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Last updated 5/2/2011

Chapter 28: Matrix object

Availability

Flash MX 2004.

Description

The Matrix object represents a transformation matrix.

Property summary

The following properties are available for the Matrix object:

matrix.a

Availability

Flash MX 2004.

Usage

matrix.a

Description

Property; a floating-point value that specifies the (0,0) element in the transformation matrix. This value represents the

scale factor of the object’s x-axis.

Example

The a and d properties in a matrix represent scaling. In the following example, the values are set to 2 and 3, respectively,

to scale the selected object to two times its width and three times its height:

var mat = fl.getDocumentDOM().selection[0].matrix;

mat.a = 2;

mat.d = 3;

fl.getDocumentDOM().selection[0].matrix = mat;

You can rotate an object by setting the a, b, c, and d matrix properties relative to one another, where a = d and b =

-c. For example, values of 0.5, 0.8, -0.8, and 0.5 rotate the object 60º:

Property Description

matrix.a A floating-point value that specifies the (0,0) element in the transformation matrix.

matrix.b A floating-point value that specifies the (0,1) element in the matrix.

matrix.c A floating-point value that specifies the (1,0) element in the matrix.

matrix.d A floating-point value that specifies the (1,1) element in the matrix.

matrix.tx A floating-point value that specifies the x-axis location of a symbol’s registration point or the center of a

shape.

matrix.ty A floating-point value that specifies the y-axis location of a symbol’s registration point or the center of a

shape.

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Adobe Extending Flash Professional CS5 Manuale Utente Pagina 363

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