Threshold problems

Programming Questions

nnd501

in Programming Questions • 2 years ago

Hi all,

I am stuck on a concept that in my head seems simple, but I just cannot get it to work. I am a bit of a newbie so please bear with me. Please could anybody help or point me in the direction of a tutorial that may help (I have looked). This is a simplified version, for ease of explanation, of what I want to do.

I want a function to trigger when a value goes above a certain threshold. Say an ellipse moving from top to bottom.

The problem I am having is that when this value then goes below the set threshold, the ellipse is removed from the screen.

What I want to happen, is every time the value goes above the threshold, a new instance of the ellipse is created, resulting in multiple ellipses moving down the screen, each one continuing on its own journey after being created.

Many thanks in advance of any possible help.

Replies(2)

PhiLho

Re: Threshold problems

2 years ago

Well, if we assume you write yourself the value in your variable, you know where to add a conditional to check the threshold. If it is set in several locations, you can make a function to set it and do the test at the same time.
To remove an object from the screen, you just stop drawing it. If it is in a list, you can remove it from the list, too (see ArrayList).
You can make a little class to represent the ellipses, or just use a PVector if they have all the same color and size.

nnd501

Re: Threshold problems

2 years ago

Brilliant, thanks a lot. The ArrayList is exactly what I was looking for, enabling me to store a variable number of objects.