how to capture irregular picture?

[happytc 0]

Normally, the function of _ScreenCapture_Capture() can capture rectangle image. But how to capture polygon image?

I know rectangle image can be changed to polygon image through transparent color. but how to?

Please give a example.

[monoscout999 9]

I don`t get it well..

you capture the rectangle where the polygon is.

[JohnOne 1,589]

GDI voodoo.

[happytc 0]

Lots of capturing software(Such as PicPick, FSCapture) have one functionality, so-called FREEHAND capture. You can move mouse to get irregular orbit. Then they can capture a picture through the orbit.

If using au3, how to realize this functionality?

[happytc 0]

GDI voodoo.

I also knew using GDI+ could realize it.

But how to?

[monoscout999 9]

soo. let me explain what i get from this...

You capture a non Rectangular image from the screen.

The capture image is always a rectangle, so what you want is that the part of the image where is not the shape you want to capture, set to tranparent.

For ex.

The black part represents what you want to capture, the grey part represents tranparent areas.

[happytc 0]

soo. let me explain what i get from this...

You capture a non Rectangular image from the screen.

The capture image is always a rectangle, so what you want is that the part of the image where is not the shape you want to capture, set to tranparent.

For ex.

The black part represents what you want to capture, the grey part represents tranparent areas.

Yeah, I have known the principle it's just like you said. But I want to know how to realize it through GDI+

[monoscout999 9]

Sorry i ask for me... because i never do something like this...

so The problem is to recognizing the shape

Is this for a window?

Edited August 19, 2011 by monoscout999

[happytc 0]

Sorry i ask for me... because i never do something like this...

so The problem is to recognizing the shape

Is this for a window?

for current screen.

like following record(It's very cool)

Edited August 19, 2011 by happytc

[UEZ 1,094]

Try this (it is a fast hack!):

expandcollapse popup

;code by UEZ 2011
#include <Array.au3>
#include <Misc.au3>
#include <ScreenCapture.au3>
#include <WinAPI.au3>
#include <WindowsConstants.au3>
Opt("GUIOnEventMode", 1)

_GDIPlus_Startup()
$hHBitmap = _ScreenCapture_Capture("", 0, 0, @DesktopWidth, @DesktopHeight, False)
$hTexture = _GDIPlus_BitmapCreateFromHBITMAP($hHBitmap)
$hTextureBrush = DllCall($ghGDIPDll, "uint", "GdipCreateTexture", "hwnd", $hTexture, "int", 0, "int*", 0)
$hTextureBrush  = $hTextureBrush [3]
_WinAPI_DeleteObject($hHBitmap)

$hGUI = GUICreate("", @DesktopWidth, @DesktopHeight, 0, 0, $WS_POPUP, $WS_EX_TOPMOST)
GUISetState()
$hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
_GDIPlus_GraphicsDrawImage($hGraphic, $hTexture, 0, 0)
_GDIPlus_GraphicsSetSmoothingMode($hGraphic, 2)
$hPen = _GDIPlus_PenCreate(0xFFFF0000, 2)

Global $dll = DllOpen("user32.dll")

GUISetOnEvent(-3, "_Exit")

$exitloop = False
$min_x = @DesktopWidth
$min_y = @DesktopHeight
$max_x = 0
$max_y = 0
$mo = MouseGetCursor()
Global $aPoints[2^20][2]
$p = 1
GUISetCursor(14, 1, $hGUI)
While Sleep(100)
    $mxo = MouseGetPos(0)
    $myo = MouseGetPos(1)
    While _IsPressed("01", $dll) * Sleep(10)
        $mx = MouseGetPos(0)
        $my = MouseGetPos(1)
        _GDIPlus_GraphicsDrawLine($hGraphic, $mx, $my, $mxo, $myo, $hPen)
        $mxo = $mx
        $myo = $my
        $aPoints[$p][0] = $mx
        $aPoints[$p][1] = $my
        $min_x = Min($min_x, $mx)
        $min_y = Min($min_y, $my)
        $max_x = Max($max_x, $mx)
        $max_y = Max($max_y, $my)
        $p += 1
        $exitloop = True
    WEnd
    If $exitloop Then ExitLoop
WEnd
GUISetCursor($mo, 1, $hGUI)

ReDim $aPoints[$p][2]
$aPoints[0][0] = $p - 1

_GDIPlus_GraphicsDispose($hGraphic)
$new_w =  $max_x - $min_x
$new_h =  $max_y - $min_y
$hBitmap_Hidden = DllCall($ghGDIPDll, "uint", "GdipCreateBitmapFromScan0", "int", @DesktopWidth, "int", @DesktopHeight, "int", 0, "int", 0x0026200A, "ptr", 0, "int*", 0)
$hBitmap_Hidden = $hBitmap_Hidden[6]
$hContext = _GDIPlus_ImageGetGraphicsContext($hBitmap_Hidden)
_GDIPlus_GraphicsClear($hContext, 0xFFFFFFFF)

_GDIPlus_GraphicsFillPolygon($hContext, $aPoints, $hTextureBrush)
$hBitmap_Capture = _GDIPlus_BitmapCloneArea($hBitmap_Hidden, $min_x, $min_y, $new_w, $new_h)
;~ _GDIPlus_ImageSaveToFile($hBitmap_Capture, "Testc.jpg")

GUISetOnEvent(-3, "")
GUIDelete($hGUI)
$hGUI = GUICreate("Freehand Screen Capture by UEZ 2011", $new_w, $new_h)
GUISetState()
$hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
_GDIPlus_GraphicsDrawImage($hGraphic, $hBitmap_Capture, 0, 0)

GUISetOnEvent(-3, "_Exit")

_GDIPlus_BitmapDispose($hBitmap_Hidden)
_GDIPlus_BitmapDispose($hBitmap_Capture)
_GDIPlus_GraphicsDispose($hContext)

While Sleep(5000)
WEnd

Func Max($a, $b)
    If $a > $b Then Return $a
    Return $b
EndFunc

Func Min($a, $b)
    If $a < $b Then Return $a
    Return $b
EndFunc

Func _Exit()
    DllClose($dll)
    _GDIPlus_BrushDispose($hTextureBrush)
    _GDIPlus_PenDispose($hPen)
    _GDIPlus_BitmapDispose($hTexture)
    _GDIPlus_GraphicsDispose($hGraphic)
    _GDIPlus_Shutdown()
    GUIDelete($hGUI)
    $aPoints = 0
    Exit
EndFunc

Hold down lmb and draw something to the screen. Release lmb to capture the polygone area.

Br,

UEZ

PS: no Voodoo needed

Edited August 20, 2011 by UEZ

[wakillon 397]

@UEZ

Didn't see this little pearl !

Thanks.