Assigns a color to an object syntaxes setColor(elt, color) and setColor(elt, color, opacity) are allowed too
setColor(elt, color)
setColor(elt, color, opacity)
The color to be applied on the object (ignored if first arg is a params object, either mandatory)
Optional
opacity (0 to 1, ignored with options syntax)
Assigns a color to an object syntaxes
setColor(elt, color)andsetColor(elt, color, opacity)are allowed too