/**
 * ColorApplet - this uses a ColorPanel to choose colors for a web page
 * size -- 
 *   at least 120 width x 120 height pixels
 * parameters --
 *   required for color bars -
 *   "thickness"  : thickness of the bars, "9" is the default
 *   "background" : background color of page applet lives in, "808080"
 *
 *   colors being chosen - 
 *   "c0","c1","c2","c3","c4","c5","c6" :
 *      value "bgColor" means background,
 *      value null (parameter not set) means end of parameters,
 *      otherwise value given will be the text displayed
 *
 * public functions --
 *   getColor(int x) : get the xth color
 *   setColor(int x, String c) : set the xth color
 *
 * architecture --
 *   ColorApplet (sets up children, processes parameters)
 *     UseColor (how ColorPanel notifies ChoicePanel a color was chosen)
 *     ColorPanel (a big hexagon)
 *       ColorBar (three bars)
 *       ColorHandle (a hexagon at the intersection of the three bars)
 *     ChoicePanel (bunch of checkboxes)
 *       ChoiceCheck
 */

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

public final class ColorApplet extends Applet {
  ColorPanel c;                                           /* the color panel */
  ChoicePanel choices;         /* checkboxes and panel that reflects choices */

  String myColors[];
  public String getColor(int x) { return choices.colors[x]; }
  public void   setColor(int x, String newcolor) { 
    if (newcolor == "") newcolor = null;
    choices.which = x;
    choices.UseColor(newcolor);
  }

  static Color s2c(String s) {
    return new Color(s==null ? 0x808080 : Integer.parseInt(s, 16));
  }

  public void init() {
    Dimension d = this.size();
    String param = getParameter("background");
    Color outside = s2c(param);
    setLayout(new GridLayout(1,2,10,0));
    setBackground(outside);
    setFont(new Font("TimesRoman", Font.PLAIN, getFont().getSize()));

    /* the choices, checkboxes and text */
    choices = new ChoicePanel
      (this, Math.max(120, d.width-d.height-10), d.height);
    choices.names[0] = getParameter("c0");
    choices.names[1] = getParameter("c1");
    choices.names[2] = getParameter("c2");
    choices.names[3] = getParameter("c3");
    choices.names[4] = getParameter("c4");
    choices.names[5] = getParameter("c5");
    choices.names[6] = getParameter("c6");
    choices.init();
    add(choices);

    /* the color panel, chooses colors */
    param = getParameter("thickness");
    int thick = (param==null ? 9 : Integer.parseInt(param));
    this.c = new ColorPanel(
      choices, outside, thick, d.width/2-11, d.height);
    add(c);
  }

  public void start() { c.start(); }
  public void stop() { c.stop(); }
  public void destroy() {}
}