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godot/scene/2d/shape_cast_2d.cpp
Rémi Verschelde d95794ec8a
One Copyright Update to rule them all 
As many open source projects have started doing it, we're removing the
current year from the copyright notice, so that we don't need to bump
it every year.

It seems like only the first year of publication is technically
relevant for copyright notices, and even that seems to be something
that many companies stopped listing altogether (in a version controlled
codebase, the commits are a much better source of date of publication
than a hardcoded copyright statement).

We also now list Godot Engine contributors first as we're collectively
the current maintainers of the project, and we clarify that the
"exclusive" copyright of the co-founders covers the timespan before
opensourcing (their further contributions are included as part of Godot
Engine contributors).

Also fixed "cf." Frenchism - it's meant as "refer to / see".
2023-01-05 13:25:55 +01:00

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/**************************************************************************/
/* shape_cast_2d.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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 "shape_cast_2d.h"
#include "core/config/engine.h"
#include "core/core_string_names.h"
#include "scene/2d/collision_object_2d.h"
#include "scene/2d/physics_body_2d.h"
#include "scene/resources/circle_shape_2d.h"
#include "servers/physics_2d/godot_physics_server_2d.h"
void ShapeCast2D::set_target_position(const Vector2 &p_point) {
target_position = p_point;
if (is_inside_tree() && (Engine::get_singleton()->is_editor_hint() || get_tree()->is_debugging_collisions_hint())) {
queue_redraw();
}
}
Vector2 ShapeCast2D::get_target_position() const {
return target_position;
}
void ShapeCast2D::set_margin(real_t p_margin) {
margin = p_margin;
}
real_t ShapeCast2D::get_margin() const {
return margin;
}
void ShapeCast2D::set_max_results(int p_max_results) {
max_results = p_max_results;
}
int ShapeCast2D::get_max_results() const {
return max_results;
}
void ShapeCast2D::set_collision_mask(uint32_t p_mask) {
collision_mask = p_mask;
}
uint32_t ShapeCast2D::get_collision_mask() const {
return collision_mask;
}
void ShapeCast2D::set_collision_mask_value(int p_layer_number, bool p_value) {
ERR_FAIL_COND_MSG(p_layer_number < 1, "Collision layer number must be between 1 and 32 inclusive.");
ERR_FAIL_COND_MSG(p_layer_number > 32, "Collision layer number must be between 1 and 32 inclusive.");
uint32_t mask = get_collision_mask();
if (p_value) {
mask |= 1 << (p_layer_number - 1);
} else {
mask &= ~(1 << (p_layer_number - 1));
}
set_collision_mask(mask);
}
bool ShapeCast2D::get_collision_mask_value(int p_layer_number) const {
ERR_FAIL_COND_V_MSG(p_layer_number < 1, false, "Collision layer number must be between 1 and 32 inclusive.");
ERR_FAIL_COND_V_MSG(p_layer_number > 32, false, "Collision layer number must be between 1 and 32 inclusive.");
return get_collision_mask() & (1 << (p_layer_number - 1));
}
int ShapeCast2D::get_collision_count() const {
return result.size();
}
bool ShapeCast2D::is_colliding() const {
return collided;
}
Object *ShapeCast2D::get_collider(int p_idx) const {
ERR_FAIL_INDEX_V_MSG(p_idx, result.size(), nullptr, "No collider found.");
if (result[p_idx].collider_id.is_null()) {
return nullptr;
}
return ObjectDB::get_instance(result[p_idx].collider_id);
}
RID ShapeCast2D::get_collider_rid(int p_idx) const {
ERR_FAIL_INDEX_V_MSG(p_idx, result.size(), RID(), "No collider RID found.");
return result[p_idx].rid;
}
int ShapeCast2D::get_collider_shape(int p_idx) const {
ERR_FAIL_INDEX_V_MSG(p_idx, result.size(), -1, "No collider shape found.");
return result[p_idx].shape;
}
Vector2 ShapeCast2D::get_collision_point(int p_idx) const {
ERR_FAIL_INDEX_V_MSG(p_idx, result.size(), Vector2(), "No collision point found.");
return result[p_idx].point;
}
Vector2 ShapeCast2D::get_collision_normal(int p_idx) const {
ERR_FAIL_INDEX_V_MSG(p_idx, result.size(), Vector2(), "No collision normal found.");
return result[p_idx].normal;
}
real_t ShapeCast2D::get_closest_collision_safe_fraction() const {
return collision_safe_fraction;
}
real_t ShapeCast2D::get_closest_collision_unsafe_fraction() const {
return collision_unsafe_fraction;
}
void ShapeCast2D::set_enabled(bool p_enabled) {
enabled = p_enabled;
queue_redraw();
if (is_inside_tree() && !Engine::get_singleton()->is_editor_hint()) {
