/** 
  * Current Account Balances: Graphical Display Applet
  * @author Robert J Morton <robmorton@clara.net>
  * @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
  private int SW[] = new int[12];  // array to hold the insets
                                   // of the month-name strings
  private boolean leap = false;    // true when the currently selected
                                   // year is a leap year
  private static final int
    days[] = {31,28,31,30,31,30,31,31,30,31,30,31};

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


  mscale() {  // INSTANCE CONSTRUCTOR
    fm = getFontMetrics(font);   // 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;
  }


  void setLeap(boolean b) {  // set by selyear
    leap = b;   // true if a leap year is selected
    repaint();  // repaint the month scale
  }


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