Can someone help program this for me?

Can someone please help me out with this JAVA program!?

• (Turtle Graphics) The Logo language, which is popular among young computer users, made the concept of turtle graphics famous. Imagine a mechanical turtle that walks around the room under the control of a Java program. The turtle holds a pen in one of two positions, up or down. While the pen is down, the turtle traces out shapes as it moves; while the pen is up, the turtle moves about freely without writing anything. In this problem you will simulate the operation of the turtle and create a computerized sketchpad as well. Use a 20-by-20 array floor which is initialized to zeros. Read commands from an array that contains them. Keep track of the current position of the turtle at all times and whether the pen is currently up or down. Assume that the turtle always starts at position 0,0 of the floor with its pen up. The set of turtle commands your program must process are as follows: Command Meaning 1 Pen up 2 Pen down 3 Turn right 4 Turn left 5,10 Move forward 10 spaces (or a number other than 10) 6 Print the 20-by-20 array 9 End of data (sentinel) Suppose that the turtle is somewhere near the center of the floor. The following "program" would draw and print a 12-by-12 square leaving the pen in the up position: 2 5,12 3 5,12 3 5,12 3 5,12 1 6 9 As the turtle moves with the pen down, set the appropriate elements of array floor to 1s. When the 6 command (print) is given, wherever there is a 1 in the array, display an asterisk or some other character you choose. Wherever there is a zero, display a blank. Write a program to implement the turtle graphics capabilities discussed here. Write several turtle graphics programs to draw interesting shapes. Add other commands to increase the power of your turtle graphics language.

• Answer:

  Break the problem up. 1. Start by writing a class that reads the commands and converts them to something you understand. (This is how I'd implement it. I'd create a CommandReader and a Command class. The CommandReader would have several methods. read() which would return one Command at a time and hasMore(). The Command would have a main commend (aka pen up, pen down) and an optional argument (aka distance). You can use a series of Constants to help you with identifying each command.) 2. Write another class that displays the graphics. This class has the array inside and would have a few methods associated with it like paint (aka print) and drawLine. In this case, paint would do a bunch of System.out that would display the grid. DrawLine would accept four arguments x1,y1, x2, y2. This would give a starting point in the array and an end point in the array. Just implement the problem for when either x varies or y varies. If you really want extra credit, then you can have x and y vary using the formula for a line with slope of rise over run. 3. Write another class that keeps track of state. This is essentially your main program, but the other classes are more important. public class Turtle { public static final int PEN_UP = 1; public static final int PEN_DOWN = 2; public static final int TURN_RIGHT = 3; public static final int TURN_LEFT = 4; public static final int MOVE = 5; public static final int PRINT = 6; public static final int END_OF_DATA = 9; private Graphic g = new Graphic(20,20); private int currentLocationX = 0; private int currentLocationY = 0; private boolean penDown = false; private int direction = 0; public static void main(String[] args) { CommandReader reader = new CommandReader("myFileName"); while(reader.hasMore()) { Command command = reader.read(); int instruction = command.getCommand(); switch(instruction) { case PEN_UP: penDown = false; break; case PEN_DOWN: penDown = true; break; case TURN_RIGHT: //update direction break; case TURN_LEFT: // update direction break; case MOVE: int newLocationX = ;//This needs to get updated based on direction int newLocationY = ; if(!penUp) { graphic.drawLine(currentLocationX, currentLocationY, newLocationX, newLocationY); } currentLocationX = newLocationX; currentLocationY = newLocationY; break; case PRINT: graphic.paint(); case END_OF_DATA: reader.close(); break; default: System.out.println(instruction + " is not supported"); break; } // You should probably add a method that prints out the state to help you debug. } } }