Particles 1

​

// Particle is the type, pickles is the name of the array

// that contains them. Surreal naming thanks to Marie/Kirsty :) 

Particle[] pickles = new Particle[100];  

​

void setup() { 

  size(400, 400); 

  smooth(); 

  noStroke(); 

  // create a particle object at every index in the array

  for(int i=0; i<pickles.length; i++) { 

     pickles[i] = new Particle(); 

  }

}

​

void draw() { 

  // clear the background

  background(0); 

  // update and draw all the particles

  for (int i=0; i<pickles.length; i++) { 

    pickles[i].update();

  }

}

​

class Particle {

​

  // position properties for our particle

  float x; 

  float y; 

​

  // velocity is the change in position every frame.

  float velX;

  float velY; 

  float drag; 

  // constructor : this is a special function that is 

  // called whenever a Particle is instantiated. 

  Particle() {

​

    // set the x and y position to be in the middle of the

    // screen. 

    x = width/2; 

    y = height/2;

​

    // set the velocity to be a random number 

    // in both x and y directions. 

    velX = random(-10, 10); 

    velY = random(-10, 10);

    drag = 0.96; 

  }

​

  void update() { 

​

    // apply drag to our velocity

    velX*=drag; 

    velY*=drag; 

    // add the velocity to the position

    x+=velX;

    y+=velY;  

    // set the fill colour and draw the particle

    fill(255); 

    ellipse(x, y, 10, 10);

  }

}