This book by Derrick Ypenburg is a great reference manual for the seasoned Flash and ActionScript programmer and a good starter book for the novice.

One of the nice things about Flash OOP is the many pre-built classes. These classes can be thought of as built-in blocks of code. Some of the most useful are the classes used for programming animation because the complicated mathematics is already programmed for you.

We are ready to code the ActionScript to run the animation. First, we will add an Event Listener to listen for a mouse click. When a mouse click occurs, a function will run that will create the Tween.

This tutorial is about the ActionScript tween method. You will use this method when you need more control over the tween than you have with the Timeline method.

Now that we have programmed the envelope flap in our Flash animation to appear fully open above the envelope when the stamp button is clicked, we need to refine the animation to make it appear that the flap is slowly opening. We will do this by controlling two properties of the flap object.

A few of my readers wanted to know how to create the popular Flash animation which shows an envelope opening. In this tutorial, we will create that animation and program it to begin when the stamp on the envelope is clicked.