/** 
  * Current Account Balances: Graphical Display Applet
  * @author Robert J Morton UK-YE572246C
  * @version 12 July 2000, 23 April 2012
  * @copyright July 2000 Robert J Morton (all rights reserved) */

//  THE PANEL ON WHICH THE HORIZONTAL MONTH SCALE IS DISPLAYED

import java.awt.*;     // for graphics operations (GUI)
import javax.swing.*;  // swing GUI widgets library


public class mscale extends JPanel {

  // font for month-name lettering
  private Font font = new Font("Sans",Font.BOLD,12);

  private FontMetrics fm;  // dimensions of the above font

  // array to hold the insets of the month-name strings
  private int SW[] = new int[12];

  // true when the currently selected year is a leap year
  private boolean leap = false;

  private static final int   //number of days in each month
    days[] = {31,28,31,30,31,30,31,31,30,31,30,31};

  private static final String   //abbreviated names of the months
    month[] = { 
      "Jan","Feb","Mar","Apr","May","Jun",
      "Jul","Aug","Sep","Oct","Nov","Dec"
    };


  mscale() {   // INSTANCE CONSTRUCTOR
    fm = getFontMetrics(font);   // get the measurements of the font
    for(int i = 0; i < 12; i++)  /* For each of the 12 months

      Inset each month-name by the number of days in the month (one day
      per pixel) minus the string-width of the month name (in pixels) 
      plus 1 to counter possible rounding down all divided by 2 */

      SW[i] = (days[i] - fm.stringWidth(month[i]) + 1) / 2;
  }


  /* Set by selyear: leap = true if a leap 
  year is selected; repaint the month scale. */

  void setLeap(boolean b) { leap = b; repaint(); }


  // Called by graph panel: returns number of days in month 'i'
  int getDays(int i) { return days[i]; }


  public void paint(Graphics g) {
    int w = 0;                // set to first day of the year
    g.setFont(font);          // font for month scale
    g.setColor(Color.black);  // colour for month scale

    for(int i = 0; i < 12; i++) {  // for each month shown
      int d = days[i];             // get number of days in this month
      if(d == 1 && leap) d++;      // add a day if leap year february

      g.drawString(month[i],w + SW[i],20);  // draw month name

      g.drawLine(w,0,w,5);  // month boundary mark
      w += d;               // accumulated number of days
    }
    g.drawLine(w, 0, w, 5);  // final year boundary mark
    g.drawLine(0, 0, w, 0);  // horizontal axis
  }
}