godot/scene/resources/convex_polygon_shape_2d.cpp

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/*  convex_polygon_shape_2d.cpp                                          */
/*************************************************************************/
/*                       This file is part of:                           */
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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#include "convex_polygon_shape_2d.h"

#include "core/math/geometry.h"
#include "servers/physics_2d_server.h"
#include "servers/visual_server.h"

bool ConvexPolygonShape2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {

	return Geometry::is_point_in_polygon(p_point, points);
}

void ConvexPolygonShape2D::_update_shape() {

	Vector<Vector2> final_points = points;
	if (Geometry::is_polygon_clockwise(final_points)) { //needs to be counter clockwise
		final_points.invert();
	}
	Physics2DServer::get_singleton()->shape_set_data(get_rid(), final_points);
	emit_changed();
}

void ConvexPolygonShape2D::set_point_cloud(const Vector<Vector2> &p_points) {

	Vector<Point2> hull = Geometry::convex_hull_2d(p_points);
	ERR_FAIL_COND(hull.size() < 3);
	set_points(hull);
}

void ConvexPolygonShape2D::set_points(const Vector<Vector2> &p_points) {

	points = p_points;

	_update_shape();
}

Vector<Vector2> ConvexPolygonShape2D::get_points() const {

	return points;
}

void ConvexPolygonShape2D::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_point_cloud", "point_cloud"), &ConvexPolygonShape2D::set_point_cloud);
	ClassDB::bind_method(D_METHOD("set_points", "points"), &ConvexPolygonShape2D::set_points);
	ClassDB::bind_method(D_METHOD("get_points"), &ConvexPolygonShape2D::get_points);

	ADD_PROPERTY(PropertyInfo(Variant::POOL_VECTOR2_ARRAY, "points"), "set_points", "get_points");
}

void ConvexPolygonShape2D::draw(const RID &p_to_rid, const Color &p_color) {

	Vector<Color> col;
	col.push_back(p_color);
	VisualServer::get_singleton()->canvas_item_add_polygon(p_to_rid, points, col);
}

Rect2 ConvexPolygonShape2D::get_rect() const {

	Rect2 rect;
	for (int i = 0; i < points.size(); i++) {
		if (i == 0)
			rect.position = points[i];
		else
			rect.expand_to(points[i]);
	}

	return rect;
}

ConvexPolygonShape2D::ConvexPolygonShape2D() :
		Shape2D(Physics2DServer::get_singleton()->convex_polygon_shape_create()) {

	int pcount = 3;
	for (int i = 0; i < pcount; i++)
		points.push_back(Vector2(Math::sin(i * Math_PI * 2 / pcount), -Math::cos(i * Math_PI * 2 / pcount)) * 10);

	_update_shape();
}