oscP5, can't draw shapes from inside the oscEvent function

[adamstephensun]

I am fairly new to processing but have experience in other languages. I am using the oscP5 library to send coordinates from Unity to processing over osc.

However, I am having an issue with drawing shapes from within the oscEvent function. This snippet is from within the oscEvent function.

    else if(theOscMessage.addrPattern().equals(ballPattern)){
        float oscX = theOscMessage.get(0).floatValue();
        float oscY = theOscMessage.get(1).floatValue();
        
        println("#OSC# Recieved message: "+theOscMessage.addrPattern()+"  x:"+oscX+"  y:"+oscY);
        drawPaintball(oscX,oscY);
    }

When drawPaintball() is called, the data is sent through and processed properly (I can see it is correct in the console and debug menu) but the ellipse is not drawn.

void drawPaintball(float x, float y)
{
  float newX = abs(x) * (width * 2);
  float newY = abs(y) * (height * 2);
 
  println("Paintball on "+newX+" "+newY); 
  ellipse(newX,newY, 40, 40);
}

When I call this function from outside the oscEvent function, it works as is intended. I have also tried calling the ellipse() function within the oscEvent function and hard-coding the values, which also doesn’t draw an ellipse().

I appreciate any help.

[GoToLoop]

@adamstephensun

When I call this function from outside the oscEvent function(), it works as is intended.

Stumped by something simple

Even though Processing enqueues input events in a separate Thread, it dequeues them in the main “Animation” Thread. So it’s safe to “draw” when using Processing’s own input callbacks. Now, if a 3rd-party library deals w/ hardware, its callbacks got a very high chance to happen in a separate Thread. Therefore, it’s highly unsafe to mutate the main canvas under a separate Thread. In order to find out which Thread is executing a method, just place this statement there: println(Thread.currentTh…

[adamstephensun]

Thanks for the reply, this has helped a lot!