How to make a "torch" effect

In this tutorial I'm explaining the most basic way of doing it.

What's on stage?

Only 2 layers, the mask and the masked.



In layer 1, the masked one, I have an image and in layer 2, the mask, a MovieClip instanced as "torch".

The actionScript there is:

startDrag("torch", true);
Mouse.hide();

And that's all. With startDrag we tell the movie to drag our MovieClip with the mouse and then we hide our mouse.

Here you can see it in action