#19 Problem in adding an arrow to a line

[Anonymous]

Once you add a straight line (say from x=0 to x=1) so the first end will stick to x=0. But when you add the arrow on the line, the end of the arrowed line will go beyond x=0 (might be x=0.5) so I have to shift the line again to make the very first end of the line on x=0. If the width of the line becomes larger, the case worser.
Anyway to fix it?