Brush specifies the pattern, foreground color, and background color of a filled object, such as a circle or region. The Brush clause has the following syntax:
Brush (pattern, forecolor [, backcolor ]) The forecolor and backcolor arguments are both integers, representing 24-bit RGB color values.
Pattern is a number from 1 to 71. Note: Pattern number 1 is "no fill," and pattern number 2 is a solid fill. Pattern numbers 9-11 are reserved.
Note: To specify a transparent fill style, use pattern number three or larger, and omit the backcolor argument. For example: Brush( 5, 255)