Expando Line

I’m having trouble crating a line whose width increases from 1 to 115 in a motion tween. It seems that as it increases in width, the line thickness also increases, which is annoying and I have no idea why this happens, anyway here is the process I use:

[list=1]
[]Create a line set width to 1
[
]Convert to a movie clip
[]Set initial keyframe for start of tween
[
]Set second keyframe for end of tween
[]With second keyframe still selected click on line and set width to 115
[
]Right click inbetween the two keyframes and select Create Motion Tween
[/list] Am I going about it totally the wrong way? Any help is much appreciated.
Thanks.

try creating a rectangle with a width of 1 that should maintain the proportions correctly.

use hairline

If you want a thicker line… its not going to happen uniformly (you’ll get the scaling you’ve experienced so far) - at least not using lines. You can use a thin filled rectangle and scale that, though. The only downside is that you have non-rounded ends/corners. If you’re only dealing with a single line, thats usually not a problem. With more interconnected lines you would need to make caps and/or joints to compensate.