/** 
  * HF Receiver Controller Applet 1.0.0
  * @author Robert J Morton YE572246C
  * @version 25 November 2001, 
    revanped 16 November 2007, 
    Swing Version 31 January 2012
  * @copyright Robert J Morton (all rights reserved) */

/* This is the Applet's background image panel */

import javax.swing.*;  // the Swing GUI system
import java.awt.*;     // abstract windiwing toolkit
import java.awt.image.BufferedImage;

public class worldmap extends JPanel {

  private static final long 
    serialVersionUID = 212L;  // what the hell this is for, I don't know!

  private static final String  // S-meter scale
    S[] = {" 0",""," 2",""," 4",""," 6",""," 8","","10","","12"};
  private static final Font 
    font1 = new Font("Serif",Font.BOLD, 14),  // for Choice menus and buttons
    font2 = new Font("Serif",Font.PLAIN,12);  // for Choice menus and buttons

  private BufferedImage img;  // reference to the app's background image
  private Color bg4 = new Color(180,180,180);  // graticule colour

  private int
    GC,  // graph centre
    GR,  // graph right
    GB,  // graph base
    GL,  // graph left
    GT,  // graph top

    SL = S.length,  // length of the S[] String array

    X1,  // x-coordinate of left side of S-Meter scale graduation mark
    X2,  // x-coordinate of right side of S-Meter scale graduation mark
    X3,  // x-coordinate of the figures of the S-Meter scale

    X4,  /* x-coordinate of right side of extended
            bottom line of S-Meter graduations */

    X6,  // x-coordinate of S-METER title
    X7,  // x-coordinate of span-selector end of left half of arrow
    X8,  // x-coordinate of span-selector end of right half of arrow
    X9,  // x-coordinate of left arrow head
    X0,  // x-coordinate of the right arrow head

    Y1,  /* upper extremity of frequency graduation 
            marks just below bottom of scope screen */

    Y2,  /* lower extremity of frequency graduation 
            marks just below bottom of scope screen */

    Y3,  // y-coordinate of frequency span arrows 
    Y4,  // arrow head indication frequency span
    Y5,  // arrow head indication frequency span
    Y6,  // y-coordinate of S-METER title

    Y7,  /* y-coordinate of top of centre-line 
            just above the centre frequency field */

    Y8,  /* y-coordinate of bottom of centre-line 
            just above the centre frequency field */

    I,   // frequency scale graduation loop limit
    dy;  // y-offset of baseline of S-Meter figures from graduation marks


  worldmap(BufferedImage i, int GL, int GB, int GT, int GW, int SX) {
    img = i;
    this.GL = GL;
    this.GB = GB;
    this.GT = GT;
    GR = GL + GW;     /* Graph Right (x-coordinate of the 
                         right side of the graph area) */
    GC = GL + GW / 2; /* Graph Centre (x-coordinate of the
                         centre of the graph area) */

    Y1 = GB + 5;   /* upper extremity of frequency graduation marks
                      just below bottom of scope screen */
    Y2 = GB + 10;  /* lower extremity of frequency graduation marks
                      just below bottom of scope screen */
    Y3 = GT - 20;  // y-coordinate of frequency span arrows 
    Y4 = Y3 + 3;   // arrow head indicatin frequency span
    Y5 = Y3 - 3;   // arrow head indicatin frequency span
    Y6 = GT - 15;  // y-coordinate of S-METER title
    Y7 = GB + 25;  /* y-coordinate of top of centre-line just 
                      above the centre frequency field */
    Y8 = GB + 40;  /* y-coordinate of bottom of centre-line just 
                      above the centre frequency field */
    X1 = SX - 6;   /* x-coordinate of left side of S-Meter 
                      scale graduation mark */
    X2 = SX - 12;  /* x-coordinate of right side of S-Meter
                      scale graduation mark */
    X3 = SX - 22;  // x-coordinate of the figures of the S-Meter scale
    X4 = SX + 19;  /* x-coordinate of right side of extended
                      bottom line of S-Meter graduations */
    X6 = SX - 4;   // x-coordinate of S-METER title
    X7 = GC - 52;  // x-coordinate of span-selector end of left half of arrow
    X8 = GC + 51;  // x-coordinate of span-selector end of right half of arrow
    X9 = GL + 5;   // x-coordinate of left arrow head
    X0 = GR - 5;   // x-coordinate of the right arrow head

    I = GL + 210;  // frequency scale graduation loop limit

    dy = (getFontMetrics(font2).getAscent() >> 1) - 2;
  }


  public void paint(Graphics g) {

    // draw the background image onto the applet canvas
    g.drawImage(img,0,0,this);

    // FREQUENCY SCALE MARKS JUST BELOW BOTTOM OF SCOPE SCREEN
    g.setColor(Color.black);

    for(int i = GL; i < I; i += 20)  // for each frequency graduation
      g.drawLine(i,Y1,i,Y2);         // draw frequency graduation marks

    g.drawLine(GL,Y1,GR,Y1);  // horizontal axis (frequency)
    g.drawLine(GC,Y7,GC,Y8);  // centre-line just above centre frequency field
    g.drawLine(GL,Y3,X7,Y3);  // horizontal left-hand span arrow
    g.drawLine(GL,Y3,X9,Y5);
    g.drawLine(GL,Y3,X9,Y4);
    g.drawLine(X8,Y3,GR,Y3);  // horizontal right-hand span arrow
    g.drawLine(X0,Y5,GR,Y3);
    g.drawLine(X0,Y4,GR,Y3);
    g.setFont(font1);
    convert.centreString(g,"S-Meter",X6,Y6);  // print S-METER title
    int y = GB;
    g.setFont(font2);
    for(int i = 0; i < SL; i++){  // for each S-unit graduation
      convert.centreString(g,S[i],X3,y+dy);  // draw S-meter figure
      g.drawLine(X1,y,X2,y);                 // draw graduation mark
      y -= 8;  // accumulated number of S-meter scale pixels
    }
    g.drawLine(X1,GB,X4,GB);  // draw extended bottom graduation mark 
    g.setColor(bg4);
    g.drawLine(GR,GT,GR,GB);  // border line at the right of the graph
    g.drawLine(GL,GB,GR,GB);  // border line at the right of the graph
  }
}