cball.java

一个3D的保龄球的源代码

/**
 * <p>Title: class CBall</p>
 * <p>Description: Includes properties of bowling ball and controls the ball’s movement.</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: Gameloft ShangHai</p>
 * @author Tao Qing, Wei XIA
 * @version 1.0
 */


class CBall {

//state of ball
  public static final byte BALL_INVALID = 0x00;
  public static final byte BALL_ONLANE = 0x01;
  public static final byte BALL_OUTSIDE = 0x02; //OUTSIDE

//Types of Ball
  /** linear ball */
  public static final int LINEAR_BALL = 0x00;
  /** saucer ball */
  public static final int SAUCER_BALL = 0x01;
  /** curve ball */
  public static final int CURVE_BALL = 0x03;

//Properties of CBall
  public int m_radius;
  public int m_weight;
  public int m_rotationSpeed; //Milo

//the current position when ball is moving
  /*  private int m_currentBallPositionX;
    private int m_currentBallPositionY;
    private int m_currentBallPositionZ;*/
  public int[] m_currentBallPosition = new int[3];

//the Velocity of ball
  public int m_ballVelocityX;
  public int m_ballVelocityY;

//the velocity of ball in gutter
  public int m_ballGutterVelocity;

//acceleration
  /** ball acceleration on x coordinate on light oil area*/
  public int m_ballLAccelerationX;

  /** ball acceleration on y coordinate on light oil area */
  public int m_ballLAccelerationY;

  /** ball acceleration on x coordinate on unoil area */
  public int m_ballUAccelerationX;

  /** ball acceleration on y coordinate on unoil area */
  public int m_ballUAccelerationY;
//state of ball
  public byte m_ballState = BALL_INVALID;

///** ball curve type: linear, saucer or curve */
  public int m_ballCurveType;

  /** ball spin direction: clockwise or anti-clockwise */
  public int m_ballRotationDirection;

  /** ball rolling degree */
  public int m_ballRollingDegree;

  /** ball rolling degree */
  public int[] m_ballRollingArray = {0,0,0};

  /**
   * Constructor of Ball Class
   */
  public CBall() {
    m_radius = 0;
    m_weight = 0;
    m_rotationSpeed = 0;
  }

  public CBall(int radius, int weight) {
    m_radius = radius;
    m_weight = weight;
    m_rotationSpeed = 0;
  }


  /**
   * DEBUG: calculate & set the Rotation Speed of the Ball
   */
  public void computeRotationSpeed(int rotationPowerLevel) {
    //accrding to player’s rotation power level, compared to the properties of Ball Class,
    //calculate the rotation speed of the ball  //Milo
    m_rotationSpeed = rotationPowerLevel;
  }
// ************************************************************
  /**
   * Get the ball status info. <p>
   * BallSpinDirection depends on No.14th, 15th bits of ballStatus<p>
   * BallType depends on No.12th,13th bits of ballStatusInfo<p>
   * BallStartAngle depends on No. 4-11th bits<p>
   * And ballRollingDegree depends on No. 0-3th bits.
   * If ballSpinDirection == 0 means clockwise, otherwise anti-clockwise.
   *
   * @param ballStatusInfo Status word of ball
   */
  public void setBallType(int ballStatusInfo) {
    // get the ball type value
    m_ballCurveType = (ballStatusInfo & 0x000000c0) >> 6;
    // get the ball spin direction
    m_ballRotationDirection = (ballStatusInfo & 0x00000020) >> 5;
    // get the ball rolling degree
    m_ballRollingDegree = (ballStatusInfo & 0x0000001f);

    switch (m_ballCurveType) {
      case LINEAR_BALL:
      case SAUCER_BALL: {
        m_ballLAccelerationX = 0;
        m_ballLAccelerationY = 0;
        m_ballUAccelerationX = 0;
        m_ballUAccelerationY = 0;
      }
      break;

      case CURVE_BALL: {
        if (m_ballRotationDirection == 0) {
          m_ballLAccelerationX = def.sqrt(m_ballRollingDegree) *
              CScene.LFRICTION_MODULUS;
          m_ballLAccelerationY = 0;

          m_ballUAccelerationX = def.sqrt(m_ballRollingDegree) *
              CScene.UFRICTION_MODULUS;
          m_ballUAccelerationY = 0;
        }
        else {
          m_ballLAccelerationX = - (def.sqrt(m_ballRollingDegree) *
                                    CScene.LFRICTION_MODULUS);
          m_ballLAccelerationY = 0;

          m_ballUAccelerationX = - (def.sqrt(m_ballRollingDegree) *
                                    CScene.UFRICTION_MODULUS);
          m_ballUAccelerationY = 0;
        }
        break;

      }

      default:
        break;
    }
  }


  public boolean isIntoBallOutSide() {
    if (m_ballState == BALL_ONLANE &&
        (m_currentBallPosition[0] < 0 || m_currentBallPosition[0] > def.LANE_WIDTH) &&
        !isIntoBallInvalid()) {
      return true;
    }
    return false;
  }

  public void intoBallOutSide() {
    m_ballState = BALL_OUTSIDE;
    m_ballVelocityX = 0;
    if (m_currentBallPosition[0] < 0) {
      m_currentBallPosition[0] = -def.DEFAULT_BALL_RADIUS; //what's the 13? Milo 09-23
    }
    else {
      m_currentBallPosition[0] = def.LANE_WIDTH + def.DEFAULT_BALL_RADIUS;//what's the 13? Milo 09-23
    }
  }

  public boolean isIntoBallInvalid() {
    if (m_ballState != BALL_INVALID &&
        (m_currentBallPosition[1] < 0 ||
         m_currentBallPosition[1] > def.LANE_LENGTH + def.LANE_WIDTH ||
         (m_ballVelocityX == 0 && m_ballVelocityY == 0))) {
      return true;
    }
    return false;
  }

public void initBall(){

    m_currentBallPosition[0] = 0;
    m_currentBallPosition[1] = 0;
    m_currentBallPosition[2] = 0;

    m_ballRollingArray[0] = 0;
    m_ballRollingArray[1] = 0;
    m_ballRollingArray[2] = 0;

    m_ballVelocityX = 0;
    m_ballVelocityY = 0;
    m_ballGutterVelocity = 0;

    m_ballLAccelerationX = 0;
    m_ballLAccelerationY = 0;
    m_ballUAccelerationX = 0;
    m_ballUAccelerationY = 0;

    m_ballState = BALL_INVALID;
    m_ballCurveType = LINEAR_BALL;
    m_ballRotationDirection = 0;
    m_ballRollingDegree = 0;

}
}