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tcurran

Pixel-accurate string width and height

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tcurran

Here are two functions to provide pixel-accurate height and width dimensions for a given string.

The more commonly-used _GDIPlus_GraphicsMeasureString built-in UDF is problematic because it returns the width padded by roughly one en-space (for reasons related to the various ways Windows produces anti-aliased fonts).

These are AutoIt translations of Pierre Arnaud's C# functions, described in his CodeProject article "Bypass Graphics.MeasureString limitations"

The first is an all-purpose version that takes a window handle, string, font family, font size (in points), style, and (optionally) width of the layout column (in pixels) as parameters.

The second, more efficient version is intended for applications where GDI+ fonts are already in use, and takes handles to the existing graphics context, string, font, layout and format as parameters.

Both functions return a two-row array with the exact width [0] and height [1] of the string (in pixels).

EDIT: (Note that some of the same anti-aliasing measurement issues still apply. I did my best to work around them, but the output of the function may still be off by a pixel or two. Buyer beware.)

#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>

; #FUNCTION# ====================================================================================================================
; Name ..........: _StringInPixels
; Description ...: Returns a pixel-accurate height and width for a given string using a given font, style and size.
; Syntax ........: _StringInPixels($hGUI, $sString, $sFontFamily, $fSize, $iStyle[, $iColWidth = 0])
; Parameters ....: $hGUI                - Handle to the window.
;                  $sString             - The string to be measured.
;                  $sFontFamily         - Full name of the font to use.
;                  $fSize               - Font size in points (half-point increments).
;                  $iStyle              - Combination of 0-normal, 1-bold, 2-italic, 4-underline, 8-strikethrough
;                  $iColWidth           - [optional] If word-wrap is desired, column width in pixels
; Return values .: 2-row array. [0] is width in pixels; [1] is height in pixels.
; Author ........: Tim Curran; adapted from Pierre Arnaud's C# function
; Modified ......:
; Remarks .......: This version is longer and less efficient but works for all purposes.
; Related .......: <https://www.codeproject.com/Articles/2118/Bypass-Graphics-MeasureString-limitations>
; Link ..........:
; Example .......: Example-StringInPixels.au3
; ===============================================================================================================================
#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>

Func _StringInPixels($hGUI, $sString, $sFontFamily, $fSize, $iStyle, $iColWidth = 0)
    _GDIPlus_Startup()
    Local $hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI) ;Create a graphics object from a window handle

    Local $aRanges[2][2] = [[1]]
    $aRanges[1][0] = 0 ;Measure first char (0-based)
    $aRanges[1][1] = StringLen($sString) ;Region = String length

    Local $hFormat = _GDIPlus_StringFormatCreate()
    Local $hFamily = _GDIPlus_FontFamilyCreate($sFontFamily)
    Local $hFont = _GDIPlus_FontCreate($hFamily, $fSize, $iStyle)

    _GDIPlus_GraphicsSetTextRenderingHint($hGraphic, $GDIP_TEXTRENDERINGHINT_ANTIALIASGRIDFIT)
    _GDIPlus_StringFormatSetMeasurableCharacterRanges($hFormat, $aRanges) ;Set ranges

    Local $aWinClient = WinGetClientSize($hGUI)
    If $iColWidth = 0 Then $iColWidth = $aWinClient[0]
    Local $tLayout = _GDIPlus_RectFCreate(10, 10, $iColWidth, $aWinClient[1])
    Local $aRegions = _GDIPlus_GraphicsMeasureCharacterRanges($hGraphic, $sString, $hFont, $tLayout, $hFormat) ;get array of regions
    Local $aBounds = _GDIPlus_RegionGetBounds($aRegions[1], $hGraphic)
    Local $aWidthHeight[2] = [$aBounds[2], $aBounds[3]]

    ; Clean up resources
    _GDIPlus_FontDispose($hFont)
    _GDIPlus_RegionDispose($aRegions[1])
    _GDIPlus_FontFamilyDispose($hFamily)
    _GDIPlus_StringFormatDispose($hFormat)
    _GDIPlus_GraphicsDispose($hGraphic)
    _GDIPlus_Shutdown()

    Return $aWidthHeight
EndFunc   ;==>_StringInPixels


; #FUNCTION# ====================================================================================================================
; Name ..........: _StringInPixels_gdip
; Description ...: Returns a pixel-accurate height and width for a given string using a GDI+ font, layout and format
; Syntax ........: _StringInPixels_gdip($hGraphic, $sString, $hFont, $tLayout, $hFormat)
; Parameters ....: $hGraphic            - Handle to a GDI+ graphics object.
;                  $sString             - The string to be measured.
;                  $hFont               - Handle to a GDI+ font.
;                  $tLayout             - A $tagGDIPRECTF structure that bounds the string.
;                  $hFormat             - Handle to a GDI+ string format.
; Return values .: 2-row array. [0] is width in pixels; [1] is height in pixels.
; Author ........: Tim Curran; adapted from Pierre Arnaud's C# function
; Modified ......:
; Remarks .......: This much more efficient version is for use with GDI+ fonts
; Related .......:
; Link ..........: <https://www.codeproject.com/Articles/2118/Bypass-Graphics-MeasureString-limitations>
; Example .......: Example-StringInPixels.au3
; ===============================================================================================================================
#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>

Func _StringInPixels_gdip($hGraphic, $sString, $hFont, $tLayout, $hFormat)
    Local $aRanges[2][2] = [[1]]
    $aRanges[1][0] = 0 ;Measure first char (0-based)
    $aRanges[1][1] = StringLen($sString) ;Region = String length

