#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 gridlines used by bar charts, i. e. X axis grid will be rendered
  /// from left to right and Y axis grid will be rendered from top to bottom of the plot area.
  /// </summary>
  internal class BarGridlinesRenderer : GridlinesRenderer
  {
    /// <summary>
    /// Initializes a new instance of the BarGridlinesRenderer class with the
    /// specified renderer parameters.
    /// </summary>
    internal BarGridlinesRenderer(RendererParameters parms) : base(parms)
    {
    }

    /// <summary>
    /// Draws the gridlines into the plot area.
    /// </summary>
    internal override void Draw()
    {
      ChartRendererInfo cri = (ChartRendererInfo)this.rendererParms.RendererInfo;

      XRect plotAreaRect = cri.plotAreaRendererInfo.Rect;
      if (plotAreaRect.IsEmpty)
        return;

      AxisRendererInfo xari = cri.xAxisRendererInfo;
      AxisRendererInfo yari = cri.yAxisRendererInfo;

      double xMin = xari.MinimumScale;
      double xMax = xari.MaximumScale;
      double yMin = yari.MinimumScale;
      double yMax = yari.MaximumScale;
      double xMajorTick = xari.MajorTick;
      double yMajorTick = yari.MajorTick;
      double xMinorTick = xari.MinorTick;
      double yMinorTick = yari.MinorTick;
      double xMaxExtension = xari.MajorTick;

      XMatrix matrix = cri.plotAreaRendererInfo.matrix;

      LineFormatRenderer lineFormatRenderer;
      XGraphics gfx = this.rendererParms.Graphics;

      XPoint[] points = new XPoint[2];
      if (xari.MinorGridlinesLineFormat != null)
      {
        lineFormatRenderer = new LineFormatRenderer(gfx, xari.MinorGridlinesLineFormat);
        for (double x = xMin + xMinorTick; x < xMax; x += xMinorTick)
        {
          points[0].Y = x;
          points[0].X = yMin;
          points[1].Y = x;
          points[1].X = yMax;
          matrix.TransformPoints(points);
          lineFormatRenderer.DrawLine(points[0], points[1]);
        }
      }

      if (xari.MajorGridlinesLineFormat != null)
      {
        lineFormatRenderer = new LineFormatRenderer(gfx, xari.MajorGridlinesLineFormat);
        for (double x = xMin; x <= xMax; x += xMajorTick)
        {
          points[0].Y = x;
          points[0].X = yMin;
          points[1].Y = x;
          points[1].X = yMax;
          matrix.TransformPoints(points);
          lineFormatRenderer.DrawLine(points[0], points[1]);
        }
      }

      if (yari.MinorGridlinesLineFormat != null)
      {
        lineFormatRenderer = new LineFormatRenderer(gfx, yari.MinorGridlinesLineFormat);
        for (double y = yMin + yMinorTick; y < yMax; y += yMinorTick)
        {
          points[0].Y = xMin;
          points[0].X = y;
          points[1].Y = xMax;
          points[1].X = y;
          matrix.TransformPoints(points);
          lineFormatRenderer.DrawLine(points[0], points[1]);
        }
      }

      if (yari.MajorGridlinesLineFormat != null)
      {
        lineFormatRenderer = new LineFormatRenderer(gfx, yari.MajorGridlinesLineFormat);
        for (double y = yMin; y <= yMax; y += yMajorTick)
        {
          points[0].Y = xMin;
          points[0].X = y;
          points[1].Y = xMax;
          points[1].X = y;
          matrix.TransformPoints(points);
          lineFormatRenderer.DrawLine(points[0], points[1]);
        }
      }
    }
  }
}
