/** 
  * Web Site Hits and TLI Sales Count Graph Generator
  * @author Robert John Morton
  * @version 27 April 2000 */

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

public class tlisales extends JPanel implements Runnable {

  private int 
    X = 42,   // horizontal bias from left edge of applet to start of x-axis
    Y = 150,  // vertical bias from top edge of applet to start of y-axis
    n = 33,   // off-set from start mark of year to start of its name eg 1999
    w,        // weeks counter used on horizontal axis of graph
    weeks[] = {52,52,52,52,52,52,52};

  private boolean
    FTT = true;  // run() first-time-through flag

  private Thread
    T;  // reference for a separate run() thread

  private Color 
    bg1 = new Color(210,210,210),  // main background colour
    bg2 = new Color(210,195,195),  // graph background colour
    bg3 = new Color(180,180,180);  // graticule colour

  private String
    year[] = {"1998","1999","2000","2001","2002","2003","2004"},
    hits[] = {"0","20","40","60","80","100","110"},    //hits scale
    cb;  // code base URL - where this applet's class file came from

  private loader
    ld;  // instance of the data loader


  tlisales(int ls, String cb) {
    bg1 = getBackground();
    setBackground(bg1);    // set the applet's background colour
    ld = new loader(ls,cb);
    T = new Thread(this);  // create a runt() thread
    T.start();
  }


  public void paint(Graphics g) { 
    g.setColor(bg1);
    g.fillRect(0,0,450,180);  // clear the graph panel
    g.setColor(bg2);
    g.fillRect(X,Y-120,364,120);  // clear the graph area
    g.setColor(Color.black);
    w = 0;
    for(int i = 0; i < weeks.length; i++) {  // for each year shown
      g.drawString(year[i],X+13+w,Y+20);     // year number
      g.drawLine(X+w,Y+5,X+w,Y+10);          // year boundary mark
      g.setColor(bg3);
      g.drawLine(X+w,Y,X+w,Y-120);  // annotation mark
      w += weeks[i];                // accumulated number of weeks
      g.setColor(Color.black);
    }
    g.setColor(bg3);
    g.drawLine(X+w,Y,X+w,Y-120);   // annotation mark
    g.setColor(Color.black);
    g.drawLine(X+w,Y+5,X+w,Y+10);  // final year boundary mark
    g.drawLine(X,Y+5,X+w,Y+5);     // horizontal axis

    int z = 0;
    for(int i = 0; i < hits.length; i++) {  // for each 10-hit graduation
      rightString(g,hits[i],X-10,Y+5-z);    // annotation
      g.drawLine(X-10,Y-z,X-5,Y-z);         // annotation mark
      g.setColor(bg3);
      g.drawLine(X,Y-z,X+w,Y-z);            // annotation mark
      z += 20;                              // accumulated number of hits
      g.setColor(Color.black);
    }
    g.drawLine(X-5,Y,X-5,Y-120);            // vertical axis
    g.drawString("Hits per week:",X-n,Y-130);
    g.drawString("Year:",X-n,Y+20);

    if(!ld.dataLoaded())
      return;

    g.setColor(Color.blue);  // set trace colour to blue

    int h = 0;  // number of hits for a given week
    w = X;      // initial x-bias for week number
    int W = 0,  // number of weeks for which there is valid data
        H = 0;  // hits total accumulator

    for(int i = 0; i < ld.L; i++) {

      // avoid displaying zero values before start date
      if((h = (int)ld.B[i]) > 0) {

        // display it as a vertical bar on chart
        g.drawLine(w,Y,w,Y-h);

        H += h;  // add this week's hits to the total
        W++;     // increment number of weeks for which there is valid data
      }
      w++;  // increment the week number
    }
    g.setColor(Color.black);
    g.drawString("Total to Date "+H,105,20);
    if(W > 0)
      g.drawString("Weekly Average "+(H/W),225,20);
  }


  // MANAGE INTERNET DATA TRANSFERS ON A SEPARATE THREAD
  public void run() {
    while(T != null) {  // while this thread exists
      if(ld.dataLoaded() && FTT) {  // if hits data all loaded
        repaint();  // display the graph
        FTT = false;
      }
      try{Thread.sleep(250);}  // sleep then continue loading
      catch(InterruptedException e){}
    }
  }


  // DRAW A RIGHT-JUSTIFIED STRING
  void rightString(Graphics g, String s, int x, int y) {
    // dimensions of characters for current font
    FontMetrics fm = g.getFontMetrics();
    g.drawString(s,x-fm.stringWidth(s),y);  // display the string
  }
}