set_physics_process_internal(p_enabled);
}
if (!p_enabled) {
collided = false;
}
}
bool ShapeCast2D::is_enabled() const {
return enabled;
}
void ShapeCast2D::set_shape(const Ref<Shape2D> &p_shape) {
shape = p_shape;
if (p_shape.is_valid()) {
shape->connect(CoreStringNames::get_singleton()->changed, callable_mp(this, &ShapeCast2D::_redraw_shape));
shape_rid = shape->get_rid();
}
update_configuration_warnings();
queue_redraw();
}
Ref<Shape2D> ShapeCast2D::get_shape() const {
return shape;
}
void ShapeCast2D::set_exclude_parent_body(bool p_exclude_parent_body) {
if (exclude_parent_body == p_exclude_parent_body) {
return;
}
exclude_parent_body = p_exclude_parent_body;
if (!is_inside_tree()) {
return;
}
if (Object::cast_to<CollisionObject2D>(get_parent())) {
if (exclude_parent_body) {
exclude.insert(Object::cast_to<CollisionObject2D>(get_parent())->get_rid());
} else {
exclude.erase(Object::cast_to<CollisionObject2D>(get_parent())->get_rid());
}
}
}
bool ShapeCast2D::get_exclude_parent_body() const {
return exclude_parent_body;
}
void ShapeCast2D::_redraw_shape() {
queue_redraw();
}
void ShapeCast2D::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_ENTER_TREE: {
if (enabled && !Engine::get_singleton()->is_editor_hint()) {
set_physics_process_internal(true);
} else {
set_physics_process_internal(false);
}
if (Object::cast_to<CollisionObject2D>(get_parent())) {
if (exclude_parent_body) {
exclude.insert(Object::cast_to<CollisionObject2D>(get_parent())->get_rid());
} else {
exclude.erase(Object::cast_to<CollisionObject2D>(get_parent())->get_rid());
}
}
} break;
case NOTIFICATION_EXIT_TREE: {
if (enabled) {
set_physics_process_internal(false);
}
} break;
case NOTIFICATION_DRAW: {
#ifdef TOOLS_ENABLED
ERR_FAIL_COND(!is_inside_tree());
if (!Engine::get_singleton()->is_editor_hint() && !get_tree()->is_debugging_collisions_hint()) {
break;
}
if (shape.is_null()) {
break;
}
Color draw_col = collided ? Color(1.0, 0.01, 0) : get_tree()->get_debug_collisions_color();
if (!enabled) {
float g = draw_col.get_v();
draw_col.r = g;
draw_col.g = g;
draw_col.b = g;
}
// Draw continuous chain of shapes along the cast.
const int steps = MAX(2, target_position.length() / shape->get_rect().get_size().length() * 4);
for (int i = 0; i <= steps; ++i) {
Vector2 t = (real_t(i) / steps) * target_position;
draw_set_transform(t, 0.0, Size2(1, 1));
shape->draw(get_canvas_item(), draw_col);
}
draw_set_transform(Vector2(), 0.0, Size2(1, 1));
// Draw an arrow indicating where the ShapeCast is pointing to.
if (target_position != Vector2()) {
const real_t max_arrow_size = 6;
const real_t line_width = 1.4;
bool no_line = target_position.length() < line_width;
real_t arrow_size = CLAMP(target_position.length() * 2 / 3, line_width, max_arrow_size);
if (no_line) {
arrow_size = target_position.length();
} else {
draw_line(Vector2(), target_position - target_position.normalized() * arrow_size, draw_col, line_width);
}
Transform2D xf;
xf.rotate(target_position.angle());
xf.translate_local(Vector2(no_line ? 0 : target_position.length() - arrow_size, 0));
Vector<Vector2> pts = {
xf.xform(Vector2(arrow_size, 0)),
xf.xform(Vector2(0, 0.5 * arrow_size)),
xf.xform(Vector2(0, -0.5 * arrow_size))
};
Vector<Color> cols = { draw_col, draw_col, draw_col };
draw_primitive(pts, cols, Vector<Vector2>());
}
#endif
} break;
case NOTIFICATION_INTERNAL_PHYSICS_PROCESS: {
if (!enabled) {
break;
}
_update_shapecast_state();
} break;
}
}
void ShapeCast2D::_update_shapecast_state() {
result.clear();
ERR_FAIL_COND_MSG(shape.is_null(), "Invalid shape.");
Ref<World2D> w2d = get_world_2d();
ERR_FAIL_COND(w2d.is_null());
PhysicsDirectSpaceState2D *dss = PhysicsServer2D::get_singleton()->space_get_direct_state(w2d->get_space());
ERR_FAIL_COND(!dss);
Transform2D gt = get_global_transform();
PhysicsDirectSpaceState2D::ShapeParameters params;
params.shape_rid = shape_rid;
params.transform = gt;
params.motion = gt.basis_xform(target_position);
params.margin = margin;
params.exclude = exclude;
params.collision_mask = collision_mask;
params.collide_with_bodies = collide_with_bodies;
params.collide_with_areas = collide_with_areas;
collision_safe_fraction = 0.0;
collision_unsafe_fraction = 0.0;
bool prev_collision_state = collided;
if (target_position != Vector2()) {
dss->cast_motion(params, collision_safe_fraction, collision_unsafe_fraction);
if (collision_unsafe_fraction < 1.0) {
// Move shape transform to the point of impact,
// so we can collect contact info at that point.
gt.set_origin(gt.get_origin() + params.motion * (collision_unsafe_fraction + CMP_EPSILON));
params.transform = gt;
}
}
// Regardless of whether the shape is stuck or it's moved along
// the motion vector, we'll only consider static collisions from now on.
params.motion = Vector2();
bool intersected = true;
while (intersected && result.size() < max_results) {
PhysicsDirectSpaceState2D::ShapeRestInfo info;
intersected = dss->rest_info(params, &info);
if (intersected) {
result.push_back(info);
params.exclude.insert(info.rid);
}
}
collided = !result.is_empty();
if (prev_collision_state != collided) {
queue_redraw();
}
}
void ShapeCast2D::force_shapecast_update() {
_update_shapecast_state();
}
void ShapeCast2D::add_exception_rid(const RID &p_rid) {
exclude.insert(p_rid);
}
void ShapeCast2D::add_exception(const CollisionObject2D *p_node) {
ERR_FAIL_NULL_MSG(p_node, "The passed Node must be an instance of CollisionObject2D.");
add_exception_rid(p_node->get_rid());
}
void ShapeCast2D::remove_exception_rid(const RID &p_rid) {
exclude.erase(p_rid);
}
void ShapeCast2D::remove_exception(const CollisionObject2D *p_node) {
ERR_FAIL_NULL_MSG(p_node, "The passed Node must be an instance of CollisionObject2D.");
remove_exception_rid(p_node->get_rid());
}
void ShapeCast2D::clear_exceptions() {
exclude.clear();
}
void ShapeCast2D::set_collide_with_areas(bool p_clip) {
collide_with_areas = p_clip;
}
bool ShapeCast2D::is_collide_with_areas_enabled() const {
return collide_with_areas;
}
void ShapeCast2D::set_collide_with_bodies(bool p_clip) {
collide_with_bodies = p_clip;
}
bool ShapeCast2D::is_collide_with_bodies_enabled() const {
return collide_with_bodies;
}
Array ShapeCast2D::_get_collision_result() const {
Array ret;
for (int i = 0; i < result.size(); ++i) {
const PhysicsDirectSpaceState2D::ShapeRestInfo &sri = result[i];
Dictionary col;
col["point"] = sri.point;
col["normal"] = sri.normal;
col["rid"] = sri.rid;
col["collider"] = ObjectDB::get_instance(sri.collider_id);
col["collider_id"] = sri.collider_id;
col["shape"] = sri.shape;
col["linear_velocity"] = sri.linear_velocity;
ret.push_back(col);
}
return ret;
}
PackedStringArray ShapeCast2D::get_configuration_warnings() const {
PackedStringArray warnings = Node2D::get_configuration_warnings();
if (shape.is_null()) {
warnings.push_back(RTR("This node cannot interact with other objects unless a Shape2D is assigned."));
}
return warnings;
}
void ShapeCast2D::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_enabled", "enabled"), &ShapeCast2D::set_enabled);
ClassDB::bind_method(D_METHOD("is_enabled"), &ShapeCast2D::is_enabled);
ClassDB::bind_method(D_METHOD("set_shape", "shape"), &ShapeCast2D::set_shape);
ClassDB::bind_method(D_METHOD("get_shape"), &ShapeCast2D::get_shape);
ClassDB::bind_method(D_METHOD("set_target_position", "local_point"), &ShapeCast2D::set_target_position);
ClassDB::bind_method(D_METHOD("get_target_position"), &ShapeCast2D::get_target_position);
ClassDB::bind_method(D_METHOD("set_margin", "margin"), &ShapeCast2D::set_margin);
ClassDB::bind_method(D_METHOD("get_margin"), &ShapeCast2D::get_margin);
ClassDB::bind_method(D_METHOD("set_max_results", "max_results"), &ShapeCast2D::set_max_results);
ClassDB::bind_method(D_METHOD("get_max_results"), &ShapeCast2D::get_max_results);
ClassDB::bind_method(D_METHOD("is_colliding"), &ShapeCast2D::is_colliding);
ClassDB::bind_method(D_METHOD("get_collision_count"), &ShapeCast2D::get_collision_count);
ClassDB::bind_method(D_METHOD("force_shapecast_update"), &ShapeCast2D::force_shapecast_update);
ClassDB::bind_method(D_METHOD("get_collider", "index"), &ShapeCast2D::get_collider);
