Draw a line from x1,y1 to x2,y2. x1,y1,x2,y2 can be replaced by a n by 2 matrix for a longer line
Irudikatu marra x1,y1 puntutik x2,y2 puntura. x1,y1,x2,y2 ordez daiteke n bider 2 matrize batekin marra luzeagoa lortzeko