text: /*************************************************************************/
  /*  light_occluder_2d.cpp                                                */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 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 "light_occluder_2d.h"
  
  #include "core/engine.h"
  
  #define LINE_GRAB_WIDTH 8
  
  #ifdef TOOLS_ENABLED
  Rect2 OccluderPolygon2D::_edit_get_rect() const {
  
  	if (rect_cache_dirty) {
  		if (closed) {
  			const Vector2 *r = polygon.ptr();
  			item_rect = Rect2();
  			for (int i = 0; i < polygon.size(); i++) {
  				Vector2 pos = r[i];
  				if (i == 0)
  					item_rect.position = pos;
  				else
  					item_rect.expand_to(pos);
  			}
  			rect_cache_dirty = false;
  		} else {
  			if (polygon.size() == 0) {
  				item_rect = Rect2();
  			} else {
  				Vector2 d = Vector2(LINE_GRAB_WIDTH, LINE_GRAB_WIDTH);
  				item_rect = Rect2(polygon[0] - d, 2 * d);
  				for (int i = 1; i < polygon.size(); i++) {
  					item_rect.expand_to(polygon[i] - d);
  					item_rect.expand_to(polygon[i] + d);
  				}
  			}
  		}
  	}
  
  	return item_rect;
  }
  
  bool OccluderPolygon2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {
  
  	if (closed) {
  		return Geometry::is_point_in_polygon(p_point, Variant(polygon));
  	} else {
  		const real_t d = LINE_GRAB_WIDTH / 2 + p_tolerance;
  		const Vector2 *points = polygon.ptr();
  		for (int i = 0; i < polygon.size() - 1; i++) {
  			Vector2 p = Geometry::get_closest_point_to_segment_2d(p_point, &points[i]);
  			if (p.distance_to(p_point) <= d)
  				return true;
  		}
  
  		return false;
  	}
  }
  #endif
  
  void OccluderPolygon2D::set_polygon(const Vector<Vector2> &p_polygon) {
  
  	polygon = p_polygon;
  	rect_cache_dirty = true;
  	VS::get_singleton()->canvas_occluder_polygon_set_shape(occ_polygon, p_polygon, closed);
  	emit_changed();
  }
  
  Vector<Vector2> OccluderPolygon2D::get_polygon() const {
  
  	return polygon;
  }
  
  void OccluderPolygon2D::set_closed(bool p_closed) {
  
  	if (closed == p_closed)
  		return;
  	closed = p_closed;
  	if (polygon.size())
  		VS::get_singleton()->canvas_occluder_polygon_set_shape(occ_polygon, polygon, closed);
  	emit_changed();
  }
  
  bool OccluderPolygon2D::is_closed() const {
  
  	return closed;
  }
  
  void OccluderPolygon2D::set_cull_mode(CullMode p_mode) {
  
  	cull = p_mode;
  	VS::get_singleton()->canvas_occluder_polygon_set_cull_mode(occ_polygon, VS::CanvasOccluderPolygonCullMode(p_mode));
  }
  
  OccluderPolygon2D::CullMode OccluderPolygon2D::get_cull_mode() const {
  
  	return cull;
  }
  
  RID OccluderPolygon2D::get_rid() const {
  
  	return occ_polygon;
  }
  
  void OccluderPolygon2D::_bind_methods() {
  
  	ClassDB::bind_method(D_METHOD("set_closed", "closed"), &OccluderPolygon2D::set_closed);
  	ClassDB::bind_method(D_METHOD("is_closed"), &OccluderPolygon2D::is_closed);
  
  	ClassDB::bind_method(D_METHOD("set_cull_mode", "cull_mode"), &OccluderPolygon2D::set_cull_mode);
  	ClassDB::bind_method(D_METHOD("get_cull_mode"), &OccluderPolygon2D::get_cull_mode);
  
  	ClassDB::bind_method(D_METHOD("set_polygon", "polygon"), &OccluderPolygon2D::set_polygon);
  	ClassDB::bind_method(D_METHOD("get_polygon"), &OccluderPolygon2D::get_polygon);
  
  	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "closed"), "set_closed", "is_closed");
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "cull_mode", PROPERTY_HINT_ENUM, "Disabled,ClockWise,CounterClockWise"), "set_cull_mode", "get_cull_mode");
  	ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR2_ARRAY, "polygon"), "set_polygon", "get_polygon");
  
  	BIND_ENUM_CONSTANT(CULL_DISABLED);
  	BIND_ENUM_CONSTANT(CULL_CLOCKWISE);
  	BIND_ENUM_CONSTANT(CULL_COUNTER_CLOCKWISE);
  }
  
  OccluderPolygon2D::OccluderPolygon2D() {
  
  	occ_polygon = VS::get_singleton()->canvas_occluder_polygon_create();
  	closed = true;
  	cull = CULL_DISABLED;
  	rect_cache_dirty = true;
  }
  
