virtual CSize ScaleViewportExt( int xNum, int xDenom, int yNum, int yDenom );
Return Value
The previous viewport extents (in device units) as a CSize object.
Parameters
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.
Remarks
Modifies the viewport extents relative to the current values. 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.
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See Also CDC::GetViewportExt, CSize