Zoom In/Out Auto

Question

I'm doing a project in Macromedia Director MX 2004 (windows
xp). The project includes a gallery.
I would like to know how you can have a zoom in auto effect
when you rollover the mouse pointer on a thumbnail of the gallery
and a zoom out effect when you leave the thumbnail area (something
like the Bar Menu on Mac OS). Please! Any help would be useful!
Thanks

Answer 1

That is a terrible way to do your zoom effect. For several
reasons.
Using globals for the a,b,c, and d values is overkill. Unless
other
sprites need access to those values, it is better to use
properties, and
in fact, you can use a single property to store the entire
rect. Also,
you don't need to hard code the values. The way I did it will
store the
original rect that you set in authoring mode, so you can use
the same
behaviour without any changes on multiple sprites. Also,
doing your
scaling on mouseWithin is not a good idea for several
reasons. First
off, it is difficult to make it zoom back out since there is
no
opposite, like mouseNotWithin. Second, it messes up some time
based
animations, so using enterFrame like I did here is a better
method.
Basically, there is a property called pGrowing which is set
to 0 at
first. When it is 0, nothing happens. On enterFrame, it gets
set to 1.
As long as pGrowning is 1, then it will start to scale
upwards, until
it is 10 pixels larger in each direction, then pGrowing gets
set back to
0 so it stops growing.
And on mouseLeave, it gets set to -1 which means start
shrinking. And
the same process happens in reverse.
Watch for inadvertent line breaks... this should be exactly
35 lines of
code.
property pGrowing, pRect
on beginSprite me
pRect=sprite(me.spriteNum).rect
pGrowing=0
end
on mouseEnter me
cursor 280
pGrowing=1
end
on mouseLeave me
cursor -1
pGrowing=-1
end
on enterFrame me
case pGrowing of
1: --growing
if sprite(me.spriteNum).rect[1] = pRect[1]-10 then
pGrowing=0
else
sprite(me.spriteNum).rect =
sprite(me.spriteNum).rect+rect(-1,-1,1,1)
end if
-1: --shrinking
if sprite(me.spriteNum).rect[1] = pRect[1] then
pGrowing=0
else
sprite(me.spriteNum).rect =
sprite(me.spriteNum).rect-rect(-1,-1,1,1)
end if
end case
end