# LÖVE-Nuklear

[Nuklear](https://github.com/Immediate-Mode-UI/Nuklear) module for the [LÖVE](https://love2d.org/) game engine.

Provides a lightweight immediate mode GUI for LÖVE games.

## Example
```lua
-- Simple UI example.

local nuklear = require 'nuklear'

local ui

function love.load()
	ui = nuklear.newUI()
end

local combo = {value = 1, items = {'A', 'B', 'C'}}

function love.update(dt)
	ui:frameBegin()
	if ui:windowBegin('Simple Example', 100, 100, 200, 160,
			'border', 'title', 'movable') then
		ui:layoutRow('dynamic', 30, 1)
		ui:label('Hello, world!')
		ui:layoutRow('dynamic', 30, 2)
		ui:label('Combo box:')
		if ui:combobox(combo, combo.items) then
			print('Combo!', combo.items[combo.value])
		end
		ui:layoutRow('dynamic', 30, 3)
		ui:label('Buttons:')
		if ui:button('Sample') then
			print('Sample!')
		end
		if ui:button('Button') then
			print('Button!')
		end
	end
	ui:windowEnd()
	ui:frameEnd()
end

function love.draw()
	ui:draw()
end

function love.keypressed(key, scancode, isrepeat)
	ui:keypressed(key, scancode, isrepeat)
end

function love.keyreleased(key, scancode)
	ui:keyreleased(key, scancode)
end

function love.mousepressed(x, y, button, istouch, presses)
	ui:mousepressed(x, y, button, istouch, presses)
end

function love.mousereleased(x, y, button, istouch, presses)
	ui:mousereleased(x, y, button, istouch, presses)
end

function love.mousemoved(x, y, dx, dy, istouch)
	ui:mousemoved(x, y, dx, dy, istouch)
end

function love.textinput(text)
	ui:textinput(text)
end

function love.wheelmoved(x, y)
	ui:wheelmoved(x, y)
end
```

## Building

Windows binaries are available for each [release](https://github.com/keharriso/love-nuklear/releases).

To build the library yourself, grab the code with:
```sh
$ git clone --recursive https://github.com/keharriso/love-nuklear.git
```

Next, you need to compile the code to a native Lua module.

### Compiling with CMake on Linux

1. First, ensure you have a C compiler and the `cmake` and `luajit` or `lua51-luajit` (for openSUSE) packages installed, as well as `libluajit-5.1-dev` (for Ubuntu/Debian), `luajit-devel` (for Fedora), or `lua51-luajit-devel` (for openSUSE) if your distro has one of these packages.
2. Create a new folder next to `love-nuklear` called `love-nuklear-build`.
3. Open a terminal inside `love-nuklear-build`.
4. Compile the library with
```sh
$ cmake -DCMAKE_BUILD_TYPE=Release ../love-nuklear
$ make
```
5. Locate `nuklear.so` in the build folder.

#### Via GNU Guix

LÖVE-Nuklear is also available as a [Guix](http://guix.gnu.org/) package, and can thus be directly downloaded and built via:
```
$ guix package --install love-nuklear
```

### Compiling with CMake and MinGW on Windows

1. Install [CMake](https://cmake.org/download/) and [MinGW](http://mingw.org/) or [MinGW-w64](https://mingw-w64.org/doku.php).
2. Download the source code for [LuaJIT](http://luajit.org/download.html).
3. Open a command window inside the LuaJIT folder (the one that contains "README").
4. Compile LuaJIT with
```sh
$ mingw32-make
```
5. Remember the path to `lua51.dll` inside the LuaJIT `src` folder.
6. Run the CMake GUI.
7. Click "Browse Source" at the top right, then select the `love-nuklear` folder.
8. Enter a path for the build folder. It should be separate from the source folder.
9. Press "Configure" at the bottom.
10. Select "MinGW Makefiles" from the generator drop list, then click "Finish".
11. You should receive an error. This is normal.
12. Open the LUA tree by clicking the triangle on the left.
13. Replace "LUA_INCLUDE_DIR-NOTFOUND" with the path to the LuaJIT `src` folder.
14. Replace "LUA_LIBRARY-NOTFOUND" with the path to `lua51.dll` inside the LuaJIT `src` folder.
15. Click "Generate" at the bottom.
16. Open a command window inside the build folder.
17. Compile with
```sh
$ mingw32-make
```
18. Locate `nuklear.dll` inside the build folder.

### Compiling with CMake and MSVC on Windows

1. Install [CMake](https://cmake.org/download/) and [Visual Studio](https://visualstudio.microsoft.com/).
Community or Express edition is sufficient.
2. Download the source code for [LuaJIT](http://luajit.org/download.html).
3. Open a Visual Studio Command Prompt (x86 or x64 depending on what architecture you need)
and set the current directory to the LuaJIT folder (the one that contains "README"). Also
remember this path.
4. At the VS Command Prompt, set your current directory to `src` then
execute `msvcbuild.bat`. This will create lua51.dll, lua51.lib, and luajit.exe
5. Now open new command prompt window inside the `love-nuklear` folder.
6. Type `set "LUA_DIR=<path to directory at step 3>"`
7. Then type `cmake -Bbuild -H. -A Win32 -DLUA_INCLUDE_DIR=%LUA_DIR%\src -DLUA_LIBRARY=%LUA_DIR%\src\lua51.lib -DCMAKE_INSTALL_PREFIX=%CD%\install`.
If you previously compile LuaJIT using x64 VS command prompt, replace `Win32` with `x64` at above command.
8. Then type `cmake --build build --config Release --target install` and you'll found `nuklear.dll` inside "install" folder.

## Documentation

A complete description of all functions and style properties, alongside additional examples, is available at the [LÖVE-Nuklear wiki](https://github.com/keharriso/love-nuklear/wiki).

## License

Copyright (c) 2016 Kevin Harrison, released under the MIT License (see LICENSE for details).