/** 
  * Search Engine Applet 1.0.1
  * @author Robert John Morton
  * @version 22 October 1999 modified 10 July 2009, 10 April 2012
    JFramed Sat 04 Mar 2017 11:35:32 BRT 
  * @copyright Robert John Morton (all rights reserved) */

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

  private static final Font  // for url and summary number
    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

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

  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)

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


  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

    fm1 = getFontMetrics(font1);  // get the font1's dimensions
    fh1 = fm1.getHeight() + 2;    // get the height of a line of text + 2
                                  // for interline spacing
    sp1 = fm1.stringWidth(" ");   // get the width of the space character
    fm2 = getFontMetrics(font2);  // get font2's dimensions
    fh2 = fm2.getHeight() + 2;    // get the height of a line of text + 2
                                  // for interline spacing
    sp2 = fm2.stringWidth(" ");   // get the width of the space character
  }


  // DISPLAY DOCUMENT'S TITLE, DESCRIPTION
  void showSummary(String Title, String Descr) {
    for(int i = 0; i < S.length; i++)
      S[i] = "";                  // clear the title + summary array
    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 DOCUMENT'S TITLE, DESCRIPTION & URL
  public void paint(Graphics g) {
    g.drawImage(hf.IMG1,0,0,this);  // draw the background image
                                    // onto the applet canvas
    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, OF A SPECIFIED MAX-
  IMUM LINE WIDTH, INTO A MULTI-LINE ARRAY */

  private int formatText(String text, int width, int E) {
    // to pick one word at a time from 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 another word is available from the input string
    while(st.hasMoreTokens()) {
      word = st.nextToken();         // get new word from input string
      int w = fm.stringWidth(word);  // get its width

      // if adding this word will cause overshoot
      if((x + space + w > width) && q < E) {
       S[q++] = s;
       s = "";  // reset line to its inset value
       x = 0;   // reset its length to zero
     }
     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
  }
}