class Ball {
  //----------------------------
  // variables
  int ballRadius = 40;
  int eyeOffsetX = ballRadius/3;
  int eyeOffsetY = ballRadius/2;
  int eyeSize = ballRadius/2;
  int pupilSize = ballRadius/4;
  
  int centerX;
  int centerY;

  //----------------------------
  void move(int _centerX, int _centerY) {
    centerX = _centerX;
    centerY = _centerY;
  }
 
  //----------------------------
  void draw() {} 
  
  //----------------------------
  void drawLeftEye(int _targetX, int _targetY) {
    float angle = atan2(_targetY - (centerY - eyeOffsetY), _targetX - (centerX - eyeOffsetX));
    pushMatrix();
      translate(centerX - eyeOffsetX, centerY - eyeOffsetY);
      fill(255);
      ellipse(0, 0, eyeSize, eyeSize);
      rotate(angle);
      fill(0);
      ellipse(pupilSize/2, 0, pupilSize, pupilSize);
    popMatrix();  
  }
  
  //----------------------------
  void drawRightEye(int _targetX, int _targetY) {
    float angle = atan2(_targetY - (centerY - eyeOffsetY), _targetX - (centerX + eyeOffsetX));
    pushMatrix();
      translate(centerX + eyeOffsetX, centerY - eyeOffsetY);
      fill(255);
      ellipse(0, 0, eyeSize, eyeSize);
      rotate(angle);
      fill(0);
      ellipse(pupilSize/2, 0, pupilSize, pupilSize);
    popMatrix();  
  }
}