slogo.instruction

Class PenDownP

java.lang.Object

slogo.GrammarElement

slogo.instruction.Instruction

slogo.instruction.PenDownP

public class PenDownP
extends Instruction

Returns 1 (:TRUE) if the pen is down, 0 (:FALSE) if it's up.

Field Summary

Fields inherited from class slogo.GrammarElement

gelementsToValue

Constructor Summary

Constructors

Constructor and Description
PenDownP() Represents a PENDOWNP instruction

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(Context c) Evaluate this language construct in some context.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

PenDownP

public PenDownP()

Represents a PENDOWNP instruction

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

Returns:

the String representation of PenDownP

evaluate

public java.lang.Object evaluate(Context c)

Description copied from class: GrammarElement

Evaluate this language construct in some context. The evaluation may have side-effects, e.g., moving a turtle.

Specified by:

evaluate in class Instruction

Parameters:

c - is the Context of what we are evaluating

Returns:

1 if the pen is down and 0 if the pen is up