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# Pixel [](https://travis-ci.org/faiface/pixel) [](https://godoc.org/github.com/faiface/pixel) [](https://goreportcard.com/report/github.com/faiface/pixel) [](https://gitter.im/pixellib/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [](https://discord.gg/q2DK4MP)
A hand-crafted 2D game library in Go. Take a look into the [features](#features) to see what it can
do.
If you are using Modules (Go 1.11 or higher) and want a mutable copy of the source code:
```
git clone https://nproject.io/gitlab/nproject/pixel # clone outside of $GOPATH
See [requirements](#requirements) for the list of libraries necessary for compilation.
All significant changes are documented in [CHANGELOG.md](CHANGELOG.md).
## Tutorial
The [Wiki of this repo](https://github.com/faiface/pixel/wiki) contains an extensive tutorial
covering several topics of Pixel. Here's the content of the tutorial parts so far:
- [Creating a Window](https://github.com/faiface/pixel/wiki/Creating-a-Window)
- [Drawing a Sprite](https://github.com/faiface/pixel/wiki/Drawing-a-Sprite)
- [Moving, scaling and rotating with Matrix](https://github.com/faiface/pixel/wiki/Moving,-scaling-and-rotating-with-Matrix)
- [Pressing keys and clicking mouse](https://github.com/faiface/pixel/wiki/Pressing-keys-and-clicking-mouse)
- [Drawing efficiently with Batch](https://github.com/faiface/pixel/wiki/Drawing-efficiently-with-Batch)
- [Drawing shapes with IMDraw](https://github.com/faiface/pixel/wiki/Drawing-shapes-with-IMDraw)
- [Typing text on the screen](https://github.com/faiface/pixel/wiki/Typing-text-on-the-screen)
- [Using a custom fragment shader](https://github.com/faiface/pixel/wiki/Using-a-custom-fragment-shader)
## [Examples](https://github.com/faiface/pixel-examples)
The [examples](https://github.com/faiface/pixel-examples) repository contains a few
examples demonstrating Pixel's functionality.
**To run an example**, navigate to it's directory, then `go run` the `main.go` file. For example:
```
$ cd pixel-examples/platformer
| [Lights](https://github.com/faiface/pixel-examples/blob/master/lights) | [Platformer](https://github.com/faiface/pixel-examples/blob/master/platformer) |
|  |  |
| [Smoke](https://github.com/faiface/pixel-examples/blob/master/smoke) | [Typewriter](https://github.com/faiface/pixel-examples/blob/master/typewriter) |
|  |  |
| [Raycaster](https://github.com/faiface/pixel-examples/blob/master/community/raycaster) | [Gizmo](https://github.com/Lallassu/gizmo) |
|  |  |
Here's the list of the main features in Pixel. Although Pixel is still under heavy development,
**there should be no major breakage in the API.** This is not a 100% guarantee, though.
- Fast 2D graphics
- Sprites
- Primitive shapes with immediate mode style
[IMDraw](https://github.com/faiface/pixel/wiki/Drawing-shapes-with-IMDraw) (circles, rectangles,
lines, ...)
- Optimized drawing with [Batch](https://github.com/faiface/pixel/wiki/Drawing-efficiently-with-Batch)
- Text drawing with [text](https://godoc.org/github.com/faiface/pixel/text) package
- Audio through a separate [Beep](https://github.com/faiface/beep) library.
- Drawing a sprite to a window is as simple as `sprite.Draw(window, matrix)`
- Wanna know where the center of a window is? `window.Bounds().Center()`
- [...](https://godoc.org/github.com/faiface/pixel)
- Works on Linux, macOS and Windows
- Window creation and manipulation (resizing, fullscreen, multiple windows, ...)
