LPtoDP.md

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Function name : LPtoDP

Group: Coordinate Space and Transformation - Library: gdi32

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Converts logical coordinates into device coordinates.

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Declaration:

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

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FoxPro declaration:

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

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Parameters:

hdc [in] Handle to the device context.

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

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

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Return value:

If the function succeeds, the return value is nonzero.

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Comments:

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)
? LPtoDP(hDC, @cBuffer, 1)

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

= ReleaseDC(hWindow, hDC)

See also: DPtoLP

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