WPF 290万数据点走势曲线图绘制及水平滚动条实现

以下是一个简单的WPF走势曲线图代码，其中包含了水平滚动条的实现：

XAML代码：

<Window x:Class='WpfApp1.MainWindow'
        xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
        Title='MainWindow' Height='450' Width='800'>
    <Grid>
        <ScrollViewer VerticalScrollBarVisibility='Auto' HorizontalScrollBarVisibility='Auto'>
            <Canvas Name='canvas' Width='3000' Height='3000'/>
        </ScrollViewer>
    </Grid>
</Window>

C#代码：

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        private const int DataCount = 2900000;
        private const double XScale = 0.1;
        private const double YScale = 0.1;
        private const double Margin = 50;
        private const double PointRadius = 2;

        private double[] xData = new double[DataCount];
        private double[] yData = new double[DataCount];

        public MainWindow()
        {
            InitializeComponent();

            // 生成测试数据
            Random random = new Random();
            for (int i = 0; i < DataCount; i++)
            {
                xData[i] = i * XScale;
                yData[i] = random.NextDouble() * 100 * YScale;
            }

            // 绘制坐标轴
            DrawAxis();

            // 绘制曲线
            DrawCurve();
        }

        private void DrawAxis()
        {
            // 绘制X轴
            Line xLine = new Line
            {
                X1 = Margin,
                Y1 = canvas.Height - Margin,
                X2 = canvas.Width - Margin,
                Y2 = canvas.Height - Margin,
                Stroke = Brushes.Black,
                StrokeThickness = 1
            };
            canvas.Children.Add(xLine);

            // 绘制Y轴
            Line yLine = new Line
            {
                X1 = Margin,
                Y1 = canvas.Height - Margin,
                X2 = Margin,
                Y2 = Margin,
                Stroke = Brushes.Black,
                StrokeThickness = 1
            };
            canvas.Children.Add(yLine);

            // 绘制X轴刻度
            for (int i = 0; i < DataCount; i += 100)
            {
                double x = i * XScale;
                Line tick = new Line
                {
                    X1 = x + Margin,
                    Y1 = canvas.Height - Margin,
                    X2 = x + Margin,
                    Y2 = canvas.Height - Margin + 5,
                    Stroke = Brushes.Black,
                    StrokeThickness = 1
                };
                canvas.Children.Add(tick);
            }

            // 绘制Y轴刻度
            for (int i = 0; i < 100; i += 10)
            {
                double y = i * YScale;
                Line tick = new Line
                {
                    X1 = Margin,
                    Y1 = canvas.Height - Margin - y,
                    X2 = Margin - 5,
                    Y2 = canvas.Height - Margin - y,
                    Stroke = Brushes.Black,
                    StrokeThickness = 1
                };
                canvas.Children.Add(tick);
            }
        }

        private void DrawCurve()
        {
            Polyline curve = new Polyline
            {
                Stroke = Brushes.Red,
                StrokeThickness = 1
            };

            for (int i = 0; i < DataCount; i++)
            {
                double x = xData[i];
                double y = yData[i];
                Point point = new Point(Margin + x, canvas.Height - Margin - y);
                curve.Points.Add(point);
            }

            canvas.Children.Add(curve);
        }
    }
}

这段代码会生成一个带有水平滚动条的窗口，其中包含了一条随机生成的走势曲线。X轴表示数据的序号，Y轴表示数据的值。水平滚动条可以让用户在横向上滚动窗口，查看曲线的不同部分。

注意：

• 此代码示例仅用于演示，实际应用中需要根据实际数据进行调整。
• 290万数据点的绘制可能会导致性能问题，需要优化代码和图形渲染方式。
• 可以通过添加事件处理程序来实现鼠标悬停显示数据等功能。
• 还可以考虑使用其他图表库来实现更强大的数据可视化功能。