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(* Planets: A simple 2-d celestial simulator
Copyright (C) 2001-2003 Yaron M. Minsky
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
open StdLabels
open MoreLabels
open Tk
open Printf
open State
open Common
open Constants
let gap_ms = Options.named_live_value "gap_ms" 30
(* period, in ms, between callbacks.
30ms corresponds to roughly 33 frames/sec *)
let iterations = Options.named_live_value "iterations" (gap_ms#v / 15)
(* # iterations per callback *)
let init_screen_width = 500
let init_screen_height = 500
let diameter_multiplier = Options.named_live_value "diameter_multiplier" 1.0
let random_vel_multiplier = Options.named_live_value "random_vel_multiplier" 1.0
let penergy = Options.named_live_value "penergy" 0.0
let kenergy = Options.named_live_value "kenergy" 0.0
let energy = Options.named_live_value "energy" 0.0
let num_bodies = Options.named_live_value "number of bodies" 0
let truebounce = new Options.live_toggle false
let kidmode = new Options.live_toggle false
let _ =
truebounce#set_name "truebounce";
kidmode#set_name "kidmode"
let app_class = "Planets"
(********************************************************)
module IntSet =
AugSet.Make(struct type t = int
let compare = compare
end)
(********************************************************)
(*** Color Operations *********************************)
(********************************************************)
let intensity r g b = sqrt ((float_of_int r)**2.0 +.
(float_of_int g)**2.0 +.
(float_of_int b)**2.0)
let max_intensity r g b =
let maxval = max (max r g) b in
let mult = 255.0 /. (float_of_int maxval) in
let max_r = (float_of_int r) *. mult
and max_g = (float_of_int g) *. mult
and max_b = (float_of_int b) *. mult in
sqrt (max_r ** 2.0 +. max_g ** 2.0 +. max_b ** 2.0)
let test_color r g b =
(r >= 0 && r < 256) &&
(g >= 0 && g < 256) &&
(b >= 0 && b < 256)
let renormalize r g b =
let m = max_intensity r g b in
let i = intensity r g b in
let new_i = (m +. i) /. 2.0 in
let r = int_of_float ((float_of_int r) *. new_i /. i)
and g = int_of_float ((float_of_int g) *. new_i /. i)
and b = int_of_float ((float_of_int b) *. new_i /. i)
in
assert (test_color r g b);
rgb r g b
let rand_range () = Random.int 256
let rand_color () =
renormalize (rand_range ()) (rand_range ()) (rand_range ())
let change_trace_color id color =
try
let trace = IntMap.find id transient.traces in
transient.traces <-
IntMap.add ~key:id ~data:{trace with t_color = color} transient.traces
with
Not_found -> ()
let change_body_color_by_id id =
let color = rand_color () in
let changebodies bodies =
List.map ~f:(fun body ->
if body.id = id then
{ body with color = color }
else
body)
bodies
in
state.bodies <- changebodies state.bodies;
change_trace_color id color
let hlcolor = `Yellow
let fgcolor = `White
let bgcolor = `Black
let uw opt = match opt with
Some x -> x
| None -> failwith "Display.uw: attempt to unwrap null option"
(****************************************************)
(****************************************************)
(****************************************************)
let compute_energy () =
let p = Physics.penergy state.bodies
and k = Physics.kenergy state.bodies
in
penergy#set (log (abs_float p));
kenergy#set (log k);
energy#set (log (abs_float (p +. k)))
(****************************************************)
(****************************************************)
(****************************************************)
type ('a,'b,'c,'d) disp_state =
{ mutable toplevel: Widget.toplevel Widget.widget option;
mutable frame: Widget.frame Widget.widget option;
mutable canvas: Widget.canvas Widget.widget option;
mutable optionbox: ('c,'d) Options.optionbox option;
mutable dbodies: 'a IntMap.t;
mutable dtraces: 'b IntMap.t;
mutable tracked_ids: IntSet.t;
paused: Options.live_toggle;
tracing: Options.live_toggle;
tracking: Options.live_toggle;
}
let disp_state =
