//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using System.Numerics;using GrapeCity.Documents.Drawing;using GrapeCity.Documents.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsImagingWeb.Demos{    // This sample demonstrates how to create a Glow effect using DsImaging.    // The Glow effect inflates all non-transparent areas of an image by a specified amount,    // then applies a Gaussian blur to make the border smooth. It is one of the effects    // that are found in MS Word for example.    //     // To achieve this effect in DsImaging, the GrayscaleBitmap.ApplyGlow() method is used    // on the transparency mask built from the color image on which we want the glow to appear,    // along with a few other simple steps as illustrated by this code.    //    // This example shows how to achieve the glow effect by blurring the content (text and image)    // and drawing the original content on it again. See GlowAlt for an alternative way    // that avoids drawing the content twice.    //    // The same GrayscaleBitmap.ApplyGlow() method is also used to achieve the Soft Edges effect    // as illustrated by the SoftEdges example.    public class Glow    {        private GCTEXT.Font _font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeSans.ttf"));
        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            // Draw text and logo on a transparent bitmap:            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, false);            bmp.Clear(Color.Transparent);            drawTextAndLogo();
            // Convert the image to a transparency mask:            using var gs = bmp.ToGrayscaleBitmap(ColorChannel.Alpha);
            // Apply the Glow effect to it; while for Soft Edges the inflation radius is negative,            // for Glow it should be positive, 6 here (9 is the blur radius):            gs.ApplyGlow(6, 9);
            // Map a shadow from the transparency mask to the source GcBitmap drawing opaque pixels            // with glow color (Yellow) and applying some additional transparency:            gs.ToShadowBitmap(bmp, Color.Yellow, 0.8f);
            // Fill the background:            bmp.ConvertToOpaque(Color.Gray);
            // Finally, draw the text and logo once more over the prepared background:            drawTextAndLogo();
            // Done            return bmp;
            void drawTextAndLogo()            {                var renderer = bmp.EnsureRendererCreated();                DrawText(renderer, pixelSize, dpi);                DrawLogo(renderer, new PointF(pixelSize.Width / 2, (int)(pixelSize.Height * 0.8)), pixelSize.Width / 2);            }        }
        void DrawText(BitmapRenderer renderer, Size pixelSize, float dpi)        {            var f1 = new TextFormat            {                Font = _font,                FontSize = pixelSize.Height / 7,                ForeColor = Color.DarkOrchid,                FontBold = true            };            var f2 = new TextFormat(f1)            {                ForeColor = Color.White,                StrokePen = new GCDRAW.Pen(Color.DarkOrchid, 3)            };            var tl = new TextLayout(dpi)            {                MaxWidth = pixelSize.Width,                MaxHeight = pixelSize.Height,                ParagraphAlignment = ParagraphAlignment.Near,                TextAlignment = TextAlignment.Center,                MarginTop = dpi * 2,                LineSpacingScaleFactor = 0.7f,            };            tl.AppendLine("Document", f1);            tl.AppendLine("Solutions", f2);
            // Draw the text:            renderer.SlowAntialiasing = true;            renderer.DrawTextLayout(tl, 0, 0);        }
        void DrawLogo(BitmapRenderer renderer, PointF center, float width)        {            var pb = new PathBuilder();            pb.BeginFigure(100, 350);            pb.AddLine(210, 310);            var arc = new ArcSegment            {                Size = new SizeF(183, 173),                SweepDirection = SweepDirection.Clockwise,                Point = new PointF(550, 205),            };            pb.AddArc(arc);            pb.AddLine(650, 170);            pb.AddLine(680, 250);            pb.AddLine(575, 285);            arc.Point = new PointF(240, 390);            pb.AddArc(arc);            pb.AddLine(130, 430);            pb.EndFigure(true);            pb.Figures.Add(new EllipticFigure(new RectangleF(295, 197, 200, 190)));            var gpFill = pb.ToPath();            var gpStroke = gpFill.Widen(new GCDRAW.Pen(Color.Black, 20));
            // Our 'base' size is 800 x 600 pixels:            float scale = width / 800;            renderer.Transform = Matrix3x2.CreateScale(scale) *                Matrix3x2.CreateTranslation(center.X - 400 * scale, center.Y - 300 * scale);            renderer.FillPath(gpFill, Color.CornflowerBlue);            renderer.FillPath(gpStroke, Color.DarkOrchid);            renderer.Transform = Matrix3x2.Identity;        }    }}