add watermark demo

Demos.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26403.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WaterMarkSample", "WaterMarkSample\WaterMarkSample.csproj", "{06858879-8323-4F32-8260-EFA17EC1DD4F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{06858879-8323-4F32-8260-EFA17EC1DD4F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{06858879-8323-4F32-8260-EFA17EC1DD4F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{06858879-8323-4F32-8260-EFA17EC1DD4F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{06858879-8323-4F32-8260-EFA17EC1DD4F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

NuGet.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="myget.org imagesharp" value="https://www.myget.org/F/imagesharp/api/v3/index.json" />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="nuget.org" value="https://www.nuget.org/api/v2/" />
+  </packageSources>
+</configuration>

README.md

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+# Demos
+
+The demos here will mostly be detailed in blog posts at http://sixlabors.com/blog/

WaterMarkSample/Program.cs

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+using System;
+using System.Numerics;
+using ImageSharp;
+using SixLabors.Fonts;
+
+namespace WaterMarkSample
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            FontFamily family = FontCollection.SystemFonts.Find("Arial");
+
+            Font font = new Font(family, 100f, FontStyle.Bold);
+
+            ApplyWaterMarkSimple(font, "Copyright Person Name", "small.jpg", "small_simple.jpg");
+            ApplyWaterMarkSimple(font, "Copyright Person Name", "large.jpg", "large_simple.jpg");
+
+            ApplyWaterMarkScaled(font, "Copyright Person Name", "small.jpg", "small_scaled.jpg");
+            ApplyWaterMarkScaled(font, "Copyright Person Name", "large.jpg", "large_scaled.jpg");
+        }
+
+        static void ApplyWaterMarkSimple(Font font, string text, string inputPath, string outputPath)
+        {
+            using (Image img = Image.Load(inputPath))
+            {
+                Color fill = new Color(128, 128, 128, 200);
+
+                img.DrawText(text, font, fill, new Vector2(0, 0));
+
+                img.Save(outputPath);
+                
+            }
+        }
+
+        static void ApplyWaterMarkScaled(Font font, string text, string inputPath, string outputPath)
+        {
+            using (Image img = Image.Load(inputPath))
+            {
+                TextMeasurer measurer = new TextMeasurer();
+
+                // we can now get the dimensions of the bounding box of a piece of text
+                SixLabors.Fonts.Size size = measurer.MeasureText(text, font, 72);
+
+                //  calculate the scaling factor we need to change the fontsize by to fit the image
+                float scalingFactor = Math.Min(img.Width / size.Width, img.Height / size.Height);
+
+                Font scaledFont = new Font(font, scalingFactor * font.Size);
+                Color fill = new Color(128, 128, 128, 200);
+
+                img.DrawText(text, scaledFont
+                    , fill, new Vector2(0, 0));
+
+                img.Save(outputPath);
+            }
+        }
+    }
+}

WaterMarkSample/WaterMarkSample.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp1.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="ImageSharp" Version="1.0.0-alpha5-00054" />
+    <PackageReference Include="ImageSharp.Drawing" Version="1.0.0-alpha5-00048" />
+  </ItemGroup>
+
+</Project>