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MCTargetStrategy.java
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MCTargetStrategy.java
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package net.citizensnpcs.npc.ai;
import java.lang.reflect.Field;
import net.citizensnpcs.api.ai.AttackStrategy;
import net.citizensnpcs.api.ai.EntityTarget;
import net.citizensnpcs.api.ai.NavigatorParameters;
import net.citizensnpcs.api.ai.TargetType;
import net.citizensnpcs.api.ai.event.CancelReason;
import net.citizensnpcs.api.npc.NPC;
import net.citizensnpcs.util.NMS;
import net.citizensnpcs.util.PlayerAnimation;
import net.citizensnpcs.util.nms.PlayerNavigation;
import net.minecraft.server.v1_7_R3.AttributeInstance;
import net.minecraft.server.v1_7_R3.Entity;
import net.minecraft.server.v1_7_R3.EntityLiving;
import net.minecraft.server.v1_7_R3.EntityPlayer;
import net.minecraft.server.v1_7_R3.Navigation;
import net.minecraft.server.v1_7_R3.PathEntity;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_7_R3.entity.CraftEntity;
import org.bukkit.entity.LivingEntity;
public class MCTargetStrategy implements PathStrategy, EntityTarget {
private final boolean aggro;
private int attackTicks;
private CancelReason cancelReason;
private final Entity handle;
private final NPC npc;
private final NavigatorParameters parameters;
private final Entity target;
private final TargetNavigator targetNavigator;
public MCTargetStrategy(NPC npc, org.bukkit.entity.Entity target, boolean aggro, NavigatorParameters params) {
this.npc = npc;
this.parameters = params;
this.handle = ((CraftEntity) npc.getEntity()).getHandle();
this.target = ((CraftEntity) target).getHandle();
Navigation nav = NMS.getNavigation(this.handle);
this.targetNavigator = nav != null && !params.useNewPathfinder() ? new NavigationFieldWrapper(nav)
: new AStarTargeter();
this.aggro = aggro;
}
private boolean canAttack() {
return attackTicks == 0
&& (handle.boundingBox.e > target.boundingBox.b && handle.boundingBox.b < target.boundingBox.e)
&& closeEnough(distanceSquared()) && hasLineOfSight();
}
@Override
public void clearCancelReason() {
cancelReason = null;
}
private boolean closeEnough(double distance) {
return distance <= parameters.attackRange();
}
private double distanceSquared() {
return handle.getBukkitEntity().getLocation(HANDLE_LOCATION)
.distanceSquared(target.getBukkitEntity().getLocation(TARGET_LOCATION));
}
@Override
public CancelReason getCancelReason() {
return cancelReason;
}
@Override
public LivingEntity getTarget() {
return (LivingEntity) target.getBukkitEntity();
}
@Override
public Location getTargetAsLocation() {
return getTarget().getLocation();
}
@Override
public TargetType getTargetType() {
return TargetType.ENTITY;
}
private boolean hasLineOfSight() {
return ((LivingEntity) handle.getBukkitEntity()).hasLineOfSight(target.getBukkitEntity());
}
@Override
public boolean isAggressive() {
return aggro;
}
private void setPath() {
targetNavigator.setPath();
}
@Override
public void stop() {
targetNavigator.stop();
}
@Override
public String toString() {
return "MCTargetStrategy [target=" + target + "]";
}
@Override
public boolean update() {
if (target == null || !target.getBukkitEntity().isValid()) {
cancelReason = CancelReason.TARGET_DIED;
return true;
}
if (target.world != handle.world) {
cancelReason = CancelReason.TARGET_MOVED_WORLD;
return true;
}
if (cancelReason != null) {
return true;
}
if (target.world.getWorld().getFullTime() % 10 == 0) {
setPath();
}
NMS.look(handle, target);
