/** 
  * Search Engine Applet 1.0.1
  * @author Robert John Morton
  * @version 22 October 1999 modified 10 July 2009, 10 April 2012
  * @copyright Robert John Morton (all rights reserved) */

import java.applet.*;  // all the gubbins to make the applet work
import javax.swing.*;  // Swing GUI
import java.awt.*;     // for graphics operations (GUI)
import java.util.*;    // for stream tokenizer in formatText()

public class img1panel extends JPanel {  // TITLE & SUMMARY DISPLAY PANEL

  /* Declare two fonts for the lettering used on this panel. The first is 
  for the title text and the second is for URLs and the summary text. */

  private static final Font 
    font1 = new Font("Sans",Font.PLAIN,18),
    font2 = new Font("Sans",Font.PLAIN,17);

  private FontMetrics 
    fm,   // common FontMetrics variable
    fm1,  // FontMetrics for title font
    fm2;  // FontMetrics for summary font

  private search hf;  // instance reference of the search applet
  private Color bg;   // background colour for panel

  // Declare the colour for the title font.
  private static final Color titleBlue = new Color(16,32,192);

  private static final int
    Xt = 5,   // inset for drawing title lines
    Xs = 15;  // inset for drawing summary lines

  private int 
    fh1,    // font height for title font
    fh2,    // font height for summary font
    space,  // horizontal number of pixels that equals one space character
    sp1,    // space size for title font
    sp2,    // space size for summary font
    W, H,   // width and height of panel's display area
    Wt,     // width of title lines
    Ws,     // width of summary lines
    Qt,     // index pf first summary line
    Qs,     // total number of lines in title + summary
    q;      // index of first line of summary text (after the title)

  // Accommodation for up to 10 lines of title + summary text
  private String S[] = new String[10];

  img1panel(int W, int H, Color bg, search hf) {
    this.bg = bg;      // copy background colour to local variable
    this.W = W;        // copy panel width to local variable
    this.H = H;        // copy panel height to local variable
    this.hf = hf;      // copy applet's instance reference to local variable
    Wt = W - Xt - Xt;  // maximum width of text on title lines
    Ws = W - Xt - Xs;  // maximum width of text on summary lines

    /* For each of the lettering fonts font1 and font 2, get its
    measurements (in pixels), the height of a line of text + 2 for
    interline spacing pixels, and the width of a 'space' character. */

    fm1 = getFontMetrics(font1); fm2 = getFontMetrics(font2);
    fh1 = fm1.getHeight() + 2;   fh2 = fm2.getHeight() + 2;
    sp1 = fm1.stringWidth(" ");  sp2 = fm2.stringWidth(" ");
  }


  // DISPLAY THIS DOCUMENT'S TITLE AND DESCRIPTION

  void showSummary(String Title, String Descr) {

    // clear the title + summary array
    for(int i = 0; i < S.length; i++)
      S[i] = "";
    q = 0;                          // index number of first title line
    space = sp1;                    // set space size for title font
    fm = fm1;                       // set FontMetrics for title font
    Qt = formatText(Title, Wt, 3);  // form the title lines
    space = sp2;                    // set space size for summary font
    fm = fm2;                       // set FontMetrics for summary font
    Qs = formatText(Descr, Ws, 9);  // form the description lines

    repaint();  // schedule a repaint via the event despatching thread
  }


  // DISPLAY THE DOCUMENT'S TITLE, DESCRIPTION AND URL

  public void paint(Graphics g) {

    // draw the background image onto the applet canvas
    g.drawImage(hf.IMG1,0,0,this);

    g.setFont(font1);              // set title font
    g.setColor(titleBlue);         // set text foreground colour for title
    int δY = fh1;                  // vertical position of current line
    for(int i = 0; i < Qt; i++) {
      g.drawString(S[i], Xt, δY);  // display each line of the title
      δY += fh1;                   // inch down to the next title line
    }
    g.setFont(font2);              // set summary font
    g.setColor(Color.black);       // set text foreground colour for summary
    for(int i = Qt; i < Qs; i++) {
      g.drawString(S[i], Xs, δY);  // display each line of the summary
      δY += fh2;                   // inch down to the next summary line
    }
  }


  /* SET A STRING OF TEXT INTO A MULTI-LINE
  ARRAY OF A SPECIFIED MAXIMUM LINE WIDTH */

  private int formatText(String text, int width, int E) {

    // This enables you to pick of one word at a time from the input string
    StringTokenizer st = new StringTokenizer(text);

    String s = "";   // current output line
    int x = 0;       // current width of output line
    String word;     // current word

    /* While there is still another word available in the input string, 
    pick the new word from the string and find its width in pixels. */

    while(st.hasMoreTokens()) {
      word = st.nextToken(); int w = fm.stringWidth(word);

      /* If adding this word to the current line of text will cause the
      line to overshoot the maximum line width, reset the line width
      to the width of the left margin and the line length to zero. */

      if((x + space + w > width) && q < E) {S[q++] = s; s = ""; x = 0;}

      s += " " + word;  // add a space + new word to current line
      x += space + w;   // set line width to include space + new word
    }
    S[q++] = s;  // final short line
    return q;    // number of lines used in the string array S
  }
}