{ toplevel = None;
frame = None;
canvas = None;
optionbox = None;
dbodies = IntMap.empty;
dtraces = IntMap.empty;
tracked_ids = IntSet.empty;
paused = new Options.live_toggle false;
tracing = new Options.live_toggle false;
tracking = new Options.live_toggle false;
}
let get_dbody id = IntMap.find id disp_state.dbodies
let canvas () = uw disp_state.canvas
let init_optionbox () =
let obox = new Options.optionbox (uw disp_state.toplevel) in
obox#set_liveness true;
Options.add_option_live obox disp_state.paused
(new Options.toggle_option
~text:(Lstrings.get `paused)
~set:disp_state.paused#set
~get:disp_state.paused#get ());
Options.add_option_live obox disp_state.tracing
(new Options.toggle_option
~text:(Lstrings.get `tracing)
~set:disp_state.tracing#set
~get:disp_state.tracing#get ());
Options.add_option_live obox truebounce
(new Options.toggle_option
~text:(Lstrings.get `true_bounce)
~set:truebounce#set
~get:truebounce#get ());
Options.add_option_live obox transient.bound
(new Options.int_scale_option
~text:(Lstrings.get `trace_length)
~set:transient.bound#set
~get:transient.bound#get
~min:3.0 ~max:300.0 ());
Options.add_option_live obox gap_ms
(new Options.int_scale_option
~text:(Lstrings.get `disp_period)
~set:gap_ms#set
~get:gap_ms#get
~min:1.0 ~max:100.0 ());
Options.add_option_live obox iterations
(new Options.int_scale_option
~text:(Lstrings.get `iter_display)
~set:iterations#set
~get:iterations#get
~min:1.0 ~max:100.0 ());
Options.add_option_live obox state.delta
(new Options.float_entry_option
~text:(Lstrings.get `time_step)
~mult:1.05
~set:state.delta#set
~get:state.delta#get ());
Options.add_option_live obox gconst
(new Options.float_entry_option
~text:(Lstrings.get `g)
~mult:1.05
~set:gconst#set
~get:gconst#get ());
Options.add_option_live obox grav_exp
(new Options.float_entry_option
~text:(Lstrings.get `grav_exp)
~mult:1.01
~set:grav_exp#set
~get:grav_exp#get ());
Options.add_option obox
(new Options.void_entry_display
~text:(Lstrings.get `random_bodies) ());
Options.add_option_live obox diameter_multiplier
(new Options.float_entry_option
~text:(Lstrings.get `diam_mult)
~mult:1.01
~set:diameter_multiplier#set
~get:diameter_multiplier#get ());
Options.add_option_live obox random_vel_multiplier
(new Options.float_entry_option
~text:(Lstrings.get `rand_vel_mult)
~mult:1.01
~set:random_vel_multiplier#set
~get:random_vel_multiplier#get ());
(* Energy Display *)
Options.add_option_live obox kenergy
(new Options.float_entry_display
~text:(Lstrings.get `log_k_energy)
~set:kenergy#set
~get:kenergy#get ());
Options.add_option_live obox penergy
(new Options.float_entry_display
~text:(Lstrings.get `log_p_energy)
~set:penergy#set
~get:penergy#get ());
Options.add_option_live obox energy
(new Options.float_entry_display
~text:(Lstrings.get `log_energy)
~set:energy#set
~get:energy#get ());
Options.add_option_live obox num_bodies
(new Options.int_entry_display
~text:(Lstrings.get `num_planets)
~set:num_bodies#set
~get:num_bodies#get ());
disp_state.optionbox <- Some obox
let toggle_opt_dialog () =
match disp_state.optionbox with
None -> failwith "Display.create_dialog: Attempt to display optionbox when none is available"
| Some obox ->
if obox#mapped
then obox#destroy
else obox#create_dialog ~geometry:"+0+0" ~transient:(uw disp_state.toplevel) ~clas:app_class ()
(********************************************************)
(** Display Classes ***********************************)
(********************************************************)
(** Note: just screwing around here. Classes are not yet used. **)
class virtual ['a] display_item tag =
object (self)
val tag = tag
val mutable alive = true
method destroy =
if not alive then
failwith "Attempt to destroy same display_item more than once"
else
(Canvas.delete (canvas ()) [tag];
alive <- false)
method draw item =
if not alive
then failwith "Display.display_item#draw: attempt to draw deleted item."