if (aggro && canAttack()) {
AttackStrategy strategy = parameters.attackStrategy();
if (strategy != null && strategy.handle((LivingEntity) handle.getBukkitEntity(), getTarget())) {
} else if (strategy != parameters.defaultAttackStrategy()) {
parameters.defaultAttackStrategy().handle((LivingEntity) handle.getBukkitEntity(), getTarget());
}
attackTicks = ATTACK_DELAY_TICKS;
}
if (attackTicks > 0) {
attackTicks--;
}
return false;
}
private class AStarTargeter implements TargetNavigator {
private int failureTimes = 0;
private PathStrategy strategy;
public AStarTargeter() {
setStrategy();
}
@Override
public void setPath() {
setStrategy();
strategy.update();
CancelReason subReason = strategy.getCancelReason();
if (subReason == CancelReason.STUCK) {
if (failureTimes++ > 10) {
cancelReason = strategy.getCancelReason();
}
} else {
failureTimes = 0;
cancelReason = strategy.getCancelReason();
}
}
private void setStrategy() {
Location location = target.getBukkitEntity().getLocation(TARGET_LOCATION);
strategy = npc.isFlyable() ? new FlyingAStarNavigationStrategy(npc, location, parameters)
: new AStarNavigationStrategy(npc, location, parameters);
}
@Override
public void stop() {
strategy.stop();
}
}
private class NavigationFieldWrapper implements TargetNavigator {
boolean j = true, k, l, m;
private final Navigation navigation;
float range;
private NavigationFieldWrapper(Navigation navigation) {
this.navigation = navigation;
this.k = navigation.c();
this.l = navigation.a();
try {
if (navigation instanceof PlayerNavigation) {
if (P_NAV_E != null)
range = (float) ((AttributeInstance) P_NAV_E.get(navigation)).getValue();
if (P_NAV_J != null)
j = P_NAV_J.getBoolean(navigation);
if (P_NAV_M != null)
m = P_NAV_M.getBoolean(navigation);
} else {
if (E_NAV_E != null)
range = (float) ((AttributeInstance) E_NAV_E.get(navigation)).getValue();
if (E_NAV_J != null)
j = E_NAV_J.getBoolean(navigation);
if (E_NAV_M != null)
m = E_NAV_M.getBoolean(navigation);
}
} catch (Exception ex) {
range = parameters.range();
}
}
public PathEntity findPath(Entity from, Entity to) {
return handle.world.findPath(from, to, range, j, k, l, m);
}
@Override
public void setPath() {
navigation.a(parameters.avoidWater());
navigation.a(findPath(handle, target), parameters.speed());
}
@Override
public void stop() {
NMS.stopNavigation(navigation);
}
}
private static interface TargetNavigator {
void setPath();
void stop();
}
private static final int ATTACK_DELAY_TICKS = 20;
static final AttackStrategy DEFAULT_ATTACK_STRATEGY = new AttackStrategy() {
@Override
public boolean handle(LivingEntity attacker, LivingEntity bukkitTarget) {
EntityLiving handle = NMS.getHandle(attacker);
EntityLiving target = NMS.getHandle(bukkitTarget);
if (handle instanceof EntityPlayer) {
EntityPlayer humanHandle = (EntityPlayer) handle;
humanHandle.attack(target);
PlayerAnimation.ARM_SWING.play(humanHandle.getBukkitEntity());
} else {
NMS.attack(handle, target);
}
return false;
}
};
private static Field E_NAV_E, E_NAV_J, E_NAV_M;
private static final Location HANDLE_LOCATION = new Location(null, 0, 0, 0);
private static Field P_NAV_E, P_NAV_J, P_NAV_M;
private static final Location TARGET_LOCATION = new Location(null, 0, 0, 0);
static {
E_NAV_E = NMS.getField(Navigation.class, "e");
E_NAV_J = NMS.getField(Navigation.class, "j");
E_NAV_M = NMS.getField(Navigation.class, "m");
P_NAV_E = NMS.getField(PlayerNavigation.class, "e");
P_NAV_J = NMS.getField(PlayerNavigation.class, "j");
P_NAV_M = NMS.getField(PlayerNavigation.class, "m");
}
}