Draw the brush rectangle
Draw a rectangle with a spot according to the information in the meta data.
draw_brush(layer, painter, data, meta)
- the painter of the layer on which to draw the brush
- the data created by
qdata; a brush object is in
brush(data); the color and line width of the brush are stored in this object
- the meta data (has a least these two components:
## see the source code of, e.g., qbar() for its usage
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