Name
MovieClip._alpha Property — opacity of a clip or movie
Availability
Flash 4 and later
Synopsis
mc._alpha
Access
Read/write
Description
The floating-point _alpha
property specifies the
opacity (or conversely the transparency) of
mc
as a percentage—0 is completely
transparent whereas 100 is completely opaque. Setting the
_alpha
of mc
affects
the visual transparency of all clips nested inside
mc
but does not affect their
_alpha
properties. That is, if we have a clip,
square
, that contains another clip,
circle
, and we set
square._alpha
to 50, then
circle
will be 50% transparent on-screen but will
have an _alpha
of 100.
Usage
Note that setting the _alpha
of a movie clip
affects the aa
property of the object returned by
Color.getTransform( )
.
Example
ball._alpha = 60; // Make ball partially transparent ball._alpha = 0; // Make ball invisible
The following clip event handler makes a clip more transparent as the mouse moves down on the screen:
onClipEvent(enterFrame) { _alpha = 100 - (_root._ymouse / 400) * 100; }
See Also
The Color
Class;
MovieClip
._visible
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