Example #1
0
    public void calculateForces(ArrayList objects) {
      for (int i = 0; i < objects.size(); i++) {
        CelestialObject obj = (CelestialObject) objects.get(i);
        ArrayList forces = obj.getForces();
        float totalForceX = 0;
        float totalForceY = 0;

        for (int j = 0; j < forces.size(); j++) {
          totalForceX += ((PVector) forces.get(j)).x;
          totalForceY += ((PVector) forces.get(j)).y;
        }

        PVector newAccel = new PVector(totalForceX / obj.getMass(), totalForceY / obj.getMass());

        obj.setAcceleration(newAccel);
      }

      for (int i = 0; i < objects.size(); i++) {
        CelestialObject obj1 = (CelestialObject) objects.get(i);
        float forceX = 0;
        float forceY = 0;
        obj1.clearForces();

        if (obj1.getClass() == Star.class) {
          println(obj1.getVelocity());
          continue;
        }

        for (int j = 0; j < objects.size(); j++) {
          CelestialObject obj2 = (CelestialObject) objects.get(j);

          if (i == j) continue;

          PVector pvDistance = PVector.sub(obj2.getPosition(), obj1.getPosition());
          //    println("distance: x:" + pvDistance.x + " y:" + pvDistance.y);
          float distance = sqrt(sq(pvDistance.y) + sq(pvDistance.x));
          float angle = degrees(atan2(pvDistance.y, pvDistance.x));

          float force = (G * obj1.getMass() * obj2.getMass()) / sq(distance);
          forceX = force * cos(radians(angle));
          forceY = force * sin(radians(angle));
          //        println("FORCES on " + obj1.getName() + ":" + forceX + "," + forceY);
          obj1.addForce(new PVector(forceX, forceY));

          println();
        }
      }
    }
Example #2
0
 public void drawOrbits(ArrayList alObjectsArchive) {
   //  println("SIZE:" + alObjectsArchive.size());
   //  ArrayList alObjectsArchive = timeline.getObjectStateArchive();
   ArrayList alPrevPos = new ArrayList();
   ArrayList alColors = new ArrayList();
   alColors.add(color(255, 0, 0));
   alColors.add(color(255, 255, 0));
   alColors.add(color(255, 0, 255));
   //  for (int i = timeline.getTimeIdx(); i >= 0 && i > (timeline.getTimeIdx() - 1 - 100); i--)
   for (int i = 0; i < alObjectsArchive.size(); i++) {
     ArrayList objects = (ArrayList) alObjectsArchive.get(i);
     for (int j = 0; j < objects.size(); j++) {
       CelestialObject obj = (CelestialObject) objects.get(j);
       //      CelestialObject obj = (CelestialObject)objects.get(1);
       PVector pos = obj.getPosition();
       //      stroke(0, 0, 255);
       stroke((Integer) alColors.get(j));
       if (alPrevPos.size() == objects.size()) {
         PVector prevPos = (PVector) alPrevPos.get(j);
         line(prevPos.x, prevPos.y, pos.x, pos.y);
         alPrevPos.set(j, pos);
       } else alPrevPos.add(pos);
     }
   }
 }
Example #3
0
  public void mouseDragged() {
    if (paused) {
      ArrayList objects = timeline.getStatefulObjects();
      for (int i = 0; i < objects.size(); i++) {
        CelestialObject obj = (CelestialObject) objects.get(i);
        if (obj.isMouseOver()) {
          dragging = true;
          PVector pos = obj.getPosition();
          pos.x = mouseX;
          pos.y = mouseY;

          timeline.reset();
          timeline.setCurrentState(objects);
          sliderTimeline.setValue(0);
          break;
        }
      }
    }
  }