#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 System.Diagnostics;
using PdfSharp.Drawing;

namespace PdfSharp.Charting.Renderers
{
  /// <summary>
  /// Represents a plot area renderer of clustered columns, i. e. all columns are drawn side by side.
  /// </summary>
  internal class ColumnClusteredPlotAreaRenderer : ColumnPlotAreaRenderer
  {
    /// <summary>
    /// Initializes a new instance of the ColumnClusteredPlotAreaRenderer class with the
    /// specified renderer parameters.
    /// </summary>
    internal ColumnClusteredPlotAreaRenderer(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 yMin = cri.yAxisRendererInfo.MinimumScale;
      double yMax = cri.yAxisRendererInfo.MaximumScale;

      int pointCount = 0;
      foreach (SeriesRendererInfo sr in cri.seriesRendererInfos)
        pointCount += sr.series.seriesElements.Count;

      // Space shared by one clustered column.
      double groupWidth = cri.xAxisRendererInfo.MajorTick;

      // Space used by one column.
      double columnWidth = groupWidth * 3 / 4 / cri.seriesRendererInfos.Length;

      int seriesIdx = 0;
      XPoint[] points = new XPoint[2];
      foreach (SeriesRendererInfo sri in cri.seriesRendererInfos)
      {
        // Set x to first clustered column for each series.
        double x = xMin + groupWidth / 2;
        
        // Offset for columns of a particular series from the start of a clustered cloumn.
        double dx = (columnWidth * seriesIdx) - (columnWidth / 2 * cri.seriesRendererInfos.Length);

        foreach (ColumnRendererInfo column in sri.pointRendererInfos)
        {
          if (column.point != null)
          {
            double x0 = x + dx;
            double x1 = x + dx + columnWidth;
            double y0 = yMin;
            double y1 = column.point.Value;

            // Draw from zero base line, if it exists.
            if (y0 < 0 && yMax >= 0)
              y0 = 0;

            // y0 should always be lower than y1, i. e. draw column from bottom to top.
            if (y1 < 0 && y1 < y0)
            {
              double y = y0;
              y0 = y1;
              y1 = 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 clustered column.
        }
        seriesIdx++;
      }
    }

    /// <summary>
    /// If yValue is within the range from yMin to yMax returns true, otherwise false.
    /// </summary>
    protected override bool IsDataInside(double yMin, double yMax, double yValue)
    {
      return yValue <= yMax && yValue >= yMin;
    }
  }
}
