anim_manager.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef NUVIE_CORE_ANIM_MANAGER_H
#define NUVIE_CORE_ANIM_MANAGER_H

#include "ultima/nuvie/core/nuvie_defs.h"
#include "ultima/nuvie/gui/widgets/map_window.h"
#include "ultima/nuvie/core/timed_event.h"
#include "ultima/nuvie/misc/call_back.h"
#include "ultima/nuvie/misc/map_entity.h"
#include "ultima/nuvie/misc/u6_line_walker.h"

namespace Ultima {
namespace Nuvie {

class Actor;
class CallBack;
class AnimManager;
class NuvieAnim;
class Screen;
class Font;

#define MESG_TIMED CB_TIMED

typedef Common::List<NuvieAnim *>::iterator AnimIterator;

/* Each viewable area has it's own AnimManager. (but I can only think of
 * animations in the MapWindow using this, so that could very well change)
 */
class AnimManager {
    MapWindow *map_window;
    Screen *viewsurf;
    Common::Rect viewport; // clip anims to location
    Common::List<NuvieAnim *> anim_list; // in paint order
    uint32 next_id;

    uint8 tile_pitch;

    sint16 mapwindow_x_offset;
    sint16 mapwindow_y_offset;

    AnimIterator get_anim_iterator(uint32 anim_id);

public:
    AnimManager(sint16 x, sint16 y, Screen *screen = nullptr, Common::Rect *clipto = nullptr);
    ~AnimManager() {
        destroy_all();
    }

    void update();
    void display(bool top_anims = false);

    Screen *get_surface()            {
        return viewsurf;
    }
    void set_surface(Screen *screen) {
        viewsurf = screen;
    }
    void set_area(Common::Rect clipto)  {
        viewport = clipto;
    }
    void set_tile_pitch(uint8 p)     {
        tile_pitch = p;
    }
    uint8 get_tile_pitch() const {
        return tile_pitch;
    }

//new_anim(new ExplosiveAnim(speed));
    sint32 new_anim(NuvieAnim *new_anim);
    void destroy_all();
    bool destroy_anim(uint32 anim_id);
    bool destroy_anim(NuvieAnim *anim_pt);

    NuvieAnim *get_anim(uint32 anim_id);

    void drawTile(const Tile *tile, uint16 x, uint16 y);
    void drawTileAtWorldCoords(const Tile *tile, uint16 wx, uint16 wy, uint16 add_x = 0, uint16 add_y = 0);
    void drawText(Font *font, const char *text, uint16 x, uint16 y);
};


/* Contains methods to support management, continuous display, and movement of
 * animation across viewport.
 */
/* FIXME: The return of update() is not very useful. If an anim isn't
 * redrawn then it just disappears on next MapWindow::Display(). If you don't
 * want it to appear just delete it.*/
class NuvieAnim: public CallBack {
protected:
    friend class AnimManager;
    AnimManager *anim_manager; // set by anim_manager when adding to list

    uint32 id_n; // unique

    sint32 vel_x, vel_y; // movement across viewport (pixels/second; min=10)
    uint32 px, py; // location on surface
    uint32 last_move_time; // last time when update_position() moved (ticks)

    bool safe_to_delete; // can animmgr delete me?
    bool updated; // call display
    bool running;
    bool paused;
    bool top_anim; //animate on top of mapwindow.

    // return false if animation doesn't need redraw
    virtual bool update() {
        return true;
    }
    virtual void display() = 0;

    void update_position();

public:
    NuvieAnim();
    ~NuvieAnim() override;

    void pause() {
        paused = true;
    }
    void unpause() {
        paused = false;
    }
    bool is_paused() const {
        return paused;
    }

    virtual MapCoord get_location() {
        return MapCoord(px, py, 0);
    }
    uint32 get_id() const {
        return id_n;
    }

    void set_safe_to_delete(bool val)       {
        safe_to_delete = val;
    }
    void set_velocity(sint32 sx, sint32 sy) {
        vel_x = sx;
        vel_y = sy;
    }
    void set_velocity_for_speed(sint16 xdir, sint16 ydir, uint32 spd);

    virtual void stop()                     {
        updated = running = false;
    }
    virtual void start()                    { }
    uint16 message(uint16 msg, void *msg_data = nullptr, void *my_data = nullptr) {
        if (callback_target) return (CallBack::message(msg, msg_data, my_data));
        else return 0;
    }

    virtual void move(uint32 x, uint32 y, uint32 add_x = 0, uint32 add_y = 0)    {
        px = x;
        py = y;
    }
    virtual void shift(sint32 sx, sint32 sy) {
        px += sx;
        py += sy;
    }

//    void set_flags();
// ANIM_ONTOP
// ANIM_ONBOTTOM
};


