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Armand

Area calculation

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Hi,

I've attached an example picture of a shape which i would like to calculate it's area. Let's say a user has marked this kind of shaped area on the screen and you need to run some calculations on it, like getting the area of it.

- How would you go about this problem?

Thanks in advance :)

area.png


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This is too vague. What do you mean exactly be area? The amount of black pixels? The amount of cm2? And what do you mean by "a user has marked this"? Does that mean you have the coordinates, dimensions and radii of the involved geometric shapes? (From the looks of it, two circles, a rectangle and a triangle...)


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@Valuater great response, way to go!
@SadBunny I have the whole coordinates and i need to calculate the area - by that i mean the number of pixels - I can convert these to whatever I want afterwards anyway.

I can also see circles and rectangles and such but how to i make a code to analyze and calculate that?!


[u]My Au3 Scripts:[/u]____________(E)Lephant, A Share download manager (RS/MU etc)Http1.1 Console, The Ez Way!Internet Reconnection Automation Suite & A Macro Recording Tool.SK's Alarm Clock, Playing '.MP3 & .Wav' Files._________________Is GOD a mistake of the Humanity Or the Humanity is a mistake of GOD ?!

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You'd be better off asking this question on a math or drafting forum rather than here. I don't see how this would pertain to AutoIt until you have the math or the algorithm needed to do it.


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Given that in the example case one has several geometric 2nd degree shapes (one could be considered a circle but another is clearly an ellipsis) partly overlapping asymetrically, I bet my keyboard that the mathematical solution will be either very complex or too complex to be expressed in what maths call "elementary functions". For instance, just computing the common part between the ellipsis and the square (admit it is one) is awful.

For the well-known goat and field problem (involving just two overlapping circles), see http://mathforum.org/library/drmath/view/51746.html
It was only in 1995 that a closed-form solution was discovered by Shepherd and van Eetvelt.

I'd go for the pedestrian way which is guaranteed to work whatever image is given: examine the bitmap row after row and accumulate the black pixels.


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I may not know what I am talking about, but if the pic above is an example, and the colors are going to be that dramatic, then why not just count the pixels in the image (all the same color) then figure out how many pixels are in a inch squared, and then create a ratio to solve

 

Actually after reading @jchd's last comment, I think we are on the same page

Edited by nitekram
spelling

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same.


,-. .--. ________ .-. .-. ,---. ,-. .-. .-. .-.
|(| / /\ \ |\ /| |__ __||| | | || .-' | |/ / \ \_/ )/
(_) / /__\ \ |(\ / | )| | | `-' | | `-. | | / __ \ (_)
| | | __ | (_)\/ | (_) | | .-. | | .-' | | \ |__| ) (
| | | | |)| | \ / | | | | | |)| | `--. | |) \ | |
`-' |_| (_) | |\/| | `-' /( (_)/( __.' |((_)-' /(_|
'-' '-' (__) (__) (_) (__)

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This example has the black area of the image containing 258668 pixels = 181.078826909677 square centimeters

#include <GDIPlus.au3>
#include <Array.au3>
#include <WinAPI.au3>
; http://www.autoitscript.com/forum/topic/131661-gdi-image-file-to-2d-array-and-vice-versa/page__view__findpost__p__917176
Opt("MustDeclareVars", 1)
Local $iW, $iH
_GDIPlus_Startup()
Dim $pixelarray, $iCounta, $iCountb
Local $file_in = "area_thumb.png" ; "Bckgrnd.jpg" ; "image1-before.jpg" ;
Local $file_out = "area_after.jpg"
_ImageFileToNumberWhitePixels($file_in, $pixelarray)
_GDIPlus_Shutdown()

Func _ImageFileToNumberWhitePixels($filename, ByRef $aArray)
    Local $Reslt, $stride, $format, $Scan0, $hImage
    Local $v_Buffer, $width, $height
    Local $i, $j

    $hImage = _GDIPlus_ImageLoadFromFile($filename)
    $iW = _GDIPlus_ImageGetWidth($hImage)
    $iH = _GDIPlus_ImageGetHeight($hImage)
    $Reslt = _GDIPlus_BitmapLockBits($hImage, 0, 0, $iW, $iH, $GDIP_ILMREAD, $GDIP_PXF32ARGB)
    ;Get the returned values of _GDIPlus_BitmapLockBits ()
    $width = DllStructGetData($Reslt, "width")
    $height = DllStructGetData($Reslt, "height")
    $stride = DllStructGetData($Reslt, "stride")
    $format = DllStructGetData($Reslt, "format")
    $Scan0 = DllStructGetData($Reslt, "Scan0")

