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SentinelUtilities.java
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SentinelUtilities.java
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package org.mcmonkey.sentinel;
import net.citizensnpcs.api.ai.EntityTarget;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.entity.Entity;
import org.bukkit.entity.LivingEntity;
import org.bukkit.inventory.EntityEquipment;
import org.bukkit.inventory.ItemStack;
import org.bukkit.potion.PotionEffectType;
import org.bukkit.util.Vector;
import org.mcmonkey.sentinel.targeting.SentinelTarget;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Random;
import java.util.UUID;
import java.util.regex.Pattern;
public class SentinelUtilities {
/**
* A random object for reuse.
*/
public static Random random = new Random();
/**
* Returns the item held in an entity's hand.
*/
public static ItemStack getHeldItem(LivingEntity entity) {
if (SentinelTarget.v1_9) {
return entity.getEquipment().getItemInMainHand();
}
else {
return entity.getEquipment().getItemInHand();
}
}
/**
* Traces a ray from a start to an end, returning the end of the ray (stopped early if there are solid blocks in the way).
*/
public static Location rayTrace(Location start, Location end) {
double dSq = start.distanceSquared(end);
if (dSq < 1) {
if (end.getBlock().getType().isSolid()) {
return start.clone();
}
return end.clone();
}
double dist = Math.sqrt(dSq);
Vector move = end.toVector().subtract(start.toVector()).multiply(1.0 / dist);
int iters = (int) Math.ceil(dist);
Location cur = start.clone();
Location next = cur.clone().add(move);
for (int i = 0; i < iters; i++) {
if (next.getBlock().getType().isSolid()) {
return cur;
}
cur = cur.add(move);
next = next.add(move);
}
return cur;
}
/**
* Picks an accessible location near the start location, within a range.
*/
public static Location pickNear(Location start, double range) {
Location hit = rayTrace(start.clone().add(0, 1.5, 0), start.clone().add(
SentinelUtilities.randomDecimal(-range, range), 1.5, SentinelUtilities.randomDecimal(-range, range)));
if (hit.subtract(0, 1, 0).getBlock().getType().isSolid()) {
return hit;
}
return hit.subtract(0, 1, 0);
}
/**
* Look up table for pre-compiled regex values.
*/
public static HashMap<String, Pattern> regexes = new HashMap<>(128);
/**
* Gets a compiled regex pattern for a string of the regex.
* More efficient than recompiling every-time due to lookup-table usage.
*/
public static Pattern regexFor(String input) {
Pattern result = regexes.get(input);
if (result != null) {
return result;
}
result = Pattern.compile(input, Pattern.CASE_INSENSITIVE);
regexes.put(input, result);
return result;
}
/**
* Returns the string of a regex that matches the name (if any).
*/
public static String getRegexTarget(String name, List<String> regexes) {
for (String str : regexes) {
Pattern pattern = SentinelUtilities.regexFor(".*" + str + ".*");
if (pattern.matcher(name).matches()) {
return str;
}
}
return null;
}
/**
* Returns whether a list of regex values match the a string.
*/
public static boolean isRegexTargeted(String name, List<String> regexes) {
for (String str : regexes) {
Pattern pattern = SentinelUtilities.regexFor(".*" + str + ".*");
if (pattern.matcher(name).matches()) {
return true;
}
}
return false;
}
/**
* Normalizes Mincraft's yaws (which can be negative or can exceed 360)
* by turning them into proper yaw values that only go from 0 to 359.
*/
public static float normalizeYaw(float yaw) {
yaw = yaw % 360;
if (yaw < 0) {
yaw += 360.0;
}
return yaw;
}
/**
* Gets the yaw angle value (in degrees) for a vector.
*/
public static float getYaw(Vector vector) {
double dx = vector.getX();
double dz = vector.getZ();
double yaw = 0;
// Set yaw
if (dx != 0) {
// Set yaw start value based on dx
if (dx < 0) {
yaw = 1.5 * Math.PI;
}
else {
yaw = 0.5 * Math.PI;
}
yaw -= Math.atan(dz / dx); // or atan2?
}
else if (dz < 0) {
yaw = Math.PI;
}
return (float) (-yaw * (180.0 / Math.PI));
}
/**
* Gets a random decimal from a minimum value to a maximum value.
*/
public static double randomDecimal(double min, double max) {
return (random.nextDouble() * (max - min)) + min;
}
/**
* Returns when an item is considered to be an air item.
*/
public static boolean isAir(ItemStack its) {
return its == null || its.getType() == Material.AIR;
}
/**
* Gets the entity for a given UUID.
*/
public static Entity getEntityForID(UUID id) {
if (!SentinelTarget.v1_12) {
for (World world : Bukkit.getServer().getWorlds()) {
for (Entity e : world.getEntities()) {
if (e.getUniqueId().equals(id)) {
return e;
}
}
}
return null;
}
return Bukkit.getServer().getEntity(id);
}
/**
* Returns whether an entity is invisible (when invisible targets are ignorable).
