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CDC Class
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CDC::ScaleViewportExt

Visual Studio 2012

Modifies the viewport extents relative to the current values.

Copy 
virtual CSize ScaleViewportExt( 
   int xNum, 
   int xDenom, 
   int yNum, 
   int yDenom  
);
xNum

Specifies the amount by which to multiply the current x-extent.

xDenom

Specifies the amount by which to divide the result of multiplying the current x-extent by the value of the xNum parameter.

yNum

Specifies the amount by which to multiply the current y-extent.

yDenom

Specifies the amount by which to divide the result of multiplying the current y-extent by the value of the yNum parameter.

The previous viewport extents (in device units) as a CSize object.

The formulas are written as follows:

xNewVE = ( xOldVE * xNum ) / xDenom

yNewVE = ( yOldVE * yNum ) / yDenom

The new viewport extents are calculated by multiplying the current extents by the given numerator and then dividing by the given denominator.

Header: afxwin.h

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