Any way to scroll the viewport of a cropped LDM?

Question

I’m modifying Openspark’s vertical scroll bar
example (
http://nonlinear.openspark.com/tips/oop/scrollBar/index.htm)
to allow both vertical and horizontal scroll bars on the same LDM.
Essentially these scripts cycle through every sprite in the LDM and
move them a given increment. It works well enough but I’m
banging my head against the wall thinking there must be a way to
modify the viewport of an LDM in similar fashion to scrolling an
MIAW with drawRect. Does anyone know some tricks or is moving every
sprite individually really the best way?

Answer 1

On ma, 2008-01-14 at 19:41 +0000, Applied CD wrote:
> I?m modifying Spenspark?s vertical scroll bar example
> (
http://nonlinear.openspark.com/tips/oop/scrollBar/index.htm)
to
> allow both
> vertical and horizontal scroll bars on the same LDM.
Essentially
> these scripts
> cycle through every sprite in the LDM and move them a
given
> increment. It works
> well enough but I?m banging my head against the wall
thinking there
> must be a
> way to modify the viewport of an LDM in similar fashion
to scrolling
> an MIAW
> with drawRect. Does anyone know some tricks or is moving
every
> sprite
> individually really the best way?
>
Hi again,
I dont have another solution for this.
I have done some experimenting, but can not find a way to
"change the
viewport" either.
I was hoping something like "tell sprite() to set the rect of
the
stage
to rect()" would work, but it sets the rect of the
main-stage, not the
rect of the LDM-stage. I think this is one of the
shortcomings of
LDM's.
Years ago there was an aticle on one of the Director lingo
sites about
linked Director movies, and the tricks you can play with
them.
But... you guessed it, I can not remember.
It was something with clocks... maybe google can help?
I even tried to use the Shockwave ActiveX, hoping it would
play the
extenal movie with scrollbars. But the only thing I get is an
immediate
Director crash. :(
The moving of the sprites is not that bad.
You can make 1 generic behaviour for all the sprites, that
moves the
sprite with an extra offset.
Something like:
property myStartLoc
global gOffset
on beginSprite me
myStartLoc = the loc of sprite(me.spriteNum)
end
on prepareFrame me
set the loc of sprite(me.spriteNum) to myStartLoc + gOffset
end
You can now change the value of gOffset right in the main
movie, to
move
all the sprites with this behaviour.
gOffset should be a rect.
Good luck,
let me know how it goes.
Richard.