godot/scene/2d/joints_2d.h

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/*  joints_2d.h                                                          */
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#ifndef JOINTS_2D_H
#define JOINTS_2D_H

#include "node_2d.h"

class PhysicsBody2D;

class Joint2D : public Node2D {
	GDCLASS(Joint2D, Node2D);

	RID joint;
	RID ba, bb;

	NodePath a;
	NodePath b;
	real_t bias = 0.0;

	bool exclude_from_collision = true;
	bool configured = false;
	String warning;

protected:
	void _disconnect_signals();
	void _body_exit_tree(const ObjectID &p_body_id);
	void _update_joint(bool p_only_free = false);

	void _notification(int p_what);
	virtual void _configure_joint(RID p_joint, PhysicsBody2D *body_a, PhysicsBody2D *body_b) = 0;

	static void _bind_methods();

	_FORCE_INLINE_ bool is_configured() const { return configured; }

public:
	virtual String get_configuration_warning() const override;

	void set_node_a(const NodePath &p_node_a);
	NodePath get_node_a() const;

	void set_node_b(const NodePath &p_node_b);
	NodePath get_node_b() const;

	void set_bias(real_t p_bias);
	real_t get_bias() const;

	void set_exclude_nodes_from_collision(bool p_enable);
	bool get_exclude_nodes_from_collision() const;

	RID get_joint() const { return joint; }
	Joint2D();
	~Joint2D();
};

class PinJoint2D : public Joint2D {
	GDCLASS(PinJoint2D, Joint2D);

	real_t softness = 0.0;

protected:
	void _notification(int p_what);
	virtual void _configure_joint(RID p_joint, PhysicsBody2D *body_a, PhysicsBody2D *body_b) override;
	static void _bind_methods();

public:
	void set_softness(real_t p_softness);
	real_t get_softness() const;

	PinJoint2D();
};

class GrooveJoint2D : public Joint2D {
	GDCLASS(GrooveJoint2D, Joint2D);

	real_t length = 50.0;
	real_t initial_offset = 25.0;

protected:
	void _notification(int p_what);
	virtual void _configure_joint(RID p_joint, PhysicsBody2D *body_a, PhysicsBody2D *body_b) override;
	static void _bind_methods();

public:
	void set_length(real_t p_length);
	real_t get_length() const;

	void set_initial_offset(real_t p_initial_offset);
	real_t get_initial_offset() const;

	GrooveJoint2D();
};

class DampedSpringJoint2D : public Joint2D {
	GDCLASS(DampedSpringJoint2D, Joint2D);

	real_t stiffness = 20.0;
	real_t damping = 1.0;
	real_t rest_length = 0.0;
	real_t length = 50.0;

protected:
	void _notification(int p_what);
	virtual void _configure_joint(RID p_joint, PhysicsBody2D *body_a, PhysicsBody2D *body_b) override;
	static void _bind_methods();

public:
	void set_length(real_t p_length);
	real_t get_length() const;

	void set_rest_length(real_t p_rest_length);
	real_t get_rest_length() const;

	void set_damping(real_t p_damping);
	real_t get_damping() const;

	void set_stiffness(real_t p_stiffness);
	real_t get_stiffness() const;

	DampedSpringJoint2D();
};

#endif // JOINTS_2D_H