GetWorldTransform - Visual FoxPro : Using Win32 (WinAPI) Functions


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	Coordinate Space and Transformation ..msdn

	ClientToScreen
	DPtoLP
	GetGraphicsMode
	GetMapMode
	GetWorldTransform
	LPtoDP
	ScreenToClient
	SetGraphicsMode
	SetMapMode


	Code examples:

GetWorldTransform
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Retrieves the current world-space to page-space transformation.

Code examples:

Declaration:

 
BOOL GetWorldTransform(
    HDC hdc,         // handle to device context
    LPXFORM lpXform  // transformation
);

FoxPro declaration:

 
DECLARE INTEGER GetWorldTransform IN gdi32;
    INTEGER hdc,;
    STRING @lpXform

Parameters:

hdc
[in] Handle to the device context.

lpXform
[out] Pointer to an XFORM structure that receives the current world-space to page-space transformation.

Return value:

If the function succeeds, the return value is nonzero.

Usage:

 
LOCAL hWindow, hDC, cBuffer
hWindow = _screen.HWnd
hDC = GetWindowDC(hWindow)
 
cBuffer = REPLICATE(CHR(0), 24)
= GetWorldTransform(m.hDC, @cBuffer)
 
* display XFORM members
? "eM11=", float2int(buf2dword(SUBSTR(cBuffer,1,4)))
? "eM12=", float2int(buf2dword(SUBSTR(cBuffer,5,4)))
? "eM21=", float2int(buf2dword(SUBSTR(cBuffer,9,4)))
? "eM22=", float2int(buf2dword(SUBSTR(cBuffer,13,4)))
? "eDx=", float2int(buf2dword(SUBSTR(cBuffer,17,4)))
? "eDy=", float2int(buf2dword(SUBSTR(cBuffer,21,4)))
 
= ReleaseDC(hWindow, hDC)

My comment:

Conversion function float2int is described in VFP Floating Point Data Type topic on FoxPro Wiki.

The SetWorldTransform function will fail unless the graphics mode for the given device context has been set to GM_ADVANCED by previously calling the SetGraphicsMode function.

See also: SetWorldTransform

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Created:	2007-04-30 13:32:17
Modified:	2007-06-11 16:30:01

Visited in last 7 days: 11


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