import java.applet.*;
import java.awt.*;
import java.awt.image.*;
import java.*;
import java.lang.*;
import java.util.*;
import java.net.*;

public class ShowTemperature extends Applet {
  Image[] img; 
  Image backimg;
  int[][] pixels;
  int num, index;
  int width, height;
  String stemp, slat, slong;
  int curX, curY;
  FontMetrics fm;
  Font myFont, boldFont;
  PSnav nav;
  double tLow, tHigh;
  int bLow, bHigh;
  EnhancementTable et;

  public void init() {
    slat = " ";
    slong = " ";
    stemp = " ";
    curX = 0;
    curY = 0;
    index = 0;
    String ifn = getParameter("image_filename");

    String scaling = getParameter("scale");
    StringTokenizer st = new StringTokenizer(scaling, ",");
    tLow = Double.valueOf(st.nextToken().trim()).doubleValue();
    tHigh = Double.valueOf(st.nextToken().trim()).doubleValue();
    bLow = Integer.parseInt(st.nextToken().trim());
    bHigh = Integer.parseInt(st.nextToken().trim());
    StringTokenizer ist = new StringTokenizer(ifn,",");
    num = ist.countTokens();
    if (num < 1) num = 1;
    img = new Image[num];
    pixels = new int[num][];

    try {
      String ets = getParameter("et_filename");
      GetImageFile gif = new GetImageFile(this);
     // URL eturl = gif.getFile(ets); 
      URL eturl = new URL(ets);
      et = new EnhancementTable(eturl);

      for (int i=0; i<num; i++) {
        img[i] = gif.getImage(ist.nextToken().trim());
      }
    } catch (Exception ie) {
      ie.printStackTrace();
      return;
    }

    width = img[0].getWidth(this);
    height = img[0].getHeight(this);
    backimg = createImage( width, height);


    for (int i=0; i<num; i++) {
    pixels[i] = new int[width * height];
      PixelGrabber pg = new 
               PixelGrabber(img[i],0,0,width,height,pixels[i],0,width);
      try { pg.grabPixels(); }
      catch (Exception ep) {System.out.println("grabPixels: "+ep);}
      int stat = pg.status();
    }

    boldFont = new Font("sansserif", Font.BOLD, 14);

    // get AREA directory info
    String ai = getParameter("AreaBlock");
    int[] adir = getInts(ai);
    String ni = getParameter("NavBlock");
    int[] ndir = getInts(ni);
    //nav = new LAMBnav(ndir);
    nav = new PSnav(ndir);
    nav.setImageStart(adir[5], adir[6]);
    nav.setRes(adir[11], adir[12]);
    nav.setStart(0,0);
    nav.setMag(1,1);

  }

  public int[] getInts(String s) {
    StringTokenizer st = new StringTokenizer(s,",");
    int n = st.countTokens();
    int[] v = new int[n];
    for (int i=0; i<n; i++) {
      v[i] = Integer.parseInt(st.nextToken().trim());
    }
    return v;
  }

  public void update(Graphics g) {
    paint(g);
  }

  public void paint(Graphics g) {
    Graphics gb = backimg.getGraphics();
    gb.drawImage(img[index],0,0,this);

    gb.setFont(boldFont);
    fm = gb.getFontMetrics();
    int w = fm.stringWidth("Temp = -99.9xC");
    int h = fm.getHeight();

    int xPos = curX+10;
    if ( (curX + 25 + w) > width) {
      xPos = curX - w - 10;
    }

    int yPos = curY;
    if ( (yPos - h) < 5) {
      yPos = h+5;
    } else if ( (yPos + 3*h+5) > height) {
      yPos = height - 3*h - 5;
    }

    drawBold(gb,"Temp = "+stemp,xPos,yPos);
    drawBold(gb,"Lat = "+slat,xPos+4,yPos+h);
    drawBold(gb,"Long = "+slong,xPos+8,yPos+2*h);

    g.drawImage(backimg,0,0,this);
  }

  void drawBold(Graphics g, String s, int x, int y) {
    g.setColor(Color.black);
    g.drawString(s,x-1,y-1);
    g.drawString(s,x+1,y-1);
    g.drawString(s,x-1,y+1);
    g.drawString(s,x+1,y+1);
    g.setColor(Color.white);
    g.drawString(s,x,y);
    return;
  }

  public boolean mouseDown(Event e, int x, int y) {
    index = index + 1;
    if (index >= num) index = 0;
    return mouseMove(e, x, y);
  }

  public boolean mouseMove(Event e, int x, int y) {
    if (x > width-1 || y > height-1) return true;
    if (x < 0 || y < 0 ) return true;

    int value = et.getIndex(pixels[index][x + y*width]);
    //System.out.println("####  value="+value);

    // well-known formulae for converting between brightness and temperature
    if (value < bLow || value > bHigh) {
      stemp = "---";
    } else {
      double temp;
      temp = tHigh - (tHigh - tLow)*(bHigh - value)/(bHigh - bLow);
      int it = (int) Math.round(temp * 10 - 2731.6);
      stemp = new String( (it / 10) +"."+ (Math.abs(it) % 10) + "\u00b0"+"C");
    }

    double[][] lineele = new double[2][1];
    lineele[0][0] = (double)x;
    lineele[1][0] = (double)y;
    double[][] latlon = nav.toLatLon(lineele);
    int ll = (int) Math.round(Math.abs(latlon[0][0]) * 100.);
    String ns = "N";
    if (latlon[0][0] < 0.0) ns ="S";

    int lo = (int) Math.round(Math.abs(latlon[1][0]) * 100.);
    String ew = "E";
    if (latlon[1][0] < 0.0) ew ="W";
    slat = new String((ll/100)+"."+(ll%100)+ns);
    slong = new String((lo/100)+"."+(lo%100)+ew);

    //System.out.println("####  lineele[0][0] = "+lineele[0][0]+ "  lineele[1][0] = "+lineele[1][0]+" slat/slong = "+slat+" "+slong);

    curX = x;
    curY = y;
    repaint();
    return true;
  }

  // return String to two decimal places for value v
  String c2s(double v) {
    String s = v+".000";
    int i = s.indexOf(".");
    return (s.substring(0,i+3));
  }
}