onRotationAnim method

dynamic onRotationAnim(dynamic time, dynamic rotationAxis, dynamic w0)

• Perform animation for rotation operation
  • @param {Number} time Instant in which this function is called as performance.now()
    • @param {Vector3} rotationAxis Rotation axis
    • @param {number} w0 Initial angular velocity

Implementation

onRotationAnim(time, rotationAxis, w0) {
  if (this._timeStart == -1) {
    //animation start
    this._anglePrev = 0;
    this._angleCurrent = 0;
    this._timeStart = time;
  }

  if (this._state == STATE2.ANIMATION_ROTATE) {
    //w = w0 + alpha * t
    var deltaTime = (time - this._timeStart) / 1000;
    var w = w0 + ((-this.dampingFactor) * deltaTime);

    if (w > 0) {
      //tetha = 0.5 * alpha * t^2 + w0 * t + tetha0
      this._angleCurrent =
          0.5 * (-this.dampingFactor) * Math.pow(deltaTime, 2) +
              w0 * deltaTime +
              0;
      this.applyTransformMatrix(
          this.rotate(rotationAxis, this._angleCurrent));
      this.dispatchEvent(_changeEvent);
      var self = this;
      this._animationId = requestAnimationFrame((t) {
        self.onRotationAnim(t, rotationAxis, w0);
      });
    } else {
      this._animationId = -1;
      this._timeStart = -1;

      this.updateTbState(STATE2.IDLE, false);
      this.activateGizmos(false);

      this.dispatchEvent(_changeEvent);
    }
  } else {
    //interrupt animation

    this._animationId = -1;
    this._timeStart = -1;

    if (this._state != STATE2.ROTATE) {
      this.activateGizmos(false);
      this.dispatchEvent(_changeEvent);
    }
  }
}