DPtoLP - 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:

DPtoLP
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Converts device coordinates into logical coordinates.

Code examples:

Declaration:

 
BOOL DPtoLP(
    HDC hdc,           // handle to device context
    LPPOINT lpPoints,  // array of points
    int nCount         // count of points in array
);

FoxPro declaration:

 
DECLARE INTEGER DPtoLP IN gdi32;
    INTEGER hdc,;
    STRING @lpPoints,;
    INTEGER nCount

Parameters:

hdc
[in] Handle to the device context.

lpPoints
[in/out] Pointer to an array of POINT structures. The x- and y-coordinates contained in each POINT structure will be transformed.

nCount
[in] Specifies the number of points in the array.

Return value:

If the function succeeds, the return value is nonzero.

My comment:

The conversion depends on the mapping mode of the device context, the settings of the origins and extents for the window and viewport, and the world transformation.

LOCAL hWindow, hDC, cBuffer
hWindow = _screen.HWnd
hDC = GetWindowDC(hWindow)

cBuffer = num2dword(100) + num2dword(100)
? DPtoLP(hDC, @cBuffer, 1)

? buf2dword(SUBSTR(cBuffer,1,4)),;
buf2dword(SUBSTR(cBuffer,5,4))

= ReleaseDC(hWindow, hDC)

See also: LPtoDP

Word Index links for the DPtoLP :

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Created:	2007-04-27 13:00:32
Modified:	2007-04-27 13:03:27

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