  OccluderPolygon2D::~OccluderPolygon2D() {
  
  	VS::get_singleton()->free(occ_polygon);
  }
  
  void LightOccluder2D::_poly_changed() {
  
  #ifdef DEBUG_ENABLED
  	update();
  #endif
  }
  
  void LightOccluder2D::_notification(int p_what) {
  
  	if (p_what == NOTIFICATION_ENTER_CANVAS) {
  
  		VS::get_singleton()->canvas_light_occluder_attach_to_canvas(occluder, get_canvas());
  		VS::get_singleton()->canvas_light_occluder_set_transform(occluder, get_global_transform());
  		VS::get_singleton()->canvas_light_occluder_set_enabled(occluder, is_visible_in_tree());
  	}
  	if (p_what == NOTIFICATION_TRANSFORM_CHANGED) {
  
  		VS::get_singleton()->canvas_light_occluder_set_transform(occluder, get_global_transform());
  	}
  	if (p_what == NOTIFICATION_VISIBILITY_CHANGED) {
  
  		VS::get_singleton()->canvas_light_occluder_set_enabled(occluder, is_visible_in_tree());
  	}
  
  	if (p_what == NOTIFICATION_DRAW) {
  
  		if (Engine::get_singleton()->is_editor_hint()) {
  
  			if (occluder_polygon.is_valid()) {
  
  				Vector<Vector2> poly = occluder_polygon->get_polygon();
  
  				if (poly.size()) {
  					if (occluder_polygon->is_closed()) {
  						Vector<Color> color;
  						color.push_back(Color(0, 0, 0, 0.6));
  						draw_polygon(Variant(poly), color);
  					} else {
  
  						int ps = poly.size();
  						const Vector2 *r = poly.ptr();
  						for (int i = 0; i < ps - 1; i++) {
  
  							draw_line(r[i], r[i + 1], Color(0, 0, 0, 0.6), 3);
  						}
  					}
  				}
  			}
  		}
  	}
  
  	if (p_what == NOTIFICATION_EXIT_CANVAS) {
  
  		VS::get_singleton()->canvas_light_occluder_attach_to_canvas(occluder, RID());
  	}
  }
  
  #ifdef TOOLS_ENABLED
  Rect2 LightOccluder2D::_edit_get_rect() const {
  
  	return occluder_polygon.is_valid() ? occluder_polygon->_edit_get_rect() : Rect2();
  }
  
  bool LightOccluder2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {
  
  	return occluder_polygon.is_valid() ? occluder_polygon->_edit_is_selected_on_click(p_point, p_tolerance) : false;
  }
  #endif
  
  void LightOccluder2D::set_occluder_polygon(const Ref<OccluderPolygon2D> &p_polygon) {
  
  #ifdef DEBUG_ENABLED
  	if (occluder_polygon.is_valid())
  		occluder_polygon->disconnect("changed", callable_mp(this, &LightOccluder2D::_poly_changed));
  #endif
  	occluder_polygon = p_polygon;
  
  	if (occluder_polygon.is_valid())
  		VS::get_singleton()->canvas_light_occluder_set_polygon(occluder, occluder_polygon->get_rid());
  	else
  		VS::get_singleton()->canvas_light_occluder_set_polygon(occluder, RID());
  
  #ifdef DEBUG_ENABLED
  	if (occluder_polygon.is_valid())
  		occluder_polygon->connect("changed", callable_mp(this, &LightOccluder2D::_poly_changed));
  	update();
  #endif
  }
  
  Ref<OccluderPolygon2D> LightOccluder2D::get_occluder_polygon() const {
  
  	return occluder_polygon;
  }
  
  void LightOccluder2D::set_occluder_light_mask(int p_mask) {
  
  	mask = p_mask;
  	VS::get_singleton()->canvas_light_occluder_set_light_mask(occluder, mask);
  }
  
  int LightOccluder2D::get_occluder_light_mask() const {
  
  	return mask;
  }
  
  String LightOccluder2D::get_configuration_warning() const {
  
  	if (!occluder_polygon.is_valid()) {
  		return TTR("An occluder polygon must be set (or drawn) for this occluder to take effect.");
  	}
  
  	if (occluder_polygon.is_valid() && occluder_polygon->get_polygon().size() == 0) {
  		return TTR("The occluder polygon for this occluder is empty. Please draw a polygon.");
  	}
  
  	return String();
  }
  
  void LightOccluder2D::_bind_methods() {
  
  	ClassDB::bind_method(D_METHOD("set_occluder_polygon", "polygon"), &LightOccluder2D::set_occluder_polygon);
  	ClassDB::bind_method(D_METHOD("get_occluder_polygon"), &LightOccluder2D::get_occluder_polygon);
  
  	ClassDB::bind_method(D_METHOD("set_occluder_light_mask", "mask"), &LightOccluder2D::set_occluder_light_mask);
  	ClassDB::bind_method(D_METHOD("get_occluder_light_mask"), &LightOccluder2D::get_occluder_light_mask);
  
  	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "occluder", PROPERTY_HINT_RESOURCE_TYPE, "OccluderPolygon2D"), "set_occluder_polygon", "get_occluder_polygon");
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "light_mask", PROPERTY_HINT_LAYERS_2D_RENDER), "set_occluder_light_mask", "get_occluder_light_mask");
  }
  
  LightOccluder2D::LightOccluder2D() {
  
  	occluder = VS::get_singleton()->canvas_light_occluder_create();
  	mask = 1;
  	set_notify_transform(true);
  }
  
  LightOccluder2D::~LightOccluder2D() {
  
  	VS::get_singleton()->free(occluder);
  }
  