/* Tile placement & data for TileAnim
 */
typedef struct {
    sint16 pos_x, pos_y; // map position relative to Anim tx,ty
    uint16 px, py; // pixel offset from pos_x,pos_y
    Tile *tile;
} PositionedTile;


/* Animation using game tiles
 */
class TileAnim : public NuvieAnim {
protected:
    MapWindow *_mapWindow;
    uint32 _tx, _ty, // location on surface: in increments of "tile_pitch"
           _px, _py; // location on surface: pixel offset from tx,ty

    Common::Array<PositionedTile *> _tiles;

    void display() override;

public:
    TileAnim();
    ~TileAnim() override;

    MapCoord get_location() override {
        return MapCoord(_tx, _ty, 0);
    }
    void get_offset(uint32 &x_add, uint32 &y_add) const {
        x_add = _px;
        y_add = _py;
    }
    sint32 get_tile_id(PositionedTile *find_tile);

    void move(uint32 x, uint32 y, uint32 add_x = 0, uint32 add_y = 0) override {
        _tx = x;
        _ty = y;
        _px = add_x;
        _py = add_y;
    }
    void shift(sint32 sx, sint32 sy) override;
    void shift_tile(uint32 ptile_num, sint32 sx, sint32 sy);
    void move_tile(PositionedTile *ptile, uint32 x, uint32 y);


    PositionedTile *add_tile(Tile *tile, sint16 x, sint16 y, uint16 add_x = 0, uint16 add_y = 0);
    void remove_tile(uint32 i = 0);
    void remove_tile(PositionedTile *p_tile);
};


/* TileAnim using a timed event.
 */
class TimedAnim: public TileAnim {
protected:
    TimedCallback *timer;
public:
    TimedAnim()  {
        timer = nullptr;
    }
    ~TimedAnim() override {
        stop_timer();
    }
    void start_timer(uint32 delay) {
        if (!timer) timer = new TimedCallback(this, nullptr, delay, true);
    }
    void stop_timer()              {
        if (timer) {
            timer->clear_target();
            timer = nullptr;
        }
    }

    void stop() override {
        stop_timer();
        NuvieAnim::stop();
    }
};


// OR these together to tell a TossAnim what to intercept
#define TOSS_TO_BLOCKING 0x01
#define TOSS_TO_ACTOR    0x02
#define TOSS_TO_OBJECT   0x04

/* A TileAnim that can intercept objects in the world. Start selected tile at
 * source, and move across viewport to target. The tile is rotated by the
 * degrees argument passed to the constructor.
 */
class TossAnim : public TileAnim {
protected:
    ActorManager *actor_manager;
    ObjManager *obj_manager;
    Map *map;

    MapCoord *src, *target;
    uint32 start_px, start_py, target_px, target_py;
    uint8 mapwindow_level; // level of map being viewed
    uint16 speed; // movement speed in pixels per second (X and Y speed can't be set independently)

    Tile *toss_tile;
    uint8 blocking; // stop_flags
    uint8 tile_center; // tile_pitch / 2
    float tanS; // Ydiff/Xdiff, between src and target (for movement velocity)
    sint16 old_relpos; // when moving diagonally, last relative position on minor axis
    float x_left, y_left; // when unable to move in a call, fractional movement values are collected here
    uint16 x_dist, y_dist; // distances from start->target on X-axis & Y-axis

    bool update() override;
    MapCoord get_location() override;

    void display() override;

public:
    TossAnim(const Tile *tile, const MapCoord &start, const MapCoord &stop, uint16 pixels_per_sec, uint8 stop_flags = 0);
    TossAnim(Obj *obj, uint16 degrees, const MapCoord &start, const MapCoord &stop, uint16 pixels_per_sec, uint8 stop_flags = 0);
    ~TossAnim() override;

    void init(const Tile *tile, uint16 degrees, const MapCoord &start, const MapCoord &stop, uint16 pixels_per_sec, uint8 stop_flags);
    void start() override;
    void stop() override;
    uint32 update_position(uint32 max_move = 0);
    inline void accumulate_moves(float moves, sint32 &x_move, sint32 &y_move, sint8 xdir, sint8 ydir);

    // Virtual functions are called when the tile hits something.
    virtual void hit_target();
    virtual void hit_object(Obj *obj);
    virtual void hit_actor(Actor *actor);
    virtual void hit_blocking(const MapCoord &obj_loc);
};

// This is for off-center tiles. The tile will be moved down by the
// shift amount if moving right, and up if moving left. (and rotated)
struct tossanim_tile_shifts_s {
    uint16 tile_num;
    sint8 shift; // plus or minus vertical position
};
extern const struct tossanim_tile_shifts_s tossanim_tile_shifts[];

