Circular GUI?

[MyEarth]

Reading the help, sometimes i'll do it for learn new things, i have see this function and the relative example:

_WinAPI_CreateRoundRectRgn

And i have think, if i want to make a circular GUI starting from a perfect square GUI like? What kind of math calculation need to do?

Thanks for the help

 

Edited May 22, 2015 by MyEarth

[UEZ]

There is no math needed:

#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#include <WinAPI.au3>

Global Const $iW = 800, $iH = 800
Global Const $hGUI = GUICreate("Round GUI", $iW, $iH, -1, -1, $WS_POPUP)
GUISetBkColor(0x0)
Global Const $hRegion = _WinAPI_CreateRoundRectRgn(0, 0, $iW, $iH, $iW, $iH)
_WinAPI_SetWindowRgn($hGUI, $hRegion)
Global Const $iBtn_X = GUICtrlCreateButton("Exit", ($iW - 50) / 2, ($iH - 50) / 2, 50, 50)
GUISetState()

Do
    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE, $iBtn_X
            _WinAPI_DeleteObject($hRegion)
            GUIDelete()
            Exit
    EndSwitch
Until False

 

[MyEarth]

UEZ thanks. Can i clean the resource in this way? There are drawback?

_WinAPI_SetWindowRgn($hGUI, $hRegion)
_WinAPI_DeleteObject($hRegion) ;<<<<

Or i need to delete only when i close the GUI?

Edited May 22, 2015 by MyEarth

[UEZ]

I would release the object on close to be on the safe side.

[BinaryBrother]

Here is what the above GUI would look like.