerStyle.Triangle:
          y0 = pos.Y + size / 2;
          y1 = pos.Y - size / 2;
          g = Math.Sqrt(size * size * 4 / 3) / 2;
          gp.AddLine(pos.X, y1, pos.X + g, y0);
          gp.AddLine(pos.X + g, y0, pos.X - g, y0);
          gp.AddLine(pos.X - g, y0, pos.X, y1);
          break;

        case MarkerStyle.Plus:
          g = size2 / 4;
          gp.AddLine(pos.X - size2, pos.Y + g, pos.X - g, pos.Y + g);
          gp.AddLine(pos.X - g, pos.Y + g, pos.X - g, pos.Y + size2);
          gp.AddLine(pos.X - g, pos.Y + size2, pos.X + g, pos.Y + size2);
          gp.AddLine(pos.X + g, pos.Y + size2, pos.X + g, pos.Y + g);
          gp.AddLine(pos.X + g, pos.Y + g, pos.X + size2, pos.Y + g);
          gp.AddLine(pos.X + size2, pos.Y + g, pos.X + size2, pos.Y - g);
          gp.AddLine(pos.X + size2, pos.Y - g, pos.X + g, pos.Y - g);
          gp.AddLine(pos.X + g, pos.Y - g, pos.X + g, pos.Y - size2);
          gp.AddLine(pos.X + g, pos.Y - size2, pos.X - g, pos.Y - size2);
          gp.AddLine(pos.X - g, pos.Y - size2, pos.X - g, pos.Y - g);
          gp.AddLine(pos.X - g, pos.Y - g, pos.X - size2, pos.Y - g);
          gp.AddLine(pos.X - size2, pos.Y - g, pos.X - size2, pos.Y + g);
          break;

        case MarkerStyle.Circle:
        case MarkerStyle.Dot:
          x0 = pos.X - size2;
          y0 = pos.Y - size2;
          gp.AddEllipse(x0, y0, size, size);
          break;

        case MarkerStyle.Dash:
          x0 = pos.X - size2;
          y0 = pos.Y - size2 / 3;
          x1 = pos.X + size2;
          y1 = pos.Y + size2 / 3;
          gp.AddLine(x0, y0, x1, y0);
          gp.AddLine(x1, y0, x1, y1);
          gp.AddLine(x1, y1, x0, y1);
          gp.AddLine(x0, y1, x0, y0);
          break;

        case MarkerStyle.X:
          g = size / 4;
          gp.AddLine(pos.X - size2 + g, pos.Y - size2, pos.X, pos.Y - g);
          gp.AddLine(pos.X, pos.Y - g, pos.X + size2 - g, pos.Y - size2);
          gp.AddLine(pos.X + size2 - g, pos.Y - size2, pos.X + size2, pos.Y - size2 + g);
          gp.AddLine(pos.X + size2, pos.Y - size2 + g, pos.X + g, pos.Y);
          gp.AddLine(pos.X + g, pos.Y, pos.X + size2, pos.Y + size2 - g);
          gp.AddLine(pos.X + size2, pos.Y + size2 - g, pos.X + size2 - g, pos.Y + size2);
          gp.AddLine(pos.X + size2 - g, pos.Y + size2, pos.X, pos.Y + g);
          gp.AddLine(pos.X, pos.Y + g, pos.X - size2 + g, pos.Y + size2);
          gp.AddLine(pos.X - size2 + g, pos.Y + size2, pos.X - size2, pos.Y + size2 - g);
          gp.AddLine(pos.X - size2, pos.Y + size2 - g, pos.X - g, pos.Y);
          gp.AddLine(pos.X - g, pos.Y, pos.X - size2, pos.Y - size2 + g);
          break;

        case MarkerStyle.Star:
          {
            XPoint[] points = new XPoint[10];

            double radStep = 2 * Math.PI / 5;
            double outerCircle = size / 2;
            double innerCircle = size / 5;
            // outer circle
            double rad = -(Math.PI / 2); // 90°
            for (int idx = 0; idx < 10; idx += 2)
            {
              points[idx].X = pos.X + outerCircle * Math.Cos(rad);
              points[idx].Y = pos.Y + outerCircle * Math.Sin(rad);
              rad += radStep;
            }

            // inner circle
            rad = -(Math.PI / 4); // 45°
            double x = innerCircle * Math.Cos(rad);
            double y = innerCircle * Math.Sin(rad);
            points[1].X = pos.X + x;
            points[1].Y = pos.Y + y;
            points[9].X = pos.X - x;
            points[9].Y = pos.Y + y;
            rad += radStep;
            x = innerCircle * Math.Cos(rad);
            y = innerCircle * Math.Sin(rad);
            points[3].X = pos.X + x;
            points[3].Y = pos.Y + y;
            points[7].X = pos.X - x;
            points[7].Y = pos.Y + y;
            rad += radStep;
            y = innerCircle * Math.Sin(rad);
            points[5].X = pos.X;
            points[5].Y = pos.Y + y;
            gp.AddLines(points);
          }
          break;
      }

      gp.CloseFigure();
      if (rendererInfo.MarkerStyle != MarkerStyle.Dot)
      {
        graphics.DrawPath(background, gp);
        graphics.DrawPath(foreground, gp);
      }
    }
  }
}
