wxLua Hello World

Summary

Output

Code

if not wx then require("wx") end -- (optional) explicitly load wxLua libraries

-- The "frame" is the main window
local my_frame = wx.wxFrame(wx.NULL,
			 wx.wxID_ANY,
			 "this is the title of the HelloWorld (tm) application",
			 wx.wxDefaultPosition,
			 wx.wxSize(640, 200), -- initial size of the window
			 wx.wxDEFAULT_FRAME_STYLE 
		      )
-- note, the frame is invisible unless shown.

-- The "panel" is a region inside the frame. By itself it is invisible.
local my_panel = wx.wxPanel(my_frame, wx.wxID_ANY)

-- The callback function will be called from wxLua
function my_redraw_callback(event)

   -- "my_dc" is a so-called "drawing context".
   -- This one is obtained from the panel.
   -- If we'd get one for a bitmap instead, we could save the window contents as image.
   -- Or similar for a printer dc to get the contents on paper.
   local my_dc = wx.wxPaintDC(my_panel)

   -- the "pen" draws the border of the rectangle
   local my_pen=wx.wxPen("black", 13, wx.wxLONG_DASH)
   -- the "brush" fills the area of the rectangle
   local my_brush=wx.wxBrush("yellow", wx.wxSOLID)

   -- set pen / brush on the device context
   my_dc:SetPen(my_pen)
   my_dc:SetBrush(my_brush, wx.wxSOLID)

   -- request the size of the panel, because we don't know the menu bar, window borders etc.
   local my_size=my_panel:GetSize()
   my_dc:DrawRectangle(10, 10, my_size:GetWidth()-20, my_size:GetHeight()-20) -- x, y, width, height

   my_dc:DrawText("Hello World", 200, 100);

   -- need to explicitly delete a dc when it is not needed anymore.
   my_dc:delete()
end

-- Tell wxlua to call "my_redraw_callback", whenever "my_panel" requires a redraw
my_panel:Connect(wx.wxEVT_PAINT, my_redraw_callback)

-- Show the window
my_frame:Show(true)

wx.wxGetApp():MainLoop() -- (optional) explicitly hand over control to wxLua

Discussion

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