LPugl is a minimal Lua-API for building GUIs. It is based on Pugl, a minimal portable API for embeddable GUIs.

LPugl provides only a very minimal API. See lwtk (Lua Widget Toolkit) for implementing GUI widgets on top of LPugl.

• X11
• Windows
• Mac OS X

• Cairo (requires OOCairo)
• OpenGL

Thanks to the modular architecture of Pugl, more rendering backends could be possible in the future. Different rendering backends can be combined in one application and also in the same window by embedding different view objects.

• lpugl - platform specific base module
• lpugl.cairo - Cairo rendering backend module
• lpugl.opengl - OpenGL rendering backend module

• Documentation
• Examples

• Simple example for using the Cairo backend:

  local lpugl = require"lpugl.cairo"
  
  local world = lpugl.newWorld("Hello World App")
  
  local view = world:newView {
      title     = "Hello World Window",
      resizable = true
  }
  view:setSize(300, 100)
  view:setEventFunc(function(event, ...)
      print(event, ...)
      if event == "EXPOSE" then
          local cairo = view:getDrawContext()
          local w, h  = view:getSize()
          cairo:set_source_rgb(0.9, 0.9, 0.9)
          cairo:rectangle(0, 0, w, h)
          cairo:fill()
          cairo:set_source_rgb(0, 0, 0)
          cairo:select_font_face("sans-serif", "normal", "normal")
          cairo:set_font_size(24)
          local text = "Hello World!"
          local ext = cairo:text_extents(text)
          cairo:move_to((w - ext.width)/2, (h - ext.height)/2 + ext.height)
          cairo:show_text(text)
      elseif event == "CLOSE" then
          view:close()
      end
  end)
  
  view:show()
  
  while world:hasViews() do
      world:pollEvents()
      world:dispatchEvents()
  end