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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| <Application x:Class="DataVirtualization.App" | ||
| xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | ||
| xmlns:local="clr-namespace:DataVirtualization" | ||
| StartupUri="MainWindow.xaml"> | ||
| <Application.Resources> | ||
|
|
||
| </Application.Resources> | ||
| </Application> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Configuration; | ||
| using System.Data; | ||
| using System.Linq; | ||
| using System.Windows; | ||
|
|
||
| namespace DataVirtualization | ||
| { | ||
| /// <summary> | ||
| /// Interaction logic for App.xaml | ||
| /// </summary> | ||
| public partial class App : Application | ||
| { | ||
| } | ||
| } |
105 changes: 105 additions & 0 deletions
105
ChartView/WPF/DataVirtualization/ChartDataVirtualizationViewModel.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| using System; | ||
| using System.Collections.ObjectModel; | ||
| using System.Linq; | ||
| using Telerik.Windows.Controls; | ||
|
|
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| namespace DataVirtualization | ||
| { | ||
| public class ChartDataVirtualizationViewModel : ViewModelBase | ||
| { | ||
| private const int FullDataCount = 1000000; | ||
| private const double RangeOffset = 0.01; | ||
| private static Random randomNumberGenerator = new Random(); | ||
|
|
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| private ObservableCollection<PlotInfo> fullData; | ||
| private ObservableCollection<PlotInfo> visibleData; | ||
| private double minimumX; | ||
| private double maximumX; | ||
|
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| public ChartDataVirtualizationViewModel() | ||
| { | ||
| this.fullData = this.GenerateFullData(); | ||
| this.MinimumX = this.fullData.FirstOrDefault().XValue; | ||
| this.MaximumX = this.fullData.LastOrDefault().XValue; | ||
| this.visibleData = new ObservableCollection<PlotInfo>(); | ||
| } | ||
|
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| public double MinimumX | ||
| { | ||
| get { return this.minimumX; } | ||
| set | ||
| { | ||
| if (this.minimumX != value) | ||
| { | ||
| this.minimumX = value; | ||
| this.OnPropertyChanged("MinimumX"); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public double MaximumX | ||
| { | ||
| get { return this.maximumX; } | ||
| set | ||
| { | ||
| if (this.maximumX != value) | ||
| { | ||
| this.maximumX = value; | ||
| this.OnPropertyChanged("MaximumX"); | ||
| } | ||
| } | ||
| } | ||
|
|
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| public ObservableCollection<PlotInfo> FullData | ||
| { | ||
| get { return this.fullData; } | ||
| } | ||
|
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| public ObservableCollection<PlotInfo> VisibleData | ||
| { | ||
| get { return this.visibleData; } | ||
| private set | ||
| { | ||
| if (this.visibleData != value) | ||
| { | ||
| this.visibleData = value; | ||
| this.OnPropertyChanged("VisibleData"); | ||
| } | ||
| } | ||
| } | ||
|
|
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| public void UpdateVisibleData(double minimum, double maximum) | ||
| { | ||
| double delta = maximum - minimum; | ||
| double offset = delta * RangeOffset; | ||
| double offsetMinimum = minimum - offset; | ||
| double offsetMaximum = maximum + offset; | ||
|
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| this.VisibleData = this.GetVisibleItems(offsetMinimum, offsetMaximum); | ||
| } | ||
|
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| private ObservableCollection<PlotInfo> GetVisibleItems(double minimum, double maximum) | ||
| { | ||
| ObservableCollection<PlotInfo> result = new ObservableCollection<PlotInfo>(); | ||
| for (int i = 0; i < this.fullData.Count; i++) | ||
| { | ||
| PlotInfo info = this.fullData[i]; | ||
| if (minimum <= info.XValue && info.XValue <= maximum) | ||
| { | ||
| result.Add(info); | ||
| } | ||
| } | ||
| return result; | ||
| } | ||
|
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| private ObservableCollection<PlotInfo> GenerateFullData() | ||
| { | ||
| ObservableCollection<PlotInfo> result = new ObservableCollection<PlotInfo>(); | ||
| for (int i = 0; i < FullDataCount; i++) | ||
| { | ||
| result.Add(new PlotInfo() { XValue = i, YValue = randomNumberGenerator.Next(100, 300) }); | ||
| } | ||
| return result; | ||
| } | ||
| } | ||
| } |
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