Code
public partial class J : Window
    {
        public J()
        {
            InitializeComponent();
            canvas1.RenderTransformOrigin = new Point(.5, .5);
            //画线
            ggg.MouseWheel += new MouseWheelEventHandler(ggg_MouseWheel);
        }

        double dc = 1.0;
        void ggg_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (e.Delta > 0)dc *= 1.25;
            else  dc *= 0.75;
            ScaleTransform trs = new ScaleTransform(dc, dc);
            canvas1.RenderTransform = trs;
        }
        
        //为了方便 点就写死了，前台的Canvas 高=700 宽=1200
        List<PointCollection> CreatData(int lineNum)
        {
            List<PointCollection> data = new List<PointCollection>();
            for (int i = 0; i < lineNum; i++)
            {
                PointCollection pc = new PointCollection();
                for (int j = 0; j < 600; j+=2)
                {
                    Random ri = new Random(i);
                    Random rj = new Random(ri.Next() + j);
                    Point p = new Point(rj.Next(1000 / lineNum * i, 1000 / lineNum * (i + 1)), j);
                    pc.Add(p);
                }
                data.Add(pc);
            }
            return data;
        }

        int lineNum = 50;
        private void radioButton1_Checked(object sender, RoutedEventArgs e)
        { lineNum = 50;}

        private void radioButton2_Checked(object sender, RoutedEventArgs e)
        { lineNum = 500;}

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            this.canvas1.Children.Clear();
            List<PointCollection> datas = CreatData(lineNum);
            foreach (PointCollection pc in datas)
            {
                Polyline pline = new Polyline();
                pline.IsHitTestVisible = false;
                pline.StrokeThickness = 0.5;
                pline.Stroke = Brushes.Black;
                pline.Points = pc;
                this.canvas1.Children.Add(pline);
            }
        }
    }