Particle[] particles = new Particle[5];
float angle;
float friction = 1;
PVector center;

boolean showSphere = true;
boolean drawMode = false;

void setup() {
  size(600, 600, P3D);
  background(0);
  center = new PVector(0,0,0);
  
  for (int i = 0; i < particles.length; i++) {
      particles[i] = new Particle(
      random(-10, 10),
      random(-10, 10),
      random(-10, 10)
      );
      
  }
}

void draw() {
  if (drawMode == false) {
    background(0);
  }
  
//  directionalLight(127, 127, 127, 0, 1, 0);
//  ambientLight(200,200,200);
  
  translate(width/2, height/2, -width/2);
  rotateX(cos(angle)*PI/2);
  rotateY(sin(angle)*PI/2);
  rotateZ(sin(angle)*PI/2);
  
  if (showSphere == true) {
    
    noFill();
    stroke(255,50);
    sphere(400);
  }
  
  for (int i = 0; i < particles.length; i++) {
    particles[i].update();
    particles[i].show();
  }
  
  angle += 0.001;
}

void keyPressed() {
  if (key == 'R' || key == 'r') {
    println("changing the radius!");
    for (int i = 0; i < particles.length; i++) {
      particles[i].radius = random(1, 50);
    }
  }
  
  if (key == 'S' || key == 's') {
    println("hiding/showing sphere");    
    showSphere = !showSphere;
  }
  
  if (key == ' ') {    
    drawMode = !drawMode;
    println("draw mode is currently " + drawMode);
    
    if (drawMode == true) {
      showSphere = false;
    }
  }
  
}