Java Turtle Animation Issue

Question

I am trying to make an animation where two rectangles will appear and disappear from frame when you type in: c with Turtle Graphics. But the problem I have is that I do not understand how to incorporate turtle graphics into a loop. For this, I have to use do-while loop. I am also suppose to have the rectangles that I made move horizontally across the screen. I have the general idea set out, but I do not know how to use turtle graphics with a loop. My code is not the most orderly when I tried to set it up here.

/**
* Write a description of class Animation here.
* 
* @author (author)
* @version 
*/

import java.util.Scanner;
import java.awt.*;
class Animation
{      
//set conditions for turtle to start drawing
public void prepareTurtleToDraw(Turtle myrtle, Color color, int x, int y)
{
   myrtle.hide();
   myrtle.penUp();               //pick up the pen to avoid leaving a trail when moving the turtle
   myrtle.setColor(color);       //set myrtle's color
   myrtle.moveTo(x, y);          //move to coordinates
   myrtle.penDown();             //put the pen down to start drawing
}//end of prepareTurtleToDraw method

//draw a line
public void drawLine(Turtle myrtle, int x1, int y1, int x2, int y2)//, int width)
{
    myrtle.moveTo(x1, y1);      //moves to this coordinate first
    myrtle.moveTo(x2, y2);      //then moves to this coordinate
    //myrtle.setPenWidth(width);  //this adjusts the size of the lines
}//end of drawLine method   

public static void pressC()
{
    String userInput = "";                                  //declare and initialize a String variable
    char key = ' ';                                         //declare and initialize a char variable
    Scanner in = new Scanner(System.in);                    //construct a Scanner object

    System.out.println("Please press the c key to watch the animation.");
    //do-while loop to wait for the user to enter the letter c
    do  
    {
        userInput = in.next();                                  //accept one token from the keyboard
        in.nextLine();                                          //flush the buffer
        key = userInput.charAt(0);                              //picks off the first character from the userInput String variable

    }
    while(key != 'c');                                      //do-while condition statement 

    System.out.println("Thank you. You may continue");

 }//end of main method
}
public class AnimationTester
{
public static void main(String[] args)
{
    //Picture pictureObj = new Picture("");        //create a Picture object for the maze background image, has name and etc.
    World worldObj = new World();                            //create a World object to draw in
    //worldObj.setPicture(pictureObj);                         //set the maze background image in the World object
    Turtle lertle = new Turtle(300, 150, worldObj);             //create a Turtle object to do the drawing
    Animation turt = new Animation();

    Turtle dyrtle = new Turtle(150, 150, worldObj);    

    turt.prepareTurtleToDraw(lertle, Color.BLACK, 250, 150);
    turt.drawLine(lertle, 250, 150, 400, 150);
    turt.drawLine(lertle, 400, 150, 400, 250);
    turt.drawLine(lertle, 400, 250, 250, 250);
    turt.drawLine(lertle, 250, 250, 250, 150);

    turt.prepareTurtleToDraw(dyrtle, Color.RED, 150, 150);
    turt.drawLine(dyrtle, 150, 150, 260, 75);
    turt.drawLine(dyrtle, 260, 75, 335, 150);
    turt.drawLine(dyrtle, 335, 150, 225, 225);
    turt.drawLine(dyrtle, 225, 225, 150, 150);


    System.out.println(worldObj);
}    
}

Java Turtle Animation Issue

Answers (1)

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