CDC::ScaleViewportExt

  • 项目

virtualCSizeScaleViewportExt(intxNum**,intxDenom,intyNum,intyDenom);**

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