java.lang.Math#round ( )源码实例Demo

private BufferedImage produceRoundedCornerIcon(BufferedImage icon) {
  int imageWidth = icon.getWidth();
  // Ratio of icon size to png image size for roundRect icon is 0.93
  double iconWidth = imageWidth * 0.93;
  // Round iconWidth value to even int for a centered png
  int intIconWidth = ((int)Math.round(iconWidth / 2) * 2);
  Image tmp = icon.getScaledInstance(intIconWidth, intIconWidth, Image.SCALE_SMOOTH);
  int marginWidth = ((imageWidth - intIconWidth) / 2);
  // Corner radius of roundedCornerIcon needs to be 1/12 of width according to Android material guidelines
  float cornerRadius = intIconWidth / 12;
  BufferedImage roundedCornerIcon = new BufferedImage(imageWidth, imageWidth, BufferedImage.TYPE_INT_ARGB);
  Graphics2D g2 = roundedCornerIcon.createGraphics();
  g2.setClip(new RoundRectangle2D.Float(marginWidth, marginWidth, intIconWidth, intIconWidth, cornerRadius, cornerRadius));
  g2.drawImage(tmp, marginWidth, marginWidth, null);
  return roundedCornerIcon;
}
 

void _doStateChangeV1(boolean force) {

    // compile our state value
    short s = _buttonStateV1; // buttons
    s |= (_dPadStateH > 0 ? 1 : 0) << 5; // sign bit
    s |= ((int) (Math.round(Math.min(1.0, Math.abs(_dPadStateH)) * 15.0))) <<
        6; // mag
    s |= (_dPadStateV > 0 ? 1 : 0) << 10; // sign bit
    s |= ((int) (Math.round(Math.min(1.0, Math.abs(_dPadStateV)) * 15.0))) <<
        11; // mag

    // if our compiled state value hasn't changed, don't send.
    // (analog joystick noise can send a bunch of redundant states through here)
    // The exception is if forced is true, which is the case with packets that
    // double as keepalives.
    if ((s == _lastSentState) && (!force)) {
      return;
    }

    _stateBirthTimes[_nextState] = SystemClock.uptimeMillis();
    _stateLastSentTimes[_nextState] = 0;

    if (debug) {
      Log.v(TAG, "STORING NEXT STATE: " + _nextState);
    }
    _statesV1[_nextState] = s;
    _nextState = (_nextState + 1) % 256;
    _lastSentState = s;

    // if we're pretty up to date as far as state acks, lets go ahead
    // and send out this state immediately..
    // (keeps us nice and responsive on low latency networks)
    int unackedCount = (_nextState - _requestedState) & 0xFF; // upcast to
    // get
    // unsigned
    if (unackedCount < 3) {
      _shipUnAckedStatesV1();
    }
  }
 

private BufferedImage produceRoundIcon(BufferedImage icon) {
  int imageWidth = icon.getWidth();
  // Ratio of icon size to png image size for round icon is 0.80
  double iconWidth = imageWidth * 0.80;
  // Round iconWidth value to even int for a centered png
  int intIconWidth = ((int)Math.round(iconWidth / 2) * 2);
  Image tmp = icon.getScaledInstance(intIconWidth, intIconWidth, Image.SCALE_SMOOTH);
  int marginWidth = ((imageWidth - intIconWidth) / 2);
  BufferedImage roundIcon = new BufferedImage(imageWidth, imageWidth, BufferedImage.TYPE_INT_ARGB);
  Graphics2D g2 = roundIcon.createGraphics();
  g2.setClip(new Ellipse2D.Float(marginWidth, marginWidth, intIconWidth, intIconWidth));
  g2.drawImage(tmp, marginWidth, marginWidth, null);
  return roundIcon;
}
 

