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com.hfg xml, html, svg, and bioinformatics utility library
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package com.hfg.math.units;

import com.hfg.util.StringUtil;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

//------------------------------------------------------------------------------
/**
 Interface for unit-independent angle measurement.
 For an example of use, see DmlGradientFill.
 
  @author J. Alex Taylor, hairyfatguy.com
 
 */
//------------------------------------------------------------------------------
// com.hfg XML/HTML Coding Library
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
// [email protected]
//------------------------------------------------------------------------------

public interface Angle
{

   public float to(AngleUnits inUnits);

   public int toInt(AngleUnits inUnits);

   public void scale(float inScalingFactor);

   public static final Pattern MEASUREMENT_PATTERN = Pattern.compile("(\\-?[\\d\\.]+)(\\w+)?");

   //--------------------------------------------------------------------------
   /**
    Function for converting a string representation of an angle into its appropriate object.
    @param inStringValue  the string representation (ex: "10deg", "12rad", or "17.5")
    @param inDefaultUnits  the units to use if the string representation is unit-less.
    @return a Angle-implementing object
    */
   public static Angle allocate(String inStringValue, AngleUnits inDefaultUnits)
   {
      if (! StringUtil.isSet(inStringValue))
      {
         throw new RuntimeException("No String value sent to Angle.allocate()!");
      }

      inStringValue = inStringValue.trim();

      Matcher m = MEASUREMENT_PATTERN.matcher(inStringValue);
      if (! m.matches())
      {
         throw new RuntimeException(StringUtil.singleQuote(inStringValue) + " could not be interpreted by Angle.allocate()!");
      }

      float floatVal = Float.parseFloat(m.group(1));
      Angle angle = null;
      AngleUnits units = AngleUnits.valueOf(m.group(2));
      if (null == units)
      {
         units = inDefaultUnits;
      }

      if (units.equals(AngleUnits.degrees))
      {
         angle = new Degrees(floatVal);
      }
      else if (units.equals(AngleUnits.radians))
      {
         angle = new Radians(floatVal);
      }

      return angle;
   }
}