0

Im trying to make a program where you are a ship and you simply avoid comets that fly towards you. I somewhat know how to use array lists to add and subtract objects, but I'm not sure how to get the program to add and subtract objects after a specific time like 5 seconds. My goal is to make each comet spawn 2 seconds apart but I'm not sure how. If anyone can help please let me know!

Carter Moseley
  • 1
  • 1
  • Other than `frameCount` you can also look into [millis()](https://stackoverflow.com/questions/12417937/create-a-simple-countdown-in-processing/12421641#12421641). – George Profenza Oct 07 '18 at 15:55

1 Answers1

0

Processing exposes a useful variable frameCount that you can use for such timing behaviours.

You could use it in combination with the modulo operator % (an operator that returns the remainder after the division of two numbers), as follows:

draw() {
    .
    .
    .
    if (frameCount % t == 0) {
        spawnComet();
    }
    .
    .
    .
}

Assuming frameRate is fixed at 60, t takes the value of 60*(desired time delay in seconds). You want to spawn comets every 2 seconds: 60*2 = 120. Therefore set t to 120 to satisfy the requirement of your example. This means spawnComet() will trigger every 120 frames.

micycle
  • 3,328
  • 14
  • 33