Add some documentation

README.md

@@ -1,6 +1,7 @@
 # QUICKIE
 
-Quickie is an [immediate mode gui][IMGUI] library for [LÖVE][LOVE]
+Quickie is an [immediate mode gui][IMGUI] library for [LÖVE][LOVE]. Initial inspiration came from the article [Sol on Immediate Mode GUIs (IMGUI)][Sol]. You should check it out to understand how Quickie works.
+
 
 ## Example
 
@@ -49,8 +50,162 @@ Quickie is an [immediate mode gui][IMGUI] library for [LÖVE][LOVE]
 
 ## Documentation
 
+### Modules
+
+`gui = require 'quickie'`
+
+* Main module. Includes all other modules.
+
+`gui.core = require 'quickie.core'`
+
+* Core functionality: Input, display, widget internals, ...
+
+`gui.style = require 'quickie.style-default'`
+
+* Default widget style. May be replaced by custom style.
+
+`gui.Button = require 'quickie.button'`
+
+* Button widget.
+
+`gui.Slider = require 'quickie.slider'`
+
+* Slider widget.
+
+`gui.Slider2D = require 'quickie.slider2d'`
+
+* 2D slider widget.
+
+`gui.Label = require 'quickie.label'`
+
+* Label widget.
+
+`gui.Input = require 'quickie.input'`
+
+* Input box widget.
+
+`gui.Checkbox = require 'quickie.checkbox'`
+
+* Check box widget.
+
+### Widgets
+
+* Widgets are functions; they should return `true` if the state has changed.
+* Widgets don't manage state. That's your job.
+* Calling a widget function creates the widget for the current frame only.
+* Widgets will be shown using `gui.core.draw()`. See the example above.
+
+#### Button
+
+```lua
+function gui.Button(label, x,y,w,h, widgetHit, draw)
+```
+
+**Parameters:**
+
+* *string* `label`: Button label.
+* *numbers* `x,y,w,h`: Hit box.
+* *function* `widgetHit`: Custom mouse hit function *(optional)*.
+* *function* `draw`:  Custom widget style *(optional)*.
+
+**Returns:**
+
+* `true` if button was activated.
+
+**Hit test function prototype:**
+
+```lua
+function widgetHit(mouse_x, mouse_y, x,y,w,h)
+```
+
+**Style function prototype:**
+
+```lua
+function draw(state, title, x,y,w,h)
+```
+
+#### Slider
+
+```lua
+function gui.Slider(info, x,y,w,h, widgetHit, draw)
+```
+
+**Parameters:**
+
+* *table* `info`: Widget info table. Fields:
+ * *number* `info.value`: The slider value *(required)*.
+ * *number* `info.min`: Minimum value *(optional, default = 0)*.
+ * *number* `info.max`: Maximum value *(optional, default = max(value, 1))*.
+ * *number* `info.step`: Step for keyboard input *(optional, default = (max-min)/50)*.
+ * *boolean* `info.vertical`: Flags slider as vertical *(optional, default = false)*.
+* *numbers* `x,y,w,h`: Hit box.
+* *function* `widgetHit`: Custom mouse hit function *(optional)*.
+* *function* `draw`:  Custom widget style *(optional)*.
+
+**Returns:**
+
+* `true` if slider value changed.
+
+**Hit test function prototype:**
+
+```lua
+function widgetHit(mouse_x, mouse_y, x,y,w,h)
+```
+
+**Style function prototype:**
+
+```lua
+function draw(state, fraction, x,y,w,h, vertical)
+```
+
+#### Slider2D
+
 TODO
 
+#### Label
+
+TODO
+
+#### Input
+
+TODO
+
+#### Checkbox
+
+TODO
+
+### Core functions
+
+TODO
+
+
+## License
+
+Copyright (c) 2012 Matthias Richter
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+Except as contained in this notice, the name(s) of the above copyright holders
+shall not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
 
 [LOVE]: http://love2d.org
 [IMGUI]: http://www.mollyrocket.com/forums/viewforum.php?f=10
+[Sol]: http://sol.gfxile.net/imgui/