Processing 1.0 - Processing Discourse - framerate and time calculation

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Index › Programming Questions & Help › Syntax Questions › framerate and time calculation

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framerate and time calculation (Read 615 times)

framerate and time calculation
Aug 15^th, 2008, 3:56pm

hi,

i've another little problem with processing, i've a timeline where i want to see the real time, i supposed to do that in this simple way, that function return something like the time in milliseconds.

public float getTime() {
return (FRAME_COUNTER*1000/FRAME_RATE);
}

i incrase the FRAME_COUNTER everytime that the draw function is called, but this function dosen't return the real time, it depends on frame rate, more high it is and more slow my timeline slide.

also i used FRAME_COUNTER*1000 because i cannot get the float value from the operation, why? i need something really precise.

I'm working on a software to synchronize visual effects and sounds track then i cannot loose time between the sequence.

Thanks.

Andrea

fry YaBB Moderator Offline Posts: 2623 mass, usa	Re: framerate and time calculation Reply #1 - Aug 15^th, 2008, 4:22pm Use frameCount and millis(), this is already handled for you. The division problem is described in Help -> Troubleshooting: http://processing.org/reference/troubleshooting/index.html#integers

q Junior Member Offline Posts: 58	Re: framerate and time calculation Reply #2 - Aug 15^th, 2008, 5:14pm thank you.

Re: framerate and time calculation
Reply #3 - Aug 15^th, 2008, 7:21pm

with millis() i've some problems because it's not precise i mean that i tried to use millis() and an offset to know when my sequence started.

millis count the time since starting an applet but i need the that this time is 0 when i run my sequence, using and offset like this one

void draw() {
if (running){
if (cube.seqs.length>0) {
Frame f = cube.getNextFrame();
drawMatrix(f);
FRAME_COUNTER ++;
}
}else {start_time = millis();}
franky.drawTimeline();
}

i loose just a few milliseconds, can i do that with more precision?

toxi Full Member Offline Posts: 203	Re: framerate and time calculation Reply #4 - Aug 17^th, 2008, 6:42pm Hey, you might want to have a look at a solution I've posted over here for a slightly different context (but should be helpful anyhow): http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Syntax;action=display;num=1213599231;start=2#2 Hope that helps!
	postspectacular.com \| toxi.co.uk

q Junior Member Offline Posts: 58	Re: framerate and time calculation Reply #5 - Aug 17^th, 2008, 7:13pm hi your solution seems interesting, also in order to dont's loose some milliseconds i thought that i could user a negative value to reset my time, maybe i could calculate the probability or the average of the error.

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