ScaleViewportExtEx function (wingdi.h)

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

Syntax

BOOL ScaleViewportExtEx(
  [in]  HDC    hdc,
  [in]  int    xn,
  [in]  int    dx,
  [in]  int    yn,
  [in]  int    yd,
  [out] LPSIZE lpsz
);

[in] hdc

A handle to the device context.

[in] xn

The amount by which to multiply the current horizontal extent.

[in] dx

The amount by which to divide the current horizontal extent.

[in] yn

The amount by which to multiply the current vertical extent.

[in] yd

The amount by which to divide the current vertical extent.

[out] lpsz

A pointer to a SIZE structure that receives the previous viewport extents, in device units. If lpSize is NULL, this parameter is not used.

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

The viewport extents are modified as follows:


    xNewVE = (xOldVE * Xnum) / Xdenom 
    yNewVE = (yOldVE * Ynum) / Ydenom

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	wingdi.h (include Windows.h)
Library	Gdi32.lib
DLL	Gdi32.dll