line()

Draws a line on current screen with ink current color.

Syntax:
line( sx , sy , dx , dy )

sx
and sy are starting line point coordinates while dx and dy are ending line point coordinates.

Example:
for n = 1 to 100
    ink(rnd(16000000))
    line( rnd(640), rnd(480), rnd(640), rnd(480) )
    next
waitKey