#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 pie chart renderer.
  /// </summary>
  internal class PieChartRenderer : ChartRenderer
  {
    /// <summary>
    /// Initializes a new instance of the PieChartRenderer class with the
    /// specified renderer parameters.
    /// </summary>
    internal PieChartRenderer(RendererParameters parms) : base(parms)
    {
    }

    /// <summary>
    /// Returns an initialized and renderer specific rendererInfo.
    /// </summary>
    internal override RendererInfo Init()
    {
      ChartRendererInfo cri = new ChartRendererInfo();
      cri.chart = (Chart)this.rendererParms.DrawingItem;
      this.rendererParms.RendererInfo = cri;

      InitSeries(cri);

      LegendRenderer lr = new PieLegendRenderer(this.rendererParms);
      cri.legendRendererInfo = (LegendRendererInfo)lr.Init();

      PlotArea plotArea = cri.chart.PlotArea;
      PlotAreaRenderer renderer = GetPlotAreaRenderer();
      cri.plotAreaRendererInfo = (PlotAreaRendererInfo)renderer.Init();

      DataLabelRenderer dlr = new PieDataLabelRenderer(this.rendererParms);
      dlr.Init();

      return cri;
    }
    
    /// <summary>
    /// Layouts and calculates the space used by the pie chart.
    /// </summary>
    internal override void Format()
    {
      ChartRendererInfo cri = (ChartRendererInfo)this.rendererParms.RendererInfo;

      LegendRenderer lr = new PieLegendRenderer(this.rendererParms);
      lr.Format();

      // Calculate rects and positions.
      XRect chartRect = LayoutLegend();
      cri.plotAreaRendererInfo.Rect = chartRect;
      double edge = Math.Min(chartRect.Width, chartRect.Height);
      cri.plotAreaRendererInfo.X += (chartRect.Width - edge) / 2;
      cri.plotAreaRendererInfo.Y += (chartRect.Height - edge) / 2;
      cri.plotAreaRendererInfo.Width = edge;
      cri.plotAreaRendererInfo.Height = edge;

      DataLabelRenderer dlr = new PieDataLabelRenderer(this.rendererParms);
      dlr.Format();

      // Calculated remaining plot area, now it's safe to format.
      PlotAreaRenderer renderer = GetPlotAreaRenderer();
      renderer.Format();

      dlr.CalcPositions();
    }

    /// <summary>
    /// Draws the pie chart.
    /// </summary>
    internal override void Draw()
    {
      LegendRenderer lr = new PieLegendRenderer(this.rendererParms);
      lr.Draw();

      WallRenderer wr = new WallRenderer(this.rendererParms);
      wr.Draw();

      PlotAreaBorderRenderer pabr = new PlotAreaBorderRenderer(this.rendererParms);
      pabr.Draw();

      PlotAreaRenderer renderer = GetPlotAreaRenderer();
      renderer.Draw();

      DataLabelRenderer dlr = new PieDataLabelRenderer(this.rendererParms);
      dlr.Draw();
    }

    /// <summary>
    /// Returns the specific plot area renderer.
    /// </summary>
    private PlotAreaRenderer GetPlotAreaRenderer()
    {
      Chart chart = (Chart)this.rendererParms.DrawingItem;
      switch (chart.type)
      {
        case ChartType.Pie2D:
          return new PieClosedPlotAreaRenderer(this.rendererParms);

        case ChartType.PieExploded2D:
          return new PieExplodedPlotAreaRenderer(this.rendererParms);
      }
      return null;
    }

    /// <summary>
    /// Initializes all necessary data to draw a series for a pie chart.
    /// </summary>
    protected void InitSeries(ChartRendererInfo rendererInfo)
    {
      SeriesCollection seriesColl = rendererInfo.chart.SeriesCollection;
      rendererInfo.seriesRendererInfos = new SeriesRendererInfo[seriesColl.Count];
      for (int idx = 0; idx < seriesColl.Count; ++idx)
      {
        SeriesRendererInfo sri = new SeriesRendererInfo();
        rendererInfo.seriesRendererInfos[idx] = sri;
        sri.series = seriesColl[idx];

        sri.LineFormat = Converter.ToXPen(sri.series.lineFormat, XColors.Black, ChartRenderer.DefaultSeriesLineWidth);
        sri.FillFormat = Converter.ToXBrush(sri.series.fillFormat, ColumnColors.Item(idx));

        sri.pointRendererInfos = new SectorRendererInfo[sri.series.seriesElements.Count];
        for (int pointIdx = 0; pointIdx < sri.pointRendererInfos.Length; ++pointIdx)
        {
          PointRendererInfo pri = new SectorRendererInfo();
          Point point = sri.series.seriesElements[pointIdx];
          pri.point = point;
          if (point != null)
          {
            pri.LineFormat = sri.LineFormat;
            if (point.lineFormat != null && !point.lineFormat.color.IsEmpty)
              pri.LineFormat = new XPen(point.lineFormat.color);
            if (point.fillFormat != null && !point.fillFormat.color.IsEmpty)
              pri.FillFormat = new XSolidBrush(point.fillFormat.color);
            else
              pri.FillFormat = new XSolidBrush(PieColors.Item(pointIdx));
            pri.LineFormat.LineJoin = XLineJoin.Round;
          }
          sri.pointRendererInfos[pointIdx] = pri;
        }
      }
    }
  }
}
