ScaleWindowExtEx info Overview Group

The ScaleWindowExtEx function modifies the window for a device context using the ratios formed by the specified multiplicands and divisors.

BOOL ScaleWindowExtEx(

HDC hdc,	// handle of device context
int Xnum,	// horizontal multiplicand
int Xdenom,	// horizontal divisor
int Ynum,	// vertical multiplicand
int Ydenom,	// vertical divisor
LPSIZE lpSize	// address of previous window extents
);

Parameters

hdc: Identifies the device context.
Xnum: Specifies the amount by which to multiply the current horizontal extent.
Xdenom: Specifies the amount by which to divide the current horizontal extent.
Ynum: Specifies the amount by which to multiply the current vertical extent.
Ydenom: Specifies the amount by which to divide the current vertical extent.
lpSize: Points to a SIZE structure. The previous window extents (in logical units) are placed in this structure. If lpSize is NULL, nothing is returned.

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

The window extents are modified as follows:

    xNewWE = (xOldWE * Xnum) / Xdenom 

    yNewWE = (yOldWE * Ynum) / Ydenom