//// 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 example shows how to draw a window with a solid frame    // and four semi-transparent colored window panes,    // floating above a solid brick wall with some text written on it,    // and casting a semi-transparent colored shadow on the wall.    public class TransparentShadow    {        private GCTEXT.Font _font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "KaushanScript-Regular.ttf"));
        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            // A temporary bitmap to hold the shadow:            using var shadow = new GcBitmap(pixelSize.Width, pixelSize.Height, false);
            // Draw the window on the shadow bitmap; the offsetX/offsetY (64/82)            // account for the shadow's offset relative to the floating window            // that will be drawn later:            using (var g = shadow.CreateGraphics(Color.Transparent))                DrawWindow(g, pixelSize, 64, 82);
            // Create a shadow without blur in 'shadowTemp' and blend it with the main shadow bitmap            // in order to render colored shadows of the semi-transparent window panes:            using (var gs = shadow.ToGrayscaleBitmap(ColorChannel.Alpha))            using (var shadowTemp = gs.ToShadowBitmap(Color.DarkSlateGray))                shadow.AlphaBlend(shadowTemp, 0, 0);
            // At this point 'shadow' contains opaque colored shadow without blur,            // we apply the blur effect and make it semi-transparent:            shadow.ApplyEffect(GaussianBlurEffect.Get(29));            shadow.ApplyEffect(OpacityEffect.Get(0.85f));
            // Prepare the brick wall image:            var wall = new GcBitmap(pixelSize.Width, pixelSize.Height, true);            using (var g = wall.CreateGraphics(Color.DarkSalmon))                DrawWall(g, pixelSize);
            // Blend the shadow with the wall:            wall.AlphaBlend(shadow, 0, 0);
            // Finally draw the window floating in front of the wall:            using (var g = wall.CreateGraphics())                DrawWindow(g, pixelSize, 0, 0);
            // Done            return wall;        }
        // Draw a window with four colored semi-transparent panes:        void DrawWindow(GcGraphics g, Size pixelSize, float offsetX, float offsetY)        {            var w = pixelSize.Width * 0.4f;            var h = pixelSize.Height * 0.5f;            var x = pixelSize.Width / 2 - w / 2;            var y = pixelSize.Height / 2 - h / 2;
            g.Transform = Matrix3x2.CreateTranslation(offsetX, offsetY);
            var wnd = new RectangleF(x, y, w, h);            var winHalf = new SizeF(wnd.Width / 2, wnd.Height / 2);            var glassTL = Color.FromArgb(unchecked((int)0x70FF4600));            var glassTR = Color.FromArgb(unchecked((int)0x70A5FF00));            var glassBL = Color.FromArgb(unchecked((int)0x70007BFF));            var glassBR = Color.FromArgb(unchecked((int)0x70FFCD00));
            g.FillRectangle(new RectangleF(wnd.Location, winHalf), glassTL);            g.FillRectangle(new RectangleF(new PointF(wnd.X + wnd.Width / 2, wnd.Y), winHalf), glassTR);            g.FillRectangle(new RectangleF(new PointF(wnd.X, wnd.Y + wnd.Height / 2), winHalf), glassBL);            g.FillRectangle(new RectangleF(new PointF(wnd.X + wnd.Width / 2, wnd.Y + wnd.Height / 2), winHalf), glassBR);
            var outline = Color.DarkSlateGray;            g.DrawRectangle(wnd, new GCDRAW.Pen(outline, 34));            g.DrawLine(wnd.Left, wnd.Top + wnd.Height / 2, wnd.Right, wnd.Top + wnd.Height / 2, outline, 24);            g.DrawLine(wnd.Left + wnd.Width / 2, wnd.Top, wnd.Left + wnd.Width / 2, wnd.Bottom, outline, 24);            var frame = Color.LightGoldenrodYellow;            g.DrawRectangle(wnd, new GCDRAW.Pen(frame, 30));            g.DrawLine(wnd.Left, wnd.Top + wnd.Height / 2, wnd.Right, wnd.Top + wnd.Height / 2, frame, 20);            g.DrawLine(wnd.Left + wnd.Width / 2, wnd.Top, wnd.Left + wnd.Width / 2, wnd.Bottom, frame, 20);
            g.Transform = Matrix3x2.Identity;        }
        // Draw a brick wall with a white text:        void DrawWall(GcGraphics g, Size pixelSize)        {            // The brick pattern:            var brick = new Size(112, 44);            var pen = new GCDRAW.Pen(Color.DimGray, 2);            var off = brick.Width / 2;            for (int y = -brick.Height / 3; y < pixelSize.Height; y += brick.Height)            {                for (int x = off + brick.Width / 3; x < pixelSize.Width; x += brick.Width)                {                    g.DrawLine(x, y, x, y + brick.Height, pen);                }                off = off == 0 ? brick.Width / 2 : 0;                g.DrawLine(0, y, pixelSize.Width, y, pen);            }            // Graffiti-like white text (overlay blend mode is used to visually preserve the joints):            var tl = g.CreateTextLayout();            tl.MaxWidth = pixelSize.Width;            tl.MaxHeight = pixelSize.Height;            tl.ParagraphAlignment = ParagraphAlignment.Center;            tl.TextAlignment = TextAlignment.Center;            tl.DefaultFormat.Font = _font;            tl.DefaultFormat.FontSize = 270;            tl.DefaultFormat.ForeColor = Color.White;            tl.ParagraphSpacing = -120;            tl.Append("The\nWall");            g.BlendMode = BlendMode.Overlay;            g.DrawTextLayout(tl, Point.Empty);            g.BlendMode = BlendMode.Normal;        }    }}