Пример #1
0
  /**
   * Convert a measure from one units to another. The application units, target units and base size
   * units must be one of the absolute units(CM, IN, MM, PT, PC). The input dimension value must be
   * one of the following types:
   *
   * <ul>
   *   <li><code>String</code>. It must be a legal dimension value, measure part and units part such
   *       as '10 em', '+3.5pt', '10%' or only measure part, such as 10.12, 45, +4.
   *   <li><code>DimensionValue</code>
   *   <li><code>DimensionHandle</code>
   * </ul>
   *
   * @param value the input dimension value to be converted
   * @param appUnits the application units, used as the original units to convert from when units
   *     part of the input value is empty or null.It must be one of the absolute unit(CM, IN, MM,
   *     PT, PC).
   * @param targetUnits the desired units, it must be one of the absolute unit(CM, IN, MM, PT, PC).
   * @param baseSize the base size to convert value with relative units, such as em, ex and %
   * @param baseSizeUnits the units for the base size. It must be one of the absolute units(CM, IN,
   *     MM, PT, PC). By default it is <code>DesignChoiceConstants.UNITS_PT</code>
   * @param dpi int value that represents the pixel per inch
   * @return double value in the target unit.
   */
  public static double convertTo(
      Object value,
      String appUnits,
      String targetUnits,
      double baseSize,
      String baseSizeUnits,
      int dpi) {
    if (value == null) return 0.0;

    double measure = 0.0;
    String fromUnits = ""; // $NON-NLS-1$

    // get the measure and unit from the value

    if (value instanceof String) {
      try {
        DimensionValue parsedValue = DimensionValue.parse((String) value);
        // the value can not be null
        measure = parsedValue.getMeasure();
        fromUnits = parsedValue.getUnits();
      } catch (PropertyValueException e) {
        // TODO: support the font-size choices?
        throw new IllegalArgumentException(
            "Given string is not well-formatted dimension!"); //$NON-NLS-1$
      }
    } else if (value instanceof DimensionValue) {
      DimensionValue parsedValue = (DimensionValue) value;
      measure = parsedValue.getMeasure();
      fromUnits = parsedValue.getUnits();
    } else if (value instanceof DimensionHandle) {
      DimensionHandle dimensionHandle = (DimensionHandle) value;
      measure = dimensionHandle.getMeasure();
      fromUnits = dimensionHandle.getUnits();
      if (StringUtil.isBlank(fromUnits)) fromUnits = dimensionHandle.getDefaultUnit();
    }
    // not supported value format
    else
      throw new IllegalArgumentException(
          "Given dimension value is a not supported format!"); //$NON-NLS-1$

    // if units is null or empty, set it to application unit
    if (StringUtil.isBlank(fromUnits)) fromUnits = appUnits;

    // if baseSizeUnit is empty or null, set it to 'pt'
    if (StringUtil.isBlank(baseSizeUnits)) baseSizeUnits = DesignChoiceConstants.UNITS_PT;

    DimensionValue convertedValue = null;
    // do some prepare for the relative units
    if (DesignChoiceConstants.UNITS_EM.equals(fromUnits)) {
      convertedValue = DimensionUtil.convertTo(measure * baseSize, baseSizeUnits, targetUnits);
    } else if (DesignChoiceConstants.UNITS_EX.equals(fromUnits)) {
      convertedValue = DimensionUtil.convertTo(measure * baseSize / 3, baseSizeUnits, targetUnits);
    } else if (DesignChoiceConstants.UNITS_PERCENTAGE.equals(fromUnits)) {
      convertedValue =
          DimensionUtil.convertTo(measure * baseSize / 100, baseSizeUnits, targetUnits);
    } else if (DesignChoiceConstants.UNITS_PX.equals(fromUnits)) {
      convertedValue = convertTo(measure / dpi, DesignChoiceConstants.UNITS_IN, targetUnits);
    } else convertedValue = convertTo(measure, fromUnits, targetUnits);
    return convertedValue.getMeasure();
  }
Пример #2
0
 /**
  * Return if the given unit is a relative unit or not. The following units defined in <code>
  * DesignChoiceConstants</code> are considered as relative:
  *
  * <ul>
  *   <li>UNITS_EM
  *   <li>UNITS_EX
  *   <li>UNITS_PERCENTAGE
  *   <li>UNITS_PX
  * </ul>
  *
  * @param unit a given unit.
  * @return <code>true</code> if the unit is a relative unit like em, ex, % and px. Return <code>
  *     false</code> if the unit is not a relative unit.( it can be an absolute relative unit like
  *     "mm", or even an unrecognized unit. )
  */
 public static final boolean isRelativeUnit(String unit) {
   return DesignChoiceConstants.UNITS_EM.equalsIgnoreCase(unit)
       || DesignChoiceConstants.UNITS_EX.equalsIgnoreCase(unit)
       || DesignChoiceConstants.UNITS_PERCENTAGE.equalsIgnoreCase(unit)
       || DesignChoiceConstants.UNITS_PX.equalsIgnoreCase(unit);
 }