godot/scene/resources/convex_polygon_shape_2d.cpp

/*************************************************************************/
/*  convex_polygon_shape_2d.cpp                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
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#include "convex_polygon_shape_2d.h"

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

void ConvexPolygonShape2D::_update_shape() {

	Physics2DServer::get_singleton()->shape_set_data(get_rid(),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() {

	ObjectTypeDB::bind_method(_MD("set_point_cloud","point_cloud"),&ConvexPolygonShape2D::set_point_cloud);
	ObjectTypeDB::bind_method(_MD("set_points","points"),&ConvexPolygonShape2D::set_points);
	ObjectTypeDB::bind_method(_MD("get_points"),&ConvexPolygonShape2D::get_points);



	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2_ARRAY,"points"),_SCS("set_points"),_SCS("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.pos=points[i];
		else
			rect.expand_to(points[i]);
	}

	return rect;

}

ConvexPolygonShape2D::ConvexPolygonShape2D() : Shape2D( Physics2DServer::get_singleton()->shape_create(Physics2DServer::SHAPE_CONVEX_POLYGON)) {


	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();
}