little big bang

/* OpenProcessing Tweak of *@*http://www.openprocessing.org/sketch/932*@* */

/* !do not delete the line above, required for linking your tweak if you upload again */

​

int FPS = 30;

int NUM_PARTICLES = 200;

int w=512;

color backgroundColor;

particle[] Particles = new particle[NUM_PARTICLES];

​

int startDelay=30;

int accelerationFrames=3;

int power=4;

float accelerationMult=1.005;

​

​

void setup(){

  size(w,w, P2D);

  noStroke();

  background(0);

  frameRate(FPS);

  for(int i = 0; i < NUM_PARTICLES; i++)  {    Particles[i] = new particle();}

  fill(255);

​

}

void draw(){//if(frameCount%30==0)println(frameRate);

if(frameCount<startDelay){  ellipse(w/2,w/2,frameCount/2,frameCount/8);ellipse(w/2,w/2,frameCount/8,frameCount/2); return;}

  noStroke();

  fill(0,0,0,150);

  rect(0,0,w,w);

​

     if (mousePressed&&mouseButton==LEFT){ Particles[0].mass=300;Particles[0].position.x=mouseX;Particles[0].position.y=mouseY;Particles[0].velocity.x=0;Particles[0].velocity.y=0;}

     else Particles[0].mass=0;

  for(int i = 1; i < NUM_PARTICLES; i++)  {    Particles[i].update(); }

}

class particle{

  PVector position;

  PVector velocity;

  float mass;

  particle()  {

    position = new PVector();

    velocity = new PVector();

    position.x = w/2;

    position.y = w/2;

    velocity.x = random(-power,power);

    velocity.y = random(-power,power);

    mass = random(1,2);

  }

  void followGravity(PVector location, float mass1, float mass2){

    PVector unitVector = new PVector();

    unitVector = location.get();

    unitVector.sub(position);

    float dist = location.dist(position);

    unitVector.normalize();

    PVector force = new PVector();

    double g = -0.06673;

    g *= ((mass1*mass2)/(dist));

    force.x = (float)(g*(double)unitVector.x);

    force.y = (float)(g*(double)unitVector.y);

//    float magnitude = force.mag();

    velocity.sub(force);

    if(frameCount<startDelay+accelerationFrames){

    velocity.x*=accelerationMult;

    velocity.y*=accelerationMult;

}

  }

  void update()  {

    for(int i = 0; i < NUM_PARTICLES; i++) { if(position.x != Particles[i].position.x || position.y != Particles[i].position.y)

      {  followGravity(Particles[i].position, mass,Particles[i].mass); }

    }

    velocity.mult(0.9);

    position.add(velocity);

    PVector center = new PVector(w/2,w/2);

    if(position.dist(center)>w/2)    {

      PVector normalVec = new PVector();

      normalVec=position.get();

      normalVec.sub(center);

      normalVec.normalize();

      normalVec.mult(10);

      velocity.sub(normalVec);

    }

    render();

  }

   void render()  {

    stroke(255,255,255);

    strokeWeight(mass);

//    pushMatrix();

//    translate(position.x,position.y);

    point(position.x,position.y);

//    rect(0,0,2,2);

//    popMatrix();

  }

}

​

 void keyPressed(){frameCount=0;setup();}  

 void mousePressed(){if(mouseButton==RIGHT){frameCount=0;setup();}}