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DynamicDataDisplay 实时曲线图的使用和沿轴移动的效果
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原文地址
?由于項目需要，最近在找關于繪制實時曲線圖的文章，但看了很多自己實現(xiàn)的話太慢，所以使用了第三方控件來實現(xiàn)（由于是項目中使用所以我比較傾向與開源的項目，如果出問題的話可以很好的找到根源）。這里記錄是讓我以后可以回顧，也可以讓志同道合的程序猿減少搜索時間。
? ? ? ? 下面我們就介紹一下DynamicDataDisplay中實時曲線圖的功能（其他沒有時間去研究），由于在網上能找到類似的配置文章。
首先我們要去官網下載dll(或者直接NuGet,這里沒有用過就不介紹了），DynamicDataDisplay找到需要的DynamicDataDisplay.dll并在項目中引用
然后在項目中配置命名空間?xmlns:d3="http://research.microsoft.com/DynamicDataDisplay/1.0"，再在內容中添加<d3:ChartPlotter>基本配置問題就已經解決。
? ? ?CPU的使用率的實時顯示問題，CPU所使用的api可以自己去查找，我這里就不說明了。
? ? ?下面我們來直接貼代碼
MainWindow.xaml文件內容如下：
[html]?view plaincopy
<Window?xmlns:dxga="http://schemas.devexpress.com/winfx/2008/xaml/gauges"??????????xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"??????????xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"??????????x:Class="LinechartApplication.MainWindow"??????????Title="MainWindow"?Height="400"?Width="650"??????????xmlns:d3="http://research.microsoft.com/DynamicDataDisplay/1.0"?Loaded="Window_Loaded">??????<Grid>??????????<Grid.RowDefinitions>??????????????<RowDefinition?Height="Auto"/>??????????????<RowDefinition?Height="*"/>??????????</Grid.RowDefinitions>??????????<StackPanel?Orientation="Horizontal">??????????????<Button?Content="滾屏or不滾屏"??Click="Button_Click"/>??????????</StackPanel>??????????<d3:ChartPlotter?x:Name="plotter"?Margin="10,10,20,10"?Grid.Row="1">??????????????<d3:ChartPlotter.VerticalAxis>??????????????????<d3:VerticalIntegerAxis?/>??????????????</d3:ChartPlotter.VerticalAxis>????????????????<d3:ChartPlotter.HorizontalAxis>??????????????????<d3:HorizontalIntegerAxis?/>??????????????</d3:ChartPlotter.HorizontalAxis>????????????????<d3:Header?Content="CPU?實時性能"/>??????????????<d3:VerticalAxisTitle?Content="百分比"/>??????????</d3:ChartPlotter>??????</Grid>??</Window>??
[csharp]?view plaincopy
using?System;??using?System.Globalization;??using?System.IO;??using?System.Reflection;??using?System.Threading;??using?System.Windows;??using?System.Diagnostics;??using?System.Windows.Threading;??using?System.Windows.Media;??using?Microsoft.Research.DynamicDataDisplay;??using?Microsoft.Research.DynamicDataDisplay.DataSources;??using?System.Collections;????namespace?LinechartApplication??{??????///?<summary>??????///?MainWindow.xaml?的交互邏輯??????///?</summary>??????public?partial?class?MainWindow?:?Window??????{????????????private?ObservableDataSource<Point>?dataSource?=?new?ObservableDataSource<Point>();??????????private?PerformanceCounter?performanceCounter?=?new?PerformanceCounter();??????????private?DispatcherTimer?dispatcherTimer?=?new?DispatcherTimer();??????????private?int?currentSecond?=?0;????????????bool?buttonbool?=?false;//標志是否滾屏??????????public?MainWindow()??????????{??????????????InitializeComponent();????????????}????????????private?void?Window_Loaded(object?sender,?RoutedEventArgs?e)??????????{??????????????plotter.AddLineGraph(dataSource,?Colors.Red,?2,?"百分比");??????????????plotter.LegendVisible?=?true;??????????????dispatcherTimer.Interval?=?TimeSpan.FromSeconds(1);??????????????dispatcherTimer.Tick?+=?timer_Tick;??????????????dispatcherTimer.IsEnabled?=?true;??????????????plotter.Viewport.FitToView();??????????}????????????int?xaxis?=?0;??????????int?yaxis?=?0;??????????int?group?=?20;//默認組距????????????Queue?q?=?new?Queue();??????????private?void?timer_Tick(object?sender,?EventArgs?e)??????????{??????????????performanceCounter.CategoryName?=?"Processor";??????????????performanceCounter.CounterName?=?"%?Processor?Time";??????????????performanceCounter.InstanceName?=?"_Total";??????????????double?x?=?currentSecond;??????????????double?y?=?performanceCounter.NextValue();??????????????Point?point?=?new?Point(x,?y);??????????????dataSource.AppendAsync(base.Dispatcher,?point);??????????????if?(wendu)??????????????{??????????????????if?(q.Count?<?group)??????????????????{??????????????????????q.Enqueue((int)y);//入隊??????????????????????yaxis??=?0;??????????????????????foreach?(int?c?in?q)??????????????????????????if?(c?>?yaxis)??????????????????????????????yaxis?=?c;??????????????????}??????????????????else?{??????????????????????q.Dequeue();//出隊??????????????????????q.Enqueue((int)y);//入隊??????????????????????yaxis?=?0;??????????????????????foreach?(int?c?in?q)??????????????????????????if?(c?>?yaxis)??????????????????????????????yaxis?=?c;??????????????????}????????????????????if?(currentSecond?-?group?>?0)??????????????????????xaxis?=?currentSecond?-?group;??????????????????else??????????????????????xaxis?=?0;????????????????????Debug.Write("{0}\n",?yaxis.ToString());??????????????????plotter.Viewport.Visible?=?new?System.Windows.Rect(xaxis,?0,?group,?yaxis);//主要注意這里一行??????????????}??????????????currentSecond++;??????????}????????????private?void?Button_Click(object?sender,?RoutedEventArgs?e)??????????{??????????????if?(wendu)??????????????{??????????????????wendu?=?false;??????????????}??????????????else?{??????????????????wendu?=?true;??????????????}??????????}??????}??}??
DynamicDataDisplay實現(xiàn)實時顯示曲線的功能有很多但沒有看到x軸移動的功能所以下面就是主要內容（如何沿著x軸移動）在使用DynamicDataDisplay時候我發(fā)現(xiàn)會出現(xiàn)圖像縮放的情況（就是x軸一直被縮放，所有數(shù)據(jù)都會被壓縮在一塊，很不方便）。使用plotter.Viewport.Visible = new System.Windows.Rect(xaxis, 0, group, yaxis);這行代碼就可以解決按照x軸移動的功能。這個就像一個窗口，我們定義窗口位置和大小就能想看到我們所需要的數(shù)據(jù)。第一和第二個參數(shù)是原點坐標，第三個參數(shù)是X軸長度，第四個參數(shù)是Y長度。定義好了之后所有在這個區(qū)間的內容都會被顯示，多余的參數(shù)不顯示。隨著窗口的移動也就是X軸移動的功能。代碼中，使用了隊列，隊列的長度就等于顯示窗口的長度也就是X軸的長度。隊列的作用是取該隊列中最大的值來確定窗口的高度。
? 不滾屏時圖像（我們可以看到X軸都擠到一塊）
? 滾屏時圖像（我們可以看到X起始點和結束點）
? ? ??資源下載http://download.csdn.net/detail/u013187531/9842653
?
轉載于:https://www.cnblogs.com/nimorl/p/9156788.html
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