Simple Particle

Particle floater;

float hitDistance = 50;

​

void setup() {

  size( 600, 800);

  floater = new Particle(width/2, height/2);

  floater.gravity = new PVector(0, -.1);

  floater.fillColor = color(#3DCB33);

}

​

void draw() {

  background(0);

  floater.update();

  floater.display();

  //draw hitbox around the particle

  noFill();

  stroke(255, 0, 0);

  ellipse(floater.pos.x, floater.pos.y, hitDistance, hitDistance);

}

​

void mousePressed() {

  if ( dist(mouseX, mouseY, floater.pos.x, floater.pos.y) < hitDistance) {

    floater.addForce( 0, 10 );

  }

}