wpf 应用程序

Question

怎样绘制一个波形，把从串口接收的数据 绘制成波形？我现在的方法的 实例化一个位图对象 在位图对象上绘制好以后 
再显示。现在碰到了个问题 我不知怎样绘制在位图对象上？ 求高手给点代码或给个其他的方法。

Answer 1

直接贴代码，
<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Image Height="200" HorizontalAlignment="Left" Margin="24,24,0,0" Name="image1"  VerticalAlignment="Top" Width="300" Loaded="image1_Loaded" />
    </Grid>
</Window>using System;
using System.Windows;
using System.Windows.Media.Imaging;
using System.Windows.Interop;
using System.Drawing;
using System.Drawing.Drawing2D;namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }        private void image1_Loaded(object sender, RoutedEventArgs e)
        {
            Bitmap bitmap = CreateSineWave();
            image1.Source = Imaging.CreateBitmapSourceFromHBitmap(
                bitmap.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
                BitmapSizeOptions.FromEmptyOptions());
        }        private Bitmap CreateSineWave()
        {
            const int delta = 20;
            var bitmap = new Bitmap(300, 200);
            using (var g = Graphics.FromImage(bitmap))
            {
                var path = new GraphicsPath();
                for (double a = 0; a < 4 * Math.PI; a += 0.2)
                {
                    double x1 = a * delta;
                    double y1 = Math.Sin(a) * delta + 100;
                    double x2 = (a + 0.1) * delta;
                    double y2 = Math.Sin(a + 0.1) * delta + 100;                    path.AddLine((float)x1, (float)y1, (float)x2, (float)y2);
                }
                g.DrawPath(new Pen(Color.Black), path);
            }            return bitmap;
        }
    }
}