TopoDroidUtil.java

/** @file TopoDroidUtil.java
 *
 * @author marco corvi
 * @date jan 2014
 *
 * @grief numerical utilities
 * --------------------------------------------------------
 *  Copyright This sowftare is distributed under GPL-3.0 or later
 *  See the file COPYING.
 * --------------------------------------------------------
 */
package com.topodroid.DistoX;

import java.lang.Math;

import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.Calendar;
import java.util.GregorianCalendar;

import android.util.Log;

public class TopoDroidUtil
{
  // static final float M_PI  = 3.1415926536f; // Math.PI;
  // static final float M_2PI = 6.283185307f;  // 2*Math.PI;
  // static final float M_PI2 = M_PI/2;        // Math.PI/2
  // static final float M_PI4 = M_PI/4;        // Math.PI/4
  // static final float M_PI8 = M_PI/8;        // Math.PI/8
  // static final float RAD2GRAD = (180.0f/M_PI);
  // static final float GRAD2RAD = (M_PI/180.0f);

  static final long ZERO = 32768;
  static final long NEG  = 65536;
  static final float FV = 24000.0f;
  static final float FM = 16384.0f;
  static final float FN = 2796f; // 2^26 / FV

  static final float DEG2GRAD = 400.0f/360.0f;
  static final float GRAD2DEG = 360.0f/400.0f;

  static final float M2FT = 3.28084f; // meters to feet 
  static final float FT2M = 0.3048f;
  static final float IN2M = 0.0254f;
  static final float YD2M = 0.9144f;

  // static float in360( float f )
  // {
  //   while ( f >= 360 ) f -= 360;
  //   while ( f < 0 )    f += 360;
  //   return f;
  // }

  // static float abs( float x ) { return (float)( Math.abs(x) ); }
  // static float atan2( float y, float x ) { return (float)( Math.atan2( y, x ) ); }
  // static float acos( float x ) { return (float)( Math.acos( x ) ); }

  // static float around( float f, float f0 ) 
  // {
  //   if ( f - f0 > 180 ) return f - 360;
  //   if ( f0 - f > 180 ) return f + 360;
  //   return f;
  // }

  // static float degree2slope( float deg ) { return (float)(100 * Math.tan( deg * GRAD2RAD ) ); }

  // static float slope2degree( float slp ) { return (float)( Math.atan( slp/100 ) * RAD2GRAD ); }


  static String noSpaces( String s )
  {
    return ( s == null )? null 
      : s.trim().replaceAll("\\s+", "_").replaceAll("/", "-").replaceAll("\\*", "+").replaceAll("\\\\", "");
  }

  static String dropSpaces( String s )
  {
    return ( s == null )? null 
      : s.trim().replaceAll("\\s+", "");
  }

  static String currentDate()
  {
    SimpleDateFormat sdf = new SimpleDateFormat( "yyyy.MM.dd", Locale.US );
    return sdf.format( new Date() );
  }

  static String getDateString( String format )
  {
    SimpleDateFormat sdf = new SimpleDateFormat( format, Locale.US );
    return sdf.format( new Date() );
  }

  static float getDatePlg( )
  {
    Calendar c = new GregorianCalendar();
    int y = c.get( Calendar.YEAR );
    int m = 1 + c.get( Calendar.MONTH );
    int d = c.get( Calendar.DAY_OF_MONTH );
    return getDatePlg( y, m, d );
  }

  static int mDaysByMonth[] = { 0, 31, 59, 90, 120, 151, 181,  212, 243, 273, 284, 294, 324 };
  // m: 1 .. 12
  static float getDatePlg( int y, int m, int d )
  {
    int days = 100 * 365 + 24;
    while ( y > 2000 ) {
      days += 365;
      if ( (y % 4) == 0 ) ++ days;
      -- y;
    }
    days += mDaysByMonth[ m ] + d;
    return days;
  }


  static int dateParseYear( String date )
  {
    try {
      return Integer.parseInt( date.substring(0, 4) );
    } catch ( NumberFormatException e ) { }
    return 2000;
  }

  static int dateParseMonth( String date )
  {
    int ret = 0;
    if ( date.charAt(5) == '1' ) ret += 10;
    char ch = date.charAt(6);
    if ( ch >= '0' && ch <= '9' ) ret += (ch - '0');
    return (ret > 0)? ret-1 : 0;
  }

  static int dateParseDay( String date )
  {
    int ret = 0;
    char ch = date.charAt(8);
    if ( ch >= '1' && ch <= '3' ) ret += 10*(ch - '0');
    ch = date.charAt(9);
    if ( ch >= '1' && ch <= '9' ) ret += (ch - '0');
    return (ret > 0)? ret : 0;
  }

  static String composeDate( int y, int m, int d )
  {
    return String.format(Locale.US, "%04d.%02d.%02d", y, m+1, d );
  }

  static int year()  { return (new GregorianCalendar()).get( Calendar.YEAR ); }
  static int month() { return (new GregorianCalendar()).get( Calendar.MONTH ); }
  static int day()   { return (new GregorianCalendar()).get( Calendar.DAY_OF_MONTH); }

}