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Using the thread method.

in Core Library Questions  •  2 years ago  
I noticed that in the 0198 revision there is a new thread function added?


+ Addded thread() method that takes a function name as a parameter, 
  and runs it on its own thread. No more classes!


This looks really useful. do i just call thread(myFunction()) and thats that?

:o. can someone give an example of this :P?

Replies(14)

allesblinkt
allesblin..

Re: Using the thread method.

2 years ago
Try it like described. Basically you just supply the name of the function as a String. The thread automatically disappers when your function has finished. So you have to loop inside that function. The example below would change the color of the ellipse ten times with an interval of roughly one second... 


              
Copy code
    
               
  1. color ellipseColor = color(0, 0, 0);
    2. 
               

    3. 
               
  3. void setup() {
    4. 
               
  4.   size(500, 500);
    5. 
               

    6. 
               
  6.   thread("rainbow");
    7. 
               
  7. }
    8. 
               

    9. 
               

    10. 
               
  10. void draw() {
    11. 
               
  11.   fill( ellipseColor );
    12. 
               
  12.   ellipseMode(CENTER);
    13. 
               
  13.   ellipse(mouseX, mouseY, 10, 10);
    14. 
               
  14. }
    15. 
               

    16. 
               

    17. 
               
  17. void rainbow() {
    18. 
               
  18.   for (int i = 0; i < 10; i++) {
    19. 
               
  19.     ellipseColor = color(random(0,255), random(0,255), random(0,255));
    20. 
               

    21. 
               
  21.     try {
    22. 
               
  22.       Thread.sleep(1000); // delay does not work here
    23. 
               
  23.     } catch (Exception e) {
    24. 
               
  24.     };
    25. 
               
  25.   }
    26. 
               
  26. }
    27. 
               

    28.
PhiLho
PhiLho

Re: Using the thread method.

2 years ago
Where did you see a 0198 revision? It isn't listed in the download page. Is that an Android only release?
jaboston.com
jaboston...

Re: Using the thread method.

2 years ago
PhiLho
PhiLho

Re: Using the thread method.

2 years ago
Ah, there is even a 0199 version! We are close of the 2.0...
martiinko
martiinko

Re: Using the thread method.

2 years ago
It works, but how to stop it from outside?
PhiLho
PhiLho

Re: Using the thread method.

2 years ago
In general, you don't stop a thread from outside, you send a signal (or just set a variable) notifying the thread to stop itself (it just returns).
martiinko
martiinko

Re: Re: Using the thread method.

2 years ago
It could be done with global var.

Copy code
  1. boolean running;
  2. int b = 0;

  4. void setup(){
  5.   thread("addInt");
  6. }

  8. void addInt(){
      running = true;
      while(running){
        b++;
      }
    }

  10. void keyPressed(){
  11.   running = false;
  12. }
Its definitely better then using the class SomeName extends Thread :)
David Wilson
David Wil..

Re: Using the thread method.

2 years ago
Has anyone successfully made the thread sleep? I don't seem to be able to get it to work?

D.


PhiLho
PhiLho

Re: Using the thread method.

2 years ago
What have you tried? What do you want to do?
David Wilson
David Wil..

Re: Re: Using the thread method.

2 years ago
Basically, this didn't seem to work for me:

Thread.sleep(1000); // delay does not work here

Cheers

Dave

Processing user on Google Plus? http://gplus.to/calx
PhiLho
PhiLho

Re: Using the thread method.

2 years ago
Inside the thread itself? How do you check that? Can you show a simple code demonstrating it?
David Wilson
David Wil..

Re: Re: Using the thread method.

2 years ago
Just the code above:

Copy code
  1. color ellipseColor = color(0, 0, 0);

  3. void setup() {
  4.   size(500, 500);

  6.   thread("rainbow");
  7. }


  10. void draw() {
  11.   fill( ellipseColor );
  12.   ellipseMode(CENTER);
  13.   ellipse(mouseX, mouseY, 10, 10);
  14. }


  17. void rainbow() {
  18.   for (int i = 0; i < 10; i++) {
  19.     ellipseColor = color(random(0,255), random(0,255), random(0,255));

  21.     try {
  22.       Thread.sleep(1000); // delay does not work here
  23.     } catch (Exception e) {
  24.     };
  25.   }
  26. }
quarks
quarks

Re: Using the thread method.

2 years ago
Your program is OK.

The delay is in fact working in that it changes the colour every second for the first 10 seconds. The sleep command will not affect the main loop with the draw command.

The thread will execute for the number of iterations (10) x sleep interval (1000 ms) i.e. 10 seconds after that time the colour does not change.

You can see this if you modify the program slightly to this the time is printed out every 1000 milli seconds.

Copy code
  1. color ellipseColor = color(0, 0, 0);

  3. long time;

  5. void setup() {
  6.   size(500, 500);
  7.   thread("rainbow");
  8. }

  10. void draw() {
  11.   fill( ellipseColor );
  12.   ellipseMode(CENTER);
  13.   ellipse(mouseX, mouseY, 10, 10);
  14.   println(time);
  15. }

  17. void rainbow() {
  18.   for (int i = 0; i < 10; i++) {
  19.     ellipseColor = color(random(0,255), random(0,255), random(0,255));
  20.     time = millis();
  21.     try {
  22.       Thread.sleep(2000); // delay does not work here
  23.     } catch (Exception e) {
  24.       e.printStackTrace();
  25.     };
  26.   }
  27. }


David Wilson
David Wil..

Re: Re: Using the thread method.

2 years ago
Thankyou, this is exactly what I wanted to know.

D.

Processing user on Google Plus? http://gplus.to/calx
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