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Sep 2012
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turtle graphics

Hi, please check this exercise
The Logo language made the concept of turtle graphics famous. Imagine
a mechanical turtle that walks around the room under the control of a Java application. The turtle
holds a pen in one of two positions, up or down. While the pen is down, the turtle traces out shapes
as itmoves, and while the pen is up, the turtle moves about freely without writing anything. In this
problem, you’ll simulate the operation of the turtle and create a computerized sketchpad.
Use a 20-by-20 array floor that’s 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 application must process are shown in the following

Command Meaning
1 Pen up
2 Pen down
3 Turn right
4 Turn left
5,10 Move forward 10 spaces (replace 10 for a different number of spaces)
6 Display the 20-by-20 array
9 End of data (sentinel

Suppose that the turtle is somewhere near the centre of the floor. The following “program”
would draw and display 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 (display the array) is given, wherever there’s a 1 in the array, display an asterisk or any
character you choose. Wherever there’s a 0, display a blank.
Write an application 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.

I'd created a two dimensional array floor and initialized its elements to zeros. but my brain stopped working :-s I guess I need to create methods turnRight and turnLeft but actually I need more hints that help me give these two methods the effective functionality. so can you provide me with more hints please ?

2. Re: turtle graphics

What does your question have to do with Java?

db

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