Visifire显示实时曲线图

前台代码：

<Window
    x:Class="WPFVisifireChartsApp.RealtimeLineGraph"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:WPFVisifireChartsApp"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:vc="clr-namespace:Visifire.Charts;assembly=WPFVisifire.Charts"
    Title="RealtimeLineGraph"
    Width="800"
    Height="450"
    mc:Ignorable="d">
    <Grid>
        <vc:Chart
            AnimatedUpdate="true"
            BorderBrush="Gray"
            BorderThickness="0.5"
            CornerRadius="7,7,0,0"
            ShadowEnabled="True"
            Theme="Theme1">

            <vc:Chart.Titles>
                <vc:Title FontSize="14" Text="实时曲线图" />
            </vc:Chart.Titles>

            <vc:Chart.Series>
                <vc:DataSeries
                    x:Name="ds"
                    LabelEnabled="True"
                    RenderAs="QuickLine" />
            </vc:Chart.Series>
        </vc:Chart>
    </Grid>
</Window>

后台代码：

using System;
using System.Windows;
using System.Windows.Threading;

namespace WPFVisifireChartsApp
{
    public partial class RealtimeLineGraph : Window
    {
        public RealtimeLineGraph()
        {
            InitializeComponent();

            ds.AutoFitToPlotArea = true;

            Random random = new Random();
            var index = 0;

            for (int i = 0; i < 1000; i++)
            {
                var pt = new Visifire.Charts.DataPoint();
                pt.XValue = index++;
                pt.YValue = random.NextDouble();
                ds.DataPoints.Add(pt);
            }

            DispatcherTimer timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromMilliseconds(100);
            timer.Tick += (s, e) =>
            {
                var pt = new Visifire.Charts.DataPoint();
                pt.XValue = index++;
                pt.YValue = random.NextDouble();
                ds.DataPoints.Add(pt);
            };
            timer.Start();

            this.Closing += (s, e) => timer.Stop();
        }
    }
}

运行一段时间以后，X轴会出现滚动条。滚动条本身可以拖动。
但是一屏内展示的曲线点实时有点少，不知道怎么样改变同一时间展示的点数。
因为同时展示的点比较少，倒是不卡，但不能说明这个性能就好。