*/
public static boolean isInvisible(LivingEntity entity) {
EntityEquipment eq = entity.getEquipment();
if (!SentinelPlugin.instance.ignoreInvisible
|| !entity.hasPotionEffect(PotionEffectType.INVISIBILITY)) {
return false;
}
if (SentinelTarget.v1_9) {
if (!isAir(eq.getItemInMainHand()) || !isAir(eq.getItemInOffHand())) {
return false;
}
}
else {
if (!isAir(eq.getItemInHand())) {
return false;
}
}
return isAir(eq.getBoots()) && isAir(eq.getLeggings()) && isAir(eq.getChestplate()) && isAir(eq.getHelmet());
}
/**
* Gets the entity target referenced by a CitizensAPI {@code EntityTarget} object.
* Should never return null except in error cases.
*/
public static Entity getTargetFor(EntityTarget targ) {
if (SentinelTarget.v1_9) {
return targ.getTarget();
}
try {
Method meth = EntityTarget.class.getMethod("getTarget");
meth.setAccessible(true);
return (LivingEntity) meth.invoke(targ);
}
catch (Exception ex) {
ex.printStackTrace();
}
return targ.getTarget(); // If the pre-1.9 reflection call failed, just call it directly and let Java produce an exception that will propagate up normally.
}
/**
* Gets a 'launch detail' (starting location with direction vector set to correct firing direction, and a vector holding the exact launch vector, scaled to the correct speed).
*/
public static HashMap.SimpleEntry<Location, Vector> getLaunchDetail(Location start, Location target, Vector lead) {
double speeda;
double angt = Double.POSITIVE_INFINITY;
double sbase = SentinelPlugin.instance.minShootSpeed;
for (speeda = sbase; speeda <= sbase + 15; speeda += 5) {
// TODO: Mathematically calculate a valid starting speed, to avoid pointlessly looping on a math utility.
angt = SentinelUtilities.getArrowAngle(start, target, speeda, 20);
if (!Double.isInfinite(angt)) {
break;
}
}
if (Double.isInfinite(angt)) {
return null;
}
double hangT = SentinelUtilities.hangtime(angt, speeda, target.getY() - start.getY(), 20);
Location to = target.clone().add(lead.clone().multiply(hangT));
Vector relative = to.clone().subtract(start.toVector()).toVector();
double deltaXZ = Math.sqrt(relative.getX() * relative.getX() + relative.getZ() * relative.getZ());
if (deltaXZ == 0) {
deltaXZ = 0.1;
}
for (speeda = sbase; speeda <= sbase + 15; speeda += 5) {
angt = SentinelUtilities.getArrowAngle(start, to, speeda, 20);
if (!Double.isInfinite(angt)) {
break;
}
}
if (Double.isInfinite(angt)) {
return null;
}
relative.setY(Math.tan(angt) * deltaXZ);
relative = relative.normalize();
Vector normrel = relative.clone();
speeda = speeda + (1.188 * hangT * hangT);
relative = relative.multiply(speeda / 20.0);
start.setDirection(normrel);
return new HashMap.SimpleEntry<>(start, relative);
}
/**
* Calculates the ideal angle to fire an arrow at to hit a target (roughly based on older Sentry code).
*
* Can return {@code Double.NEGATIVE_INFINITY} when hitting the target is impossible.
*/
public static double getArrowAngle(Location fireFrom, Location fireTo, double speed, double gravity) {
Vector delta = fireTo.clone().subtract(fireFrom).toVector();
double deltaXZ = Math.sqrt(delta.getX() * delta.getX() + delta.getZ() * delta.getZ());
if (deltaXZ == 0) {
deltaXZ = 0.1;
}
double deltaY = fireTo.getY() - fireFrom.getY();
double v2 = speed * speed;
double v4 = v2 * v2;
double basic = gravity * (gravity * deltaXZ * deltaXZ + 2 * deltaY * v2);
if (v4 < basic) {
return Double.NEGATIVE_INFINITY;
}
else {
return Math.atan((v2 - Math.sqrt(v4 - basic)) / (gravity * deltaXZ));
}
}
/**
* Calculates the hang-time (time from shot until landing) of a projectile (roughly based on older Sentry code).
*/
public static double hangtime(double launchAngle, double vel, double deltaY, double gravity) {
double a = vel * Math.sin(launchAngle);
double b = -2 * gravity * deltaY;
double a2 = a * a + b;
if (a2 < 0) {
return 0;
}
return (a + Math.sqrt(a2)) / gravity;
}
/**
* Concatenates (combines) an array of strings with spaces in between - just a shorthand/helper method.
*/
public static String concatWithSpaces(String[] strs, int start) {
StringBuilder temp = new StringBuilder();
for (int i = start; i < strs.length; i++) {
temp.append(strs[i]).append(" ");
}
return temp.toString().trim();
}
/**
* Constant: name of the standard encoding to prefer (UTF-8).
*/
public final static String ENCODING = "UTF-8";
/**
* Constant: The size of a buffer, 10 kilobytes.
*/
public final static int BUFFER_10_KB = 1024 * 10;
/**
* Converts an input stream to a string (of the stream's contents).
*
* This only needs to exist because Java inexplicably has no easy native way to accomplish this.
*/
public static String streamToString(InputStream is) {
try {
final char[] buffer = new char[BUFFER_10_KB];
final StringBuilder out = new StringBuilder();
try (Reader in = new InputStreamReader(is, ENCODING)) {
while (true) {
int rsz = in.read(buffer, 0, buffer.length);
if (rsz < 0) {
break;
}
out.append(buffer, 0, rsz);
}
}
return out.toString();
}
catch (Exception ex) {
return null;
}
}
}