Motion trail mask

daperson

This clever little snippet enables you to produce drag and drop motion trails for anythingin your flash movie. Simply drag the clip into you flash program, alter the shape of active area of the clip, and run it, and everything that passes over it produces a motion trail. The trail works for literally anything in your flash program, if it’s visible and it passes over the clip’s active area, it will have a motion trail until it’s no longer over it. In the example above, i have simply made the active area the shape of a few common shapes, and written a simple particle engine (A free bonus!) that throws lots of coloured squares around.

Posted about 1 month ago

daperson

Whoops – small point – if you click on the flash movie above the particle engine stops – this had no effect on the motion trail overlay’s functionality (there’s nothing wrong with that), it just means the system that shows it off doesn’t work quite right.

Posted about 1 month ago

sanju1979

is it masking or what ?

Posted about 1 month ago

daperson

Sort of. It works by, on each frame, taking a snapshot of what’s on the screen, seeing which bits of it collide with the defined area of effect (which acts like a mask), and displays those pixels on a BitmapData object. Each frame the older images fade away a bit until they’ve gone. The reuslt is a motion trail which effects only where you tell it to. (Or everywhere – if you tell it to). Very handy XD.

Posted about 1 month ago

daperson

Gosh.. this is one unpopular file… Drag and Drop motion tails, people! Surely somebody wants that?!

Posted about 1 month ago