else self#draw_internal item
(* Here's where you put the logic for drawing an item*)
method virtual draw_internal : 'a -> unit
end
(************************************************)
class dbody body tag =
let tag = tag in
object (self)
inherit [body] display_item tag
val id = body.id
method draw_internal body =
let r = body.radius *. state.zoom#v
and (x,y) = real_to_screen body.pos in
let (x1,y1,x2,y2) = (int_of_float (x -. r), int_of_float (y -. r),
int_of_float (x +. r), int_of_float (y +. r))
in
Canvas.configure_oval ~fill:body.color ~outline:fgcolor (canvas ()) tag;
Canvas.coords_set (canvas ()) tag ~xys:[ (x1,y1) ; (x2,y2) ]
initializer
begin
Canvas.bind ~events:[`ButtonPress] ~extend:false ~fields:[]
~action:(fun e -> delete_body_by_id id)
(* change_body_color_by_id id) *)
(canvas ()) tag;
self#draw_internal body
end
end
let new_dbody_with_tag body tag =
new dbody body tag
let new_dbody_from_body body =
let tag = Canvas.create_oval ~x1:0 ~y1:0 ~x2:0 ~y2:0 (canvas ()) in
new dbody body tag
(************************************************)
class dtrace () =
let tag =
try Canvas.create_line ~xys:[(0,0);(0,0)] (canvas ())
with e -> failwith (sprintf "line drawing failed: %s" (Printexc.to_string e))
in
let _ = Canvas.configure_line ~smooth:false (canvas ()) tag in
object (self)
inherit [trace] display_item tag
method draw_internal trace =
let screen_trace =
List.map ~f:pair_to_int (List.map ~f:real_to_screen (trace_to_list trace))
in
if List.length screen_trace > 1 then
( Canvas.configure_line ~fill:trace.t_color (canvas ()) tag;
Canvas.coords_set (canvas ()) tag ~xys:screen_trace )
end
(**********************************************************)
(** Classes used in the placement of new planets *******)
(**********************************************************)
class ['a] new_planet () =
let tag = Canvas.create_oval ~x1:0 ~y1:0 ~x2:0 ~y2:0 (canvas ()) in
object (self)
inherit ['a] display_item tag
val mutable radius = 0.0
val mutable pos = (0,0)
val mutable color = fgcolor
method draw_internal (x,y) =
let radius = int_of_float radius in
let coords = [(x-radius,y-radius);(x+radius,y+radius)] in
Canvas.coords_set (canvas ()) tag ~xys:coords;
pos <- (x,y)
method set_radius _radius =
radius <- _radius;
self#draw_internal pos
method set_color _color =
Canvas.configure_oval ~fill:_color (canvas ()) tag;
color <- _color
method tag = tag
method pos = pos
method radius = radius
method color = color
initializer
Canvas.configure_oval ~outline:fgcolor (canvas ()) tag
end
(******)
class ['a] new_velocity planet =
let pos = planet#pos in
let tag = Canvas.create_line ~xys:[pos; pos] ~arrow:`Last (canvas ()) in
let _ = Canvas.configure_line ~fill:fgcolor (canvas ()) tag in
object (self)
inherit ['a] display_item tag
val mutable vpos = planet#pos
method draw_internal _vpos =
Canvas.coords_set (canvas ()) tag ~xys:[pos; _vpos];
vpos <- _vpos
method vpos = vpos
method tag = tag
end
(*********************************************************)
(** Functions for selecting bodies *********************)
(*********************************************************)
let selected_bodies pos1 pos2 =
let (x1,y1) = pair_to_float pos1
and (x2,y2) = pair_to_float pos2
in
let x1,x2 = (min x1 x2), (max x1 x2)
and y1,y2 = (min y1 y2), (max y1 y2)
in
List.filter ~f:(fun body ->
let (x,y) = real_to_screen body.pos in
x1 <= x && x <= x2 &&
y1 <= y && y <= y2)
state.bodies
let selected_ids pos1 pos2 =
IntSet.of_list
(List.map ~f:(fun body -> body.id) (selected_bodies pos1 pos2))
let recenter_on_selection pos1 pos2 =
debug_msg "recentering on selection";
let bodies = selected_bodies pos1 pos2 in
if bodies != [] then
begin
debug_msg (sprintf "recentering on %d bodies" (List.length bodies));
Physics.zero_speed_bodies bodies;
Physics.center_bodies bodies
end
else
debug_msg "no bodies selected to recenter on"
let create_rectangle color pos1 pos2 =
let (x1,y1) = pos1
and (x2,y2) = pos2
in
Canvas.create_rectangle ~x1 ~y1 ~x2 ~y2 ~outline:color (canvas ())
(***********************************************************)
(** Primitives for displaying and deleting display items *)
(***********************************************************)
let delete_dbody_id id =
try
let dbody = get_dbody id in
disp_state.dbodies <- IntMap.remove id disp_state.dbodies;
dbody#destroy
with Not_found ->
printf "No dbody with id %d" id;
print_newline ()
let delete_trace_id id =
try
let dtrace = IntMap.find id disp_state.dtraces in
disp_state.dtraces <- IntMap.remove id disp_state.dtraces;
dtrace#destroy
with Not_found ->
printf "No dtrace with id: %d" id;
print_newline ()
(***************************************************)
(* Lookup functions for dbody/dtrace.
