grdraw
(grdraw start end color [flag])
The grdraw function draws a vector between two points to the current viewport, using the specified color.
The vector drawn on the graphics screen is not written to the drawing database.
Arguments
start
Startpoint of the vector expressed in coordinates of the current CCS.
end
Endpoint of the vector expressed in coordinates of the current CCS.
color
Number in the range of 0 through 255 to specify the color the vector is drawn.
flag
If this parameter is set to a number other than 0, the function highlights the vector; otherwise, the function draws the vector in normal mode.
Return Value
If the function succeeds, it returns T; otherwise, the function returns nil.
(grdraw '(0 0) '(10 10) 2)
grclear