// Drawing polygons with turtles.
// Created by Stanzi on 11/9/97
// Updated by Lyn on 4/12/98
// Updated by Stella 11/07

import java.awt.*;       // Import Abstract Window Toolkit
import java.applet.*;    // Import Applet stuff

public class PolygonWorld extends TurtleWorld {
 
 ParameterFrame params;
 String parameterNames [ ] = {"Sides", "Length"}; 
 CheckboxGroup checkboxes = new CheckboxGroup();
 //Checkbox tailBox = new Checkbox("polygonTail", checkboxes, true);
 Checkbox whileBox = new Checkbox("polygonWhile", checkboxes, false); 
 Checkbox forBox = new Checkbox("polygonFor", checkboxes, false); 
  
 public void setup() {
  params = new ParameterFrame("Polygon Parameters", 150, 125, parameterNames);
  Panel northPanel = params.getNorthPanel();
  northPanel.setLayout(new GridLayout(2,1));
  //northPanel.add(tailBox);
  northPanel.add(whileBox);
  northPanel.add(forBox);
  params.show();
 }
  
 public void run() {
  PolygonMaker polly = new PolygonMaker();
  int sides = params.getIntParam("Sides");
  int length = params.getIntParam("Length");
  /*
  if (tailBox.getState()) {
   polly.polygon(sides, length);
  } else 
  */
  if (whileBox.getState()) {
   polly.polygonWhile(sides, length);
  } else { // if (forBox.getState())
   polly.polygonFor(sides, length);
  }
 }
 
  //------------------------------------------------------------------------------
  // The following main method is needed to run the applet as an application

  public static void main (String[] args) {
    runAsApplication(new PolygonWorld(), "PolygonWorld"); 
  }
   
}


class PolygonMaker extends Turtle {//extends TurtleWorld { 
 
 // while loop implementation
 public void polygonWhile(int sides, int length){
   double angle = 360.0/(double)sides;
   while (sides > 0) {
     fd(length);
     lt(angle);
     sides = sides - 1;
   }
 }

// for loop implementation to draw a polygon
 public void polygonFor(int sides, int length){
   double angle = 360.0/(double)sides;
   for (int s = 1; s <= sides; s=s+1) {
     fd(length);
     lt(angle);
   }
 }

 
}