Mask ink trouble

Question

when using the mask ink, im wondering how to keep the mask
stationary as the sprite moves.. the way i am using it as soon as
the sprite with the bitmat mask applyed to it moves the mask moves
with it. i need the mask to remain in the same place so that the
sprite can move around and the mask hide different parts of the
sprite.
Thanks

Answer 1

You will need to change the regpoint of the mask member when
you move
the sprite. Mask ink in Director uses the cast member that is
next to
the member of the sprite that is set to use mask ink. This
method made
sense once upon a time, but is really difficult to work with
now.
Since the mask member is not actually represented on the
stage, it's
position is always relative to it's regpoint and the regpoint
of the
member it is masking. As you've seen, if you move the sprite
2 pixels to
the right, the mask moves the same distance. To keep the mask
in a
static location, you have to change it's regpoint as you move
the sprite.
Here's an example behavior:
property thisSprite -- the sprite to be animated
property thisMember -- the member of the sprite
property maskMember -- the member used as a mask
on beginSprite me
thisSprite = me.spriteNum
thisMember = sprite(thisSprite).member
maskMember = member(thisMember.memberNum + 1,
thisMember.castLib).name
end
on mouseUp me
sprite(thisSprite).locH = sprite(thisSprite).locH + 3
member(maskMember).regPoint = member(maskMember).regPoint -
point(3,0)
end
As you click on the sprite, it will move to the right and the
mask's
regpoint will be moved to the left, making the mask seem to
stay in
place as the sprite moves.
Does this help?
Rob
Rob Dillon
Adobe Community Expert
http://www.ddg-designs.com
412-243-9119
http://www.macromedia.com/software/trial/