ScaleViewportExtEx

Overview

Group

Quick Info

Windows NT
Yes
Win95
Yes
Win32s
Yes
Import Library
gdi32.lib
Header File
wingdi.h
Unicode
No
Platform Notes
Windows 95: 16-bit coordinates only

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
);

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 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.

Remarks
The viewport extents are modified as follows:

xNewVE = (xOldVE * Xnum) / Xdenom

yNewVE = (yOldVE * Ynum) / Ydenom