填充2条曲线和2条线之间的区域

Question

我有一条曲线/线网格。我想用不同的颜色填充线之间的每个空间。 这是我绘制网格的代码。

 private void DrawBezierGrid()
    {

        List<Point> startPoints = new List<Point>();
        List<Point> controlPoints1 = new List<Point>();
        List<Point> controlPoints2 = new List<Point>();
        List<Point> endPoints = new List<Point>();

        List<Path> paths = new List<Path>();
        List<Line> lines = new List<Line>();

        for (int i = 0; i < 10; i++)
        {
            startPoints.Add(new Point(i * 40, 0));
            controlPoints1.Add(new Point(i * 40, 200));
            controlPoints2.Add(new Point(100 + (i * 40), 200));
            endPoints.Add(new Point(100 + (i * 40), 400));
        }

        for (int i = 0; i < 10; i++)
        {
            Path path = new Path();
            path.Stroke = new SolidColorBrush(Colors.Blue);
            path.StrokeThickness = 1;

            PathGeometry path_geometry = new PathGeometry();
            path.Data = path_geometry;

            PathFigure path_figure = new PathFigure();
            path_geometry.Figures.Add(path_figure);

            path_figure.StartPoint = startPoints[i];

            PathSegmentCollection path_segment_collection = new PathSegmentCollection();
            path_figure.Segments = path_segment_collection;

            BezierSegment bezier_segment = new BezierSegment();
            bezier_segment.Point1 = controlPoints1[i];
            bezier_segment.Point2 = controlPoints2[i];
            bezier_segment.Point3 = endPoints[i];

            path_segment_collection.Add(bezier_segment);

            canvas.Children.Add(path);
            paths.Add(path);
        }


        for (int i = 0; i < 11; i++)
        {
            Line line = new Line();
            line.Stroke = new SolidColorBrush(Colors.Black);
            line.StrokeThickness = 1;
            line.X1 = 0;
            line.X2 = 400;
            line.Y1 = i * 40;
            line.Y2 = i * 40;

            canvas.Children.Add(line);
            lines.Add(line);
        }
    }

，结果是这样的

我想从线列表中选择2条相邻线，从路径列表中选择2条相邻曲线，然后填充这4条曲线/线之间的区域

我该怎么做？