* Set back color r-red, g-green, b-blue, a-alpha scalars.
* A channel value must be in range 0-255, so it can handle 256 possible values.
* Returns reference to this so it can be used in a stream.
typeof(this)setBackColor(ubyte r, ubyte g, ubyte b, ubyte a)
* Set back color r-red, g-green, b-blue, a-alpha scalars. * A channel value must be in range 0-255, so it can handle 256 possible values. * Returns reference to this so it can be used in a stream.