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sprite.ml
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sprite.ml
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open Actors
type xy = float * float
type sprite_params =
{
max_frames: int;
max_ticks: int;
img_src: string;
frame_size: xy;
src_offset: xy;
bbox_offset: xy;
bbox_size: xy;
loop: bool;
}
type sprite =
{
mutable params: sprite_params;
context: Dom_html.canvasRenderingContext2D Js.t;
frame: int ref;
ticks: int ref;
mutable img: Dom_html.imageElement Js.t;
}
(*setup_sprite is used to initialize a sprite.*)
let setup_sprite ?loop:(loop=true) ?bb_off:(bbox_offset=(0.,0.))
?bb_sz:(bbox_size=(0.,0.))
img_src max_frames max_ticks frame_size src_offset =
let bbox_size = if bbox_size = (0.,0.) then frame_size else bbox_size in
let img_src = "./sprites/" ^ img_src in
{
img_src;
max_frames;
max_ticks;
frame_size;
src_offset;
bbox_offset;
bbox_size;
loop;
}
(*The following functions are used in order to define sprite animations
*from their sprite sheets. Also creates bounding boxes if necessary.*)
(*Sets sprite for small mario.*)
let make_small_player (typ, dir) =
match dir with
(* 16x16 grid with 0x0 offset*)
| Left -> begin match typ with
| Standing -> setup_sprite "mario-small.png" ~bb_off:(3.,1.) ~bb_sz:(11.,15.) 1 0 (16.,16.) (0.,0.)
| Jumping -> setup_sprite "mario-small.png" ~bb_off:(2.,1.) ~bb_sz:(13.,15.) 2 10 (16.,16.) (16.,16.)
| Running -> setup_sprite "mario-small.png" ~bb_off:(2.,1.) ~bb_sz:(12.,15.) 3 5 (16.,16.) (16.,0.)
| Crouching -> setup_sprite "mario-small.png" ~bb_off:(1.,5.) ~bb_sz:(14.,10.) 1 0 (16.,16.) (0.,64.)
end
| Right -> begin match typ with
| Standing -> setup_sprite "mario-small.png" ~bb_off:(1.,1.) ~bb_sz:(11.,15.) 1 0 (16.,16.) (0.,32.)
| Jumping -> setup_sprite "mario-small.png" ~bb_off:(2.,1.) ~bb_sz:(13.,15.) 2 10 (16.,16.) (16.,48.)
| Running -> setup_sprite "mario-small.png" ~bb_off:(2.,1.) ~bb_sz:(12.,15.) 3 5 (16.,16.) (16.,32.)
| Crouching -> setup_sprite "mario-small.png" ~bb_off:(1.,5.) ~bb_sz:(14.,10.) 1 0 (16.,16.) (0.,64.)
end
(*Sets sprite for big mario.*)
let make_big_player (typ, dir) =
match dir with
| Left -> begin match typ with
| Standing -> setup_sprite "mario-big.png" 1 0 ~bb_off:(2.,1.) ~bb_sz:(13.,25.) (16.,27.) (16.,5.)
| Jumping -> setup_sprite "mario-big.png" 1 0 ~bb_off:(2.,1.) ~bb_sz:(12.,25.) (16.,26.) (48.,6.)
| Running -> setup_sprite "mario-big.png" 4 10 ~bb_off:(2.,1.) ~bb_sz:(13.,25.) (16.,27.)(0.,37.)
| Crouching -> setup_sprite "mario-big.png" 1 0 ~bb_off:(2.,10.) ~bb_sz:(13.,17.) (16.,27.) (32.,5.)
end
| Right -> begin match typ with
| Standing -> setup_sprite "mario-big.png" 1 0 ~bb_off:(1.,1.) ~bb_sz:(13.,25.) (16.,26.) (16.,69.)
| Jumping -> setup_sprite "mario-big.png" 1 0 ~bb_off:(2.,1.) ~bb_sz:(12.,25.) (16.,26.) (48.,70.)
| Running -> setup_sprite "mario-big.png" 4 10 ~bb_off:(2.,1.) ~bb_sz:(13.,25.) (16.,27.) (0.,101.)
| Crouching -> setup_sprite "mario-big.png" 1 0 ~bb_off:(2.,10.) ~bb_sz:(13.,17.) (16.,27.) (32.,69.)
end
(*Sets sprites for enemies: Goomba, Red Koopa, Green Koopa.*)
let make_enemy (typ, dir) =
match (typ, dir) with
| (Goomba,_) -> setup_sprite "enemies.png" ~bb_off:(1.,1.) ~bb_sz:(14.,14.) 2 10 (16.,16.) (0.,128.)
| (GKoopa,Left) -> setup_sprite "enemies.png" ~bb_off:(4.,10.) ~bb_sz:(11.,16.) 2 10 (16.,27.) (0.,69.)
| (GKoopa,Right) -> setup_sprite "enemies.png" ~bb_off:(1.,10.) ~bb_sz:(11.,16.) 2 10 (16.,27.) (32.,69.)
| (RKoopa,Left) -> setup_sprite "enemies.png" ~bb_off:(4.,10.) ~bb_sz:(11.,16.) 2 10 (16.,27.) (0.,5.)
| (RKoopa,Right) -> setup_sprite "enemies.png" ~bb_off:(1.,10.) ~bb_sz:(11.,16.) 2 10 (16.,27.) (32.,5.)
| (GKoopaShell,_) -> setup_sprite "enemies.png" ~bb_off:(2.,2.) ~bb_sz:(12.,13.) 4 10 (16.,16.) (0.,96.)
| (RKoopaShell,_) -> setup_sprite "enemies.png" ~bb_off:(2.,2.) ~bb_sz:(12.,13.) 4 10 (16.,16.) (0.,32.)