/* a line of fire */
typedef struct {
    PositionedTile *tile; // last associated sprite
    MapCoord direction; // where the explosion sprites are going
    uint32 travelled; // distance this fire line has travelled
} ExplosiveAnimSegment;

/* SuperBomberman! Toss fireballs in multiple directions from source out.
 */
class ExplosiveAnim : public TimedAnim {
    MapCoord center;
    uint32 radius; // num. of spaces from center
    Common::Array<ExplosiveAnimSegment> flame; // lines of fire from the center
    uint16 exploding_tile_num; // fireball effect tile_num
    Common::Array<MapEntity> hit_items; // things the explosion has hit

public:
    ExplosiveAnim(const MapCoord &start, uint32 size);
    ~ExplosiveAnim() override;
    void start() override;
    uint16 callback(uint16 msg, CallBack *caller, void *data) override;
    bool update() override;
    bool already_hit(const MapEntity &ent);
    void hit_object(Obj *obj);
    void hit_actor(Actor *actor);
    void get_shifted_location(uint16 &x, uint16 &y, uint16 &px, uint16 &py,
                              uint32 sx, uint32 sy);
};

typedef struct {
    MapCoord target;
    U6LineWalker *lineWalker;
    PositionedTile *p_tile;
    uint8 update_idx;
    uint16 rotation;
    uint16 rotation_amount;
    float current_deg;
    bool isRunning;
} ProjectileLine;

class ProjectileAnim : public TileAnim {
    MapCoord src;
    Common::Array<ProjectileLine> line;
    uint16 tile_num; // fireball effect tile_num
    uint8 src_tile_y_offset; //amount to offset src_tile when rotating. Used by arrows and bolts
    Common::Array<MapEntity> hit_items; // things the projectile has hit
    uint16 stopped_count;
    uint8 speed; //number of pixels to move in a single update.

    bool leaveTrailFlag;
public:
    ProjectileAnim(uint16 tileNum, MapCoord *start, Common::Array<MapCoord> target, uint8 animSpeed, bool leaveTrailFlag = false, uint16 initialTileRotation = 0, uint16 rotationAmount = 0, uint8 src_y_offset = 0);
    ~ProjectileAnim() override;
    void start() override;

    bool update() override;

protected:
    void hit_entity(MapEntity entity);
    bool already_hit(const MapEntity &ent);

};

class WingAnim : public TileAnim {
    MapCoord target;
    sint32 x, y, finish_x;
    sint16 x_inc;
    Tile *wing_top[2];
    Tile *wing_bottom[2];

    PositionedTile *p_tile_top;
    PositionedTile *p_tile_bottom;

public:
    WingAnim(const MapCoord &target);
    ~WingAnim() override;
    void start() override;
    bool update() override;

};

typedef struct {
    uint16 x, y;
    PositionedTile *p_tile;
    uint8 length_left;
} Hailstone;

#define HAILSTORM_ANIM_MAX_STONES 6
class HailstormAnim : public TileAnim {
    MapCoord target;

    Tile *hailstone_tile;

    Hailstone hailstones[HAILSTORM_ANIM_MAX_STONES];
    uint8 num_hailstones_left;
    uint8 num_active;

public:
    HailstormAnim(const MapCoord &t);
    ~HailstormAnim() override;
    void start() override;
    bool update() override;

protected:
    sint8 find_free_hailstone();

};

/* Display hit effect over an actor or location for a certain duration.
 */
class HitAnim : public TimedAnim {
    Actor *hit_actor;

    bool update() override;

public:
    HitAnim(const MapCoord &loc);
    HitAnim(Actor *actor);

    uint16 callback(uint16 msg, CallBack *caller, void *msg_data) override;
    void start() override {
        start_timer(300);
    }
};

class TextAnim : public TimedAnim {
    Common::String text;
    Font *font;
    uint32 duration;

public:
    TextAnim(Common::String text, MapCoord loc, uint32 dur);
    ~TextAnim() override;
    uint16 callback(uint16 msg, CallBack *caller, void *msg_data) override;
    void start() override                    {
        start_timer(duration);
    }

    void display() override;
};

class TileFadeAnim : public TileAnim {
    uint16 pixel_count;
    Tile *anim_tile;
    Tile *to_tile;
    bool should_delete_to_tile;
    uint16 pixels_per_update; //the number of pixels to change in each update.
    unsigned char mask[256];

public:
    TileFadeAnim();
    TileFadeAnim(const MapCoord &loc, Tile *from, Tile *to, uint16 speed);
    TileFadeAnim(const MapCoord &loc, Tile *from, uint8 color_from, uint8 color_to, bool reverse, uint16 speed);
    ~TileFadeAnim() override;

    bool update() override;
protected:
    void init(uint16 speed);
};

} // End of namespace Nuvie
} // End of namespace Ultima

#endif