#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 the renderer for a legend entry.
  /// </summary>
  internal class LegendEntryRenderer : Renderer
  {
    /// <summary>
    /// Initializes a new instance of the LegendEntryRenderer class with the specified renderer
    /// parameters.
    /// </summary>
    internal LegendEntryRenderer(RendererParameters parms)
      : base(parms)
    { }

    /// <summary>
    /// Calculates the space used by the legend entry.
    /// </summary>
    internal override void Format()
    {
      XGraphics gfx = this.rendererParms.Graphics;
      LegendEntryRendererInfo leri = (LegendEntryRendererInfo)this.rendererParms.RendererInfo;

      // Initialize
      leri.MarkerArea.Width = MaxLegendMarkerWidth;
      leri.MarkerArea.Height = MaxLegendMarkerHeight;
      leri.MarkerSize = new XSize();
      leri.MarkerSize.Width = leri.MarkerArea.Width;
      leri.MarkerSize.Height = leri.MarkerArea.Height;
      if (leri.seriesRendererInfo.series.chartType == ChartType.Line)
        leri.MarkerArea.Width *= 3;
      leri.Width = leri.MarkerArea.Width;
      leri.Height = leri.MarkerArea.Height;

      if (leri.EntryText != "")
      {
        leri.TextSize = gfx.MeasureString(leri.EntryText, leri.legendRendererInfo.Font);
        if (leri.seriesRendererInfo.series.chartType == ChartType.Line)
        {
          leri.MarkerSize.Width = leri.seriesRendererInfo.markerRendererInfo.MarkerSize.Value;
          leri.MarkerArea.Width = Math.Max(3 * leri.MarkerSize.Width, leri.MarkerArea.Width);
        }

        leri.MarkerArea.Height = Math.Min(leri.MarkerArea.Height, leri.TextSize.Height);
        leri.MarkerSize.Height = Math.Min(leri.MarkerSize.Height, leri.TextSize.Height);
        leri.Width = leri.TextSize.Width + leri.MarkerArea.Width + SpacingBetweenMarkerAndText;
        leri.Height = leri.TextSize.Height;
      }
    }

    /// <summary>
    /// Draws one legend entry.
    /// </summary>
    internal override void Draw()
    {
      XGraphics gfx = this.rendererParms.Graphics;
      LegendEntryRendererInfo leri = (LegendEntryRendererInfo)this.rendererParms.RendererInfo;

      XRect rect;
      if (leri.seriesRendererInfo.series.chartType == ChartType.Line)
      {
        // Draw line.
        XPoint posLineStart = new XPoint(leri.X, leri.Y + leri.Height / 2);
        XPoint posLineEnd = new XPoint(leri.X + leri.MarkerArea.Width, leri.Y + leri.Height / 2);
        gfx.DrawLine(new XPen(((XSolidBrush)leri.MarkerBrush).Color), posLineStart, posLineEnd);

        // Draw marker.
        double x = leri.X + leri.MarkerArea.Width / 2;
        XPoint posMarker = new XPoint(x, leri.Y + leri.Height / 2);
        MarkerRenderer.Draw(gfx, posMarker, leri.seriesRendererInfo.markerRendererInfo);
      }
      else
      {
        // Draw series rectangle for column, bar or pie charts.
        rect = new XRect(leri.X, leri.Y, leri.MarkerArea.Width, leri.MarkerArea.Height);
        rect.Y += (leri.Height - leri.MarkerArea.Height) / 2;
        gfx.DrawRectangle(leri.MarkerPen, leri.MarkerBrush, rect);
      }

      // Draw text
      if (leri.EntryText.Length > 0)
      {
        rect = leri.Rect;
        rect.X += leri.MarkerArea.Width + LegendEntryRenderer.SpacingBetweenMarkerAndText;
        XStringFormat format = new XStringFormat();
        format.LineAlignment = XLineAlignment.Near;
        gfx.DrawString(leri.EntryText, leri.legendRendererInfo.Font,
                       leri.legendRendererInfo.FontColor, rect, format);
      }
    }

    /// <summary>
    /// Absolute width for markers (including line) in point.
    /// </summary>
    private const double MarkerWidth = 4.3; // 1.5 mm

    /// <summary>
    /// Maximum legend marker width in point.
    /// </summary>
    private const double MaxLegendMarkerWidth = 7; // 2.5 mm

    /// <summary>
    /// Maximum legend marker height in point.
    /// </summary>
    private const double MaxLegendMarkerHeight = 7; // 2.5 mm

    /// <summary>
    /// Insert spacing between marker and text in point.
    /// </summary>
    private const double SpacingBetweenMarkerAndText = 4.3; // 1.5 mm
  }
}
