/** 
  * Bandscope Receiver Applet 1.0.0 [SPECIAL FORMATS CONVERTER]
  * @author Robert J Morton <robmorton@clara.net>
  * @version 13 March 2002, 20 March 2012
  * @copyright Robert J Morton (all rights reserved) */

import java.awt.*;  // for graphics operations (GUI)

class convert {

  // DRAW A STRING CENTRED AT A HORIZONTAL POSITION x
  static void centreString(Graphics g, String s, int x, int y) {
    // dimensions of characters for current font
    FontMetrics fm = g.getFontMetrics();
    // half the width of the string to be displayed
    int b = (fm.stringWidth(s)) >> 1; 
    g.drawString(s, x - b,y);  // display the string
  }


  // DRAW A RIGHT-JUSTIFIED STRING
  static void rightString(Graphics g, String s, int x, int y) {
    // dimensions of characters for current font
    FontMetrics fm = g.getFontMetrics();
    g.drawString(s, x - fm.stringWidth(s),y);  // display the string
  }


  // INTEGRAL HALF-kHz to DECIMAL MHz STRING
  static String toMHz(
    int x,  // frequency in integral half-kHz
    int d   // number of decimal places of MHz required
  ) {
    int D[] = {5,3,2,1,0};     // to convert decimal places to string chop
    String s = "0";
    if((x & 0x1) > 0)          // if there is an odd half-kHz
      s = "5";                 // set 4th decimal place of MHz to '5'
    s = "" + (x >> 1) + s;     // string of rF in form GL.XXXX MHz
    int l = s.length();        // insert the decimal point
    if(l < 5) return "?????";  // safety net
    x = l - 4;                 // to give MHz to 4 decimal places

    // insert the decimal point
    s = s.substring(0,x) + "." + s.substring(x,l);
    // chop to required number of decimal places
    return s.substring(0,s.length() - D[d]);
  }

}