Body.h

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// Copyright © 2008-2021 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#ifndef _BODY_H
#define _BODY_H
 
#include "DeleteEmitter.h"
#include "FrameId.h"
#include "lua/PropertiedObject.h"
#include "matrix3x3.h"
#include "vector3.h"
#include <string>
 
class Space;
class Camera;
class Frame;
class SystemBody;
 
namespace Graphics {
    class Renderer;
}
struct CollisionContact;
 
// ObjectType is used as a form of RTTI for Body and its children.
// Think carefully before adding more entries; we'd like to switch
// to a composition-based system instead.
enum class ObjectType { // <enum name=PhysicsObjectType scope='ObjectType' public>
    // only creating enum strings for types that are exposed to Lua
    BODY,
    MODELBODY,
    DYNAMICBODY, // <enum skip>
    SHIP,
    PLAYER,
    SPACESTATION,
    TERRAINBODY, // <enum skip>
    PLANET,
    STAR,
    CARGOBODY,
    PROJECTILE, // <enum skip>
    MISSILE,
    HYPERSPACECLOUD // <enum skip>
};
 
#define OBJDEF(__thisClass, __parentClass, __TYPE)                             \
    virtual ObjectType GetType() const override { return ObjectType::__TYPE; } \
    virtual bool IsType(ObjectType c) const override                           \
    {                                                                          \
        if (__thisClass::GetType() == (c))                                     \
            return true;                                                       \
        else                                                                   \
            return __parentClass::IsType(c);                                   \
    }
 
class Body : public DeleteEmitter, public PropertiedObject {
public:
    virtual ObjectType GetType() const { return ObjectType::BODY; }
    virtual bool IsType(ObjectType c) const { return GetType() == c; }
 
    Body();
    Body(const Json &jsonObj, Space *space);
    virtual ~Body();
    void ToJson(Json &jsonObj, Space *space);
    static Body *FromJson(const Json &jsonObj, Space *space);
    virtual void PostLoadFixup(Space *space){};
 
    virtual void SetPosition(const vector3d &p) { m_pos = p; }
    vector3d GetPosition() const { return m_pos; }
    virtual void SetOrient(const matrix3x3d &r) { m_orient = r; }
    const matrix3x3d &GetOrient() const { return m_orient; }
    virtual void SetVelocity(const vector3d &v) { assert(0); }
    virtual vector3d GetVelocity() const { return vector3d(0.0); }
 
    void SetPhysRadius(double r) { m_physRadius = r; }
    double GetPhysRadius() const { return m_physRadius; }
    void SetClipRadius(double r) { m_clipRadius = r; }
    double GetClipRadius() const { return m_clipRadius; }
    virtual double GetMass() const
    {
        assert(0);
        return 0;
    }
 
    // return true if to do collision response and apply damage
    virtual bool OnCollision(Body *o, Uint32 flags, double relVel) { return false; }
    // Attacker may be null
    virtual bool OnDamage(Body *attacker, float kgDamage, const CollisionContact &contactData) { return false; }
    // Override to clear any pointers you hold to the body
    virtual void NotifyRemoved(const Body *const removedBody) {}
 
    // before all bodies have had TimeStepUpdate (their moving step),
    // StaticUpdate() is called. Good for special collision testing (Projectiles)
    // as you can't test for collisions if different objects are on different 'steps'
    virtual void StaticUpdate(const float timeStep) {}
    virtual void TimeStepUpdate(const float timeStep) {}
    virtual void Render(Graphics::Renderer *r, const Camera *camera, const vector3d &viewCoords, const matrix4x4d &viewTransform) = 0;
 
    virtual void SetFrame(FrameId f) { m_frame = f; }
    FrameId GetFrame() const { return m_frame; }
    void SwitchToFrame(FrameId newFrame);
    void UpdateFrame(); // check for frame switching
 
    vector3d GetVelocityRelTo(const Body *) const;
    vector3d GetVelocityRelTo(FrameId) const;
    vector3d GetPositionRelTo(FrameId) const;
    vector3d GetPositionRelTo(const Body *) const;
    matrix3x3d GetOrientRelTo(FrameId) const;
 
    // Should return pointer in Pi::currentSystem
    virtual const SystemBody *GetSystemBody() const { return nullptr; }
    // for putting on planet surface, oriented +y up
    void OrientOnSurface(double radius, double latitude, double longitude);
 
    virtual void SetLabel(const std::string &label);
    const std::string &GetLabel() const { return m_label; }
 
    unsigned int GetFlags() const { return m_flags; }
    // TODO(sturnclaw) use this sparingly, the flags interface is rather fragile and needs work
    void SetFlag(unsigned int flag, bool enable)
    {
        if (enable)
            m_flags |= flag;
        else
            m_flags &= ~flag;
    }
 
    // Only Space::KillBody() should call this method.
    void MarkDead() { m_dead = true; }
    bool IsDead() const { return m_dead; }
 
    // all Bodies are in space... except where they're not (Ships hidden in hyperspace clouds)
    virtual bool IsInSpace() const { return true; }
 
    // Interpolated between physics ticks.
    const matrix3x3d &GetInterpOrient() const { return m_interpOrient; }
    vector3d GetInterpPosition() const { return m_interpPos; }
    vector3d GetInterpPositionRelTo(FrameId relToId) const;
    vector3d GetInterpPositionRelTo(const Body *relTo) const;
    matrix3x3d GetInterpOrientRelTo(FrameId relToId) const;
 
    // should set m_interpolatedTransform to the smoothly interpolated value
    // (interpolated by 0 <= alpha <=1) between the previous and current physics tick
    virtual void UpdateInterpTransform(double alpha)
    {
        m_interpOrient = GetOrient();
        m_interpPos = GetPosition();
    }
 
    // TODO: abstract this functionality into a component of some fashion
    // Return the position in body-local coordinates where the target indicator should be displayed.
    // Usually equal to the center of the body == vector3d(0, 0, 0)
    virtual vector3d GetTargetIndicatorPosition() const;
 
    enum {
        FLAG_CAN_MOVE_FRAME = (1 << 0),
        FLAG_LABEL_HIDDEN = (1 << 1),
        FLAG_DRAW_LAST = (1 << 2),   // causes the body drawn after other bodies in the z-sort
        FLAG_DRAW_EXCLUDE = (1 << 3) // do not draw this body, intended for e.g. when camera is inside
    };
 
protected:
    virtual void SaveToJson(Json &jsonObj, Space *space);
    unsigned int m_flags;
 
    // Interpolated draw orientation-position
    vector3d m_interpPos;
    matrix3x3d m_interpOrient;
 
private:
    vector3d m_pos;
    matrix3x3d m_orient;
    FrameId m_frame; // frame of reference
    std::string m_label;
    bool m_dead; // Checked in destructor to make sure body has been marked dead.
    double m_clipRadius;
    double m_physRadius;
};
 
#endif /* _BODY_H */