As I said, you can, simple do invisible sprites, then pin them on the point where you want that area checked.Yes it's doable to some extent (without circle collision support obviously), but it becomes a nightmare to manage if your sprite has animations. You need to create an entire new system through events to support animating the collisions.

And kiyoshi, actually you only need to add collision test between circle and polygon, since the other primitives like square and triangle are also polygons. I don't know about performance, but it surely would help cover some shapes uncoverable by a single collision polygon.

It would be great if it was possible to create a collision mask combining multiple primitives, this way more complex forms (like circle) would be possible to some extent.

Maybe something like this, where you could place, resize and rotate them at will:

Screen 01

Screen 02

To top-left corner use:

set X to scrollX - windowWidth/2

set Y to scrollY - windowHeight/2

R78 32 bit win7.

Description: expression editor doesn't allow to set the second parameter (b) of max(a,b) and min(a,b) to a variable. It drops an error: "Invalid Parameter - Parameter 2 of 'max': must be a number"

<img src="http://dl.dropbox.com/u/7871870/construct/bug-06.jpg" border="0" />

This happens in any expression, not just in the "Set text" like the example.

I must agree with what VampyricalCurse said about performance earlier. Html5 only runs OK in powerful machines. On old computers (sometimes not too old) they perform badly. Don't need to say anything about mobile. Currently, if you want your game to run smooth you need an audience with powerful hardware and restrict your creations to simple games heading the casual market. You can only have the liberty to create more elaborated games if your audience has top of line machines, and even then you don't get an ultra performance.

Then there's this paradox: the users who have powerful machines are mostly hardcore players for whom the casual games don't appeal that much, in the other hand the majority of casual audience have slow machines. It's a complicated situation for Html5.

I'm not an expert on the subject, but from what I can get it seems that besides fully supporting WebGL, the only thing that could make Html5 faster would be to drop javascript in favor of a faster language. But unfortunately I don't see that coming soon. :/

Hmm, pop-ups are annoying. I would rather put a comment in the parameters description explaining the performance hit.

I must say that I also miss the ability to use multiple frames and animations. Being able to spawn particles with random frames helps add variation as well as animated particles.

In 'Can't Turn It Off' I used a single object with multiple animations to make all the particles. It would be handy if the Particle plugin allowed the same.