Draw an empty table (table layout model)

//
// This code is part of Document Solutions for Imaging demos.
// Copyright (c) MESCIUS inc. All rights reserved.
//
using System;
using System.IO;
using System.Drawing;
using System.Numerics;
using GrapeCity.Documents.Drawing;
using GrapeCity.Documents.Text;
using GrapeCity.Documents.Imaging;
using GrapeCity.Documents.Layout;
using GrapeCity.Documents.Layout.Composition;
using GCTEXT = GrapeCity.Documents.Text;
using GCDRAW = GrapeCity.Documents.Drawing;
 
namespace DsImagingWeb.Demos
{
    // This example shows how to draw a simple empty table,
    // using the GrapeCity.Documents.Layout.Composition.Surface and
    // GrapeCity.Documents.Drawing.TableRenderer classes.
    // This example highlights the main elements of the table layout
    // that can be created using the TableRenderer class.
    public class EmptyTable
    {
        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)
        {
            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);
            using var g = bmp.CreateGraphics(Color.White);
            DrawTable(g, pixelSize.Width, pixelSize.Height);
            return bmp;
        }
 
        static readonly TextFormat FormatDesc = new TextFormat()
        {
            Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "segoeui.ttf")),
            FontSize = 24,
            FontSizeInGraphicUnits = true,
            ForeColor = Color.White
        };
 
        static void DrawTable(GcGraphics g, float pageWidth, float pageHeight)
        {
            var surf = new Surface();
            var view = surf.CreateView(pageWidth, pageHeight);
 
            // Fill the page with Gray color.
            view.CreateVisual((g, v) => {
                g.FillRectangle(v.AsRectF(), Color.Gray);
            }).LayoutRect.AnchorExact(null);
 
            var vTable = view.CreateVisual();
            var tableRect = vTable.LayoutRect;
            tableRect.AnchorTopLeftRight(null, 36, 36, 36);
 
            // The paddingAll parameter adds padding to the table grid relative to the table rectangle.
            var ta = new TableRenderer(g,
                tableRect, FixedTableSides.TopLeftRight,
                rowCount: 3,
                columnCount: 3,
                gridLineColor: Color.Yellow,
                gridLineWidth: 5,
                rowMinHeight: 100,
                paddingAll: 40);
 
            var columns = ta.ColumnRects;
            columns[0].SetStarWidth(1);
            columns[1].SetWidth(100);
            columns[2].SetStarWidth(3);
 
            ta.TableFrameStyle = new FrameStyle
            {
                LinePaddingAll = 20,
                LineColor = Color.SlateBlue,
                FillColor = Color.LightGreen,
                LineWidth = 10f
            };
 
            ta.ApplyCellConstraints();
 
            vTable.Draw = (g, v) =>
            {
                var rc = v.AsRectF();
                g.FillRectangle(rc, Color.White);
 
                var tl = g.CreateTextLayout();
                tl.AppendLine("Table rectangle (tableRect) is White,", FormatDesc);
                tl.AppendLine("Padding of the table frame is 20 (TableFrameStyle.LinePaddingAll),", FormatDesc);
                tl.AppendLine("Frame line width is 10 (TableFrameStyle.LineWidth),", FormatDesc);
                tl.AppendLine("Frame line color is SlateBlue (TableFrameStyle.LineColor),", FormatDesc);
                tl.AppendLine("Frame area color is LightGreen (TableFrameStyle.FillColor),", FormatDesc);
                tl.AppendLine("Padding of the table grid is 40 (the paddingAll parameter),", FormatDesc);
                tl.AppendLine("Table grid line width is 5 (the gridLineWidth parameter),", FormatDesc);
                tl.AppendLine("Grid line color is Yellow (the gridLineColor parameter).", FormatDesc);
                g.DrawTextLayout(tl, new PointF(0, rc.Bottom + 10));
 
                g.Transform = v.Layer.Surface.BaseTransform;
                ta.Render();
            };
 
            surf.Render(g);
        }
    }
}