Quicktime for Java Classes and Interfaces

This section discusses the usage of two principal classes and one principal interface in the QuickTime for Java API.

These are

QTCanvas

: As we saw in the our QTSimpleApplet, the QTCanvas is a subclass of the java.awt.Canvas and represents primarily a way to gain access to the underlying native graphics structure of the platform. QuickTime requires this in order to draw to the screen.

QTDrawable

:

an interface that expresses this requirement of QuickTime objects to draw to this native graphics structure.

QTFactory

: a class that uses the importing capabilities of QuickTime to ``manufacture'' QTDrawable objects to present that media.

In this section, we discuss how to

• use the QTCanvas class to interact with the Java display and event system
• use the QTDrawable interface to encapsulate common operations that can be applied to a QuickTime drawing object
• present media that QuickTime can import by using ``factory'' methods provided by the QTFactory class

The section also introduces briefly an abstraction known as a space, which is part of the QuickTime for Java spaces and controllers architecture. A space defines and organizes the behavior of objects and allows for the complex representation of disparate media types.