* If one is not found, one is created.
*)
let get_dbody body =
try
IntMap.find body.id disp_state.dbodies
with
Not_found ->
let dbody = new_dbody_from_body body in
disp_state.dbodies <- IntMap.add ~key:body.id ~data:dbody
disp_state.dbodies;
dbody
let get_dtrace id =
try
IntMap.find id disp_state.dtraces
with
Not_found ->
let dtrace = new dtrace () in
disp_state.dtraces <- IntMap.add ~key:id ~data:dtrace
disp_state.dtraces;
dtrace
(****************)
let draw_body body = (get_dbody body)#draw body
let draw_trace ~key:id ~data:trace = (get_dtrace id)#draw trace
let draw_bodies () = List.iter ~f:draw_body state.bodies
let draw_traces () = IntMap.iter ~f:draw_trace transient.traces
(****************)
let change_all_body_colors () =
let changebodies bodies =
List.map ~f:(fun body ->
let color = rand_color () in
change_trace_color body.id color;
{ body with color = color} )
bodies
in
state.bodies <- changebodies state.bodies
(********************************************************)
let remove_dead_bodies () =
let disp_ids = IntSet.of_list (IntMap.keys disp_state.dbodies) in
let body_ids = IntSet.of_list (List.map ~f:(fun body -> body.id) state.bodies) in
let dead_ids = IntSet.diff disp_ids body_ids in
IntSet.iter ~f:delete_dbody_id dead_ids
let remove_dead_traces () =
let disp_ids = IntSet.of_list (IntMap.keys disp_state.dtraces) in
let trace_ids = IntSet.of_list (IntMap.keys transient.traces) in
let dead_ids = IntSet.diff disp_ids trace_ids in
IntSet.iter ~f:delete_trace_id dead_ids
let remove_all_traces () =
let disp_ids = IntSet.of_list (IntMap.keys disp_state.dtraces) in
IntSet.iter ~f:delete_trace_id disp_ids
let _ =
disp_state.tracing#register_callback
(fun oldval newval ->
if not newval then remove_all_traces ())
let remove_dead () =
remove_dead_bodies ();
remove_dead_traces ()
(********************************************************)
let redraw_all_basic () =
draw_bodies ();
if disp_state.tracing#v then draw_traces ()
let redraw_all () =
redraw_all_basic ();
remove_dead ()
(*********************************************************)
(*********************************************************)
(*********************************************************)
let pause () =
disp_state.paused#set true
let resume () =
disp_state.paused#set false
let init_body ~color ~pos ~velocity ~radius =
let body = { pos = pos;
velocity = velocity;
radius = radius;
color = color;
mass = radius ** 3.0;
id = Random.bits ();
i = None;
}
in
set_undo_point ();
state.bodies <- body::state.bodies;
set_goback_point ();
body
let add_new_body ~color ~pos ~vpos ~r =
let r = r /. state.zoom#v in
init_body ~color ~pos:(screen_to_real pos)
~velocity:((state.zoom#v *. 10.0) <|>
(pair_to_float vpos <-> pair_to_float pos))
~radius:r
let add_dbody_from_tag body tag =
let dbody = new_dbody_with_tag body tag in
disp_state.dbodies <- IntMap.add ~key:body.id ~data:dbody disp_state.dbodies
(* track center-of-mass *)
let track_com () =
if disp_state.tracking#v then
let tbodies = List.filter ~f:(fun body ->
IntSet.mem body.id
disp_state.tracked_ids)
state.bodies
in
if tbodies != [] then
(Physics.zero_speed_bodies tbodies;
Physics.center_bodies tbodies)
(*****************************************************)
(*****************************************************)
let file_join filelist =
let rec file_join filelist partial = match filelist with
[] -> partial
| hd::tl -> file_join tl (Filename.concat partial hd)
