#region PDFsharp Charting - A .NET charting library based on PDFsharp
//
// Authors:
//   Niklas Schneider
//
// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (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 PdfSharp.Drawing;

namespace PdfSharp.Charting.Renderers
{
    /// <summary>
    /// Represents the base for all pie plot area renderer.
    /// </summary>
    internal abstract class PiePlotAreaRenderer : PlotAreaRenderer
    {
        /// <summary>
        /// Initializes a new instance of the PiePlotAreaRenderer class
        /// with the specified renderer parameters.
        /// </summary>
        internal PiePlotAreaRenderer(RendererParameters parms)
            : base(parms)
        { }

        /// <summary>
        /// Layouts and calculates the space used by the pie plot area.
        /// </summary>
        internal override void Format()
        {
            CalcSectors();
        }

        /// <summary>
        /// Draws the content of the pie plot area.
        /// </summary>
        internal override void Draw()
        {
            ChartRendererInfo cri = (ChartRendererInfo)_rendererParms.RendererInfo;
            XRect plotAreaRect = cri.plotAreaRendererInfo.Rect;
            if (plotAreaRect.IsEmpty)
                return;

            if (cri.seriesRendererInfos.Length == 0)
                return;

            XGraphics gfx = _rendererParms.Graphics;
            XGraphicsState state = gfx.Save();

            // Draw sectors.
            SeriesRendererInfo sri = cri.seriesRendererInfos[0];
            foreach (SectorRendererInfo sector in sri._pointRendererInfos)
            {
                if (!double.IsNaN(sector.StartAngle) && !double.IsNaN(sector.SweepAngle))
                    gfx.DrawPie(sector.FillFormat, sector.Rect, sector.StartAngle, sector.SweepAngle);
            }

            // Draw border of the sectors.
            foreach (SectorRendererInfo sector in sri._pointRendererInfos)
            {
                if (!double.IsNaN(sector.StartAngle) && !double.IsNaN(sector.SweepAngle))
                    gfx.DrawPie(sector.LineFormat, sector.Rect, sector.StartAngle, sector.SweepAngle);
            }

            gfx.Restore(state);
        }

        /// <summary>
        /// Calculates the specific positions for each sector.
        /// </summary>
        protected abstract void CalcSectors();
    }
}