GCOL integer-expression

Sets the current graphics colour. The colour value is given by integer-expression.

Colours are represented as a 32-bit value where each 8-bit segment corresponds to alpha, red, green, blue in that order.
Use the RGB function to create a colour value from three 0–255 components.

Remarks: GCOL affects graphics drawing only. For text colours see COLOUR and BACKGROUND.

Set a graphics colour then draw an outline circle

GCOL RGB(255,0,0)

CIRCLE 200, 150, 80, FALSE

Set a graphics colour then draw a filled rectangle

GCOL RGB(0,128,255)

RECTANGLE 50, 50, 120, 90

Each colour component is an integer in the range 0–255.
The current graphics colour is used by drawing statements such as LINE, CIRCLE, RECTANGLE, and PLOT.
GCOL does not affect the text foreground or background; use COLOUR and BACKGROUND for text.

See also: RGB, COLOUR, BACKGROUND