//// 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.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;
namespace DsImagingWeb.Demos{    // This sample demonstrates how to render a watermark on an image    // at an angle using a rotation transformation on the bitmap graphics.    public class Watermark2    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            // Note: we can use Color.Transparent instead of a solid background,            // but the resulting image format must support transparency for this            // to work as expected:            var backColor = Color.FromArgb(unchecked((int)0xff0066cc));            var foreColor = Color.FromArgb(unchecked((int)0xffffcc00));            float angle = -30;            var rad = (float)(angle * Math.PI) / 180f;
            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);            using (var bmpSrc = new GcBitmap(Path.Combine("Resources", "ImagesBis", "alpamayo-sq.jpg")))            {                // BitBlt requires the opacity of both images to be the same:                bmpSrc.Opaque = opaque;                // Render source image onto the target bitmap                // (generally we might want to resize the source image first,                // but in this case we just know that the source image has                // the same size as the target, so skip this step):                bmp.BitBlt(bmpSrc, 0, 0);            }
            using (var g = bmp.CreateGraphics())            {                // Draw watermark text in a loop over all image at an angle:                g.Transform = Matrix3x2.CreateRotation((float)(angle * Math.PI) / 180f, new Vector2(pixelSize.Width / 2, pixelSize.Height / 2));                var tf = new TextFormat()                {                    Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeSansBold.ttf")),                    FontSize = 14,                    ForeColor = Color.FromArgb(64, Color.White),
                };                var tl = g.CreateTextLayout();                tl.Append("Copyright (c) MESCIUS", tf);                tl.PerformLayout(true);                int dx = (int)tl.ContentWidth * 3;                int dy = (int)tl.ContentHeight * 5;                int n = 0;                int offX = -(int)(Math.Cos(rad) * pixelSize.Height / 2); ;                int offY = (int)(Math.Sin(rad) * pixelSize.Width / 2);                for (float y = offY; y < pixelSize.Height - offY; y += dy, ++n)                    for (float x = offX + dx / 2 * (n % 2); x < pixelSize.Width - offX; x += dx)                        g.DrawTextLayout(tl, new PointF(x, y));            }            return bmp;        }    }}