May 2001
Intermediate to advanced
720 pages
23h 24m
English
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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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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.