slogo.instruction

Class ClearScreen

java.lang.Object

slogo.GrammarElement

slogo.instruction.Instruction

slogo.instruction.ClearScreen

public class ClearScreen
extends Instruction

A CS instruction has zero components: when called, it will clear the screen and return the turtle to its home coordinates. To evaluate a CS instruction the turtle is reset, and the lines are cleared.

The value returned by evaluating a CS instruction is just the name of the instruction itself.

Field Summary

Fields inherited from class slogo.GrammarElement

gelementsToValue

Constructor Summary

Constructors

Constructor and Description
ClearScreen()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(Context c) Evaluate this instruction in a Context.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ClearScreen

public ClearScreen()

Method Detail

evaluate

public java.lang.Object evaluate(Context c)

Evaluate this instruction in a Context.

Specified by:

evaluate in class Instruction

Parameters:

c - the Context for the evaluation

Returns:

null

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

Returns:

a String representing this instruction as CS