ActionScript for Flash MX: The Definitive Guide, Second Edition

NaN Global Property

This is the Title of the Book, eMatter Edition

Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.

Alphabetical Language Reference

|

711

Description

The floating-point _yscale property specifies the height of mc, relative to its original height,

expressed as a percentage. If

mc is an instance, its original height is the height of the

instance’s symbol in the Library. If

mc is a main movie, the original height is the height of

the movie at authoring time.

When the current height of

mc is the same as its original height, _yscale is 100. A _yscale of

200 doubles

mc’s height relative to its original height. A _yscale of 50 halves mc’s height

relative to its original height.

The

_yscale property scales a clip proportionately above and below its registration point.

To size a clip from above or below only, place all of the clip’s content above or below the

registration point in the clip’s symbol (this is a useful technique for creating vertical

preloader bars). When a clip’s

_yscale is set to a negative value, the clip is flipped verti-

cally, as if across a horizontal mirror running through its registration point (i.e., it becomes

a vertical mirror image of itself), after which the negative value is treated as a positive. To

flip a clip vertically without resizing it, set the clip’s

_yscale to –_yscale.

Example

// Double the height of ball_mc (the width remains unchanged)

ball_mc._yscale ...