Adobe Extending Flash Professional CS5 - Manual (Page 363)

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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.