Darken the background of my animation with mouse

Hello there
At the end of this work, which interacts with sound and visual, I want to add one more thing: darkening the background color with mouse movement as I pinch the sound effect.
How can I do that?

PImage img;
import processing.sound.*;
Sound s;

void setup() {
  size(600,600, P3D);
  img = loadImage("eye02.jpg");

  SinOsc sin = new SinOsc(this);
  sin.play(150, 0.2);
  sin = new SinOsc(this);
  sin.play(205, 0.2);

  s = new Sound(this);

void draw() {
  float amplitude = map(mouseY, 0, height, 0.4, 0.0);
  float s = mouseX / float(width);
  specular(s, s, s);
    ellipse(mouseX, mouseY,10,10);

  float tiles = mouseX; 
  float tileSize = width/tiles;
  translate(width/2, height/2);
  for (int x = 0; x < tiles; x++){
    for (int y = 0; y < tiles; y++){
      color c = img.get(int(x*tileSize),int(y*tileSize));
      float b = map(brightness(c),0,255,1,0);
      float z = map(b,0,0,-100,100);
      translate(x*tileSize - width/2, y*tileSize - height/2);

Hi, @elifworks Welcome to the forum.
A nice sketch! I want to ask you though if it runs smoothly on your PC. Maybe I really need to buy a graphics card, because I had to set the image to size(250, 250); and use box() instead of sphere() to see at least the rotation of the sketch. To add the effect you want you can draw a black rectangle and change its transparency like:

  fill(0, 255-mouseY);
  rect(0, 0, width, height);

Sketch works fine on my computer, but now it only slows down when I add something new.

I tried your method, but I’m not sure if I put it in the right place. The rectangle rotates with my animation.
I’m working on it, I’ll report the result

@GoToLoop I Just answered a similar question and gave a link to this one and asked if it was a question of the same class. It was confirmed but then the topic disappeared, and when I searched in my visited page history, the message I got was " Oops! That page doesn’t exist or is private.".
Is it possible on this forum to set a page as private?

Yes, but I’m sure you’ll find out to place it in the right place. :smiley:

I opened this account personally, I will use it actively because I will continue the process, not just my homework.
I never found the other account. So thanks for your quick reply :smile:

It perfectly works! :smile: :smile: :smile: