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godot/scene/2d/navigation_agent_2d.cpp

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/*************************************************************************/
/* navigation_agent_2d.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "navigation_agent_2d.h"
#include "core/math/geometry_2d.h"
#include "scene/resources/world_2d.h"
#include "servers/navigation_server_2d.h"
void NavigationAgent2D::_bind_methods() {
ClassDB::bind_method(D_METHOD("get_rid"), &NavigationAgent2D::get_rid);
ClassDB::bind_method(D_METHOD("set_avoidance_enabled", "enabled"), &NavigationAgent2D::set_avoidance_enabled);
ClassDB::bind_method(D_METHOD("get_avoidance_enabled"), &NavigationAgent2D::get_avoidance_enabled);
ClassDB::bind_method(D_METHOD("set_path_desired_distance", "desired_distance"), &NavigationAgent2D::set_path_desired_distance);
ClassDB::bind_method(D_METHOD("get_path_desired_distance"), &NavigationAgent2D::get_path_desired_distance);
ClassDB::bind_method(D_METHOD("set_target_desired_distance", "desired_distance"), &NavigationAgent2D::set_target_desired_distance);
ClassDB::bind_method(D_METHOD("get_target_desired_distance"), &NavigationAgent2D::get_target_desired_distance);
ClassDB::bind_method(D_METHOD("set_radius", "radius"), &NavigationAgent2D::set_radius);
ClassDB::bind_method(D_METHOD("get_radius"), &NavigationAgent2D::get_radius);
ClassDB::bind_method(D_METHOD("set_neighbor_distance", "neighbor_distance"), &NavigationAgent2D::set_neighbor_distance);
ClassDB::bind_method(D_METHOD("get_neighbor_distance"), &NavigationAgent2D::get_neighbor_distance);
ClassDB::bind_method(D_METHOD("set_max_neighbors", "max_neighbors"), &NavigationAgent2D::set_max_neighbors);
ClassDB::bind_method(D_METHOD("get_max_neighbors"), &NavigationAgent2D::get_max_neighbors);
ClassDB::bind_method(D_METHOD("set_time_horizon", "time_horizon"), &NavigationAgent2D::set_time_horizon);
ClassDB::bind_method(D_METHOD("get_time_horizon"), &NavigationAgent2D::get_time_horizon);
ClassDB::bind_method(D_METHOD("set_max_speed", "max_speed"), &NavigationAgent2D::set_max_speed);
ClassDB::bind_method(D_METHOD("get_max_speed"), &NavigationAgent2D::get_max_speed);
ClassDB::bind_method(D_METHOD("set_path_max_distance", "max_speed"), &NavigationAgent2D::set_path_max_distance);
ClassDB::bind_method(D_METHOD("get_path_max_distance"), &NavigationAgent2D::get_path_max_distance);
ClassDB::bind_method(D_METHOD("set_navigation_layers", "navigation_layers"), &NavigationAgent2D::set_navigation_layers);
ClassDB::bind_method(D_METHOD("get_navigation_layers"), &NavigationAgent2D::get_navigation_layers);
ClassDB::bind_method(D_METHOD("set_navigation_layer_value", "layer_number", "value"), &NavigationAgent2D::set_navigation_layer_value);
ClassDB::bind_method(D_METHOD("get_navigation_layer_value", "layer_number"), &NavigationAgent2D::get_navigation_layer_value);
ClassDB::bind_method(D_METHOD("set_path_metadata_flags", "flags"), &NavigationAgent2D::set_path_metadata_flags);
ClassDB::bind_method(D_METHOD("get_path_metadata_flags"), &NavigationAgent2D::get_path_metadata_flags);
ClassDB::bind_method(D_METHOD("set_navigation_map", "navigation_map"), &NavigationAgent2D::set_navigation_map);
ClassDB::bind_method(D_METHOD("get_navigation_map"), &NavigationAgent2D::get_navigation_map);
ClassDB::bind_method(D_METHOD("set_target_location", "location"), &NavigationAgent2D::set_target_location);
ClassDB::bind_method(D_METHOD("get_target_location"), &NavigationAgent2D::get_target_location);
ClassDB::bind_method(D_METHOD("get_next_location"), &NavigationAgent2D::get_next_location);
ClassDB::bind_method(D_METHOD("distance_to_target"), &NavigationAgent2D::distance_to_target);
ClassDB::bind_method(D_METHOD("set_velocity", "velocity"), &NavigationAgent2D::set_velocity);
ClassDB::bind_method(D_METHOD("get_current_navigation_result"), &NavigationAgent2D::get_current_navigation_result);
ClassDB::bind_method(D_METHOD("get_current_navigation_path"), &NavigationAgent2D::get_current_navigation_path);
ClassDB::bind_method(D_METHOD("get_current_navigation_path_index"), &NavigationAgent2D::get_current_navigation_path_index);
ClassDB::bind_method(D_METHOD("is_target_reached"), &NavigationAgent2D::is_target_reached);
ClassDB::bind_method(D_METHOD("is_target_reachable"), &NavigationAgent2D::is_target_reachable);
ClassDB::bind_method(D_METHOD("is_navigation_finished"), &NavigationAgent2D::is_navigation_finished);
ClassDB::bind_method(D_METHOD("get_final_location"), &NavigationAgent2D::get_final_location);
ClassDB::bind_method(D_METHOD("_avoidance_done", "new_velocity"), &NavigationAgent2D::_avoidance_done);
ADD_GROUP("Pathfinding", "");
ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "target_location", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR), "set_target_location", "get_target_location");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "path_desired_distance", PROPERTY_HINT_RANGE, "0.1,100,0.01,suffix:px"), "set_path_desired_distance", "get_path_desired_distance");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "target_desired_distance", PROPERTY_HINT_RANGE, "0.1,100,0.01,suffix:px"), "set_target_desired_distance", "get_target_desired_distance");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "path_max_distance", PROPERTY_HINT_RANGE, "10,100,1,suffix:px"), "set_path_max_distance", "get_path_max_distance");
ADD_PROPERTY(PropertyInfo(Variant::INT, "navigation_layers", PROPERTY_HINT_LAYERS_2D_NAVIGATION), "set_navigation_layers", "get_navigation_layers");
ADD_PROPERTY(PropertyInfo(Variant::INT, "path_metadata_flags", PROPERTY_HINT_FLAGS, "Include Types,Include RIDs,Include Owners"), "set_path_metadata_flags", "get_path_metadata_flags");
ADD_GROUP("Avoidance", "");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "avoidance_enabled"), "set_avoidance_enabled", "get_avoidance_enabled");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "radius", PROPERTY_HINT_RANGE, "0.1,500,0.01,suffix:px"), "set_radius", "get_radius");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "neighbor_distance", PROPERTY_HINT_RANGE, "0.1,100000,0.01,suffix:px"), "set_neighbor_distance", "get_neighbor_distance");
ADD_PROPERTY(PropertyInfo(Variant::INT, "max_neighbors", PROPERTY_HINT_RANGE, "1,10000,1"), "set_max_neighbors", "get_max_neighbors");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "time_horizon", PROPERTY_HINT_RANGE, "0.1,10000,0.01,suffix:s"), "set_time_horizon", "get_time_horizon");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "max_speed", PROPERTY_HINT_RANGE, "0.1,100000,0.01,suffix:px/s"), "set_max_speed", "get_max_speed");
ADD_SIGNAL(MethodInfo("path_changed"));
ADD_SIGNAL(MethodInfo("target_reached"));
ADD_SIGNAL(MethodInfo("waypoint_reached", PropertyInfo(Variant::DICTIONARY, "details")));
ADD_SIGNAL(MethodInfo("link_reached", PropertyInfo(Variant::DICTIONARY, "details")));
ADD_SIGNAL(MethodInfo("navigation_finished"));
ADD_SIGNAL(MethodInfo("velocity_computed", PropertyInfo(Variant::VECTOR2, "safe_velocity")));
}
void NavigationAgent2D::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_POST_ENTER_TREE: {
// need to use POST_ENTER_TREE cause with normal ENTER_TREE not all required Nodes are ready.
// cannot use READY as ready does not get called if Node is readded to SceneTree
set_agent_parent(get_parent());
set_physics_process_internal(true);
} break;
case NOTIFICATION_PARENTED: {
if (is_inside_tree() && (get_parent() != agent_parent)) {
// only react to PARENTED notifications when already inside_tree and parent changed, e.g. users switch nodes around
// PARENTED notification fires also when Node is added in scripts to a parent
// this would spam transforms fails and world fails while Node is outside SceneTree
// when node gets reparented when joining the tree POST_ENTER_TREE takes care of this
set_agent_parent(get_parent());
set_physics_process_internal(true);
}
} break;
case NOTIFICATION_UNPARENTED: {
// if agent has no parent no point in processing it until reparented
set_agent_parent(nullptr);
set_physics_process_internal(false);
} break;
case NOTIFICATION_PAUSED: {
if (agent_parent && !agent_parent->can_process()) {
map_before_pause = NavigationServer2D::get_singleton()->agent_get_map(get_rid());
NavigationServer2D::get_singleton()->agent_set_map(get_rid(), RID());
} else if (agent_parent && agent_parent->can_process() && !(map_before_pause == RID())) {
NavigationServer2D::get_singleton()->agent_set_map(get_rid(), map_before_pause);
map_before_pause = RID();
}
} break;
case NOTIFICATION_UNPAUSED: {
if (agent_parent && !agent_parent->can_process()) {
map_before_pause = NavigationServer2D::get_singleton()->agent_get_map(get_rid());
NavigationServer2D::get_singleton()->agent_set_map(get_rid(), RID());
} else if (agent_parent && agent_parent->can_process() && !(map_before_pause == RID())) {
NavigationServer2D::get_singleton()->agent_set_map(get_rid(), map_before_pause);
map_before_pause = RID();
}
} break;
case NOTIFICATION_EXIT_TREE: {
agent_parent = nullptr;
set_physics_process_internal(false);
} break;
case NOTIFICATION_INTERNAL_PHYSICS_PROCESS: {
if (agent_parent && target_position_submitted) {
if (avoidance_enabled) {
// agent_position on NavigationServer is avoidance only and has nothing to do with pathfinding
// no point in flooding NavigationServer queue with agent position updates that get send to the void if avoidance is not used
NavigationServer2D::get_singleton()->agent_set_position(agent, agent_parent->get_global_position());
}
_check_distance_to_target();
}
} break;
}
}
NavigationAgent2D::NavigationAgent2D() {
agent = NavigationServer2D::get_singleton()->agent_create();
set_neighbor_distance(500.0);
set_max_neighbors(10);
set_time_horizon(20.0);
set_radius(10.0);
set_max_speed(200.0);
// Preallocate query and result objects to improve performance.
navigation_query = Ref<NavigationPathQueryParameters2D>();
navigation_query.instantiate();
navigation_result = Ref<NavigationPathQueryResult2D>();
navigation_result.instantiate();
}
NavigationAgent2D::~NavigationAgent2D() {
NavigationServer2D::get_singleton()->free(agent);
agent = RID(); // Pointless
}
void NavigationAgent2D::set_avoidance_enabled(bool p_enabled) {
avoidance_enabled = p_enabled;
if (avoidance_enabled) {
NavigationServer2D::get_singleton()->agent_set_callback(agent, get_instance_id(), "_avoidance_done");
} else {
NavigationServer2D::get_singleton()->agent_set_callback(agent, ObjectID(), "_avoidance_done");
}
}
bool NavigationAgent2D::get_avoidance_enabled() const {
return avoidance_enabled;
}
void NavigationAgent2D::set_agent_parent(Node *p_agent_parent) {
// remove agent from any avoidance map before changing parent or there will be leftovers on the RVO map
NavigationServer2D::get_singleton()->agent_set_callback(agent, ObjectID(), "_avoidance_done");
if (Object::cast_to<Node2D>(p_agent_parent) != nullptr) {
// place agent on navigation map first or else the RVO agent callback creation fails silently later
agent_parent = Object::cast_to<Node2D>(p_agent_parent);
if (map_override.is_valid()) {
NavigationServer2D::get_singleton()->agent_set_map(get_rid(), map_override);
} else {
NavigationServer2D::get_singleton()->agent_set_map(get_rid(), agent_parent->get_world_2d()->get_navigation_map());
}
// create new avoidance callback if enabled
set_avoidance_enabled(avoidance_enabled);
} else {
agent_parent = nullptr;
NavigationServer2D::get_singleton()->agent_set_map(get_rid(), RID());
}
}
void NavigationAgent2D::set_navigation_layers(uint32_t p_navigation_layers) {
bool navigation_layers_changed = navigation_layers != p_navigation_layers;
navigation_layers = p_navigation_layers;
if (navigation_layers_changed) {
_request_repath();
}
}
uint32_t NavigationAgent2D::get_navigation_layers() const {
return navigation_layers;
}
void NavigationAgent2D::set_navigation_layer_value(int p_layer_number, bool p_value) {
ERR_FAIL_COND_MSG(p_layer_number < 1, "Navigation layer number must be between 1 and 32 inclusive.");
ERR_FAIL_COND_MSG(p_layer_number > 32, "Navigation layer number must be between 1 and 32 inclusive.");
uint32_t _navigation_layers = get_navigation_layers();
if (p_value) {
_navigation_layers |= 1 << (p_layer_number - 1);
} else {
_navigation_layers &= ~(1 << (p_layer_number - 1));
}
set_navigation_layers(_navigation_layers);
}
bool NavigationAgent2D::get_navigation_layer_value(int p_layer_number) const {
ERR_FAIL_COND_V_MSG(p_layer_number < 1, false, "Navigation layer number must be between 1 and 32 inclusive.");
ERR_FAIL_COND_V_MSG(p_layer_number > 32, false, "Navigation layer number must be between 1 and 32 inclusive.");
return get_navigation_layers() & (1 << (p_layer_number - 1));
}
void NavigationAgent2D::set_path_metadata_flags(BitField<NavigationPathQueryParameters2D::PathMetadataFlags> p_path_metadata_flags) {
if (path_metadata_flags == p_path_metadata_flags) {
return;
}
path_metadata_flags = p_path_metadata_flags;
}
void NavigationAgent2D::set_navigation_map(RID p_navigation_map) {
map_override = p_navigation_map;
NavigationServer2D::get_singleton()->agent_set_map(agent, map_override);
_request_repath();
}
RID NavigationAgent2D::get_navigation_map() const {
if (map_override.is_valid()) {
return map_override;
} else if (agent_parent != nullptr) {
return agent_parent->get_world_2d()->get_navigation_map();
}
return RID();
}
void NavigationAgent2D::set_path_desired_distance(real_t p_dd) {
path_desired_distance = p_dd;
}
void NavigationAgent2D::set_target_desired_distance(real_t p_dd) {
target_desired_distance = p_dd;
}
void NavigationAgent2D::set_radius(real_t p_radius) {
radius = p_radius;
NavigationServer2D::get_singleton()->agent_set_radius(agent, radius);
}
void NavigationAgent2D::set_neighbor_distance(real_t p_distance) {
neighbor_distance = p_distance;
NavigationServer2D::get_singleton()->agent_set_neighbor_distance(agent, neighbor_distance);
}
void NavigationAgent2D::set_max_neighbors(int p_count) {
max_neighbors = p_count;
NavigationServer2D::get_singleton()->agent_set_max_neighbors(agent, max_neighbors);
}
void NavigationAgent2D::set_time_horizon(real_t p_time) {
time_horizon = p_time;
NavigationServer2D::get_singleton()->agent_set_time_horizon(agent, time_horizon);
}
void NavigationAgent2D::set_max_speed(real_t p_max_speed) {
max_speed = p_max_speed;
NavigationServer2D::get_singleton()->agent_set_max_speed(agent, max_speed);
}
void NavigationAgent2D::set_path_max_distance(real_t p_pmd) {
path_max_distance = p_pmd;
}
real_t NavigationAgent2D::get_path_max_distance() {
return path_max_distance;
}
void NavigationAgent2D::set_target_location(Vector2 p_location) {
target_location = p_location;
target_position_submitted = true;
_request_repath();
}
Vector2 NavigationAgent2D::get_target_location() const {
return target_location;
}
Vector2 NavigationAgent2D::get_next_location() {
update_navigation();
const Vector<Vector2> &navigation_path = navigation_result->get_path();
if (navigation_path.size() == 0) {
ERR_FAIL_COND_V_MSG(agent_parent == nullptr, Vector2(), "The agent has no parent.");
return agent_parent->get_global_position();
} else {
return navigation_path[navigation_path_index];
}
}
real_t NavigationAgent2D::distance_to_target() const {
ERR_FAIL_COND_V_MSG(agent_parent == nullptr, 0.0, "The agent has no parent.");
return agent_parent->get_global_position().distance_to(target_location);
}
bool NavigationAgent2D::is_target_reached() const {
return target_reached;
}
bool NavigationAgent2D::is_target_reachable() {
return target_desired_distance >= get_final_location().distance_to(target_location);
}
bool NavigationAgent2D::is_navigation_finished() {
update_navigation();
return navigation_finished;
}
Vector2 NavigationAgent2D::get_final_location() {
update_navigation();
const Vector<Vector2> &navigation_path = navigation_result->get_path();
if (navigation_path.size() == 0) {
return Vector2();
}
return navigation_path[navigation_path.size() - 1];
}
void NavigationAgent2D::set_velocity(Vector2 p_velocity) {
target_velocity = p_velocity;
NavigationServer2D::get_singleton()->agent_set_target_velocity(agent, target_velocity);
NavigationServer2D::get_singleton()->agent_set_velocity(agent, prev_safe_velocity);
velocity_submitted = true;
}
void NavigationAgent2D::_avoidance_done(Vector3 p_new_velocity) {
const Vector2 velocity = Vector2(p_new_velocity.x, p_new_velocity.z);
prev_safe_velocity = velocity;
if (!velocity_submitted) {
target_velocity = Vector2();
return;
}
velocity_submitted = false;
emit_signal(SNAME("velocity_computed"), velocity);
}
PackedStringArray NavigationAgent2D::get_configuration_warnings() const {
PackedStringArray warnings = Node::get_configuration_warnings();
if (!Object::cast_to<Node2D>(get_parent())) {
warnings.push_back(RTR("The NavigationAgent2D can be used only under a Node2D inheriting parent node."));
}
return warnings;
}
void NavigationAgent2D::update_navigation() {
if (agent_parent == nullptr) {
return;
}
if (!agent_parent->is_inside_tree()) {
return;
}
if (!target_position_submitted) {
return;
}
if (update_frame_id == Engine::get_singleton()->get_physics_frames()) {
return;
}
update_frame_id = Engine::get_singleton()->get_physics_frames();
Vector2 origin = agent_parent->get_global_position();
bool reload_path = false;
if (NavigationServer2D::get_singleton()->agent_is_map_changed(agent)) {
reload_path = true;
} else if (navigation_result->get_path().size() == 0) {
reload_path = true;
} else {
// Check if too far from the navigation path
if (navigation_path_index > 0) {
const Vector<Vector2> &navigation_path = navigation_result->get_path();
Vector2 segment[2];
segment[0] = navigation_path[navigation_path_index - 1];
segment[1] = navigation_path[navigation_path_index];
Vector2 p = Geometry2D::get_closest_point_to_segment(origin, segment);
if (origin.distance_to(p) >= path_max_distance) {
// To faraway, reload path
reload_path = true;
}
}
}
if (reload_path) {
navigation_query->set_start_position(origin);
navigation_query->set_target_position(target_location);
navigation_query->set_navigation_layers(navigation_layers);
navigation_query->set_metadata_flags(path_metadata_flags);
if (map_override.is_valid()) {
navigation_query->set_map(map_override);
} else {
navigation_query->set_map(agent_parent->get_world_2d()->get_navigation_map());
}
NavigationServer2D::get_singleton()->query_path(navigation_query, navigation_result);
navigation_finished = false;
navigation_path_index = 0;
emit_signal(SNAME("path_changed"));
}
if (navigation_result->get_path().size() == 0) {
return;
}
// Check if we can advance the navigation path
if (navigation_finished == false) {
// Advances to the next far away location.
const Vector<Vector2> &navigation_path = navigation_result->get_path();
const Vector<int32_t> &navigation_path_types = navigation_result->get_path_types();
const TypedArray<RID> &navigation_path_rids = navigation_result->get_path_rids();
const Vector<int64_t> &navigation_path_owners = navigation_result->get_path_owner_ids();
while (origin.distance_to(navigation_path[navigation_path_index]) < path_desired_distance) {
Dictionary details;
const Vector2 waypoint = navigation_path[navigation_path_index];
details[SNAME("location")] = waypoint;
int waypoint_type = -1;
if (path_metadata_flags.has_flag(NavigationPathQueryParameters2D::PathMetadataFlags::PATH_METADATA_INCLUDE_TYPES)) {
const NavigationPathQueryResult2D::PathSegmentType type = NavigationPathQueryResult2D::PathSegmentType(navigation_path_types[navigation_path_index]);
details[SNAME("type")] = type;
waypoint_type = type;
}
if (path_metadata_flags.has_flag(NavigationPathQueryParameters2D::PathMetadataFlags::PATH_METADATA_INCLUDE_RIDS)) {
details[SNAME("rid")] = navigation_path_rids[navigation_path_index];
}
if (path_metadata_flags.has_flag(NavigationPathQueryParameters2D::PathMetadataFlags::PATH_METADATA_INCLUDE_OWNERS)) {
const ObjectID waypoint_owner_id = ObjectID(navigation_path_owners[navigation_path_index]);
// Get a reference to the owning object.
Object *owner = nullptr;
if (waypoint_owner_id.is_valid()) {
owner = ObjectDB::get_instance(waypoint_owner_id);
}
details[SNAME("owner")] = owner;
}
// Emit a signal for the waypoint
emit_signal(SNAME("waypoint_reached"), details);
// Emit a signal if we've reached a navigation link
if (waypoint_type == NavigationPathQueryResult2D::PATH_SEGMENT_TYPE_LINK) {
emit_signal(SNAME("link_reached"), details);
}
// Move to the next waypoint on the list
navigation_path_index += 1;
// Check to see if we've finished our route
if (navigation_path_index == navigation_path.size()) {
_check_distance_to_target();
navigation_path_index -= 1;
navigation_finished = true;
target_position_submitted = false;
emit_signal(SNAME("navigation_finished"));
break;
}
}
}
}
void NavigationAgent2D::_request_repath() {
navigation_result->reset();
target_reached = false;
navigation_finished = false;
update_frame_id = 0;
}
void NavigationAgent2D::_check_distance_to_target() {
if (!target_reached) {
if (distance_to_target() < target_desired_distance) {
target_reached = true;
emit_signal(SNAME("target_reached"));
}
}
}
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