source: trunk/orbital/snake.h @ 1372 Tweet

//
// Orbital
//
// Copyright: (c) 2012 Various People
//

/* FIXME: this file is pure crap; it's only a test. */

#if !defined __SNAKE_H__
#define __SNAKE_H__

class Snake : public WorldEntity
{
public:
    Snake(int nodes)
      : m_steer(0.f),
        m_ready(false)
    {
        m_head.SendCommand("sc1,1,1,1,afcb10,10,10,1,sc.9,.6,.1,1,afcb30,3,3,.8,fl");
        m_head.SendCommand("sc1,1,1,1,afcb.4,.4,12,.4,tz3,tx8,mx,fl");
        m_head.SendCommand("sc1,1,1,1,afcb.4,.4,12,.4,tz3,tx12,mx,fl");
        m_head.SendCommand("sc.4,.6,.8,.6,afcb5,8,8,1,ty3,tz3,fl");

        m_body.SendCommand("sc1,1,1,1,afcb6,6,12,1,sc.9,.6,.1,1,afcb3,20,3,.8,afcb20,3,3,.8,fl");
        m_body.SendCommand("sc1,1,1,1,afcb.4,.4,7,.4,ty8,my,fl");
        m_body.SendCommand("sc1,1,1,1,afcb.4,.4,7,.4,tx8,mx,fl");

        m_tail.SendCommand("sc1,1,1,1,afcb6,6,10,1,tz-1,fl");
        m_tail.SendCommand("sc.9,.6,.1,1,afcb3,15,3,.8,ty8,fl");
        m_tail.SendCommand("sc1,1,1,1,afcb.4,.4,8,.4,tz-1,ty8,fl");
        m_tail.SendCommand("sc1,1,1,1,afcb.4,.4,8,.4,tz-1,ty12,fl");
        m_tail.SendCommand("sc.9,.6,.1,1,afcb15,3,3,.8,tx8,fl");
        m_tail.SendCommand("sc1,1,1,1,afcb.4,.4,8,.4,tz-1,tx8,fl");
        m_tail.SendCommand("sc1,1,1,1,afcb.4,.4,8,.4,tz-1,tx12,fl");

        m_position = vec3(RandF(0.f, 100.f), 20.f, RandF(150.f, 250.f));
        m_rotation = quat::rotate(RandF(30.f, 70.f), 0.f, 1.f, 0.f);;

        /* The last node is actually the tail */
        for (int i = 0; i < nodes; i++)
            m_nodes.Push(m_rotation.transform(vec3(-12.f, 0.f, 0.f)), 0.f);
        m_nodes.Push(vec3(0.f, 0.f, 0.f), 45.f);
    }

    ~Snake()
    {
    }

    char const *GetName() { return "<snake>"; }

protected:
    virtual void TickGame(float seconds)
    {
        WorldEntity::TickGame(seconds);

        m_steer += 2.f * seconds;

        /* Destruction test */
        if (m_nodes.Count() >= 3 && m_steer > 30
             && (int)m_steer / 6 != (int)(m_steer - 2.f * seconds) / 6)
        {
            int todelete = (int)RandF(m_nodes.Count() - 2);
            m_nodes[todelete + 1].m1 += m_nodes[todelete].m1;
            m_nodes.Remove(todelete);
            m_nodes[todelete + 1].m1 += m_nodes[todelete].m1;
            m_nodes.Remove(todelete);
        }

        float test = sinf(m_steer) * 100.f + 30.f;
        m_rotation *= quat::rotate(seconds * test, vec3(0, 1, 0));

        m_velocity = 60.f * m_rotation.transform(vec3(0, 0, 1));
        vec3 deltapos = seconds * m_velocity;
        m_position += deltapos;

        for (int i = 0; i < m_nodes.Count(); i++)
        {
            /* The current node is dragged by the previous one */
            vec3 new_delta = m_nodes[i].m1 - deltapos;
            float new_distance = length(new_delta);
            if (new_distance > 12.f)
            {
                new_delta /= new_distance;
                new_distance = std::max(12.f, new_distance - seconds * 80.f);
                new_delta *= new_distance;
            }
            deltapos = new_delta + deltapos - m_nodes[i].m1;
            m_nodes[i].m1 = new_delta;

            /* If the current node is not the tail, rotate */
            if (i != m_nodes.Count() - 1)
                m_nodes[i].m2 += seconds * ((i & 1) ? 200.f : -200.f);
        }
    }

    virtual void TickDraw(float seconds)
    {
        WorldEntity::TickDraw(seconds);

        if (!m_ready)
        {
            m_head.SendCommand("irb");
            m_body.SendCommand("irb");
            m_tail.SendCommand("irb");
            m_ready = true;
        }

        vec3 pos = m_position;
        quat rot = m_rotation;
        float y_angle = 0.f;
        mat4 model = mat4::translate(pos) * mat4(rot);
        m_head.Render(model);

        for (int i = 0; i < m_nodes.Count(); i++)
        {
            pos += m_nodes[i].m1;
            y_angle = (180.f / M_PI) * atan2(m_nodes[i].m1.x, m_nodes[i].m1.z);
            rot = quat::rotate(y_angle, 0.f, 1.f, 0.f)
                * quat::rotate(m_nodes[i].m2, 0.f, 0.f, 1.f);
            model = mat4::translate(pos) * mat4(rot);
            if (i != m_nodes.Count() - 1)
                m_body.Render(model);
            else
                m_tail.Render(model);
        }
    }

private:
    Mesh m_head, m_body, m_tail;
    float m_steer;
    /* List of nodes (position, self-rotation angle) */
    Array<vec3, float> m_nodes;
    bool m_ready;
};

#endif /* __SNAKE_H__ */