#region PDFsharp Charting - A .NET charting library based on PDFsharp
//
// Authors:
//   Niklas Schneider (mailto:Niklas.Schneider@pdfsharp.com)
//
// Copyright (c) 2005-2007 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 System.Diagnostics;
using PdfSharp.Drawing;

namespace PdfSharp.Charting.Renderers
{
  /// <summary>
  /// Represents a plot area renderer of stacked columns, i. e. all columns are drawn one on another.
  /// </summary>
  internal class ColumnStackedPlotAreaRenderer : ColumnPlotAreaRenderer
  {
    /// <summary>
    /// Initializes a new instance of the ColumnStackedPlotAreaRenderer class with the
    /// specified renderer parameters.
    /// </summary>
    internal ColumnStackedPlotAreaRenderer(RendererParameters parms) : base(parms)
    {
    }

    /// <summary>
    /// Calculates the position, width and height of each column of all series.
    /// </summary>
    protected override void CalcColumns()
    {
      ChartRendererInfo cri = (ChartRendererInfo)this.rendererParms.RendererInfo;
      if (cri.seriesRendererInfos.Length == 0)
        return;

      double xMin = cri.xAxisRendererInfo.MinimumScale;
      double xMajorTick = cri.xAxisRendererInfo.MajorTick;

      int maxPoints = 0;
      foreach (SeriesRendererInfo sri in cri.seriesRendererInfos)
        maxPoints = Math.Max(maxPoints, sri.series.seriesElements.Count);

      double x = xMin + xMajorTick / 2;

      // Space used by one column.
      double columnWidth = xMajorTick * 0.75 / 2;

      XPoint[] points = new XPoint[2];
      for (int pointIdx = 0; pointIdx < maxPoints; ++pointIdx)
      {
        // Set x to first clustered column for each series.
        double yMin = 0, yMax = 0, y0 = 0, y1 = 0;
        double x0 = x - columnWidth;
        double x1 = x + columnWidth;

        foreach (SeriesRendererInfo sri in cri.seriesRendererInfos)
        {
          if (sri.pointRendererInfos.Length <= pointIdx)
            break;

          ColumnRendererInfo column = (ColumnRendererInfo)sri.pointRendererInfos[pointIdx];
          if (column.point != null && !double.IsNaN(column.point.value))
          {
            double y = column.point.value;
            if (y < 0)
            {
              y0 = yMin + y;
              y1 = yMin;
              yMin += y;
            }
            else
            {
              y0 = yMax;
              y1 = yMax + y;
              yMax += y;
            }

            points[0].X = x0; // upper left
            points[0].Y = y1;
            points[1].X = x1; // lower right
            points[1].Y = y0;

            cri.plotAreaRendererInfo.matrix.TransformPoints(points);

            column.Rect = new XRect(points[0].X,
                                    points[0].Y,
                                    points[1].X - points[0].X,
                                    points[1].Y - points[0].Y);
          }
        }
        x++; // Next stacked column.
      }
    }

    /// <summary>
    /// Stacked columns are always inside.
    /// </summary>
    protected override bool IsDataInside(double yMin, double yMax, double yValue)
    {
      return true;
    }
  }
}
