About draw the line;

[ghjhf]

the data like {1:7:00,2:8:00,44:9:00,100:10:00,0:11:00,0:12:00,0:13:00}
if now is at 7:00，but i dont want to drwa the line if the time is more than 7:00，but i want to draw the Xaxis （the Xaxis—labe is 7,8,9,10,11,12,13)