DPtoLP
The DPtoLP
function converts device coordinates into logical coordinates. 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.
BOOL DPtoLP(
|
HDC hdc, |
// handle to device
context |
|
LPPOINT lpPoints, |
// pointer to array
of points |
|
int nCount |
// count of points |
|
); |
|
Parameters
hdc
Identifies
the device context.
lpPoints
Points to an
array of POINT
structures. The x- and y-coordinates contained in each POINT structure
will be transformed.
nCount
Specifies the
number of points in the array.
Return Values
If the
function succeeds, the return value is nonzero.
If the
function fails, the return value is zero.
Remarks
The DPtoLP
function fails if the device coordinates exceed 27 bits, or if the converted
logical coordinates exceed 32 bits. In the case of such an overflow, the results
for all the points are undefined.
See Also