slogo.instruction

Class PenDownP

java.lang.Object

slogo.GrammarElement

slogo.instruction.Instruction

slogo.instruction.PenDownP

public class PenDownP
extends Instruction

A PENDOWNP instruction has no components: when called, it returns true or false, depending on whether the pen is up or down To evaluate a PENDOWNP instruction, the getPen method is called on the turtle.

The value returned by evaluating a PENDOWNP instruction is the expression itself.

Field Summary

Fields inherited from class slogo.GrammarElement

gelementsToValue

Constructor Summary

Constructors

Constructor and Description
PenDownP()

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

PenDownP

public PenDownP()

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:

the turtle's pen

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

Returns:

a String representing this instruction as PENDOWNP