在内存中先绘制好图像，再显示到屏幕，防止闪烁的尴尬，这种方法称作双缓冲。

#NoTrayIcon
#include <gdiplus.au3>
$hMain = GUICreate("直接绘图")
GUISetState(@SW_SHOW, $hMain)

_GDIPlus_Startup()
$hGraphics = _GDIPlus_GraphicsCreateFromHWND($hMain)
$hBrush = _GDIPlus_BrushCreateSolid(0xFF000080)

For $X = 0 To 400
        _GDIPlus_GraphicsClear($hGraphics, 0xFF000000)
        _GDIPlus_GraphicsFillRect($hGraphics, $X, 180, 40, 40, $hBrush)
        Sleep(10)
Next

_GDIPlus_BrushDispose($hBrush)
_GDIPlus_GraphicsDispose($hGraphics)
_GDIPlus_Shutdown()

;===================================================
$hMain = GUICreate("双缓冲绘图")
GUISetState(@SW_SHOW, $hMain)
_GDIPlus_Startup()
; 画图区
$hGraphics = _GDIPlus_GraphicsCreateFromHWND($hMain)
$hBitmap = _GDIPlus_BitmapCreateFromGraphics(400, 400, $hGraphics)
; 绘制存储器区域（缓冲区）
$hBackBuffer = _GDIPlus_ImageGetGraphicsContext($hBitmap)
$hBrush = _GDIPlus_BrushCreateSolid(0xFF000080)

For $X = 0 To 400
        ; 在缓冲器绘制操作
        _GDIPlus_GraphicsClear($hBackBuffer, 0xFF000000)
        _GDIPlus_GraphicsFillRect($hBackBuffer, $X, 180, 40, 40, $hBrush)
        ; 绘制屏幕
        _GDIPlus_GraphicsDrawImage($hGraphics, $hBitmap, 0, 0)
        Sleep(10)
Next
_GDIPlus_BrushDispose($hBrush)
_GDIPlus_GraphicsDispose($hBackBuffer)
_GDIPlus_BitmapDispose($hBitmap)
_GDIPlus_GraphicsDispose($hGraphics)
_GDIPlus_Shutdown()

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