in
file_join filelist ""
(* let toggle b = if b then false else true *)
let planet_radius i = (float_of_int i) *. 5.0 *. diameter_multiplier#v
let is_num c =
(int_of_char '0') <= (int_of_char c) &&
(int_of_char c) <= (int_of_char '9')
let to_num c = (int_of_char c) - (int_of_char '0')
(* Center weighted random float *)
let cw_rand_float level f =
let x = Random.float 2.0 in
let x = x -. 1.0 in
let mult =
if x >= 0.0
then (x**level +. 1.0) /. 2.0
else (-.abs_float(x**level) +. 1.0) /. 2.0
in
mult *. f
let cw_rand_int level i =
let f_val = cw_rand_float level (float i) in
round f_val
let random_velocity size =
let screen_vel = ( (Random.float (2.0 *. size)) -. size,
(Random.float (2.0 *. size)) -. size )
in
random_vel_multiplier#v <*> (state.zoom#v <|> screen_vel)
let random_planet () =
let screen_radius = planet_radius 3
and screen_pos = (Random.float (float !screen_width),
Random.float (float !screen_height))
and velocity = random_velocity 0.9
and color = rand_color ()
in
let pos = screen_to_real_float screen_pos
and radius = screen_radius /. state.zoom#v
in
ignore (init_body ~color ~pos ~velocity ~radius)
let mag v = sqrt (dot v v)
let tweak_size = 0.1
let rand_tweak size =
((Random.float 2.0) -. 1.) *. size *. tweak_size
let rdist ?(n=6) low high =
let x = ref 0.0 in
for i = 0 to n -1 do
x := !x +. Random.float (1.0/. float n)
done;
low +. (high -. low) *. !x
(** adds a planet at what would be a near-orbital velocity
if the force induced on the new planet all came from a
single planet. *)
let orbital_planet dir =
let screen_radius =
planet_radius (Random.int 3 + 1) in
let radius = screen_radius /. state.zoom#v
in
let color = rand_color () in
let screen_pos = (rdist ~n:3 0. (float !screen_width),
rdist ~n:3 0. (float !screen_height)) in
let pos = screen_to_real_float screen_pos in
let ovelocity =
Physics.induced_orbital_velocity state.bodies ~pos dir in
let speed = mag ovelocity in
let velocity = ovelocity +| (rand_tweak speed,rand_tweak speed)
in ignore (init_body ~color ~pos ~velocity ~radius)
(*******************************************************)
(** Callbacks *************************************)
(*******************************************************)
type key_matcher = | Key of string
| KeySym of string
| KeyList of string list
| Other
type key_handler = { key: key_matcher;
description: string;
handler: eventInfo -> unit;
}
let rec lookup handlers key =
match handlers with
| handler::tl ->
if handler.key = key
then Some handler
else lookup tl key
| [] -> None
let handler_to_string h =
let matcher = match h.key with
Key s -> s
| KeySym s -> s
| KeyList slist -> String.concat ", " slist
| Other -> "Any other key"
in
"\t" ^ matcher ^
(if String.length matcher > 8 then "" else "\t") ^
"\t " ^ h.description
let hlist_to_string hlist =
let slist = List.map ~f:handler_to_string hlist in
String.concat "\n" slist
(***********************************************************)
let rec get_next_key ~f =
let handle e =
f e.ev_Char;
set_normal_key_handler ()
in
bind_class ~events:[`KeyPress] ~extend:false
~fields:[`Char] ~action:handle app_class
(***********************************************************)
(** UI State Machine ************************************)
(***********************************************************)
(*
Events: Motion, ButtonRelease, ButtonPress, KeyPress
A: default_state:
def_key_map
"a" -> B:create_planet
ButtonPress -> D:draw_rectangle
