The value can be hex code, color name, or color array [r, g, b, a] (each component is in the 0 - 255 range).
If a color value (hex code, color name, or array) is provided, it is used as the global color for all objects.
If a function is provided, it is called on each object to retrieve its color.
Default: 0
The width of the outline of each rectangle.
If a number is provided, it is used as the outline width for all rectangles.
If a function is provided, it is called on each rectangle to retrieve its outline width.