/** 
  * 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

public class worldmap extends JPanel {
  private static final String   //S-meter scale
    S[] = {" 0",""," 2",""," 4",""," 6",""," 8","","10","","12"};

  private static final Font   // Fonts for Choice menus and buttons
    font1 = new Font("Serif",Font.BOLD,14),
    font2 = new Font("Serif",Font.PLAIN,12);

  private Image img;  // reference to the applet'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

    // x-coordinates of ...
    X1,  // left side of S-Meter scale graduation mark
    X2,  // right side of S-Meter scale graduation mark
    X3,  // the figures of the S-Meter scale
    X4,  // right side of extended bottom line of S-Meter graduations
    X6,  // S-METER title
    X7,  // span-selector end of left half of arrow
    X8,  // span-selector end of right half of arrow
    X9,  // xleft arrow head
    X0,  // the right arrow head

    /* extremities of frequency graduation 
    marks just below bottom of scope screen ... */ 
    Y1,  // upper 
    Y2,  // lower

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

    // y-coordinate of ...
    Y7,  // top of centre-line just above the centre frequency field
    Y8,  // 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(Image i,int GL,int GB,int GT,int GW,int SX) {
    img = i;
    this.GL = GL; this.GB = GB; this.GT = GT;

    // x-coordinate of the ...
    GR = GL + GW;      // Graph Right (right side of the graph area)
    GC = GL + GW / 2;  // Graph Centre (centre of the graph area)

    // Frequency graduation marks just below bottom of scope screen
    Y1 = GB + 5;   // upper extremity of 
    Y2 = GB + 10;  // lower extremity of

    Y3 = GT - 20;  // y-coordinate of frequency span arrows 
    Y4 = Y3 + 3;   // arrow head indicating frequency span
    Y5 = Y3 - 3;   // arrow head indicating frequency span
    Y6 = GT - 15;  // y-coordinate of S-METER title

    // centre-line just above the centre frequency field
    Y7 = GB + 25;  // y-coordinate of its top 
    Y8 = GB + 40;  // y-coordinate of its bottom

    // x-coordinate of ...
    X1 = SX - 6;   // left side of S-Meter scale graduation mark
    X2 = SX - 12;  // right side of S-Meter scale graduation mark
    X3 = SX - 22;  // the figures of the S-Meter scale
    X4 = SX + 19;  /* right side of the extended bottom 
                   line of the S-Meter graduations. */
    X6 = SX - 4;   // S-METER title
    X7 = GC - 52;  // span-selector end of left half of arrow
    X8 = GC + 51;  // span-selector end of right half of arrow
    X9 = GL + 5;   // left arrow head
    X0 = GR - 5;   // 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 each frequency graduation draw frequency graduation marks
    for(int i = GL; i < I; i += 20) g.drawLine(i, Y1, i, Y2);

    g.drawLine(GL, Y1, GR, Y1);  // horizontal axis (frequency)
    g.drawLine(GC, Y7, GC, Y8);  /* centre-line just above
                                 the 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 each S-unit graduation, draw the S-meter figure and its
    graduation mark, then move up 8 pixels ready for the next one. */

    for(int i = 0; i < SL; i++) {
      convert.centreString(g, S[i], X3, y + dy);
      g.drawLine(X1, y, X2, y);
      y -= 8;
    }

    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
  }
}