Beispiel #1
0
  @Override
  public void onInit() {
    /* Get time */
    TimeFloat time = new TimeFloat();

    /* Set title */
    setTitle("Simple rotate gears demo, pim 2015");

    /* Create a debug renderer */
    debugRenderer = new DebugRenderer();

    /* Load images */
    bitmapClock = new BitmapImage("data/images/clock.png");
    bitmapSecond = new BitmapImage("data/images/clock_second.png");
    bitmapMinute = new BitmapImage("data/images/clock_minute.png");
    bitmapHour = new BitmapImage("data/images/clock_hour.png");

    /* Create the frame, the motors will be attached to it */
    PhysicsStaticBox frame = new PhysicsStaticBox("frame", CLOCK_CENTER, 10, 10);

    /* Create the hands, at the current system time */
    hand_second = new PhysicsBox("seconds", CLOCK_CENTER, 10, 50, time.getSecondAngle());
    hand_minute = new PhysicsBox("minutes", CLOCK_CENTER, 10, 40, time.getMinuteAngle());
    hand_hour = new PhysicsBox("hours", CLOCK_CENTER, 10, 30, time.getHourAngle());

    /* Prevent collision between hands */
    hand_second.setCollisionGroup(-2);
    hand_minute.setCollisionGroup(-2);
    hand_hour.setCollisionGroup(-2);

    /* Create the motors */
    motor_seconds =
        new PhysicsMotor(frame.getBody(), hand_second.getBody(), frame.getBody().getWorldCenter());

    motor_minutes =
        new PhysicsMotor(frame.getBody(), hand_minute.getBody(), frame.getBody().getWorldCenter());

    /*
     * This motor will only be used as a skeleton for the gear.
     */
    PhysicsMotor motor_m2h =
        new PhysicsMotor(frame.getBody(), hand_hour.getBody(), frame.getBody().getWorldCenter());

    /*
     * Create the gear between the minute hand and the hour hand
     */
    GearJointDef gear_m2h = new GearJointDef();

    /* Do the connections */
    gear_m2h.bodyA = hand_minute.getBody();
    gear_m2h.bodyB = hand_hour.getBody();
    gear_m2h.joint1 = motor_minutes.getJoint();
    gear_m2h.joint2 = motor_m2h.getJoint();

    /*
     * Negative ratio because the minute and hour hand rotates the same
     * direction
     */
    gear_m2h.ratio = -60;
    world.createJoint(gear_m2h);

    /*
     * Start the clock, the second hand is running and the minute hand is
     * stopped
     */
    motor_seconds.initializeMotor(MOTOR_SPEED_SECOND, 1.0f, true);
    motor_minutes.initializeMotor(0.0f, 1.0f, true);

    System.out.println("click to switch debug/rendering mode");
  }
Beispiel #2
0
  @Override
  public void onGraphicRender(GdxGraphics g) {

    /* Update the world physics */
    PhysicsWorld.updatePhysics();

    /* Sync signal emulation using system time */
    boolean sync_signal = new TimeFloat().second % 60.0 == 0.0;

    /*
     * Second hand logic
     *
     * Stop when vertical, start when sync_sygnal
     */
    if (sync_signal) {
      motor_seconds.setMotorSpeed(MOTOR_SPEED_SECOND);
    } else {
      double angle = -hand_second.getBody().getAngle() % (2 * Math.PI);

      if (angle > 2 * Math.PI * 0.995 && motor_seconds.getSpeed() != 0.0) {
        motor_seconds.setMotorSpeed(0.0f);
      }
    }

    /*
     * Minute hand logic
     *
     * Move from 1 minute when sync_signal
     */
    if (sync_signal) {
      motor_minutes.setMotorSpeed(MOTOR_SPEED_MINUTE);
    } else {
      motor_minutes.setMotorSpeed(0.0f);
    }

    /* Get the size of the window */
    final int w = getWindowWidth();
    final int h = getWindowHeight();

    /* Clear the graphic to draw the new image */
    g.clear();

    if (debug_rendering) {
      debugRenderer.render(world, g.getCamera().combined);
      g.setColor(Color.WHITE);
    } else {
      /* Create a nice grey gradient for the background */
      for (int i = 0; i <= h; i++) {
        float c = 255 - i * 0.3f;
        g.setColor(new Color(c / 255, c / 255, c / 255, 1.0f));
        g.drawLine(0, h - i, w, h - i);
      }

      /* Draw the clock frame */
      g.drawPicture(CLOCK_CENTER.x, CLOCK_CENTER.y, bitmapClock);

      /* Draw the hands */
      g.drawTransformedPicture(
          CLOCK_CENTER.x,
          CLOCK_CENTER.y,
          (float) (Math.toDegrees(hand_hour.getBody().getAngle())),
          1.0f,
          bitmapHour);

      g.drawTransformedPicture(
          CLOCK_CENTER.x,
          CLOCK_CENTER.y,
          (float) (Math.toDegrees(hand_minute.getBody().getAngle())),
          1.0f,
          bitmapMinute);

      g.drawTransformedPicture(
          CLOCK_CENTER.x,
          CLOCK_CENTER.y,
          (float) (Math.toDegrees(hand_second.getBody().getAngle())),
          1.0f,
          bitmapSecond);
      g.setColor(Color.BLACK);
    }

    /* Display time in text */
    g.drawString(w - 200, h - 10, "Famous clock from\r\n" + "the Swiss Railways.");

    g.drawString(w - 200, h - 80, displayTime());

    g.drawSchoolLogo();
  }