161 lines
7.8 KiB
Markdown
161 lines
7.8 KiB
Markdown
# 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)
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A hand-crafted 2D game library in Go. Take a look into the [features](#features) to see what it can
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do.
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```
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go get github.com/faiface/pixel
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```
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See [requirements](#requirements) for the list of libraries necessary for compilation.
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## Tutorial
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The [Wiki of this repo](https://github.com/faiface/pixel/wiki) contains an extensive tutorial
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covering several topics of Pixel. Here's the content of the tutorial parts so far:
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- [Creating a Window](https://github.com/faiface/pixel/wiki/Creating-a-Window)
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- [Drawing a Sprite](https://github.com/faiface/pixel/wiki/Drawing-a-Sprite)
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- [Moving, scaling and rotating with Matrix](https://github.com/faiface/pixel/wiki/Moving,-scaling-and-rotating-with-Matrix)
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- [Pressing keys and clicking mouse](https://github.com/faiface/pixel/wiki/Pressing-keys-and-clicking-mouse)
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- [Drawing efficiently with Batch](https://github.com/faiface/pixel/wiki/Drawing-efficiently-with-Batch)
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- [Drawing shapes with IMDraw](https://github.com/faiface/pixel/wiki/Drawing-shapes-with-IMDraw)
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- [Typing text on the screen](https://github.com/faiface/pixel/wiki/Typing-text-on-the-screen)
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## Examples
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The [examples](https://github.com/faiface/pixel/tree/master/examples) directory contains a few
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examples demonstrating Pixel's functionality.
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**To run an example**, navigate to it's directory, then `go run` the `main.go` file. For example:
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```
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$ cd examples/platformer
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$ go run main.go
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```
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Here are some screenshots from the examples!
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| [Lights](examples/lights) | [Platformer](examples/platformer) |
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| --- | --- |
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| [Smoke](examples/smoke) | [Typewriter](examples/typewriter) |
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| --- | --- |
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| [Raycaster](examples/community/raycaster) | [Starfield](examples/community/starfield) |
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| --- | --- |
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|  |  |
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## Features
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Here's the list of the main features in Pixel. Although Pixel is still under heavy development,
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**there should be no major breakage in the API.** This is not a 100% guarantee, though.
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- Fast 2D graphics
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- Sprites
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- Primitive shapes with immediate mode style
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[IMDraw](https://github.com/faiface/pixel/wiki/Drawing-shapes-with-IMDraw) (circles, rectangles,
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lines, ...)
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- Optimized drawing with [Batch](https://github.com/faiface/pixel/wiki/Drawing-efficiently-with-Batch)
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- Text drawing with [text](https://godoc.org/github.com/faiface/pixel/text) package
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- Audio through a separate [Beep](https://github.com/faiface/beep) library.
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- Simple and convenient API
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- Drawing a sprite to a window is as simple as `sprite.Draw(window, matrix)`
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- Wanna know where the center of a window is? `window.Bounds().Center()`
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- [...](https://godoc.org/github.com/faiface/pixel)
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- Full documentation and tutorial
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- Works on Linux, macOS and Windows
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- Window creation and manipulation (resizing, fullscreen, multiple windows, ...)
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- Keyboard (key presses, text input) and mouse input without events
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- Well integrated with the Go standard library
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- Use `"image"` package for loading pictures
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- Use `"time"` package for measuring delta time and FPS
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- Use `"image/color"` for colors, or use Pixel's own `color.Color` format, which supports easy
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multiplication and a few more features
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- Pixel uses `float64` throughout the library, compatible with `"math"` package
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- Geometry transformations with
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[Matrix](https://github.com/faiface/pixel/wiki/Moving,-scaling-and-rotating-with-Matrix)
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- Moving, scaling, rotating
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- Easy camera implementation
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- Off-screen drawing to Canvas or any other target (Batch, IMDraw, ...)
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- Fully garbage collected, no `Close` or `Dispose` methods
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- Full [Porter-Duff](http://ssp.impulsetrain.com/porterduff.html) composition, which enables
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- 2D lighting
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- Cutting holes into objects
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- Much more...
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- Pixel let's you draw stuff and do your job, it doesn't impose any particular style or paradigm
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- Platform and backend independent [core](https://godoc.org/github.com/faiface/pixel)
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- Core Target/Triangles/Picture pattern makes it easy to create new drawing targets that do
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arbitrarily crazy stuff (e.g. graphical effects)
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- Small codebase, ~5K lines of code, including the backend [glhf](https://github.com/faiface/glhf)
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package
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## Missing features
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Pixel is in development and still missing few critical features. Here're the most critical ones.
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- ~~Audio~~
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- ~~Drawing text~~
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- Antialiasing (filtering is supported, though)
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- ~~Advanced window manipulation (cursor hiding, window icon, ...)~~
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- Better support for Hi-DPI displays
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- Mobile (and perhaps HTML5?) backend
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- More advanced graphical effects (e.g. blur)
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- Tests and benchmarks
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**Implementing these features will get us to the 1.0 release.** Contribute, so that it's as soon as
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possible!
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## Requirements
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If you're using Windows and having trouble building Pixel, please check [this
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guide](https://github.com/faiface/pixel/wiki/Building-Pixel-on-Windows) on the
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[wiki](https://github.com/faiface/pixel/wiki).
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[PixelGL](https://godoc.org/github.com/faiface/pixel/pixelgl) backend uses OpenGL to render
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graphics. Because of that, OpenGL development libraries are needed for compilation. The dependencies
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are same as for [GLFW](https://github.com/go-gl/glfw).
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The OpenGL version used is **OpenGL 3.3**.
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- On macOS, you need Xcode or Command Line Tools for Xcode (`xcode-select --install`) for required
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headers and libraries.
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- On Ubuntu/Debian-like Linux distributions, you need `libgl1-mesa-dev` and `xorg-dev` packages.
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- On CentOS/Fedora-like Linux distributions, you need `libX11-devel libXcursor-devel libXrandr-devel
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libXinerama-devel mesa-libGL-devel libXi-devel` packages.
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- See [here](http://www.glfw.org/docs/latest/compile.html#compile_deps) for full details.
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**The combination of Go 1.8, macOS and latest XCode seems to be problematic** as mentioned in issue
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[#7](https://github.com/faiface/pixel/issues/7). This issue is probably not related to Pixel.
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**Upgrading to Go 1.8.1 fixes the issue.**
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## Contributing
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Pixel is in, let's say, mid-stage of development. Many of the important features are here, some are
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missing. That's why **contributions are very important and welcome!** All alone, I will be able to
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finish the library, but it'll take a lot of time. With your help, it'll take much less. I encourage
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everyone to contribute, even with just an idea. Especially welcome are **issues** and **pull
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requests**.
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**However, I won't accept everything. Pixel is being developed with thought and care.** Each
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component was designed and re-designed multiple times. Code and API quality is very important here.
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API is focused on simplicity and expressiveness.
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When contributing, keep these goals in mind. It doesn't mean that I'll only accept perfect pull
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requests. It just means that I might not like your idea. Or that your pull requests could need some
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rewriting. That's perfectly fine, don't let it put you off. In the end, we'll just end up with a
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better result.
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Take a look at [CONTRIBUTING.md](CONTRIBUTING.md) for further information.
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For any kind of discussion, feel free to use our
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[Gitter](https://gitter.im/pixellib/Lobby)
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community.
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## License
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[MIT](LICENSE)
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