slogo.instruction.drawing
Class OneParameterInstruction

java.lang.Object
  extended by slogo.language.GrammarElement
      extended by slogo.instruction.Instruction
          extended by slogo.instruction.drawing.OneParameterInstruction
Direct Known Subclasses:
Back, Forward, Left, Right, SetPenColor, SetX, SetY

public abstract class OneParameterInstruction
extends Instruction


Field Summary
protected  GrammarElement param
           
 
Fields inherited from class slogo.language.GrammarElement
gelementsToValue
 
Constructor Summary
OneParameterInstruction(GrammarElement param)
           
 
Method Summary
abstract  java.lang.Object evaluate(Context c)
          Evaluate this language construct in some context.
 
Methods inherited from class slogo.instruction.Instruction
evaluateNumericExpression
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

param

protected GrammarElement param
Constructor Detail

OneParameterInstruction

public OneParameterInstruction(GrammarElement param)
Method Detail

evaluate

public abstract 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.

Overrides:
evaluate in class Instruction
Parameters:
c - context in which the evaluation takes place
Returns:
the result of evaluating the construct