添加项目文件。

Live-Charts-master/Core/SeriesAlgorithms/PieAlgorithm.cs

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+//The MIT License(MIT)
+
+//Copyright(c) 2016 Alberto Rodriguez & LiveCharts Contributors
+
+//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.
+
+using System.Linq;
+using LiveCharts.Definitions.Charts;
+using LiveCharts.Definitions.Points;
+using LiveCharts.Definitions.Series;
+
+namespace LiveCharts.SeriesAlgorithms
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <seealso cref="LiveCharts.SeriesAlgorithm" />
+    /// <seealso cref="LiveCharts.Definitions.Series.IPieSeries" />
+    public class PieAlgorithm : SeriesAlgorithm, IPieSeries
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PieAlgorithm"/> class.
+        /// </summary>
+        /// <param name="view">The view.</param>
+        public PieAlgorithm(ISeriesView view) : base(view)
+        {
+            PreferredSelectionMode= TooltipSelectionMode.SharedXValues;
+        }
+
+        /// <summary>
+        /// Updates this instance.
+        /// </summary>
+        public override void Update()
+        {
+            var pieChart = (IPieChart) View.Model.Chart.View;
+
+            var maxPushOut = View.Model.Chart.View.ActualSeries
+                .OfType<IPieSeriesView>()
+                .Select(x => x.PushOut)
+                .DefaultIfEmpty(0).Max();
+
+            var minDimension = Chart.DrawMargin.Width < Chart.DrawMargin.Height
+                ? Chart.DrawMargin.Width
+                : Chart.DrawMargin.Height;
+            minDimension -= 10 + maxPushOut;
+            minDimension = minDimension < 10 ? 10 : minDimension;
+            
+            var inner = pieChart.InnerRadius;
+
+            var startAt = pieChart.StartingRotationAngle > 360
+                ? 360
+                : (pieChart.StartingRotationAngle < 0
+                    ? 0
+                    : pieChart.StartingRotationAngle);
+
+            foreach (var chartPoint in View.ActualValues.GetPoints(View))
+            {
+                chartPoint.View = View.GetPointView(chartPoint,
+                    View.DataLabels
+                        ? View.GetLabelPointFormatter()(chartPoint)
+                        : null);
+
+                var pieSlice = (IPieSlicePointView) chartPoint.View;
+
+                var space = pieChart.InnerRadius +
+                            ((minDimension/2) - pieChart.InnerRadius)*((chartPoint.X + 1)/(View.Values.GetTracker(View).XLimit.Max + 1));
+
+                chartPoint.SeriesView = View;
+
+                pieSlice.Radius = space;
+                pieSlice.InnerRadius = inner;
+                pieSlice.Rotation = startAt + (chartPoint.StackedParticipation - chartPoint.Participation)*360;
+                pieSlice.Wedge = chartPoint.Participation*360 > 0 ? chartPoint.Participation*360 : 0;
+
+                chartPoint.View.DrawOrMove(null, chartPoint, 0, Chart);
+
+                inner = pieSlice.Radius;
+            }
+        }
+    }
+}