click on particle - loop over each?

argdev173

Hi! I've a canvas with 400 aprox. elements (objects), each has a boolean state and i want to change that state by clicking on that object, i can achieve it by doing a dist from object x and y to mouse position. But looping over all the objects each time i click is a good choice? i think thats a perfomance flaw, i didnt try yet, but maybe in the future i want 1000 particles. The elements dont move, sorry for the english.

Thanks

TfGuy44

Loop over all the objects when the mouse is pressed and calculate the distances. There should be no noticeable performance issue. Here's a sketch that runs about the same amount of work each click, but for 40000 objects (each pixel).

void setup(){
  size(200,200);
  background(0);
}

void draw(){
}

void mousePressed(){
  run_static();
}

void run_static(){
  for(int x=0; x<width;x++){
    for(int y=0;y<height;y++){
      float d = dist(mouseX,mouseY,x,y);
      stroke(random(d));
      point(x,y);
    }
  }
}

argdev173

Thanks for your help! I'll do that.