GDI+ window paint

[RobertKipling]

I'm designing a Windows side-bar right now, and everything was going pretty well, until I started working on the hands for the analog clock. Every time I "move" the clock or move a window over it, the hands disappear until another second ticks by.

How do I "stick" the hand graphics onto the window so they don't leave when something is dragged over it?

[Andreik]

I'm designing a Windows side-bar right now, and everything was going pretty well, until I started working on the hands for the analog clock. Every time I "move" the clock or move a window over it, the hands disappear until another second ticks by.

How do I "stick" the hand graphics onto the window so they don't leave when something is dragged over it?

Look in AutoIt install folder\Examples\GUI\Advanced\Clock.au3

There is a very nice clock example. You`ll find your answer in this example.

[Malkey]

Here is an example of one way of re-painting.

Hope it helps.

expandcollapse popup

#include <GDIPlus.au3>
#include <WinAPI.au3>
#include <GuiConstants.au3>
#include <WindowsConstants.au3>

Global $GuiSizeX = 180, $GuiSizeY = 180

$hGui = GUICreate("GDIPlus Example", $GuiSizeX, $GuiSizeY)
GUISetState()

_GDIPlus_Startup()
;  Double Buffer
$hGraphicGUI = _GDIPlus_GraphicsCreateFromHWND($hGui)
$hBMPBuff = _GDIPlus_BitmapCreateFromGraphics($GuiSizeX, $GuiSizeY, $hGraphicGUI)
$hGraphic = _GDIPlus_ImageGetGraphicsContext($hBMPBuff)
;End Double Buffer add-in 1 of 3

;Graphics here
_GDIPlus_GraphicsClear($hGraphic, 0xFFFFFF80)
$hBrush = _GDIPlus_BrushCreateSolid(0xFF0080FF)
_GDIPlus_GraphicsFillEllipse($hGraphic, 3, 3, 50, 90, $hBrush)

$hPen = _GDIPlus_PenCreate(0xFFFF0000, 2)
_GDIPlus_GraphicsDrawLine($hGraphic, 0, $GuiSizeX, $GuiSizeY, 0, $hPen)

;End of graphics

;  Double Buffer
GUIRegisterMsg(0xF, "MY_PAINT"); Register PAINT-Event 0x000F = $WM_PAINT (WindowsConstants.au3)
GUIRegisterMsg(0x85, "MY_PAINT") ; $WM_NCPAINT = 0x0085 (WindowsConstants.au3)Restore after Minimize.
_GDIPlus_GraphicsDrawImage($hGraphicGUI, $hBMPBuff, 0, 0)
;End Double Buffer add-on 2 of 3

While 1
    $msg = GUIGetMsg()
    Switch $msg
        Case $GUI_EVENT_CLOSE
            _GDIPlus_BrushDispose($hBrush)
            _GDIPlus_PenDispose($hPen)
            _GDIPlus_GraphicsDispose($hGraphic)
            _GDIPlus_GraphicsDispose($hGraphicGUI)
            _WinAPI_DeleteObject($hBMPBuff)
            _GDIPlus_Shutdown()         
            Exit            
    EndSwitch
WEnd

;Func to redraw on PAINT MSG, Double Buffer add-on 3 of 3
Func MY_PAINT($hWnd, $msg, $wParam, $lParam)
    ; Check, if the GUI with the Graphic should be repainted
    _GDIPlus_GraphicsDrawImage($hGraphicGUI, $hBMPBuff, 0, 0)
    _WinAPI_RedrawWindow($hGui, "", "", BitOR($RDW_INVALIDATE, $RDW_UPDATENOW, $RDW_FRAME)) ; , $RDW_ALLCHILDREN
    Return $GUI_RUNDEFMSG
EndFunc   ;==>MY_PAINT