Check out example codes for "processing pvector". It will help you in understanding the concepts better.

Code Example 1

PVector v1, v2;

void setup() {
  noLoop();
  v1 = new PVector(40, 20);
  v2 = new PVector(25, 50); 
}

void draw() {
  ellipse(v1.x, v1.y, 12, 12);
  ellipse(v2.x, v2.y, 12, 12);
  v2.add(v1);
  ellipse(v2.x, v2.y, 24, 24);
}

Code Example 2

// Instead of a bunch of floats, we now just have two PVector variables.
PVector location;
PVector velocity;

void setup() {
  size(200,200);
  smooth();
  background(255);
  location = new PVector(100,100);
  velocity = new PVector(2.5,5);
}

void draw() {
  noStroke();
  fill(255,10);
  rect(0,0,width,height);
  
  // Add the current speed to the location.
  location.add(velocity);

  // We still sometimes need to refer to the individual components of a PVector 
  // and can do so using the dot syntax (location.x, velocity.y, etc.)
  if ((location.x > width) || (location.x < 0)) {
    velocity.x = velocity.x * -1;
  }
  if ((location.y > height) || (location.y < 0)) {
    velocity.y = velocity.y * -1;
  }

  // Display circle at x location
  stroke(0);
  fill(175);
  ellipse(location.x,location.y,16,16);
}

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