182 lines
8.0 KiB
C#
182 lines
8.0 KiB
C#
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#region PDFsharp Charting - A .NET charting library based on PDFsharp
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//
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// Authors:
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// Niklas Schneider
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using PdfSharp.Drawing;
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namespace PdfSharp.Charting.Renderers
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{
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/// <summary>
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/// Represents a data label renderer for pie charts.
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/// </summary>
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internal class PieDataLabelRenderer : DataLabelRenderer
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{
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/// <summary>
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/// Initializes a new instance of the PieDataLabelRenderer class with the
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/// specified renderer parameters.
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/// </summary>
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internal PieDataLabelRenderer(RendererParameters parms)
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: base(parms)
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{ }
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/// <summary>
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/// Calculates the space used by the data labels.
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/// </summary>
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internal override void Format()
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{
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ChartRendererInfo cri = (ChartRendererInfo)_rendererParms.RendererInfo;
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if (cri.seriesRendererInfos.Length == 0)
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return;
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SeriesRendererInfo sri = cri.seriesRendererInfos[0];
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if (sri._dataLabelRendererInfo == null)
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return;
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double sumValues = sri.SumOfPoints;
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XGraphics gfx = _rendererParms.Graphics;
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sri._dataLabelRendererInfo.Entries = new DataLabelEntryRendererInfo[sri._pointRendererInfos.Length];
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int index = 0;
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foreach (SectorRendererInfo sector in sri._pointRendererInfos)
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{
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DataLabelEntryRendererInfo dleri = new DataLabelEntryRendererInfo();
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if (sri._dataLabelRendererInfo.Type != DataLabelType.None)
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{
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if (sri._dataLabelRendererInfo.Type == DataLabelType.Percent)
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{
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double percent = 100 / (sumValues / Math.Abs(sector.Point._value));
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dleri.Text = percent.ToString(sri._dataLabelRendererInfo.Format) + "%";
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}
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else if (sri._dataLabelRendererInfo.Type == DataLabelType.Value)
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dleri.Text = sector.Point._value.ToString(sri._dataLabelRendererInfo.Format);
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if (dleri.Text.Length > 0)
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dleri.Size = gfx.MeasureString(dleri.Text, sri._dataLabelRendererInfo.Font);
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}
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sri._dataLabelRendererInfo.Entries[index++] = dleri;
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}
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}
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/// <summary>
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/// Draws the data labels of the pie chart.
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/// </summary>
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internal override void Draw()
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{
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ChartRendererInfo cri = (ChartRendererInfo)_rendererParms.RendererInfo;
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if (cri.seriesRendererInfos.Length == 0)
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return;
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SeriesRendererInfo sri = cri.seriesRendererInfos[0];
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if (sri == null || sri._dataLabelRendererInfo == null)
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return;
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XGraphics gfx = _rendererParms.Graphics;
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XFont font = sri._dataLabelRendererInfo.Font;
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XBrush fontColor = sri._dataLabelRendererInfo.FontColor;
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XStringFormat format = XStringFormats.Center;
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format.LineAlignment = XLineAlignment.Center;
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foreach (DataLabelEntryRendererInfo dataLabel in sri._dataLabelRendererInfo.Entries)
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{
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if (dataLabel.Text != null)
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gfx.DrawString(dataLabel.Text, font, fontColor, dataLabel.Rect, format);
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}
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}
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/// <summary>
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/// Calculates the data label positions specific for pie charts.
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/// </summary>
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internal override void CalcPositions()
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{
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ChartRendererInfo cri = (ChartRendererInfo)_rendererParms.RendererInfo;
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XGraphics gfx = _rendererParms.Graphics;
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if (cri.seriesRendererInfos.Length > 0)
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{
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SeriesRendererInfo sri = cri.seriesRendererInfos[0];
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if (sri != null && sri._dataLabelRendererInfo != null)
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{
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int sectorIndex = 0;
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foreach (SectorRendererInfo sector in sri._pointRendererInfos)
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{
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// Determine output rectangle
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double midAngle = sector.StartAngle + sector.SweepAngle / 2;
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double radMidAngle = midAngle / 180 * Math.PI;
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XPoint origin = new XPoint(sector.Rect.X + sector.Rect.Width / 2,
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sector.Rect.Y + sector.Rect.Height / 2);
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double radius = sector.Rect.Width / 2;
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double halfradius = radius / 2;
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DataLabelEntryRendererInfo dleri = sri._dataLabelRendererInfo.Entries[sectorIndex++];
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switch (sri._dataLabelRendererInfo.Position)
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{
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case DataLabelPosition.OutsideEnd:
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// Outer border of the circle.
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dleri.X = origin.X + (radius * Math.Cos(radMidAngle));
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dleri.Y = origin.Y + (radius * Math.Sin(radMidAngle));
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if (dleri.X < origin.X)
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dleri.X -= dleri.Width;
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if (dleri.Y < origin.Y)
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dleri.Y -= dleri.Height;
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break;
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case DataLabelPosition.InsideEnd:
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// Inner border of the circle.
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dleri.X = origin.X + (radius * Math.Cos(radMidAngle));
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dleri.Y = origin.Y + (radius * Math.Sin(radMidAngle));
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if (dleri.X > origin.X)
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dleri.X -= dleri.Width;
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if (dleri.Y > origin.Y)
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dleri.Y -= dleri.Height;
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break;
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case DataLabelPosition.Center:
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// Centered
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dleri.X = origin.X + (halfradius * Math.Cos(radMidAngle));
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dleri.Y = origin.Y + (halfradius * Math.Sin(radMidAngle));
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dleri.X -= dleri.Width / 2;
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dleri.Y -= dleri.Height / 2;
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break;
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case DataLabelPosition.InsideBase:
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// Aligned at the base/center of the circle
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dleri.X = origin.X;
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dleri.Y = origin.Y;
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if (dleri.X < origin.X)
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dleri.X -= dleri.Width;
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if (dleri.Y < origin.Y)
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dleri.Y -= dleri.Height;
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break;
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}
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}
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}
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}
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}
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}
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}
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