Thread: Drawing Polygrams

Hey, everyone. I'm having trouble with a class I'm making called Turtle. I want it so that you can choose to draw a rectangle or a "regular shape". A "regular shape" is any shape that has every side as the same length (the number of sides is decided by the user). The rectangle method works just fine but I can't seem to get the angles right on the regular shape method so my shape always comes out wrong. Here is the code.

import java.util.Scanner;
public class Turtle extends SimpleTurtle
{
 
  public Turtle (int x, int y, Picture picture) 
  {
 
    super(x,y,picture);
  }
 
 
  public Turtle (int x, int y, ModelDisplay modelDisplayer) 
  {
 
    super(x,y,modelDisplayer);
  }
 
 
  public Turtle (ModelDisplay modelDisplay) 
  {
 
    super(modelDisplay);
  }
 
  public Turtle (Picture p)
  {
 
    super(p);
  }
  public void drawRectangle(int rectwidth, int rectlength)
  {
    /*Scanner keyboard = new Scanner(System.in);
    System.out.println("Enter the length.");
    rectlength = keyboard.nextInt();
    System.out.println("Enter the width.");
    rectwidth = keyboard.nextInt();*/
    int value1 = 2;
    this.turnRight();
    this.forward(rectwidth);
    this.turnRight();
    this.forward(rectlength);
    this.turnRight();
    this.forward(rectwidth);
    this.turnRight();
    this.forward(rectlength);
 
  }
   public void drawRegular(int numside, int lengthside)
  {
     int angle = (((numside - 2) * 180) / (numside));
     this.turn(angle);
     for (int i=0;i<numside;i++){
 
 
    this.forward(lengthside);}
     this.turn(angle);
   }
  public static void main(String[] args)
  {
    World world1=new World();
    Turtle turtle1=new Turtle(world1);
    Scanner keyboard = new Scanner(System.in);
 
    int choice= 3;
    System.out.println("Input '1' for a rectangular figure or '2' for a regular figure.");
 
 
 
    for (int i=1;i<9999;i++) {
      if (choice == 1)
      {
        int rectwidth=0;
      int rectlength=0;
 
        System.out.println("Enter the width of the rectangle:");
        rectwidth = keyboard.nextInt();
        System.out.println("Enter the length of the rectangle:");
        rectlength = keyboard.nextInt();
        if ((rectwidth < 1 || rectlength < 1))
        {
         System.out.println("Incorrect input. All values of width and length must be nonzero positive numbers."); 
        }
        else{
          turtle1.drawRectangle(rectwidth, rectlength);}
      }
      else if(choice == 2)
      {
        int numside=0;
      int lengthside=0;
        System.out.println("Input the number of sides");
        numside = keyboard.nextInt();
        System.out.println("Input the length of a side");
        lengthside = keyboard.nextInt();
        if ((numside < 1 || lengthside < 1))
        {
         System.out.println("Incorrect input. All values of sides and length must be nonzero positive numbers."); 
        }
        else{
          turtle1.drawRegular(numside, lengthside);}
 
      }
      else
      {
        System.out.println("Input '1' for a rectangular figure or '2' for a regular figure.");
        choice = keyboard.nextInt();
      }
    }
 
  }
}

Help would be appreciated.

For the regular shape, the user enters the number of sides and the length of each side and the turtle travels moves the direction its supposed to. It just doesn't turn the correct amount for the angle

What angle does it turn? How does that compare to the correct amount to turn?

Way too many classes in the zip file. Can you reduce it to one file that shows the problem?

Originally Posted by Norm

What angle does it turn? How does that compare to the correct amount to turn?

Way too many classes in the zip file. Can you reduce it to one file that shows the problem?

My bad. Here is a zip file with just SimpleTurtle. That's my problem. I don't know how it should turn exactly. I have no idea how to go about doing that.