godot/servers/physics_2d/joints_2d_sw.h

/*************************************************************************/
/*  joints_2d_sw.h                                                       */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
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#ifndef JOINTS_2D_SW_H
#define JOINTS_2D_SW_H

#include "constraint_2d_sw.h"
#include "body_2d_sw.h"



class Joint2DSW : public Constraint2DSW {

	real_t max_force;
	real_t bias;
	real_t max_bias;
public:

	_FORCE_INLINE_ void set_max_force(real_t p_force) { max_force=p_force; }
	_FORCE_INLINE_ real_t get_max_force() const { return max_force; }

	_FORCE_INLINE_ void set_bias(real_t p_bias) { bias=p_bias; }
	_FORCE_INLINE_ real_t get_bias() const { return bias; }

	_FORCE_INLINE_ void set_max_bias(real_t p_bias) { max_bias=p_bias; }
	_FORCE_INLINE_ real_t get_max_bias() const { return max_bias; }

	virtual Physics2DServer::JointType get_type() const=0;
	Joint2DSW(Body2DSW **p_body_ptr=NULL,int p_body_count=0) : Constraint2DSW(p_body_ptr,p_body_count) { bias=0; max_force=max_bias=3.40282e+38; };

};
#if 0

class PinJoint2DSW : public Joint2DSW {

	union {
		struct {
			Body2DSW *A;
			Body2DSW *B;
		};

		Body2DSW *_arr[2];
	};

	Vector2 anchor_A;
	Vector2 anchor_B;
	real_t dist;
	real_t jn_acc;
	real_t jn_max;
	real_t max_distance;
	real_t mass_normal;
	real_t bias;

	Vector2 rA,rB;
	Vector2 n; //normal
	bool correct;


public:

	virtual Physics2DServer::JointType get_type() const { return Physics2DServer::JOINT_PIN; }

	virtual bool setup(float p_step);
	virtual void solve(float p_step);


	PinJoint2DSW(const Vector2& p_pos,Body2DSW* p_body_a,Body2DSW* p_body_b=NULL);
	~PinJoint2DSW();
};

#else

class PinJoint2DSW : public Joint2DSW {

	union {
		struct {
			Body2DSW *A;
			Body2DSW *B;
		};

		Body2DSW *_arr[2];
	};

	Matrix32 M;
	Vector2 rA,rB;
	Vector2 anchor_A;
	Vector2 anchor_B;
	Vector2 bias;
	Vector2 P;
	real_t softness;

public:

	virtual Physics2DServer::JointType get_type() const { return Physics2DServer::JOINT_PIN; }

	virtual bool setup(float p_step);
	virtual void solve(float p_step);


	PinJoint2DSW(const Vector2& p_pos,Body2DSW* p_body_a,Body2DSW* p_body_b=NULL);
	~PinJoint2DSW();
};


#endif
class GrooveJoint2DSW : public Joint2DSW {

	union {
		struct {
			Body2DSW *A;
			Body2DSW *B;
		};

		Body2DSW *_arr[2];
	};

	Vector2 A_groove_1;
	Vector2 A_groove_2;
	Vector2 A_groove_normal;
	Vector2 B_anchor;
	Vector2 jn_acc;
	Vector2 gbias;
	real_t jn_max;
	real_t clamp;
	Vector2 xf_normal;
	Vector2 rA,rB;
	Vector2 k1,k2;


	bool correct;

public:

	virtual Physics2DServer::JointType get_type() const { return Physics2DServer::JOINT_GROOVE; }

	virtual bool setup(float p_step);
	virtual void solve(float p_step);


	GrooveJoint2DSW(const Vector2& p_a_groove1,const Vector2& p_a_groove2, const Vector2& p_b_anchor, Body2DSW* p_body_a,Body2DSW* p_body_b);
	~GrooveJoint2DSW();
};


class DampedSpringJoint2DSW : public Joint2DSW {

	union {
		struct {
			Body2DSW *A;
			Body2DSW *B;
		};

		Body2DSW *_arr[2];
	};


	Vector2 anchor_A;
	Vector2 anchor_B;

	real_t rest_length;
	real_t damping;
	real_t stiffness;

	Vector2 rA,rB;
	Vector2 n;
	real_t n_mass;
	real_t target_vrn;
	real_t v_coef;

public:

	virtual Physics2DServer::JointType get_type() const { return Physics2DServer::JOINT_DAMPED_SPRING; }

	virtual bool setup(float p_step);
	virtual void solve(float p_step);

	void set_param(Physics2DServer::DampedStringParam p_param, real_t p_value);
	real_t get_param(Physics2DServer::DampedStringParam p_param) const;

	DampedSpringJoint2DSW(const Vector2& p_anchor_a,const Vector2& p_anchor_b, Body2DSW* p_body_a,Body2DSW* p_body_b);
	~DampedSpringJoint2DSW();
};


#endif // JOINTS_2D_SW_H