3rdpartylibs/fastreports.wpf/FastReport.Mono/Utils/DrawUtils.Mono.cs

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using FastReport.Dialog;

namespace FastReport.Utils
{
    partial class DrawUtils
    {
        public static Bitmap DrawToBitmap(Control control, bool children)
        {
            if (control is Form form)
                return DrawForm(form);

            Bitmap bitmap = new Bitmap(control.Width, control.Height);
            using (Graphics gr = Graphics.FromImage(bitmap))
            {
                gr.Clear(control.BackColor);
            }
            control.DrawToBitmap(bitmap, new Rectangle(0, 0, control.Width, control.Height));
            return bitmap;
        }

        private static Bitmap DrawForm(Form form)
        {
            var width = form.FrameSize().Width;
            var height = form.FrameSize().Height;
            var offset = form.ClientAreaOffset();

            Bitmap bitmap = new Bitmap(width, height);
            using (Graphics gr = Graphics.FromImage(bitmap))
            {
                gr.Clear(SystemColors.Window);
                using (GraphicsPath gp = new GraphicsPath())
                {
                    var radius = 16;
                    gp.AddArc(0, 0, radius, radius, 180, 90);
                    gp.AddLine(radius, 0, width - radius, 0);
                    gp.AddArc(width - radius - 1, 0, radius, radius, 270, 90);
                    gp.AddLine(width - 1, radius, width - 1, height - 1);
                    gp.AddLine(width - 1, height - 1, 0, height - 1);
                    gp.CloseFigure();

                    var captionColor = SystemBrushes.InactiveCaption;
                    gr.FillPath(captionColor, gp);
                    gr.DrawPath(Pens.Gray, gp);

                    using (var br = new SolidBrush(form.BackColor))
                    {
                        gr.FillRectangle(br, offset.X, offset.Y, form.ClientRectangle.Width, form.ClientRectangle.Height);
                    }

#if AVALONIA
                    gr.FontScale = (float)form.DpiScale;
#endif
                    TextRenderer.DrawText(gr, form.Text, form.Font, new Rectangle(8, 0, width, offset.Y), SystemColors.WindowText, SystemColors.InactiveCaption, TextFormatFlags.VerticalCenter);
                }
            }

            return bitmap;
        }
    }
}