On Jun 17, 2011, at 3:38 , Adrian Ward wrote:
>
> I'm just going to chip in and say that building a central state machine using
> the JavaScript Patch has been absolutely critical for us, and this is what
> sits at the heart of every interactive AV we've ever made in QC - without it
> you'll just get messy unmanageable noodles, no matter how clean you are with
> your macro patching and connection routing.
>
> It also helps to enforce an MVC paradigm on your project, which is a bit of
> an unusual approach within the QC ecosystem but I'm convinced is utterly
> crucial when making anything ambitious.
>
> Quite possibly my darkest, most sinking moments as a developer are when I see
> a myriad of XOR, NAND and OR logic patches tangled up with Math patches,
> Counters and other logic type things trying to control disparate elements
> that would be much easier achieved with a single cleanly written JS patch
> that spits out nice neat state values. People - Embrace the JS! It is your
> friend!
Boy, do I agree. You should see my current composition!
--
Rick
>
>
> Ade.
>
>
> On 17 Jun 2011, at 10:09, Alastair Leith wrote:
>
>> I like Achims State machine, here's another approach I made years ago before
>> my JS was useful.
>>
>> I've done this sort of thing where I have two registers and interpolate
>> between them. The registers are the two most recent items in a queue, so a
>> new item in pushes the registers if that makes sense. Can't find a
>> composition for that method.
>>
>> Also I did it for a structure of 3D attitudes/orientations of an object. I
>> have a comp for this. In this case the queue just track random index values,
>> again causing the index at the registers to shift along each time a new one
>> comes in.
>>
>> It's a juggling act that uses a pulsed timer (LFO sawtooth-ramp-up) to drive
>> interpolation patches and the queue; here is a demo composition I dug out
>> (minus the interesting bit that morphs a cube into a sphere and back).
>>
>> <Demo transitions between atitudes with a spinning cube.qtz>
>> <Rotational Positions.plist>
>>
>> NB The rotation position.plist is an XML file that needs to be in the same
>> folder as the comp to load.
>>
>> Best
>> Alastair
>>
>> On 17/06/2011, at 5:09 PM, Rick Mann wrote:
>>
>>> I've been doing these on-screen graphics for a web channel that covers
>>> space launches. We show a couple of different countdown clocks, as well as
>>> a block of ascent parameters.
>>>
>>> But for the last nine minutes of a shuttle launch, there's not much to
>>> show. I have a couple dozen events that occur at various times during the
>>> count. I want to display each one as it occurs. An event is just a text
>>> string describing the event ("APU Start," "Steering Test," etc.).
>>>
>>> My custom patch can either output each string on a output port, or output
>>> an array of structures that has the string and the associated time. The
>>> former is easier for me.
>>>
>>> How can I crossfade from the last event string to the next, especially when
>>> they come in rapid succession (perhaps more quickly than the crossfade
>>> duration)?
>>>
>>> I was doing a similar cross fade between a set of images, and it was a real
>>> pain to build the structure for it.
>>>
>>> Thanks for any suggestions,
>>> Rick
>>>
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>>
>> The machine does not isolate man from the great problems of nature but
>> plunges him more deeply into them.
>> Antoine de Saint-Exupery
>>
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