Specifying colors by name

Common Graphics provides a selection of predefined named colors. The RGB values of these colors are stored in an internal database and can be referenced by name at any time by an application. A subset of these named colors is listed in the following table:

Table 21. A subset of the predefined named colors

aquamarine	black	blue
blue violet	brown	cadet blue
coral	cornflower blue	cyan
dark green	dark olive green	dark orchid
dark slate blue	dark slate gray	dark turquoise
dim gray	firebrick	forest green
gold	gray0	gray10
gray100	gray20	gray30
gray40	gray50	gray60
gray70	gray80	gray90
green	green yellow	indian red
khaki	light blue	light steel blue
lime green	magenta	maroon
medium aquamarine	medium blue	medium forest green
medium goldenrod	medium orchid	medium sea green
medium slate blue	medium spring green	medium turquoise
medium violet red	navy blue	orange
orange red	orchid	pale green
pink	plum	red
salmon	sandy brown	sea green
sienna	sky blue	slate blue
spring green	steel blue	tan
thistle	turquoise	violet
violet red	wheat	white
yellow

The RGB values of a named color can be looked up in the color database by sending the lookupColor: message to a CgScreen. The method is passed the color name to look up. The result is the corresponding CgRGBColor, if the color name was found in the database, or nil if the name was not found.

| color |

color := CgScreen default lookupColor: 'orange'.

Transcript cr; show: color printString.

This code prints a string such as aCgRGBColor(16rFFFF, 16rA5A5, 16r0000) on the Transcript Window. The actual values can differ, depending on the platform.