Adobe Extending Flash Professional CS4 Manual do Utilizador descarregar pdf (Página 347)

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Chapter 27: Math object

Availability

Flash MX 2004.

Description

The Math object is available as a read-only property of the flash object; see fl.Math. This object provides methods that

perform common mathematical operations.

Method summary

The following methods are available for the Math object:

Math.concatMatrix()

Availability

Flash MX 2004.

Usage

Math.concatMatrix(mat1, mat2)

Parameters

mat1, mat2 Specify the Matrix objects to be concatenated (see Matrix object). Each parameter must be an object with

fields a, b, c, d, tx, and ty.

Returns

A concatenated object matrix.

Description

Method; performs a matrix concatenation and returns the result.

Example

The following example stores the currently selected object in the elt variable, multiplies the object matrix by the view

matrix, and stores that value in the

mat variable:

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

var mat = fl.Math.concatMatrix( elt.matrix , fl.getDocumentDOM().viewMatrix );

Method Description

Math.concatMatrix() Performs a matrix concatenation and returns the result.

Math.invertMatrix() Returns the inverse of the specified matrix.

Math.pointDistance() Computes the distance between two points.

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