(*Sets sprites for items: coin, fireflower, mushroom, star.*)
let make_item = function
(* 16x16 grid with 0x0 offset *)
| Coin -> setup_sprite "items.png" ~bb_off:(3.,0.) ~bb_sz:(12.,16.) 3 15 (16.,16.) (0.,80.)
| FireFlower -> setup_sprite "items.png" 1 0 (16.,16.) (0.,188.)
| Mushroom -> setup_sprite "items.png" ~bb_off:(2.,0.) ~bb_sz: (12.,16.) 1 0 (16.,16.) (0.,0.)
| Star -> setup_sprite "items.png" 1 0 (16.,16.) (16.,48.)
(*Sets sprites for blocks: brick, question block, unbreakable block, cloud block
* panel block, ground block.*)
let make_block = function
(* 16x16 grid with 0x0 offset *)
| Brick -> setup_sprite "blocks.png" 5 10 (16.,16.) (0.,0.)
| QBlock _ -> setup_sprite "blocks.png" 4 15 (16.,16.) (0.,16.)
| QBlockUsed -> setup_sprite "blocks.png" 1 0 (16.,16.) (0.,32.)
| UnBBlock -> setup_sprite "blocks.png" 1 0 (16.,16.) (0.,48.)
| Cloud -> setup_sprite "blocks.png" 1 0 (16., 16.) (0., 64.)
| Panel -> setup_sprite "panel.png" 3 15 (26., 26.) (0., 0.)
| Ground -> setup_sprite "ground.png" 1 0 (16., 16.) (0., 32.)
(*Sets sprites for particles, squished goomba, brick chunks (upon destruction
* of brick), score text.*)
let make_particle = function
| GoombaSquish -> setup_sprite "enemies.png" 1 0 (16.,16.) (0.,144.)
| BrickChunkL -> setup_sprite "chunks.png" 1 0 (8.,8.) (0.,0.)
| BrickChunkR -> setup_sprite "chunks.png" 1 0 (8.,8.) (8.,0.)
| Score100 -> setup_sprite "score.png" 1 0 (12.,8.) (0.,0.)
| Score200 -> setup_sprite "score.png" 1 0 (12.,9.) (0.,9.)
| Score400 -> setup_sprite "score.png" 1 0 (12.,9.) (0.,18.)
| Score800 -> setup_sprite "score.png" 1 0 (12.,9.) (0.,27.)
| Score1000 -> setup_sprite "score.png" 1 0 (14.,9.) (13.,0.)
| Score2000 -> setup_sprite "score.png" 1 0 (14.,9.) (13.,9.)
| Score4000 -> setup_sprite "score.png" 1 0 (14.,9.) (13.,18.)
| Score8000 -> setup_sprite "score.png" 1 0 (14.,9.) (13.,27.)
(*Calls to set sprite for either big or small mario.*)
let make_player pt spr_type =
match pt with
| BigM -> make_big_player spr_type
| SmallM -> make_small_player spr_type
(*Calls to set sprites for each type of object.*)
let make_type typ (dir : Actors.dir_1d) =
match typ with
| SPlayer(pt,st) -> make_player pt (st,dir)
| SEnemy t -> make_enemy (t,dir)
| SItem t -> make_item t
| SBlock t -> make_block t
(* Makes a sprite from provided [params]. *)
let make_from_params params context =
let img = (Dom_html.createImg Dom_html.document) in
img##src <- (Js.string params.img_src) ;
{
params;
context;
img;
frame = ref 0;
ticks = ref 0;
}
(*Make is the wrapper function to cycle through sprite animations*)
let make spawn dir context =
let params = make_type spawn dir in
make_from_params params context
(* Make a background *)
let make_bgd context =
let params = setup_sprite "bgd-1.png" 1 0 (512.,256.) (0.,0.) in
make_from_params params context
(* Make a particle from the given particle type *)
let make_particle ptyp context =
let params = make_particle ptyp in
make_from_params params context
(*Transform_enemy is used in order to switch the direction an enemy faces.*)
let transform_enemy enemy_typ spr dir =
let params = make_enemy (enemy_typ,dir) in
let img = (Dom_html.createImg Dom_html.document) in
img##src <- (Js.string params.img_src) ;
spr.params <- params;
spr.img <- img
(*update_animation is the main method to cycle through sprite animations*)
let update_animation (spr: sprite) =
(* Only advance frame when ticked *)
let curr_ticks = !(spr.ticks) in
if curr_ticks >= spr.params.max_ticks then begin
spr.ticks := 0;
if spr.params.loop then
spr.frame := (!(spr.frame) + 1) mod spr.params.max_frames
end else spr.ticks := curr_ticks + 1