GUI ctrl menu bar offset for GDIPlus drawings

[AlmarM]

Hi!

I'm currently working on some GDIPlus drawing and I noticed a little offset in the Y when having a menu bar.

To clarify my issue, here is some example code.

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#include <GDIPlus.au3>

_GDIPlus_Startup()

Global $hPenBlack = _GDIPlus_PenCreate(0xFF000000), $hPenGray = _GDIPlus_PenCreate(0xFFCCCCCC)

$hGUI = GUICreate("(Untitled)", 200, 200)
$hFile = GUICtrlCreateMenu("File")
$hNew = GUICtrlCreateMenuItem("New", $hFile)
GUICtrlCreateMenuItem("", $hFile)
$hOpen = GUICtrlCreateMenuItem("Open", $hFile)
$hSave = GUICtrlCreateMenuItem("Save", $hFile)
$hSaveAs = GUICtrlCreateMenuItem("Save as..", $hFile)
GUICtrlCreateMenuItem("", $hFile)
$hExit = GUICtrlCreateMenuItem("Exit", $hFile)
GUISetState()

$hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
$hBitmap = _GDIPlus_BitmapCreateFromGraphics(200, 200, $hGraphic)
$hBackBuffer = _GDIPlus_ImageGetGraphicsContext($hBitmap)
_GDIPlus_GraphicsSetSmoothingMode($hGraphic, 2)

While 1
    Switch GUIGetMsg()
        Case -3
            Exit

    EndSwitch

    _GDIPlus_GraphicsClear($hBackBuffer, 0xFFFFFFFF)

    DrawGrid()

    _GDIPlus_GraphicsDrawImageRect($hGraphic, $hBitmap, 0, 0, 200, 200)
WEnd

Func DrawGrid()
    For $i = 0 To 200 Step 10
        _GDIPlus_GraphicsDrawLine($hBackBuffer, $i, 0, $i, 200, $hPenGray)
        _GDIPlus_GraphicsDrawLine($hBackBuffer, 0, $i, 200, $i, $hPenGray)
    Next

    Local $iHalfWidth = (200 / 2)
    Local $iHalfHeight = (200 / 2)

    _GDIPlus_GraphicsDrawLine($hBackBuffer, $iHalfWidth, 0, $iHalfWidth, 200, $hPenBlack)
    _GDIPlus_GraphicsDrawLine($hBackBuffer, 0, $iHalfHeight, 200, $iHalfHeight, $hPenBlack) ; HERE
EndFunc

 

As you can see, the the second black line being drawn has a slight offset downwards, this can be fixed by removing the menu bar.

Any ideas how to fix this without removing the menu bar?

Thanks in advance.

[UEZ]

The drawing is corrected by the gfx handle is moved approx. 20 px. down.

Just use 

$hGUI = GUICreate("(Untitled)", 200, 220)

and you will see it properly.

Br

UEZ

[AlmarM]

The drawing is corrected by the gfx handle is moved approx. 20 px. down.

Just use 

$hGUI = GUICreate("(Untitled)", 200, 220)

and you will see it properly.

Br

UEZ

I just noticed this myself, so weird.

Thanks for the heads-up!

Will it always be +/- 20px? Does this depend on the OS?

[UEZ]

You can check the GUI size with WinGetClientSize() and adjust the GUI appropriately.

Br,

UEZ