ClassDB::bind_method(D_METHOD("get_collider_rid", "index"), &ShapeCast2D::get_collider_rid);
ClassDB::bind_method(D_METHOD("get_collider_shape", "index"), &ShapeCast2D::get_collider_shape);
ClassDB::bind_method(D_METHOD("get_collision_point", "index"), &ShapeCast2D::get_collision_point);
ClassDB::bind_method(D_METHOD("get_collision_normal", "index"), &ShapeCast2D::get_collision_normal);
ClassDB::bind_method(D_METHOD("get_closest_collision_safe_fraction"), &ShapeCast2D::get_closest_collision_safe_fraction);
ClassDB::bind_method(D_METHOD("get_closest_collision_unsafe_fraction"), &ShapeCast2D::get_closest_collision_unsafe_fraction);
ClassDB::bind_method(D_METHOD("add_exception_rid", "rid"), &ShapeCast2D::add_exception_rid);
ClassDB::bind_method(D_METHOD("add_exception", "node"), &ShapeCast2D::add_exception);
ClassDB::bind_method(D_METHOD("remove_exception_rid", "rid"), &ShapeCast2D::remove_exception_rid);
ClassDB::bind_method(D_METHOD("remove_exception", "node"), &ShapeCast2D::remove_exception);
ClassDB::bind_method(D_METHOD("clear_exceptions"), &ShapeCast2D::clear_exceptions);
ClassDB::bind_method(D_METHOD("set_collision_mask", "mask"), &ShapeCast2D::set_collision_mask);
ClassDB::bind_method(D_METHOD("get_collision_mask"), &ShapeCast2D::get_collision_mask);
ClassDB::bind_method(D_METHOD("set_collision_mask_value", "layer_number", "value"), &ShapeCast2D::set_collision_mask_value);
ClassDB::bind_method(D_METHOD("get_collision_mask_value", "layer_number"), &ShapeCast2D::get_collision_mask_value);
ClassDB::bind_method(D_METHOD("set_exclude_parent_body", "mask"), &ShapeCast2D::set_exclude_parent_body);
ClassDB::bind_method(D_METHOD("get_exclude_parent_body"), &ShapeCast2D::get_exclude_parent_body);
ClassDB::bind_method(D_METHOD("set_collide_with_areas", "enable"), &ShapeCast2D::set_collide_with_areas);
ClassDB::bind_method(D_METHOD("is_collide_with_areas_enabled"), &ShapeCast2D::is_collide_with_areas_enabled);
ClassDB::bind_method(D_METHOD("set_collide_with_bodies", "enable"), &ShapeCast2D::set_collide_with_bodies);
ClassDB::bind_method(D_METHOD("is_collide_with_bodies_enabled"), &ShapeCast2D::is_collide_with_bodies_enabled);
ClassDB::bind_method(D_METHOD("_get_collision_result"), &ShapeCast2D::_get_collision_result);
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "enabled"), "set_enabled", "is_enabled");
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "shape", PROPERTY_HINT_RESOURCE_TYPE, "Shape2D"), "set_shape", "get_shape");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "exclude_parent"), "set_exclude_parent_body", "get_exclude_parent_body");
ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "target_position", PROPERTY_HINT_NONE, "suffix:px"), "set_target_position", "get_target_position");
ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "margin", PROPERTY_HINT_RANGE, "0,100,0.01,suffix:px"), "set_margin", "get_margin");
ADD_PROPERTY(PropertyInfo(Variant::INT, "max_results"), "set_max_results", "get_max_results");
ADD_PROPERTY(PropertyInfo(Variant::INT, "collision_mask", PROPERTY_HINT_LAYERS_2D_PHYSICS), "set_collision_mask", "get_collision_mask");
ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "collision_result", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR), "", "_get_collision_result");
ADD_GROUP("Collide With", "collide_with");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "collide_with_areas", PROPERTY_HINT_LAYERS_3D_PHYSICS), "set_collide_with_areas", "is_collide_with_areas_enabled");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "collide_with_bodies", PROPERTY_HINT_LAYERS_3D_PHYSICS), "set_collide_with_bodies", "is_collide_with_bodies_enabled");
}
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