    _GDIPlus_GraphicsSetTextRenderingHint($hGraphic, $GDIP_TEXTRENDERINGHINT_CLEARTYPEGRIDFIT)
    _GDIPlus_StringFormatSetMeasurableCharacterRanges($hFormat, $aRanges) ;Set ranges

    Local $aRegions = _GDIPlus_GraphicsMeasureCharacterRanges($hGraphic, $sString, $hFont, $tLayout, $hFormat) ;get array of regions
    Local $aBounds = _GDIPlus_RegionGetBounds($aRegions[1], $hGraphic)
    Local $aWidthHeight[2] = [$aBounds[2], $aBounds[3]]
    _GDIPlus_RegionDispose($aRegions[1])
    Return $aWidthHeight
EndFunc   ;==>_StringInPixels_gdip

 

_StringInPixels.au3

Example-StringInPixels.au3

Edited by tcurran
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2 * $iSize - 2, "float", $iH - 2 * $iSize - 2) DllCall($__g_hGDIPDll, "int", "GdipSetPenDashOffset", "handle", $hPen, "float", $fOffset) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen, "float", 1 + $iSize, "float", 1 + $iSize, "float", $iW - 2 * $iSize - 2, "float", $iH - 2 * $iSize - 2) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", 0, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", 0, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) / 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) / 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) - 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) - 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", 0, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", 0, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", 0, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", 0, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) / 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) / 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) _WinAPI_BitBlt($hDC, 0, 0, $iW, $iH, $hDC_backbuffer, 0, 0, $SRCCOPY) $fOffset += 0.5 _GDIPlus_GraphicsDispose($hCanvas) _WinAPI_SelectObject($hDC_backbuffer, $DC_obj) _WinAPI_DeleteDC($hDC_backbuffer) _WinAPI_DeleteObject($hHBitmap) _WinAPI_ReleaseDC($__g_hGUI_MarkArea, $hDC) _GDIPlus_PenDispose($hPen) _GDIPlus_PenDispose($hPen2) _GDIPlus_PenDispose($hPen3) _GDIPlus_BrushDispose($hBrush) EndFunc ;==>PlayBorderAnim Func WM_ERASEBKGND($hWnd, $iMsgm, $wParam, $lParam) ;suppress repainting to avoid flickering but causes some other side effects #forceref $iMsgm, $wParam, $lParam Local Const $hBrush = _WinAPI_CreateSolidBrush(0xEFCDAB) ;BGR format ;~ _WinAPI_RedrawWindow($__g_hGUI_MarkArea, 0, 0, BitOR($RDW_NOERASE, $RDW_NOCHILDREN, $RDW_NOFRAME, $RDW_VALIDATE)) _WinAPI_SetClassLongEx($__g_hGUI_MarkArea, $GCL_HBRBACKGROUND, $hBrush) _WinAPI_DeleteObject($hBrush) Return 0 EndFunc ;==>WM_ERASEBKGND  
      Just press the lmb and move your mouse. When lmb is released you can adjust the size of the window by dragging the white rectangle to any direction. Rmb will move the marked area.
      Press ESC to get the coordinates of the marked region.
      If you have any improvements, please post it here.
       
      Tested on Win10 x64 only.
       
    • Blois
      By Blois
      Hi Guis,
       
      I need to create keyboard shortcut to navigate the tabs and activate them, but I could not use the code below:
      #include <TabConstants.au3> #include <WindowsConstants.au3> #include <GuiTab.au3> #include <GUIConstantsEx.au3> HotKeySet("^{TAB}", "_TabRight") HotKeySet("^+{TAB}", "_TabLeft") $gui = GUICreate("test",450, 300) $Tab1 = GUICtrlCreateTab(20, 24, 425, 201) $TabSheet1 = GUICtrlCreateTabItem("Tabsheet 1") $lbContagemGrupos2 = GUICtrlCreateLabel("aaaa", 50, 50) GUICtrlSetColor(-1, 0x0000FF) GUICtrlCreateTabItem("") $TabSheet2 = GUICtrlCreateTabItem(" ") $TabSheet3 = GUICtrlCreateTabItem(" ") GUISetState() While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE ExitLoop EndSwitch WEnd Func _TabRight() $CurPos = _GUICtrlTab_GetCurSel($Tab1) _GUICtrlTab_SetCurSel($Tab1, $CurPos + 1) $tab = "$TabSheet" & $CurPos GUICtrlSetState($TabSheet1 + $CurPos, $GUI_SHOW) Return EndFunc Func _TabLeft() $CurPos = _GUICtrlTab_GetCurSel($Tab1) _GUICtrlTab_SetCurSel($Tab1, $CurPos - 1) $tab = "$TabSheet" & $CurPos GUICtrlSetState($TabSheet1 + $CurPos, $GUI_SHOW) Return EndFunc Exit  
      can you help me?
    • Pricehacker
      By Pricehacker
      Hello again!
      I have tried searching for quite some time now but couldn´t find a single working way to change the class of your GUI that doesn´t include changing it manually after its compilation.
      First or "AutoIt v3 GUI" is a pretty boring name tbh and i would like to spice it up a bit, also, and more importantly, I would like to identify my windows by something other than its title as it will change depending on some factors and im using two different programs independently as multi threading isn't supported.
      Any help is appreciated! Thank you!
    • xtcislove
      By xtcislove
      Hello, 
      i have a Problem with  _WinAPI_SetLayeredWindowAttributes, everything is working as excepted if u are on Windows 7.

      But if u are on Windows 10 the transparent background of a control is not clickable anymore. 

      Could someone help?

      Please see example below, put cmd.jpg into the same folder as Example.au3

      Please see trigger.jpg to see which sections are not clickable in Windows 10 (the red dots, the green dots are clickable) on Windows 7 the red ones and green ones are clickable.
       
      The same problem occurs if i use 
       
       
      Example.au3


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