Win2D/README.md

# Win2D

Win2D is an easy-to-use Windows Runtime API for immediate mode 2D graphics 
rendering with GPU acceleration. It is available to C# and C++ developers writing 
Windows Store apps for Windows 8.1 and Windows Phone 8.1. It utilizes the power of 
Direct2D, and integrates seamlessly with XAML and CoreWindow.

Win2D is work in progress and evolving rapidly. The goal of releasing this code 
in an early, incomplete state is to solicit early developer feedback.

- [NuGet packages](http://www.nuget.org/packages/Win2D)
- [Documentation](http://microsoft.github.io/Win2D)
- [Features](http://github.com/Microsoft/Win2D/wiki/Features) - *what's implemented so far*
- [Backlog](http://github.com/Microsoft/Win2D/wiki/Backlog) - *what we plan to add next*
- [Team blog](http://blogs.msdn.com/b/win2d)
- [License](http://www.apache.org/licenses/LICENSE-2.0.html)
- [Contributing](http://github.com/Microsoft/Win2D/blob/master/CONTRIBUTING.md)
- Example Gallery for [Windows](http://apps.microsoft.com/windows/en-us/app/win2d-example-gallery/b668cfe1-e280-4c1e-adc1-09b7981ab084) and [Phone](http://www.windowsphone.com/en-us/store/app/win2d-example-gallery/8797b9cb-1443-475f-9a43-dd959de6fcc1) - *source code [here](https://github.com/Microsoft/Win2D/tree/master/tests/ExampleGallery/Shared)*

## Code Example
To give you a flavor of what the code looks like, here is a snippet of XAML:
```xml
xmlns:canvas="using:Microsoft.Graphics.Canvas.UI.Xaml"

<Grid>
    <canvas:CanvasControl Draw="canvasControl_Draw" ClearColor="CornflowerBlue" />
</Grid>
```
and C#:
```cs
void canvasControl_Draw(CanvasControl sender, CanvasDrawEventArgs args)
{
    args.DrawingSession.DrawEllipse(155, 115, 80, 30, Colors.Black, 3);
    args.DrawingSession.DrawText("Hello, world!", 100, 100, Colors.Yellow);
}
```

## Using Win2D

The [documentation](http://microsoft.github.io/Win2D) explains how to install Visual 
Studio, add the Win2D NuGet package to your project, and get started using the API.

## Building Win2D from source

##### Clone Repository
- Go to 'View' -> 'Team Explorer' -> 'Local Git Repositories' -> 'Clone'
- Add the Win2D repository URL (https://github.com/Microsoft/Win2D.git) and hit 'Clone'

##### Build NuGet Packages
- If using Visual Studio 2013:
  - In Windows search, type 'Visual Studio Tools', and select that folder to open it
  - Launch 'Developer Command Prompt for VS2013' 
- If using Visual Studio 2015:
  - Launch 'MSBuild Command Prompt for VS2015'
- Change directory to your cloned Win2D repository and run 'build'

##### Point Visual Studio at the resulting 'bin' directory
- In Visual Studio, go to 'Tools' -> 'NuGet Package Manager' -> 'Package Manager Settings'
- Choose 'Package Sources'
- Click the '+' button to add a new source
- Set 'Name' to 'Win2D' (or a name of your choosing)
- Set 'Source' to the full path to the 'bin' directory (inside your cloned Win2D repository)
- Click the 'Update' button
- Click 'OK'

Locally built versions of Win2D are marked as prerelease, so you must change the 'Stable 
Only' setting to 'Include Prerelease' when adding them to your project.


## Preview of Windows universal app platform support

A preview of Win2D's support for the universal app platform is available through
source builds only.

### Building the Win2D-UAP NuGet package

Follow these steps to build a NuGet package that can be consumed by a Windows
universal app:

- Install the [Windows 10 developer tooling
  preview](http://blogs.windows.com/buildingapps/2015/03/23/windows-10-developer-tooling-preview-now-available-to-windows-insiders/)
- Launch "MSBuild Command Prompt for VS2015" (not "Developer Command Prompt")
- Change directory to your cloned Win2D repository and execute the following commands:

```console
> build
> msbuild win2d.proj /p:BuildTests=false /p:BuildTools=false /p:BuildDocs=false /p:BuildWindows=false /p:BuildPhone=false
> cd build\nuget
> set OVERRIDE_NUGET_PACKAGE=Win2D-UAP
> build-nupkg local
```

- This will generate a NuGet package called Win2D-UAP.


### Using the Win2D-UAP NuGet package

- Install the Win2D-UAP package as usual.

As various parts of the platform, SDK and development tools are still under
development, there are some rough edges:

- Currently, C# apps will also need to install the System.Numerics.Vectors package.

- Currently, C# apps will need to enable the "Compile with .NET Native tool
  chain" option available through the "Build" tab of the app properties.

- The template for C# UAP apps includes the following line in App.xaml.cs, which
  needs to be removed or commented out as it is incompatible with the .NET
  native tool chain:

```C#
public TelemetryClient TelemetryClient = new TelemetryClient();
```