preprations to draw graph

kol wa7d sh3'al f filter ysheel el "//operation code " w y7ot mkano el
call ele by5le el 7et bt3to tsht3'lmen 3'er ama y3rd 7aga

PS:gui designer shoof tre2a ta5od beha el wMax w 3shan tst5dm el class
bta3 drawGraph call the function "draw()" MT3MLSH INSTANCE