    For $i = 0 To $iW - 1
        For $j = 0 To $iH - 1
            $v_Buffer = DllStructCreate("dword", $Scan0 + ($j * $stride) + ($i * 4))
            If Hex(DllStructGetData($v_Buffer, 1), 8) == "FFFFFFFF" Then
                $iCounta += 1
            Else
                $iCountb += 1
            EndIf
        Next
    Next
    _GDIPlus_BitmapUnlockBits($hImage, $Reslt)
    _GDIPlus_ImageDispose($hImage)

    ConsoleWrite("Width x Height = " & $iW & "x" & $iH & " = " & ($iW * $iH) & @LF)
    ConsoleWrite("WHite pixels + Non-white pixels  = " & $iCounta & " +  " & $iCountb & " = " & $iCounta + $iCountb & @LF)
    ConsoleWrite("Number of non-white pixels = " & $iCountb & @LF)
    ; Ref http://www.translatorscafe.com/cafe/units-converter/typography/calculator/pixel-%28X%29-to-centimeter-%5Bcm%5D/
    ConsoleWrite("If 1 pixel  = 0.02645833333333cm (x) x 0.02645833333333cm (y) , then" & @LF & $iCountb & " pixels = " & (0.2645833333333 * 0.2645833333333 * $iCountb) & " square centimeters " & @LF)
    Return
EndFunc   ;==>_ImageFileToNumberWhitePixels

Edit: Replaced 18107.8826909677 square centimeters

Edited by Malkey
Deciminal in wrong place. Definitely not a metre by a metre.

