I've been looking for this in other posts. There are similar issues reported, but the answers I've found do not completely apply to my case (surprisingly, because I think it's kind of basic stuff).

In short, I don't know how to have variables mouseX and mouseY changed according to a transform function within mousePresses (say, translate()). Here's what I would like to achieve:

1. void mousePressed()
2. {
3.       pushMatrix();
4.       translate(width/2,height/2); // want to have coordinates respect to the center of the sketch
5.       println(mouseX + "," + mouseY); // this should return 0,0 when I click on the center of the sketch
6.       popMatrix(); 
7. } 

What am I missing?

thank you in advance