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FloodFill()
Fill a screen area with a colour
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Syntax
FloodFill( <hDC>, <nX>, <nY>, <nColour> )   -->   lSuccess

Arguments
<hDC> specifies the device context for a window.

<nX>, <nY> specify the position of the top left-hand corner of
the rectangle in pixels.

<nColour> is the colour of the boundary.  Use one of the pre-
defined colours (COLOR_* in WINDOWS.CH), or specify your own
using the RGB() macro.

Returns
If successful, logical TRUE (.T.) is returned, otherwise FALSE
(.F.) is returned.

Description
This function fills an area of a window bounded by the
<nColour> parameter, using the current brush.

The area begins at the position specified by <nX> and <nY>,
and extends in all directions to the colour boudary.

Example
FloodFill( hDC, 200, 200, RGB( 100, 100, 100 ) )