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      Hi,
      Please help me to beat the flashing of input field:
      #include <File.au3> #Include <GUIConstantsEx.au3> #include <StaticConstants.au3> #include <WindowsConstants.au3> #include <ColorConstants.au3> AutoItSetOption("MustDeclareVars", 1) HotKeySet("{ESC}", "Terminate") Local $i Local $sSourceFile, $sDestFileA, $sDestFile3, $sRunWaitA, $sParamsA, $sNewFileNameA, $sFileLogPath, $iFileSize, $ScriptNameWoExt Local $hGUI, $ProgressBar1, $Label, $Progress, $Progress1, $inpVal, $CheckKeepAlpha, $v1, $sNewFileName, $sDestFile, $sParams, $sRunWait, $LabelStatus, $bMover, $cMover, $qMover, $ExtractAlpha, $FlipY, $ExtractBlue Local $sDrive, $sFolder, $sFileName, $sExt ;path to image magick tools Local $sIMConv = 'magick.exe', $sIMPathFull = 'C:\Program Files\ImageMagick\', $sIMPath = FileGetShortName($sIMPathFull & $sIMConv) ;supported input file extensions Local $Exts = "tga|jpg|bmp|dds|png|tif|jpeg", $sPattern = "\.(?i:" & $Exts & ")", $ExtsPreview = " tga | jpg | bmp | dds | png | tif | jpeg " Local $ExtOutput = "jpg", $ExtOutput2 = "png" Local $LogDefaultSize = '70' If Not $CmdLine[0] Then MsgBox($MB_SYSTEMMODAL, "Usage", "Drop " & $ExtsPreview & " file(s)" & @LF & "on " & @ScriptName) ConsoleWrite("Usage: " & @ScriptName & " <file>" & @CRLF) Exit EndIf If $CmdLine[0] <> 0 Then If FileExists($sIMPath) Then ProcessFiles() Else MsgBox(0, $sIMConv & " not found", "File [" & $sIMPathFull & $sIMConv & "] not found" & @CRLF) ConsoleWrite("Download Image Magick: " & $sIMConv & " to use this tool." & @CRLF) EndIf Else MsgBox(0, "Usage", "Drop file(s) on " & @ScriptName) ConsoleWrite("Usage: " & @ScriptName & " <file>" & @CRLF) EndIf Func ProcessFiles() #Region ### START Koda GUI section ### Form= $hGUI = GUICreate("Converting to PNG", 300, 285, -1, -1, BitXOR($GUI_SS_DEFAULT_GUI, $WS_MINIMIZEBOX)) GUISetOnEvent($GUI_EVENT_CLOSE, "Terminate") ;PNG Option group $cMover = 0 Local $Group2 = GUICtrlCreateGroup("Options (PNG):", 8, 5+$cMover, 284, 56) $CheckKeepAlpha = GUICtrlCreateCheckbox("Keep alpha channel", 24, 30+$cMover, 130, 17) $FlipY = GUICtrlCreateCheckbox("Flip Vertical", 160, 30+$cMover, 130, 17) GUICtrlSetState($CheckKeepAlpha, $GUI_CHECKED) ;JPG Quality Input $qMover = 68 Local $Group1 = GUICtrlCreateGroup("Extraction options (JPG):", 8, 5+$qMover, 284, 86) $ExtractAlpha = GUICtrlCreateCheckbox("Extract alpha channel", 24, 28+$qMover, 130, 17) $ExtractBlue = GUICtrlCreateCheckbox("Extract blue channel", 160, 28+$qMover, 130, 17) $inpVal = GUICtrlCreateInput("90", 20, 56+$qMover, 260, 22) GUICtrlSetState($inpVal, $GUI_DISABLE) ;Buttons and bar $bMover = 92 $Label = GUICtrlCreateLabel("Press Convert to proceed", 20, 94+$bMover, 220, 20, $SS_LEFT) $LabelStatus = GUICtrlCreateLabel("Ready", 20, 153+$bMover, 220, 20, $SS_LEFT) $Progress1 = CreateProgress(20, 115+$bMover, 260, 20) Local $Button1 = GUICtrlCreateButton("Convert", 206, 150+$bMover, 75, 25) GUICtrlSetState ($Button1, $GUI_DEFBUTTON) ;Initializer GUISetState(@SW_SHOW) #EndRegion ### END Koda GUI section ### While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE ExitLoop Exit Case $ExtractAlpha or $ExtractBlue If _IsChecked($ExtractAlpha) or _IsChecked($ExtractBlue) Then GUICtrlSetState($inpVal, $GUI_ENABLE) Else GUICtrlSetState($inpVal, $GUI_DISABLE) EndIf Case $Button1 GUICtrlSetState($inpVal, $GUI_DISABLE) GUICtrlSetState($CheckKeepAlpha, $GUI_DISABLE) GUICtrlSetState($Button1, $GUI_DISABLE) MainLoop() ExitLoop Case Else ContinueLoop EndSwitch WEnd EndFunc ;==>ProcessFiles Func Settings() If _IsChecked($CheckKeepAlpha) Then $v1 = ' ' Else $v1 = ' ' & '-alpha off' & ' ' EndIf If _IsChecked($ExtractAlpha) Then ;Extracting JPG $sSourceFile = '"' & $sSourceFile & '"' $sNewFileNameA = ($sFileName & '_a.' & $ExtOutput) $sDestFileA = '"' & $sDrive & StringTrimRight($sFolder, 1) & '\' & $sNewFileNameA & '"' $sParamsA = '-channel A -separate -quality' & ' ' & GUICtrlRead($inpVal) & ' ' & '-colorspace sRGB' $sRunWaitA = $sIMPath & " " & $sSourceFile & " " & $sParamsA & " " & $sDestFileA EndIf ;Converting PNG $sNewFileName = ($sFileName & '.' & $ExtOutput2) $sDestFile = '"' & $sDrive & StringTrimRight($sFolder, 1) & '\' & $sNewFileName & '"' $sDestFile3 = $sDrive & StringTrimRight($sFolder, 1) & '\' & $sNewFileName $sParams = $v1 & '-colorspace sRGB' $sRunWait = $sIMPath & " " & $sSourceFile & " " & $sParams & " " & $sDestFile EndFunc ;==>Settings Func MainLoop() WriteLogFile() ConsoleWrite("File Log Path: " & $sFileLogPath & @LF) For $i = 1 To $CmdLine[0] $sSourceFile = $CmdLine[$i] _PathSplit($sSourceFile, $sDrive, $sFolder, $sFileName, $sExt) GUICtrlSetData($ProgressBar1, ($i / $CmdLine[0]) * 100) UpdateProgress($Progress1, ($i / $CmdLine[0]) * 100) GUICtrlSetData($Label, $sFileName & $sExt) GUICtrlSetState($LabelStatus, $GUI_ENABLE) GUICtrlSetColor($LabelStatus, $COLOR_BLACK) GUICtrlSetData($LabelStatus, 'Converting') Sleep(20) If StringRegExp($sExt, "\A" & $sPattern & "\z", 0) = 1 Then If FileExists($sSourceFile) Then Settings() ; function of settings ConsoleWrite("Full converting path: " & $sRunWaitA & @LF) If _IsChecked($ExtractAlpha) Then RunWait(@ComSpec & ' /c ' & $sRunWaitA, '', @SW_HIDE) EndIf RunWait(@ComSpec & ' /c ' & $sRunWait, '', @SW_HIDE) Else ConsoleWriteError("File [" & $sSourceFile & "] not found" & @CRLF) EndIf If FileExists($sDestFile3) Then LabelAnim(' .') LabelAnim(' . .') LabelAnim(' . . .') LabelAnim(' . . . OK') Sleep(20) Else LabelAnim(' .') LabelAnim(' . .') LabelAnim(' . . .') GUICtrlSetColor($LabelStatus, $COLOR_RED) LabelAnim(' . . . ERROR') UpdateLogFile() EndIf Else ; MsgBox(0, "Wrong extension", "Extension of file [" & $sFileName & "] is [" & $sExt & "] and not in" & @LF & "[" & $ExtsPreview & "]" & @CRLF) ConsoleWriteError("Extension of file [" & $sSourceFile & "] is [" & $sExt & "] and not in [" & $sPattern & "]" & @CRLF) ; Terminate() LabelAnim(' .') LabelAnim(' . .') LabelAnim(' . . .') GUICtrlSetColor($LabelStatus, $COLOR_RED) LabelAnim(' . . . Wrong Extension') UpdateLogFile() EndIf Next ; Retrieve the file size (in bytes) $iFileSize = FileGetSize($sFileLogPath) ConsoleWrite("FileLog size: " & $iFileSize & @LF) If $iFileSize < $LogDefaultSize Then FileDelete($sFileLogPath) ElseIf $iFileSize > $LogDefaultSize Then FileMove($sFileLogPath, @WorkingDir, $FC_OVERWRITE) EndIf GUICtrlSetData($Label, "Converting complete") Sleep(10) EndFunc ;==>MainLoop Func LabelAnim($Result) GUICtrlSetData($LabelStatus, 'Converting' & $Result) Sleep(12) EndFunc Func RemoveExt($Input) Local $ExtArray = StringSplit($Input, ".") Return StringReplace($Input, "." & $ExtArray[$ExtArray[0]], "", -1) EndFunc Func GetFileName($Input) Local $PathArray = StringSplit($Input, "\/") Return $PathArray[$PathArray[0]] EndFunc ;--------------------------------------------------------------- ;- Creating file in @tempdir ;--------------------------------------------------------------- Func WriteLogFile() ; Create a constant variable in Local scope of the filepath that will be read/written to. $ScriptNameWoExt = RemoveExt(GetFileName(@ScriptName)) $sFileLogPath = (@TempDir & '\' & '_' & $ScriptNameWoExt & '_errorlog_' & @YEAR & '_' & @MON & '_' & @MDAY & '_' & @HOUR & '_' & @MIN & '_' & @SEC & '_.txt') If FileExists($sFileLogPath) Then FileDelete($sFileLogPath) EndIf ; Create a temporary file to write data to. If Not FileWrite($sFileLogPath, "ImageMagick converter (" & $sIMConv & ") can't convert these files:" & @CRLF) Then MsgBox($MB_SYSTEMMODAL, "", "An error occurred whilst writing the temporary file.") Return False EndIf EndFunc ;--------------------------------------------------------------- ;- Update log file in @tempdir ;--------------------------------------------------------------- Func UpdateLogFile() ; Open the file for writing (append to the end of a file) and store the handle to a variable. Local $hFileOpen = FileOpen($sFileLogPath, $FO_APPEND) If $hFileOpen = -1 Then MsgBox($MB_SYSTEMMODAL, "", "An error occurred whilst writing the temporary file.") Return False EndIf ; Write data to the file using the handle returned by FileOpen. FileWriteLine($hFileOpen, ($sFileName & $sExt)) Sleep(20) ; Close the handle returned by FileOpen. FileClose($hFileOpen) EndFunc ;--------------------------------------------------------------- ;- Enhanced Progress widget ;--------------------------------------------------------------- Func CreateProgress($x, $y, $w, $h, $Label="") Dim $Progress[2] $Progress[0] = GuiCtrlCreateProgress($x, $y, $w, $h) ; this is progress bar $Progress[1] = GuiCtrlCreateLabel("---", $x+0, $y-21, '', '', $SS_RIGHT) ; this is percentage label GUICtrlSetFont($Progress[1], 11, 500, 0, "") GUICtrlSetBkColor($Progress[1], $GUI_BKCOLOR_TRANSPARENT) Return $Progress EndFunc Func UpdateProgress($ProgressID, $Percent, $Label="") GUICtrlSetData($ProgressID[0], $Percent) GUICtrlSetData($ProgressID[1], $Label & Round($Percent, 1) & "%") EndFunc Func _IsChecked($idControlID) Return BitAND(GUICtrlRead($idControlID), $GUI_CHECKED) = $GUI_CHECKED EndFunc ;==>_IsChecked Func Terminate() If WinGetHandle('') <> $hGUI Then HotKeySet('{ESC}') Send('{ESC}') HotKeySet('{ESC}', '_Close') Return EndIf GUIDelete() Exit EndFunc ;==>Terminate Exit(0) the problem caused by this area:
      Case $ExtractAlpha or $ExtractBlue If _IsChecked($ExtractAlpha) or _IsChecked($ExtractBlue) Then GUICtrlSetState($inpVal, $GUI_ENABLE) Else GUICtrlSetState($inpVal, $GUI_DISABLE) EndIf if I remove "or $ExtractBlue" and "or _IsChecked($ExtractBlue)" the input field is not flashing.
      p.s.: also my button don't work if I use OR for the "Case" condition.
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