Motion -> nothing
ButtonRelease -> nothing
B: create_planet:
Save Pause, pause
[0-9] -> change_planet_size
Motion -> move planet
BottonPress -> place planet, C:set_planet_direction
ButtonRelease -> nothing (can't be reached anyway)
C: set_planet_direction:
[0-9] -> change_planet_size
Motion -> move arrow
ButtonPress -> set arrow, restore pause state, A:default_state
ButtonRelease -> nothing
D: draw_rectangle:
save pause, pause
No keymap
ButtonPress -> nothing
ButtonRelease -> restore pause A:default_state
Motion -> move rectangle
*)
(***********************************************************)
(** Planet Select ****************************************)
(***********************************************************)
and select_planet_handler e =
clear_select_planet_handler ();
clear_key_handler ();
let pos = (e.ev_MouseX,e.ev_MouseY) in
let pos1 = ref pos and pos2 = ref pos in
let tag = create_rectangle fgcolor !pos1 !pos2 in
let move e =
pos2 := (e.ev_MouseX,e.ev_MouseY);
Canvas.coords_set (canvas ()) tag ~xys:[!pos1; !pos2]
and finish pause_state e =
Canvas.delete (canvas ()) [tag];
disp_state.tracked_ids <- selected_ids !pos1 !pos2;
disp_state.paused#set pause_state;
disp_state.tracking#set true;
restore_normal_bindings ();
redraw_all ()
in
let old_pause_state = disp_state.paused#v in
disp_state.paused#set true;
bind ~events:[`Motion] ~extend:false ~fields:[`MouseX;`MouseY]
~action:move (uw disp_state.canvas);
bind ~events:[`ButtonRelease] ~extend:false
~fields:[] ~action:(finish old_pause_state)
(uw disp_state.canvas)
and set_select_planet_handler () =
bind ~events:[`ButtonPress] ~extend:false ~fields:[`MouseX; `MouseY]
~action:select_planet_handler
(uw disp_state.canvas)
and clear_select_planet_handler () =
bind ~events:[`ButtonPress] (uw disp_state.canvas)
(***********************************************************)
(** Add Planet ******************************************)
(***********************************************************)
and add_planet pos rad_int =
let rec move_planet planet e =
planet#draw (e.ev_MouseX,e.ev_MouseY)
and set_radius planet e =
if String.length e.ev_Char > 0 && is_num e.ev_Char.[0]
then
let rad_int = to_num e.ev_Char.[0] in
planet#set_radius (planet_radius rad_int)
else if e.ev_KeySymString="Down" then
planet#set_radius (planet#radius *. (1.0/.1.1))
else if e.ev_KeySymString="Up" then
planet#set_radius (planet#radius *. 1.1)
and move_velocity velocity e =
velocity#draw (e.ev_MouseX,e.ev_MouseY)
and set_place planet pause_state e =
planet#draw (e.ev_MouseX,e.ev_MouseY);
planet#set_color (rand_color ());
let velocity = new new_velocity planet
in
bind ~events:[`Motion] ~extend:false ~fields:[ `MouseX; `MouseY] ~action:(move_velocity velocity)
(uw disp_state.canvas);
bind ~events:[`ButtonPress] ~extend:false ~fields:[] ~action:(finish pause_state planet velocity)
(uw disp_state.canvas)
and finish pause_state planet velocity e =
bind ~events:[`Motion] ~extend:false (uw disp_state.canvas);
bind ~events:[`ButtonPress] ~extend:false (uw disp_state.canvas);
restore_normal_bindings ();
disp_state.paused#set pause_state;
velocity#destroy;
let body = add_new_body ~color:planet#color ~pos:planet#pos ~vpos:velocity#vpos ~r:planet#radius in
add_dbody_from_tag body planet#tag
in
let old_pause_state = disp_state.paused#v in
let planet = new new_planet () in
planet#set_radius (planet_radius rad_int);
planet#draw pos;
disp_state.paused#set true;
