Package picasso.parser.language

Class ExpressionTreeNode

java.lang.Object

picasso.parser.language.ExpressionTreeNode

All Implemented Interfaces:

EvaluatableExpression

Direct Known Subclasses:

Constant, RGBColor, UnaryFunction, Variable, X, Y

public abstract class ExpressionTreeNode
extends Object
implements EvaluatableExpression

All elements of the language (e.g., that make up ExpressionTree) should extend ExpressionTreeNode.

Author:

Robert C. Duvall, Sara Sprenkle

Field Summary

Fields

Modifier and Type	Field	Description
protected static Map<ExpressionTreeNode,Object>	gelementsToValue

Constructor Summary

Constructors

Constructor	Description
ExpressionTreeNode()

Method Summary

Modifier and Type	Method	Description
abstract RGBColor	evaluate(double x, double y)	Evaluate this expression, given x and y

Methods inherited from class java.lang.Object

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

Field Details

gelementsToValue

protected static Map<ExpressionTreeNode,Object> gelementsToValue

Constructor Details

ExpressionTreeNode

public ExpressionTreeNode()

Method Details

evaluate

public abstract RGBColor evaluate(double x,
 double y)

Evaluate this expression, given x and y

Specified by:

evaluate in interface EvaluatableExpression

Parameters:

x - the value of x

y - the value of y

Returns:

the result of evaluating the expression for the given values of x and y