Circular movements of an oil drum. Covers the underlying
picture.
The options are as follows:
x_offset
The barrels revolve around the point specified by x_offset and
y_offset
x_offset y_offset
Valid values for each range from 0-512
EXAMPLES
oil 1
oil
The first example uses the default y_offset (256) but sets the
moves the center of rotation to the left edge. In the second
example, the barrel will rotate around the center point of the view
frame.
