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ScaleViewportExtEx info  Overview  Group

The ScaleViewportExtEx function modifies the viewport for a device context (DC) by using the ratios formed by the specified multiplicands and divisors.

BOOL ScaleViewportExtEx(

    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 viewport extents



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

Return Values

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 viewport extents are modified as follows:

    xNewVE = (xOldVE * Xnum) / Xdenom 

    yNewVE = (yOldVE * Ynum) / Ydenom 


See Also

GetViewportExtEx, SIZE

file: /Techref/os/win/api/win32/func/src/f74_17.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2022/5/26 01:08,

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