[SOLVED] GDI+ 360 Angle Scope

#include-once
#include <WinAPI.au3>
#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#include <StaticConstants.au3>
#include <Misc.au3>

_GDIPlus_Startup()
Opt("MouseCoordMode", 2)

;User Values
Global $i_WindAngle = -60 ;Time Unit is Milli-Secs. Angle in Degrees
Global $hGfx_Direction, $hMatrix = _GDIPlus_MatrixCreate() ;The Graphics where Animation and Direction Change will occur
Global $hGfx_DirectionBitmap, $hBmp_Direction;The Bitmap and Bitmap Graphic object of the Direction control.
;...-------===============================================

OnAutoItExitRegister("Dispose")

;Create Pen for drawing direction
Global $hPen = _GDIPlus_PenCreate(0xFF00FFAB)
Global $hArrowCap = _GDIPlus_ArrowCapCreate(5, 3)
_GDIPlus_PenSetCustomEndCap($hPen, $hArrowCap)
;...-------===============================================

;Create the GUI for Animation.
Global $hGUI = GUICreate("GDI+ Test", 300, 150)

GUICtrlCreateLabel("WindAngle:", 10, 82)

Global $iInput = GUICtrlCreateInput($i_WindAngle, 75, 80, 80)

Global $iDirection = GUICtrlCreateLabel("", 170, 40, 90, 90, $SS_BITMAP)
Global $hDirection = GUICtrlGetHandle(-1)
GUICtrlSetCursor(-1, 0)

$hGfx_Direction = _GDIPlus_GraphicsCreateFromHWND($hDirection)
$hBmp_Direction = _GDIPlus_BitmapCreateFromGraphics(90, 90, $hGfx_Direction)
$hGfx_DirectionBitmap = _GDIPlus_ImageGetGraphicsContext($hBmp_Direction)

_GDIPlus_MatrixTranslate($hMatrix, 45, 45)
_GDIPlus_MatrixRotate($hMatrix, $i_WindAngle)

ChangeDirection(1)

GUIRegisterMsg($WM_CTLCOLORSTATIC, "WM_CTLCOLORSTATIC")
GUISetState()

Local $iTimeMsg

While $iTimeMsg <> $GUI_EVENT_CLOSE
$iTimeMsg = GUIGetMsg()

Switch $iTimeMsg

Case $iDirection
GUICtrlSetState($iDirection, $GUI_DISABLE)
;Change the Pointing Arrow
While _IsPressed("01")
Sleep(10)
WEnd
ChangeDirection()

GUICtrlSetState($iDirection, $GUI_ENABLE)
EndSwitch

WEnd
;...-------===============================================

Exit

Func ChangeDirection($iDraw = 0)
;If draw is required return immediately
If $iDraw Then
_GDIPlus_GraphicsSetTransform($hGfx_DirectionBitmap, $hMatrix)
_GDIPlus_GraphicsDrawLine($hGfx_DirectionBitmap, 0, 0, 45, 0, $hPen)
_WinAPI_RedrawWindow($hDirection)
Return 1
EndIf

;Trap the Mouse to the ClientWin
Local $tPoint = DllStructCreate($tagPoint)
DllStructSetData($tPoint, 1, 0)
DllStructSetData($tPoint, 2, 0)
_WinAPI_ClientToScreen($hGUI, $tPoint)

_MouseTrap( DllStructGetData($tPoint,1), DllStructGetData($tPoint,2), DllStructGetData($tPoint,1) + _WinAPI_GetClientWidth($hGUI), DllStructGetData($tPoint,2) + _WinAPI_GetClientHeight($hGUI))

Local $nAngle = 0, $aDirectionPos = ControlGetPos($hGUI, '', $iDirection)
Do
;Clear the Bimap
_GDIPlus_GraphicsClear($hGfx_DirectionBitmap, 0xFFF0F0F0)

;Get the Angle suspended with the Mouse
$nAngle = Radian2Degree(ATan(Abs(MouseGetPos(1) - $aDirectionPos[1]) / Abs(MouseGetPos(0) - ($aDirectionPos[0] + $aDirectionPos[2] / 2))))
_GDIPlus_MatrixRotate($hMatrix, $nAngle) ;Rotate it
_GDIPlus_GraphicsSetTransform($hGfx_DirectionBitmap, $hMatrix) ;Show changes in the Graphics
_GDIPlus_GraphicsDrawLine($hGfx_DirectionBitmap, 0, 0, 45, 0, $hPen) ;Draw the Arrow
_WinAPI_RedrawWindow($hDirection) ;Show the changes in the Control

;Change the Angle in the Input
GUICtrlSetData($iInput, Round($nAngle, 2))

;Matrix Reset Angles
_GDIPlus_MatrixRotate($hMatrix, -$nAngle)

;For Degugging purposes only
ToolTip($nAngle)
Until _IsPressed("01") ;Exit when clicked again

ToolTip("")
_MouseTrap()
EndFunc ;==>ChangeDirection

Func Degree2Radian($iDegree)
Return ACos(-1) * $iDegree / 180
EndFunc ;==>Degree2Radian

Func Radian2Degree($iRadian)
Return 180 * $iRadian / ACos(-1)
EndFunc ;==>Radian2Degree

Func WM_CTLCOLORSTATIC($hWnd, $iMsg, $wParam, $lParam)
If $hDirection = $lParam Then
_GDIPlus_GraphicsDrawImage($hGfx_Direction, $hBmp_Direction, 0, 0)
Return _WinAPI_GetStockObject($HOLLOW_BRUSH) ;Msg Handled
EndIf
EndFunc ;==>WM_CTLCOLORSTATIC

Func Dispose()
GUIDelete($hGUI)

;Memory Release
_GDIPlus_PenDispose($hPen)
_GDIPlus_ArrowCapDispose($hArrowCap)
_GDIPlus_MatrixDispose($hMatrix)
_GDIPlus_GraphicsDispose($hGfx_DirectionBitmap)
_GDIPlus_ImageDispose($hBmp_Direction)
_GDIPlus_GraphicsDispose($hGfx_Direction)
_GDIPlus_Shutdown()
EndFunc ;==>Dispose