RectF.Adjust (gb.clipper)
Sub Adjust ( Left As Float [ , Top As Float, Right As Float, Bottom As Float ] )
Shrink or expand the rectangle.
A positive argument will shrink the rectangle, whereas a negative one will expand it.
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If Top is not specified, it will take the value of the Left argument.
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If Right is not specified, it will take the value of the Left argument.
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If Bottom is not specified, it will take the value of the Top argument.