Converts an RGBA color plus alpha transparency to hex
Assumes: r, g, b are contained in the set [0, 255] and a in [0, 1] Returns: a 4 or 8 character rgba hex
Converts an RGBA color plus alpha transparency to hex
Assumes: r, g, b are contained in the set [0, 255] and a in [0, 1] Returns: a 4 or 8 character rgba hex