Clearing dynamically generated mc

Question

I'm still working on getting what I had working in AS2
working in AS3 - hehe looks like "***" doesn't it? I'm playing with
the drawing api sample provided by Adobe to try and work it all
out. My particular problems are based on getting things to work
with a MouseMove event. I'd be very grateful for any help you could
offer. Here's the code:

Answer 1

Ummm, thank you. I did have those two variables there already
I just hadn't bothered to include them. I did say I was using the
Adobe example to work it all out. What I'm trying to do, with no
success in AS 3.0 despite having it working perfectly in AS 2.0 is
draw a line constrained to the x axis. As the line is drawn I want
there to be a temporary clip with markers at each end and a
hairline between them that will stretch as the mouse is dragged
across the picture in the scrollpane. When the mouse is released
the tempporary line will disappear and the drawShape function will
draw the final black or white line. Also as the mouse is dragged
across the image in the scrollpane I need the textfield, pixel_tf,
to dynamically update and show how many pixels there are as they're
drawn. I then also want to have the clr_btn clear both the pixel
counter text field and the final line in case the line was
incorrect.
Thank you, I think I'm nearly there, but it's a lot harder to
do in AS 3.0 than it was in AS 2.0.