Add Magick.NET demo

Demo-ImageMagick/Demo-ImageMagick.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>Net.Codecrete.QrCodeGenerator.Demo</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Magick.NET-Q16-AnyCPU" Version="11.3.0" />
+    <PackageReference Include="Net.Codecrete.QrCodeGenerator" Version="2.0.3" />
+  </ItemGroup>
+
+</Project>

Demo-ImageMagick/Demo-ImageMagick.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.2.32630.192
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Demo-ImageMagick", "Demo-ImageMagick.csproj", "{E4F86D1E-F08C-4BFE-BC37-9BED8A411E88}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E4F86D1E-F08C-4BFE-BC37-9BED8A411E88}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E4F86D1E-F08C-4BFE-BC37-9BED8A411E88}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E4F86D1E-F08C-4BFE-BC37-9BED8A411E88}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E4F86D1E-F08C-4BFE-BC37-9BED8A411E88}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {BC2EF2FB-30F7-431B-B92C-05E9C7B7B07B}
+	EndGlobalSection
+EndGlobal

Demo-ImageMagick/Program.cs

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+//
+// QR code generator library (.NET)
+// https://github.com/manuelbl/QrCodeGenerator
+//
+// Copyright (c) 2022 suxiaobu9, Manuel Bleichenbacher
+// Licensed under MIT License
+// https://opensource.org/licenses/MIT
+//
+
+using ImageMagick;
+using Net.Codecrete.QrCodeGenerator;
+
+string text = "Hello, world!",
+    fileName = "hello-world-QR.png";
+
+var qr = QrCode.EncodeText(text, QrCode.Ecc.Medium);
+
+qr.SaveAsPng(fileName, 10, 4, MagickColors.Black, MagickColors.White);

Demo-ImageMagick/QrCodeImageExtensions.cs

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+//
+// QR code generator library (.NET)
+// https://github.com/manuelbl/QrCodeGenerator
+//
+// Copyright (c) 2022 suxiaobu9, Manuel Bleichenbacher
+// Licensed under MIT License
+// https://opensource.org/licenses/MIT
+//
+
+using ImageMagick;
+
+namespace Net.Codecrete.QrCodeGenerator;
+
+public static class QrCodeImageExtensions
+{
+    /// <summary>
+    /// Creates a image of this QR code.
+    /// <para>
+    /// The <paramref name="scale"/> parameter specifies the scale of the image, which is
+    /// equivalent to the width and height of each QR code module. Additionally, the number
+    /// of modules to add as a border to all four sides can be specified.
+    /// </para>
+    /// <para>
+    /// For example, <c>ToBitmap(scale: 10, border: 4)</c> means to pad the QR code with 4 white
+    /// border modules on all four sides, and use 10&#xD7;10 pixels to represent each module.
+    /// </para>
+    /// </summary>
+    /// <param name="scale">The width and height, in pixels, of each module.</param>
+    /// <param name="border">The number of border modules to add to each of the four sides.</param>
+    /// <param name="background">The background color.</param>
+    /// <param name="foreground">The foreground color.</param>
+    /// <returns></returns>
+    /// <exception cref="ArgumentOutOfRangeException"></exception>
+    public static MagickImage ToImage(this QrCode qrCode, int scale, int border, MagickColor foreground, MagickColor background)
+    {
+        if (scale <= 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(scale), " Value out of range");
+        }
+
+        if (border < 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(border), " Value out of range");
+        }
+
+        var size = qrCode.Size;
+        var dim = (size + border * 2) * scale;
+
+        if (dim > short.MaxValue)
+        {
+            throw new ArgumentOutOfRangeException(nameof(scale), " Scale or border too large");
+        }
+
+        var image = new MagickImage(background, dim, dim)
+        {
+            Format = MagickFormat.Png,
+        };
+
+        var drawables = new Drawables();
+        drawables.FillColor(foreground);
+
+        for (var x = 0; x < size; x++)
+        {
+            var pointerX = (x + border) * scale;
+
+            for (var y = 0; y < size; y++)
+            {
+                if (qrCode.GetModule(x, y))
+                {
+                    var pointerY = (y + border) * scale;
+                    drawables.Rectangle(pointerX, pointerY, pointerX + scale - 1, pointerY + scale - 1);
+                }
+            }
+        }
+        drawables.Draw(image);
+        return image;
+    }
+
+    /// <summary>
+    /// Creates a PNG image of this QR code and returns it as a byte array.
+    /// <para>
+    /// The <paramref name="scale"/> parameter specifies the scale of the image, which is
+    /// equivalent to the width and height of each QR code module. Additionally, the number
+    /// of modules to add as a border to all four sides can be specified.
+    /// </para>
+    /// <para>
+    /// For example, <c>ToPng(scale: 10, border: 4)</c> means to pad the QR code with 4 white
+    /// border modules on all four sides, and use 10&#xD7;10 pixels to represent each module.
+    /// </para>
+    /// </summary>
+    /// <param name="scale">The width and height, in pixels, of each module.</param>
+    /// <param name="border">The number of border modules to add to each of the four sides.</param>
+    /// <param name="foreground">The foreground color.</param>
+    /// <param name="background">The background color.</param>
+    /// <returns></returns>
+    public static byte[] ToPng(this QrCode qrCode, int scale, int border, MagickColor foreground, MagickColor background)
+    {
+        using var image = qrCode.ToImage(scale, border, foreground, background);
+        return image.ToByteArray();
+    }
+
+    /// <summary>
+    /// Saves this QR code as a PNG file.
+    /// <para>
+    /// The <paramref name="scale"/> parameter specifies the scale of the image, which is
+    /// equivalent to the width and height of each QR code module. Additionally, the number
+    /// of modules to add as a border to all four sides can be specified.
+    /// </para>
+    /// <para>
+    /// For example, <c>SaveAsPng("qrcode.png", scale: 10, border: 4)</c> means to pad the QR code with 4 white
+    /// border modules on all four sides, and use 10&#xD7;10 pixels to represent each module.
+    /// </para>
+    /// </summary>
+    /// <param name="scale">The width and height, in pixels, of each module.</param>
+    /// <param name="border">The number of border modules to add to each of the four sides.</param>
+    /// <param name="foreground">The foreground color.</param>
+    /// <param name="background">The background color.</param>
+    public static void SaveAsPng(this QrCode qrCode, string fileName, int scale, int border, MagickColor foreground, MagickColor background)
+    {
+        using var image = qrCode.ToImage(scale, border, foreground, background);
+        image.Write(fileName);
+    }
+}

Demo-ImageMagick/README.me

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+# Saving as PNG using Magick.NET
+
+This example program shows how to create a QR code and save it as a PNG file using the [Magick.NET](https://github.com/dlemstra/Magick.NET) image manipulation library (based on ImageMagick).

README.md

@@ -166,3 +166,5 @@ Several example projects are provided:
 - [Demo-SkiaSharp](Demo-SkiaSharp): Demonstrates how a QR code can be saved a PNG file, using the SkiaSharp multi-platform raster image library.
 
 - [Demo-ImageSharp](Demo-ImageSharp): Demonstrates how a QR code can be saved a PNG file, using the ImageSharp raster image library. Additionally, a QR code with an image in the center is created.
+
+- [Demo-SkiaSharp](Demo-ImageMagick): Demonstrates how a QR code can be saved a PNG file, using the Magick.NET image manipulation library (based on ImageMagick).