- Keyboard (key presses, text input) and mouse input without events
- Well integrated with the Go standard library
- Use `"image"` package for loading pictures
- Use `"time"` package for measuring delta time and FPS
- Use `"image/color"` for colors, or use Pixel's own `color.Color` format, which supports easy
- Pixel uses `float64` throughout the library, compatible with `"math"` package
- Geometry transformations with
[Matrix](https://github.com/faiface/pixel/wiki/Moving,-scaling-and-rotating-with-Matrix)
- Moving, scaling, rotating
- Easy camera implementation
- Off-screen drawing to Canvas or any other target (Batch, IMDraw, ...)
- Fully garbage collected, no `Close` or `Dispose` methods
- Full [Porter-Duff](http://ssp.impulsetrain.com/porterduff.html) composition, which enables
- 2D lighting
- Cutting holes into objects
- Much more...
- Pixel let's you draw stuff and do your job, it doesn't impose any particular style or paradigm
- Platform and backend independent [core](https://godoc.org/github.com/faiface/pixel)
- Core Target/Triangles/Picture pattern makes it easy to create new drawing targets that do
arbitrarily crazy stuff (e.g. graphical effects)
- Small codebase, ~5K lines of code, including the backend [glhf](https://github.com/faiface/glhf)
package
## Related repositories
Here are some packages which use Pixel:
- [TilePix](https://github.com/bcvery1/tilepix) Makes handling TMX files built with [Tiled](https://www.mapeditor.org/)
trivially easy to work with using Pixel.
Pixel is in development and still missing few critical features. Here're the most critical ones.
- Antialiasing (filtering is supported, though)
- ~~Advanced window manipulation (cursor hiding, window icon, ...)~~
- Better support for Hi-DPI displays
- Mobile (and perhaps HTML5?) backend
- ~~More advanced graphical effects (e.g. blur)~~ (solved with the addition of GLSL effects)
- Vulkan support
**Implementing these features will get us to the 1.0 release.** Contribute, so that it's as soon as
possible!
## Requirements
If you're using Windows and having trouble building Pixel, please check [this
guide](https://github.com/faiface/pixel/wiki/Building-Pixel-on-Windows) on the
[wiki](https://github.com/faiface/pixel/wiki).
[PixelGL](https://godoc.org/github.com/faiface/pixel/pixelgl) backend uses OpenGL to render
graphics. Because of that, OpenGL development libraries are needed for compilation. The dependencies
are same as for [GLFW](https://github.com/go-gl/glfw).
- On macOS, you need Xcode or Command Line Tools for Xcode (`xcode-select --install`) for required
headers and libraries.
- On Ubuntu/Debian-like Linux distributions, you need `libgl1-mesa-dev` and `xorg-dev` packages.
- On CentOS/Fedora-like Linux distributions, you need `libX11-devel libXcursor-devel libXrandr-devel
libXinerama-devel mesa-libGL-devel libXi-devel` packages.
- See [here](http://www.glfw.org/docs/latest/compile.html#compile_deps) for full details.
**The combination of Go 1.8, macOS and latest XCode seems to be problematic** as mentioned in issue
[#7](https://github.com/faiface/pixel/issues/7). This issue is probably not related to Pixel.
**Upgrading to Go 1.8.1 fixes the issue.**
Join us in the [Discord Chat!](https://discord.gg/q2DK4MP)
Pixel is in, let's say, mid-stage of development. Many of the important features are here, some are
missing. That's why **contributions are very important and welcome!** All alone, I will be able to
finish the library, but it'll take a lot of time. With your help, it'll take much less. I encourage
everyone to contribute, even with just an idea. Especially welcome are **issues** and **pull
requests**.
**However, I won't accept everything. Pixel is being developed with thought and care.** Each
component was designed and re-designed multiple times. Code and API quality is very important here.
API is focused on simplicity and expressiveness.
When contributing, keep these goals in mind. It doesn't mean that I'll only accept perfect pull
requests. It just means that I might not like your idea. Or that your pull requests could need some
rewriting. That's perfectly fine, don't let it put you off. In the end, we'll just end up with a
better result.
Take a look at [CONTRIBUTING.md](CONTRIBUTING.md) for further information.