Visualize Trappist-1

ArrayList<Body> bodies = new ArrayList<Body>();

float zoom = 1;

void setup() {
  size(600, 600);

  bodies.add(new Body(0.38, 0.387, color(180, 180, 180), color(255, 0, 0), "Mercury"));
  bodies.add(new Body(0.95, 0.723, color(220, 220, 180), color(255, 255, 0), "Venus"));
  bodies.add(new Body(1, 1, color(20, 20, 255), color(0, 255, 0), "Earth"));
  bodies.add(new Body(0.53, 1.524, color(255, 100, 0), color(0, 255, 155), "Mars"));
  bodies.add(new Body(10.97, 5.203, color(180, 180, 0), color(0, 0, 255), "Jupiter"));
  bodies.add(new Body(9.14, 9.555, color(200, 200, 0), color(0, 0, 255), "Saturn"));
  bodies.add(new Body(4.01, 19.218, color(220, 220, 255), color(0, 0, 255), "Uranus"));
  bodies.add(new Body(3.86, 30.11, color(0, 0, 230), color(0, 0, 255), "Neptune"));
  bodies.add(new Body(109.2, 0, color(255, 255, 0), color(0, 0, 0), "Sol"));

  bodies.add(new Body(1.09, 0.011, color(230, 180, 0), color(255, 0, 0), "b"));
  bodies.add(new Body(1.06, 0.015, color(180, 180, 0), color(255, 0, 0), "c"));
  bodies.add(new Body(0.77, 0.021, color(180, 180, 0), color(255, 255, 0), "d"));
  bodies.add(new Body(0.92, 0.028, color(150, 140, 200), color(0, 255, 0), "e"));
  bodies.add(new Body(1.04, 0.037, color(150, 140, 200), color(0, 255, 0), "f"));
  bodies.add(new Body(1.13, 0.045, color(220, 255, 220), color(0, 255, 0), "g"));
  bodies.add(new Body(0.76, 0.06, color(220, 220, 180), color(0, 0, 255), "h"));
  bodies.add(new Body(12.449, 0, color(220, 20, 10), color(0, 0, 0), "Trappist-1"));

  textAlign(CENTER);
}


void draw() {
  background(0);
  translate(width/2, height/2);
  for (Body b : bodies) {
    b.show();
  }
  print(zoom + "\n");

  ruler();
}

void ruler() {
  stroke(255);
  line(0, 50, 0, height/2-100);
  text("0 AU", 0, height/2-50);

  line(7.5*.01*zoom, 50, 7.5*.01*zoom, height/2-100);
  text(".01 AU", 7.5*.01*zoom, height/2-50);

  line(7.5*.05*zoom, 50, 7.5*.05*zoom, height/2-100);
  text(".05 AU", 7.5*.05*zoom, height/2-50);

  line(7.5*.1*zoom, 50, 7.5*.1*zoom, height/2-100);
  text(".1 AU", 7.5*.1*zoom, height/2-50);

  line(7.5*.5*zoom, 50, 7.5*.5*zoom, height/2-100);
  text(".5 AU", 7.5*.5*zoom, height/2-50);

  line(7.5*zoom, 50, 7.5*zoom, height/2-100);
  text("1 AU", 7.5*zoom, height/2-50);

  line(7.5*5*zoom, 50, 7.5*5*zoom, height/2-100);
  text("5 AU", 7.5*5*zoom, height/2-50);

  line(7.5*10*zoom, 50, 7.5*10*zoom, height/2-100);
  text("10 AU", 7.5*10*zoom, height/2-50);
}

class Body {

  float r;
  float au;

  color orbit = color(0);
  color c = color(255);

  String name;

  Body(float r_, float au_, color c_, color orbit_, String name_) {
    r = r_ * 6.4 / 1000000/2; //input is in r's (unit of earth's radius). Convert to km (1:2000000000 scale)
    au = au_ * 15/2; //input is in AU's (unit of earth's orbital radius). Convert to km (1:2000000000 scale)
    c = c_; //Sphere Color
    orbit = orbit_; //Orbital Color
    name = name_; //name
  }

  void show() {
    noFill();
    stroke(orbit);
    ellipse(0, 0, 2*au*zoom, 2*au*zoom);
    fill(c);
    stroke(c);
    ellipse(au*zoom, 0, r*zoom, r*zoom);
    stroke(0);
    fill(255);
    text(name, au*zoom+r*zoom/2, 0);
  }
}

void mouseWheel(MouseEvent event) {
  if (event.getCount() > 0) {
    zoom /= 1.05;
  } else {
    zoom *= 1.05;
  }
}