wyvern.lib.predicates
Class BlocksSpellPredicate

java.lang.Object
  wyvern.lib.predicates.BlocksSpellPredicate

All Implemented Interfaces:

LocationPredicate, Predicate

public class BlocksSpellPredicate

extends java.lang.Object

implements LocationPredicate

This predicate checks for the presence of objects that block spells.

Version:

1.0, Jan 31, 1998

Author:

Steve Yegge

Field Summary

static BlocksSpellPredicate

PREDICATE

Constructor Summary

BlocksSpellPredicate()

Method Summary

static boolean	canWalk(GameObject obj, int x, int y) Returns true if the target object's can-walk property includes the specified point, in map coordinates.
boolean	predicate(GameObject obj) This method is provided in case someone tries to use a BlocksSpellPredicate as a normal Predicate function.
boolean	predicate(int x, int y, GameObject obj) Does a more specialized check on the object, looking at the can-walk list to see if it actually allows motion there.

Methods inherited from class java.lang.Object

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

Field Detail

PREDICATE

public static final BlocksSpellPredicate PREDICATE

Constructor Detail

BlocksSpellPredicate

public BlocksSpellPredicate()

Method Detail

predicate

public boolean predicate(GameObject obj)

This method is provided in case someone tries to use a BlocksSpellPredicate as a normal Predicate function. It won't be able to figure out properly if the object is blocking, because it can't check the object's can_walk list.

Specified by:

predicate in interface Predicate

Parameters:

obj - any GameObject

Returns:

true if the object blocks spells

predicate

public boolean predicate(int x,
                         int y,
                         GameObject obj)

Does a more specialized check on the object, looking at the can-walk list to see if it actually allows motion there.

Specified by:

predicate in interface LocationPredicate

Parameters:

x - map x location

y - map y location

obj - object at (x, y)

Returns:

true if the object blocks spells at (x, y)

canWalk

public static boolean canWalk(GameObject obj,
                              int x,
                              int y)

Returns true if the target object's can-walk property includes the specified point, in map coordinates.

Parameters:

obj - an object to examine

x - map x coordinate

y - map y coordinate

Returns:

true if the object has a "can-walk" PointList, and the list contains the passed (x, y) map location. If there's no can-walk list, or the list doesn't contain the passed point, returns false.