WPF图表Live Charts（三）柱状图_livecharts柱状图

简介

前面介绍了Live Charts的基础和设置，接下介绍一下如何实现一个柱状图。该柱状图主要实现打开多个文件，读取文件的多个数据并显示的功能。

效果预览

打开多个数据文件，同时读取文件的文件的大小，文件的的温度数据，分两个Y轴显示，同时有各自的单位。

前台代码

<Grid >
        <lvc:CartesianChart Series="{Binding SeriesCollection}" LegendLocation="Top">
            <lvc:CartesianChart.AxisX>
                <lvc:Axis Title="fielname" Labels="{Binding Labels}" FontSize="14"></lvc:Axis>
            </lvc:CartesianChart.AxisX>
            <lvc:CartesianChart.AxisY>
                <lvc:Axis x:Name="axisT"  LabelFormatter="{Binding FormatterT}" Foreground="DodgerBlue" FontSize="14" />
                <lvc:Axis x:Name="axisS"  LabelFormatter="{Binding FormatterS}" Foreground="IndianRed" Position="RightTop" FontSize="14" />
            </lvc:CartesianChart.AxisY>
        </lvc:CartesianChart>
        <Button x:Name="button_open" Content="open" HorizontalAlignment="Right" VerticalAlignment="Top" Width="40" Click="button_openClick" 
                Background="{x:Null}" BorderBrush="{DynamicResource {x:Static SystemColors.HotTrackBrushKey}}" 
                Foreground="{DynamicResource {x:Static SystemColors.HotTrackBrushKey}}" Opacity="0.5" Height="20"/>
    </Grid>
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后台代码

   public partial class MainWindow : Window
    {
        public Func<double, string> FormatterT { get; set; }
        public Func<double, string> FormatterS { get; set; }
        public SeriesCollection SeriesCollection { get; set; }
        public string[] Labels { get; set; }

        List<double> filesize = new List<double>();
        List<string> filenames = new List<string>();
        List<double> temperature = new List<double>();

        //新建一条文件大小的柱状图
        ColumnSeries sizeseries = new ColumnSeries();
        //新建一条温度的柱状图
        ColumnSeries templeseries = new ColumnSeries();
        public MainWindow()
        {			
            InitializeComponent();

            //添加两个纵坐标的单位
            FormatterT = value => value + "C°";
            FormatterS = value => value + "KB";

            templeseries.Title = "temp";
            //温度的柱状图依赖于第一条纵坐标
            templeseries.ScalesYAt = 0;
            axisT.Title = "temp/C°";

            sizeseries.Title = "size";
            //文件大小的柱状图依赖于第二条纵坐标
            sizeseries.ScalesYAt = 1;
            axisS.Title = "size/KB";

            SeriesCollection = new SeriesCollection { };
            SeriesCollection.Add(templeseries);
            SeriesCollection.Add(sizeseries);
            
            //绑定数据
            DataContext = this;
        }
        public  void button_openClick(object sender, RoutedEventArgs e)
        {
            filenames.Clear();
            filesize.Clear();
            temperature.Clear();
            OpenFileDialog open_files = new OpenFileDialog();
            //打开多个文件
            open_files.Multiselect = true;
            if (open_files.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                foreach (string file in open_files.FileNames)
                {
                    FileInfo MyFileInfo = new FileInfo(file);
                    //获取文件的大小
                    filesize.Add((int )MyFileInfo.Length/1024  );
                    //获取文件的名称
                    filenames.Add (System.IO.Path.GetFileNameWithoutExtension(file));
                    //通过正则表达式获取文件中的数据信息
                    StreamReader sr = new StreamReader(file);
                    string pattern = @"DHT11 temp:([0-9]+(.[0-9]{1,3})?),";
                    string line;
                    while ((line = sr.ReadLine()) != null)
                    {
                        Regex r = new Regex(pattern , RegexOptions.None);
                        Match mc = r.Match(line );
                        string tempStr = mc.Groups[1].Value;
                        temperature.Add (Convert.ToDouble (tempStr));
                        break;
                    }
                    sr.Close();
                }         
            }
            Labels = filenames.ToArray();
            templeseries.Values = new ChartValues<double>(temperature);
            sizeseries.Values = new ChartValues<double>(filesize);
        }     
    }
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