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add method to get the elapsed time between frames #6070

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clankill3r opened this issue Jul 17, 2020 · 2 comments · May be fixed by #6106
Open

add method to get the elapsed time between frames #6070

clankill3r opened this issue Jul 17, 2020 · 2 comments · May be fixed by #6106
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enhancement

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@clankill3r
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I think it would be a great addition to have a deltaTime added to processing so it is more easy to make frame independent movement out of the box.

I know you can do something like:

float speed = 100;
x += speed / frameRate;

But it is more common in computer graphics to make use of a deltaTime.
Here is an example sketch:

float last_frame_time;
float current_frame_time;
float delta_time;


float speed = 100;
float x = 0;

float x2;

void setup() {
  size(600, 600);
  frameRate(999999); // <<< TEST WITH CHANGING THIS!
}

void draw() {

  last_frame_time = current_frame_time;
  current_frame_time = millis();
  delta_time = (current_frame_time - last_frame_time) / 1000;
  
  background(0);
  fill(255,255,0);
  
  x += speed * delta_time;
  ellipse(x, 300, 20, 20);
  
  if (x > width + 10) x = 0;
  
  println(frameRate);
  
  x2 += speed / frameRate;
  ellipse(x2, 350, 20, 20);
  if (x2 > width + 10) x2 = 0;
  
}

Maybe this adds to much to processing, I don't know. But I thought let's open it up for discussion.
@jeremydouglass
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Interesting idea. What might it be called? The current two main sources of time are:

  • millis()
  • frameCount

Your example defines deltaTime by dividing millis by 1000, but I'm assuming that a raw value named deltaMillis() or frameMillis() would be more useful...?

@benfry benfry changed the title add a deltaTime to processing add elapsed time between frames to processing Sep 23, 2020
@benfry benfry changed the title add elapsed time between frames to processing add method to get the elapsed time between frames Sep 23, 2020
@botelho-io
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Working on deltaMillis(), I always wanted a function like this!

@botelho-io botelho-io linked a pull request Oct 9, 2020 that will close this issue
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Resolves #6070, added deltaMillis function botelho-io/processing
4 participants
@clankill3r @jeremydouglass @benfry @botelho-io