SYNOPSIS
s = tostring(rect)
DESCRIPTION
A rectangle in string context returns a human readable representation of the rectangle coordinates.
RETURN VALUE
Returns a string in the form
W x H ± X ± Y.
ERRORS
Raises an error if rect is not a rectangle.
EXAMPLE
>
>
r = gfx.rect(10,20,30,40)
print (r)
30x40+10+10