drawing tangent line on palm

sir as in figure i want to draw to draw a line on the palm print image,of any thickness,the centre is at centre point of four fingers leaving the index finger

Answer 1

[Fangjun Jiang]

use line() or annotation()

[Pat]

THANK U SIR,but dont know how to use this command,can u tell exactly how to use it

[Walter Roberson]

line([x1,x2],[y1,y2])

where (x1,y1) are the coordinates of the first point, and (x2,y2) are the coordinates of the endpoint.

Fangjun's answer presumes that you have already determined the position that you want the line.

[Pat]

sir if x1,y1 are the first point co-ordinate,ten please tell how to find it and also mention how to draw it at the centre of four fingerd vertically