/*************************************************************************/
/*  camera_2d.h                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
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/* "Software"), to deal in the Software without restriction, including   */
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/*************************************************************************/
#ifndef CAMERA_2D_H
#define CAMERA_2D_H

#include "scene/2d/node_2d.h"
#include "scene/main/viewport.h"

class Camera2D : public Node2D {

	OBJ_TYPE(Camera2D, Node2D);

public:
	enum AnchorMode {
		ANCHOR_MODE_FIXED_TOP_LEFT,
		ANCHOR_MODE_DRAG_CENTER
	};

protected:
	Point2 camera_pos;
	Point2 smoothed_camera_pos;
	bool first;

	ObjectID custom_viewport_id; // to check validity
	Viewport *custom_viewport;
	Viewport *viewport;

	StringName group_name;
	StringName canvas_group_name;
	RID canvas;
	Vector2 offset;
	Vector2 zoom;
	AnchorMode anchor_mode;
	bool rotating;
	bool current;
	float smoothing;
	bool smoothing_enabled;
	int limit[4];
	float drag_margin[4];

	bool h_drag_enabled;
	bool v_drag_enabled;
	float h_ofs;
	float v_ofs;

	Point2 camera_screen_center;
	void _update_scroll();

	void _make_current(Object *p_which);
	void _set_current(bool p_current);

	void _set_old_smoothing(float p_enable);

protected:
	virtual Matrix32 get_camera_transform();
	void _notification(int p_what);
	static void _bind_methods();

public:
	void set_offset(const Vector2 &p_offset);
	Vector2 get_offset() const;

	void set_anchor_mode(AnchorMode p_anchor_mode);
	AnchorMode get_anchor_mode() const;

	void set_rotating(bool p_rotating);
	bool is_rotating() const;

	void set_limit(Margin p_margin, int p_limit);
	int get_limit(Margin p_margin) const;

	void set_h_drag_enabled(bool p_enabled);
	bool is_h_drag_enabled() const;

	void set_v_drag_enabled(bool p_enabled);
	bool is_v_drag_enabled() const;

	void set_drag_margin(Margin p_margin, float p_drag_margin);
	float get_drag_margin(Margin p_margin) const;

	void set_v_offset(float p_offset);
	float get_v_offset() const;

	void set_h_offset(float p_offset);
	float get_h_offset() const;

	void set_enable_follow_smoothing(bool p_enabled);
	bool is_follow_smoothing_enabled() const;

	void set_follow_smoothing(float p_speed);
	float get_follow_smoothing() const;

	void make_current();
	void clear_current();
	bool is_current() const;

	void set_zoom(const Vector2 &p_zoom);
	Vector2 get_zoom() const;

	Point2 get_camera_screen_center() const;

	void set_custom_viewport(Node *p_viewport);
	Node *get_custom_viewport() const;

	Vector2 get_camera_pos() const;
	void force_update_scroll();
	void reset_smoothing();
	void align();

	Camera2D();
};

VARIANT_ENUM_CAST(Camera2D::AnchorMode);

#endif // CAMERA_2D_H