"Joystick" Control in GUI

[sentry07 1]

I would like to create a control in my GUI that acts like a joystick. My code so far:

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;Sony VISCA Camera Controller
#include <ButtonConstants.au3>
#include <ComboConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <SliderConstants.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>
#Region ### START Koda GUI section ### Form=D:\My Dropbox\AutoIT Scripts\Sony VISCA Controller\Form1.kxf
$Form1 = GUICreate("Form1", 477, 398)
$Group1 = GUICtrlCreateGroup("  Camera Configuration  ", 8, 8, 460, 105)
$Label1 = GUICtrlCreateLabel("Camera IP", 24, 32, 53, 17)
$cmbIPAddr = GUICtrlCreateCombo("", 24, 49, 161, 25)
$inpPort = GUICtrlCreateInput("", 200, 49, 81, 21)
$cmbModel = GUICtrlCreateCombo("", 296, 49, 153, 25, BitOR($CBS_DROPDOWNLIST,$CBS_AUTOHSCROLL))
GUICtrlSetData(-1, "BRC-300|BRC-330")
$Label2 = GUICtrlCreateLabel("Camera Port", 200, 32, 62, 17)
$Label3 = GUICtrlCreateLabel("Camera Model", 296, 32, 72, 17)
GUICtrlCreateGroup("", -99, -99, 1, 1)
$Button1 = GUICtrlCreateButton("Connect", 295, 80, 75, 25, $WS_GROUP)
GUICtrlSetState(-1, $GUI_DISABLE)
$Button2 = GUICtrlCreateButton("Disconnect", 375, 80, 75, 25, $WS_GROUP)
GUICtrlSetState(-1, $GUI_DISABLE)
$sldPanTilt = GUICtrlCreateSlider(8, 360, 150, 29)
GUICtrlSetLimit(-1, 15, 0)
$sldZoom = GUICtrlCreateSlider(160, 360, 150, 29)
GUICtrlSetLimit(-1, 7, 0)
$Label4 = GUICtrlCreateLabel("Pan/Tilt Speed", 16, 344, 76, 17)
$Label5 = GUICtrlCreateLabel("Zoom Speed", 168, 344, 65, 17)
$sldPanCtrl = GUICtrlCreatePic("", 158, 144, 161, 161, BitOR($SS_NOTIFY,$SS_SUNKEN,$WS_GROUP,$WS_BORDER,$WS_CLIPSIBLINGS))
$sldZoomCtrl = GUICtrlCreateSlider(328, 144, 33, 161, BitOR($TBS_VERT,$TBS_TOP,$TBS_LEFT,$TBS_BOTH,$TBS_NOTICKS,$TBS_ENABLESELRANGE))
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###

While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit

Case $sldPanCtrl
MsgBox(0,'Hey','Hey Pan Control changed.')

Case $sldZoomCtrl
MsgBox(0,'Hey','Hey Zoom Control changed.')
EndSwitch
WEnd

So, the $sldPanControl I just made a Pic element because I could make an empty clickable element. I'm sure it will have to change or something. Basically I'd like to create a handle in the center of that box and when it's clicked, _MouseTrap to the boundaries of the box and report back to a function the relative position from the center. Sounds hard. I'm not sure what kind of GUI control I'd even start with. I guess it would act like the AutoIT Window Info finder tool only confined to the control that it is in. Is that the correct direction for me to start?

[DynamoBen 0]

Did you ever finish this project? If so do you mind posting code?