public RenderTriangles()
        {
            var spliter = new Splitter()
            {
                SplitterBackground = Color.Gray,
                SplitterDistance   = 200
            };

            AddChild(spliter);

            var leftSideTopToBottom = new FlowLayoutWidget()
            {
                HAnchor = HAnchor.Stretch,
                VAnchor = VAnchor.Stretch,
            };

            spliter.Panel1.AddChild(leftSideTopToBottom);

            textWidget = new TextEditWidget(pixelWidth: 200)
            {
                VAnchor   = VAnchor.Stretch,
                HAnchor   = HAnchor.Stretch,
                Multiline = true,
                Margin    = 3,
            };

            leftSideTopToBottom.AddChild(textWidget);

            spliter.AddChild(new VerticalLine());

            var triangleRenderer = new TriangleRenderer()
            {
                HAnchor = HAnchor.Stretch,
                VAnchor = VAnchor.Stretch
            };

            spliter.Panel2.AddChild(triangleRenderer);

            textWidget.TextChanged += (sender, e) =>
            {
                var poly     = new List <Vector2>();
                var polygons = new List <List <Vector2> >();
                polygons.Add(poly);

                var lines = textWidget.Text.Split('\n');
                foreach (var line in lines)
                {
                    if (string.IsNullOrEmpty(line))
                    {
                        poly = new List <Vector2>();
                        polygons.Add(poly);
                    }
                    else
                    {
                        var parts = line.Split(',');
                        if (parts.Length == 2)
                        {
                            if (double.TryParse(parts[0], out double x) && double.TryParse(parts[1], out double y))
                            {
                                poly.Add(new Vector2(x, y));
                            }
                        }
                    }
                }

                triangleRenderer.Polygons = polygons;
                SaveFile();
                Invalidate();
            };

            textWidget.Text = LoadFile();

            triangleRenderer.Invalidate();

            AnchorAll();
        }