//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using GrapeCity.Documents.Drawing;using GrapeCity.Documents.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;
namespace DsImagingWeb.Demos{    // This sample shows the results of enlarging a small (57 by 57 pixels) image    // of a QRCode using the 4 available interpolation modes.    // While for most images (such as portraits or landscapes), Linear or Cubic    // interpolation modes would normally yield better-looking results,    // for images like QRCodes or barcodes using the NearestNeighbor or    // Downscale modes is more appropriate.    //    // See EnlargeImage for an example where a small photo (portrait of a woman)    // is enlarged using the same 4 interpolation modes.    public class EnlargeQRCode    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            // Create and clear the target bitmap:            var targetBmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);            targetBmp.Clear(Color.Transparent);
            const int fontSize = 16;            var xpad = (int)(dpi * .5f);            var ypad = (int)(dpi * .7f);            TextFormat tf = new TextFormat            {                Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeSerif.ttf")),                FontSize = fontSize,            };
            // Small image of a QRCode:            using var origBmp = new GcBitmap();            using (var stm = File.OpenRead(Path.Combine("Resources", "ImagesBis", "QRCode-57x57.png")))                origBmp.Load(stm);
            // Make sure opaqueness of the original bitmap matches the target:            origBmp.Opaque = targetBmp.Opaque;
            var ip = new Point(xpad, ypad);
            // Draw the original with the original size:            targetBmp.BitBlt(origBmp, ip.X, ip.Y);            using (var g = targetBmp.CreateGraphics(null))                g.DrawString($"⟵ Original image ({origBmp.PixelWidth} by {origBmp.PixelHeight} pixels)", tf, new PointF(xpad * 2 + origBmp.Width, ip.Y));            ip.Y += origBmp.PixelHeight + ypad;
            // We are going to enlarge the original small image by a factor of 6:            var f = 6;            int twidth = origBmp.PixelWidth * f;            int theight = origBmp.PixelHeight * f;
            // Enlarge and draw 4 copies of the image using the 4 available interpolation modes:            using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.NearestNeighbor))                targetBmp.BitBlt(bmp, ip.X, ip.Y);            drawCaption("InterpolationMode.NearestNeighbor", ip.X, ip.Y + theight);
            using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.Cubic))                targetBmp.BitBlt(bmp, ip.X + twidth + xpad, ip.Y);            drawCaption("InterpolationMode.Cubic", ip.X + twidth + xpad, ip.Y + theight);
            ip.Y += theight + ypad;
            using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.Linear))                targetBmp.BitBlt(bmp, ip.X, ip.Y);            drawCaption("InterpolationMode.Linear", ip.X, ip.Y + theight);
            using (var bmp = origBmp.Resize(twidth, theight, InterpolationMode.Downscale))                targetBmp.BitBlt(bmp, ip.X + twidth + xpad, ip.Y);            drawCaption("InterpolationMode.Downscale", ip.X + twidth + xpad, ip.Y + theight);            //            void drawCaption(string caption, float x, float y)            {                using var g = targetBmp.CreateGraphics(null);                g.DrawString(caption, tf, new PointF(x, y));            }            return targetBmp;        }    }}