﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Box2D.Collision.Shapes;
using Box2D.Common;
using Box2D.Dynamics;
using Box2D.Dynamics.Joints;

namespace Box2D.TestBed.Tests
{
    public class Chain : Test
    {
        public Chain()
        {
            b2Body ground = null;
            {
                b2BodyDef bd  = new b2BodyDef();
                ground = m_world.CreateBody(bd);

                b2EdgeShape shape = new b2EdgeShape();
                shape.Set(new b2Vec2(-40.0f, 0.0f), new b2Vec2(40.0f, 0.0f));
                ground.CreateFixture(shape, 0.0f);
            }

            {
                b2PolygonShape shape = new b2PolygonShape();
                shape.SetAsBox(0.6f, 0.125f);

                b2FixtureDef fd = new b2FixtureDef();
                fd.shape = shape;
                fd.density = 20.0f;
                fd.friction = 0.2f;

                b2RevoluteJointDef jd = new b2RevoluteJointDef();
                jd.CollideConnected = false;

                const float y = 25.0f;
                b2Body prevBody = ground;
                for (int i = 0; i < 30; ++i)
                {
                    b2BodyDef bd  = new b2BodyDef();
                    bd.type = b2BodyType.b2_dynamicBody;
                    bd.position.Set(0.5f + i, y);
                    b2Body body = m_world.CreateBody(bd);
                    body.CreateFixture(fd);

                    b2Vec2 anchor = new b2Vec2(i, y);
                    jd.Initialize(prevBody, body, anchor);
                    m_world.CreateJoint(jd);

                    prevBody = body;
                }
            }
        }
    }
}
