mask spritesheet and move

[nak3ddogs]

Helo

pls someone help me. i cant find a way to make this coin's dead animation.
i would mask this coin and after under that mask, move down and make not exist.
one of the problems is when i try to make a mask i got blackscreen.

 

in create():

 

var mask = game.make.bitmapData(150,150);

mask.fill(0, 0, 0);

 

but when it is succes(but not) then i dont know how to connect a mask to the object what is inside a group.

or at the start i have to mask the image and make object from it?

sry for my english. i :3

thx for any info

[lewster32]

This post covers basically the same topic:

 

http://www.html5gamedevs.com/topic/7600-problem-about-scrolling-part-of-a-screen/