Blend Mode 1

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(0);

}

​

function draw() {

  blendMode(BLEND);

  background(0);

  blendMode(SCREEN);

  // ellipse(mouseX, mouseY, 20, 20);

  let redColor = color("#eb3434");

  let blueColor = color("#34b4eb");

  for(let i =0 ; i <width*2 ; i += 100){

    redColor.setAlpha(40);

    fill(redColor);

    ellipse(0,height/2,i+mouseX);

  }

  for(let i =0 ; i <width*2 ; i += 100){

    blueColor.setAlpha(30);

    fill(blueColor);

    ellipse(width,height/2,i+mouseY);

  }

}