invert (Matrix.invert method) -- Flash CS3

Performs the opposite transformation of the original matrix. You can apply an inverted matrix to an object to undo the transformation performed when applying the original matrix.

Example

The following example creates halfScaleMatrix by calling the invert() method of doubleScaleMatrix, and then demonstrates that the two are Matrix inverses of one another, that is, matrixes that undo any transformations performed by the other. The example shows this inversion by creating originalAndInverseMatrix, which is equal to noScaleMatrix.

import flash.geom.Matrix;
import flash.geom.Transform;

var rectangleMc_0:MovieClip = createRectangle(20, 80, 0xFF0000);
var rectangleMc_1:MovieClip = createRectangle(20, 80, 0x00FF00);
var rectangleMc_2:MovieClip = createRectangle(20, 80, 0x0000FF);
var rectangleMc_3:MovieClip = createRectangle(20, 80, 0x000000);

var rectangleTrans_0:Transform = new Transform(rectangleMc_0);
var rectangleTrans_1:Transform = new Transform(rectangleMc_1);
var rectangleTrans_2:Transform = new Transform(rectangleMc_2);
var rectangleTrans_3:Transform = new Transform(rectangleMc_3);

var doubleScaleMatrix:Matrix = new Matrix(2, 0, 0, 2, 0, 0);
rectangleTrans_0.matrix = doubleScaleMatrix;
trace(doubleScaleMatrix.toString()); // (a=2, b=0, c=0, d=2, tx=0, ty=0)

var noScaleMatrix:Matrix = new Matrix(1, 0, 0, 1, 0, 0);
rectangleTrans_1.matrix = noScaleMatrix;
rectangleMc_1._x = 100;
trace(noScaleMatrix.toString()); // (a=1, b=0, c=0, d=1, tx=0, ty=0)

var halfScaleMatrix:Matrix = doubleScaleMatrix.clone();
halfScaleMatrix.invert();
rectangleTrans_2.matrix = halfScaleMatrix;
rectangleMc_2._x = 200;
trace(halfScaleMatrix.toString()); // (a=0.5, b=0, c=0, d=0.5, tx=0, ty=0)

var originalAndInverseMatrix:Matrix = doubleScaleMatrix.clone();
originalAndInverseMatrix.concat(halfScaleMatrix);
rectangleTrans_3.matrix = originalAndInverseMatrix;
rectangleMc_3._x = 300;
trace(originalAndInverseMatrix.toString()); // (a=1, b=0, c=0, d=1, tx=0, ty=0)

function createRectangle(width:Number, height:Number, color:Number):MovieClip {
    var depth:Number = this.getNextHighestDepth();
    var mc:MovieClip = this.createEmptyMovieClip("mc_" + depth, depth);
    mc.beginFill(color);
    mc.lineTo(0, height);
    mc.lineTo(width, height);
    mc.lineTo(width, 0);
    mc.lineTo(0, 0);
    return mc;
}