line tracing

[Jim Hurley]

 Roger Guay wrote:

I would like to trace a line by moving a small brightly colored graphic
(say via an equation of motion).  This would require that I prevent the
screen from updating while the graphic is in motion.  I've done this in
other APDs but I can't seem to find the way to do it in RR.  Any ideas?

Thanks and Cheers, Roger

Roger,

Here is a quick and dirty script to simulate projectile motion. Create a button "ball" , preferably a radio button. The pencil tool follows the button across the screen leaving a line (parabola) in its wake.

on mouseUp
clean
put 3 into vx
put 4 into vy
put 200 into x
put 200 into y
put .1 into gravity
choose the pencil tool

repeat until y >200
set the loc of button "ball" to x,y
drag from round(x),round(y) to round(x+vx),round(y-vy)
add vx to x
add -vy to y --y coor is down on the screen
subtract gravity from vy
end repeat

choose the browse tool
end mouseUp

on clean
repeat until the number of images = 0
delete image 1
end repeat
end clean

--
Jim Hurley
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