项目结构调整

Others/Live-Charts-master/Examples/Wpf/PieChart/DropDowns/DropDownViewModel.cs

@@ -0,0 +1,106 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Media;
+using LiveCharts;
+using LiveCharts.Helpers;
+using LiveCharts.Wpf;
+
+namespace Wpf.PieChart.DropDowns
+{
+    public class DropDownViewModel : INotifyPropertyChanged
+    {
+        private SeriesCollection _series;
+
+        public DropDownViewModel()
+        {
+            var navigation = new List<SeriesCollection>();
+            var initialValues = DataProvider.Values.ToArray();
+
+            Series = GroupSeriesByTheshold(content: initialValues, threshold: initialValues.Max() * .7);
+
+            SliceClickCommand = new DropDownCommand(dropDownPoint =>
+            {
+                //if the point has no content to display...
+                if (dropDownPoint.Content.Length == 1) return;
+
+                navigation.Add(Series.Select(x => new PieSeries
+                {
+                    Values = x.Values,
+                    Title = x.Title,
+                    Fill = ((Series) x).Fill
+                }).AsSeriesCollection());
+
+                Series = GroupSeriesByTheshold(content: dropDownPoint.Content, threshold: dropDownPoint.Content.Max() * .7);
+            });
+
+            GoBackCommand = new RelayCommand(() =>
+            {
+                if (!navigation.Any())return;
+                var previous = navigation.Last();
+                if(previous == null) return;
+                Series = previous;
+                navigation.Remove(previous);
+            });
+
+            Formatter = x => x.ToString("N1");
+        }
+
+        public SeriesCollection Series
+        {
+            get { return _series; }
+            set
+            {
+                _series = value;
+                OnPropertyChanged("Series");
+            }
+        }
+        public DropDownCommand SliceClickCommand { get; set; }
+        public RelayCommand GoBackCommand { get; set; }
+        public Func<double, string> Formatter { get; set; }
+        
+        private static SeriesCollection GroupSeriesByTheshold(double[] content, double threshold)
+        {
+            var series = content
+                .Where(x => x > threshold)
+                .Select((value, index) => new PieSeries
+                {
+                    Values = new ChartValues<DropDownPoint>
+                    {
+                        new DropDownPoint {Content = new[] {value}}
+                    },
+                    Title = "Series " + index
+                }).AsSeriesCollection();
+
+            var thresholdSeries = new PieSeries
+            {
+                Values = new ChartValues<DropDownPoint>
+                {
+                    new DropDownPoint
+                    {
+                        Content = content.Where(x => x < threshold).ToArray()
+                    }
+                },
+                Title = "DropDown Slice",
+                Fill = new SolidColorBrush(Color.FromRgb(30,30,30)),
+                PushOut = 5
+            };
+            series.Add(thresholdSeries);
+
+            return series;
+        }
+
+        #region INotifyPropertyChanged implementation
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected virtual void OnPropertyChanged(string propertyName)
+        {
+            var handler = PropertyChanged;
+            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        #endregion
+    }
+}