/** 
  * Bandscope Receiver Applet 1.0.0 [SPECIAL FORMATS CONVERTER]
  * @author Robert J Morton <robmorton@clara.net> YE572246C
  * @version 13 March 2002, 20 March 2012
  * @copyright Robert J Morton (all rights reserved) */

import java.awt.*;   //f or 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) {

    // Get the dimensions of characters for the current font
    FontMetrics fm = g.getFontMetrics();

    // Compute half 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) {

    // Get the dimensions of the characters for the 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;

    /* If there's an odd half-kHz, set 4th decimal place of MHz to '5' else
    if it's a whole number of kHz, set 4th decimal place of MHz to '0'.*/

    if((x & 0x1) > 0) s = "5"; else s = "0";

    s = "" + (x >> 1) + s;  // string of rF in form GL.XXXX MHz
    int l = s.length();     // insert the decimal point
    x = l - 4;              // to give MHz to 4 decimal places

    //insert the decimal point and chop to required number of decimal places.

    s = s.substring(0, x) + "." + s.substring(x, l);
    return s.substring(0, s.length() - D[d]);
  }
}