drawLine()

To draw a line on the Graphics object, use:

drawLine(int x1, int y1, int x2, int y2)

This draws a line from (x1, y1) to (x2, y2) in the drawing area using the current pen color. As usual, the point (0,0) is the upper left corner of the drawing area.

It doesn't matter in which direction you draw the line. The end and the start of the line could be reversed.