User Guide

417

CHAPTER 15

Working with Geometry

The flash.geom package contains classes that define geometric objects such as points,

rectangles, and transformation matrixes. You use these classes to define the properties of

objects that are used in other classes.

Contents

Using Point objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417

Using Rectangle objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420

Using Matrix objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .423

Example: Applying a matrix transformation to a display object . . . . . . . . . . . . . . . .428

Using Point objects

A Point object defines a Cartesian pair of coordinates. It represents location in a two-

dimensional coordinate system, where x represents the horizontal axis and y represents the

vertical axis.

To define a Point object, you set its

x and y properties, as follows:

import flash.geom.*;

var pt1:Point = new Point(10, 20); // x == 10; y == 20

var pt2:Point = new Point();

pt2.x = 10;

pt2.y = 20;