private BufferedImage produceForegroundImageIcon(BufferedImage icon) {
  int imageWidth = icon.getWidth();
  // According to the adaptive icon documentation, both layers are 108x108dp but only the inner
  // 72x72dp appears in the masked viewport, so we shrink down the size of the image accordingly.
  double iconWidth = imageWidth * 72.0 / 108.0;
  // Round iconWidth value to even int for a centered png
  int intIconWidth = ((int)Math.round(iconWidth / 2) * 2);
  Image tmp = icon.getScaledInstance(intIconWidth, intIconWidth, Image.SCALE_SMOOTH);
  int marginWidth = ((imageWidth - intIconWidth) / 2);
  BufferedImage foregroundImageIcon = new BufferedImage(imageWidth, imageWidth, BufferedImage.TYPE_INT_ARGB);
  Graphics2D g2 = foregroundImageIcon.createGraphics();
  g2.drawImage(tmp, marginWidth, marginWidth, null);
  return foregroundImageIcon;
}
 

private int ceil(double v) {
    int valor;

    valor = (int) Math.round(v);
    if ((double) valor < v) {
        valor++;
    }

    return (valor);
}
 

private int ceil(double v) {
    int valor;

    valor = (int) Math.round(v);
    if ((double) valor < v) {
        valor++;
    }

    return (valor);
}
 

private int ceil (double v) {
	int valor;

	valor = (int) Math.round(v);
	if ((double)valor < v) valor++;

	return (valor);
}
 

private int ceil (double v) {
	int valor;

	valor = (int) Math.round(v);
	if ((double)valor < v) valor++;

	return (valor);
}
 

private int ceil (double v) {
	int valor;

	valor = (int) Math.round(v);
	if ((double)valor < v) valor++;

	return (valor);
}
 

private int ceil(double v) {
  int valor;

  valor = (int) Math.round(v);
  if ( (double) valor < v) {
    valor++;
  }

  return (valor);
}
 

public static int convertDpToPixel(Context ctx, int dp) {
    float density = ctx.getResources().getDisplayMetrics().density;
    return Math.round((float) dp * density);
}
 

@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
    selectTimedMetadataTrack(mp);
    mVideoBufferedDuration = (int) Math.round((double) (mVideoDuration * percent) / 100.0);
}
 

/**
 * Rounds a double to the given number of decimal places.
 *
 * @param value the double value
 * @param afterDecimalPoint the number of digits after the decimal point
 * @return the double rounded to the given precision
 */
public static double roundDouble(double value, int afterDecimalPoint) {

    double mask = Math.pow(10.0, (double) afterDecimalPoint);

    return (double) (Math.round(value * mask)) / mask;
}
 

/**
 * Rounds a double to the given number of decimal places.
 *
 * @param value the double value
 * @param afterDecimalPoint the number of digits after the decimal point
 * @return the double rounded to the given precision
 */
public static /*@[email protected]*/ double roundDouble(double value,int afterDecimalPoint) {

  double mask = Math.pow(10.0, (double)afterDecimalPoint);

  return (double)(Math.round(value * mask)) / mask;
}
 

/**
 * Rounds a double to the given number of decimal places.
 *
 * @param value the double value
 * @param afterDecimalPoint the number of digits after the decimal point
 * @return the double rounded to the given precision
 */
public static /*@[email protected]*/ double roundDouble(double value,int afterDecimalPoint) {

  double mask = Math.pow(10.0, (double)afterDecimalPoint);

  return (double)(Math.round(value * mask)) / mask;
}
 

/**
 * Rounds a double to the given number of decimal places.
 *
 * @param value the double value
 * @param afterDecimalPoint the number of digits after the decimal point
 * @return the double rounded to the given precision
 */
public static /*@[email protected]*/ double roundDouble(double value,int afterDecimalPoint) {

  double mask = Math.pow(10.0, (double)afterDecimalPoint);

  return (double)(Math.round(value * mask)) / mask;
}
 

public static MR_int round ( MR_float x ) { return new MR_int((int)Math.round(x.get())); } 

public static MR_long round ( MR_double x ) { return new MR_long(Math.round(x.get())); }