bind ~events:[`Motion] ~extend:false ~fields:[ `MouseX; `MouseY] ~action:(move_planet planet)
(uw disp_state.canvas);
bind_class ~events:[`KeyPress] ~extend:false ~fields:[ `Char; `KeySymString ] ~action:(set_radius planet)
app_class;
bind ~events:[`ButtonPress] ~extend:false ~fields:[`MouseX; `MouseY]
~action:(set_place planet old_pause_state)
(uw disp_state.canvas);
bind ~events:[`ButtonRelease] ~extend:false ~fields:[]
(uw disp_state.canvas)
(***********************************************************)
(***********************************************************)
and keyhandlers =
[
{ key = Key "H";
description = (Lstrings.get `display_help );
handler =
(fun e ->
Help.create_window (uw disp_state.toplevel)
(hlist_to_string keyhandlers));
};
{ key = Key "a";
description = (Lstrings.get `add_planet );
handler = (fun e ->
add_planet (e.ev_MouseX,e.ev_MouseY) 3);
};
{ key = KeyList ["plus";"equal";"KP_Add"];
description = (Lstrings.get `zoom_in );
handler = (fun e ->
state.zoom#set (state.zoom#v *. 1.1);
redraw_all_basic ());
};
{ key = KeyList ["minus";"underscore"; "KP_Subtract"];
description = (Lstrings.get `zoom_out );
handler = (fun e ->
state.zoom#set (state.zoom#v /. 1.1);
redraw_all_basic ());
};
{ key = Key "b";
description = (Lstrings.get `toggle_true_bounce);
handler = (fun e -> truebounce#flip;)
};
{ key = KeyList ["c"; "space"];
description = (Lstrings.get `center);
handler = (fun e ->
disp_state.tracking#set false;
Physics.zero_speed ();
Physics.center ();
clear_all_traces ();
redraw_all_basic ())
};
{ key = Key "k";
description = (Lstrings.get `option_dialog);
handler = (fun e -> toggle_opt_dialog ())
};
{ key = Key "o";
description = (Lstrings.get `change_all_colors);
handler = (fun e ->
change_all_body_colors ();
redraw_all_basic ());
};
{ key = KeyList [ "q" ; "Escape"] ;
description = (Lstrings.get `quit);
handler = (fun e -> exit 0);
};
{ key = Key "e" ;
description = (Lstrings.get `reset);
handler = (fun e ->
clear_all_traces ();
state.bodies <- [];
redraw_all ());
};
{ key = Key "s";
description = (Lstrings.get `save );
handler = (fun e ->
let old_pause_state = disp_state.paused#v in
disp_state.paused#set true;
get_next_key ~f:(fun key ->
clear_all_traces ();
SaveState.write_state key;
disp_state.paused#set old_pause_state
));
};
{ key = Key "l";
description = (Lstrings.get `load);
handler = (fun e ->
let old_pause_state = disp_state.paused#v in
disp_state.paused#set true;
get_next_key ~f:(fun key ->
debug_msg "Starting to load universe";
clear_all_traces ();
SaveState.read_state key;
debug_msg (sprintf "Done loading: %d planets"
(List.length state.bodies));
redraw_all ();
debug_msg "Done redrawing";
disp_state.paused#set old_pause_state
));
};
{ key = Key "u";
description = (Lstrings.get `undo);
handler = (fun e ->
undo ();
clear_all_traces ();
redraw_all ())
};
{ key = Key "g";
description = (Lstrings.get `goback);
handler = (fun e ->
goback ();
clear_all_traces ();
redraw_all ())
};
{ key = Key "p";
description = (Lstrings.get `toggle_pause);
handler = (fun e ->
disp_state.paused#flip)
};
{ key = Key "t";
description = (Lstrings.get `toggle_trace);
handler = (fun e ->
disp_state.tracing#flip)
};
{ key = Key "d";
description = (Lstrings.get `double_trace);
handler = (fun e ->
transient.bound#set (min 300 (transient.bound#v * 2)));
};
{ key = Key "h";
description = (Lstrings.get `halve_trace );
handler = (fun e ->
transient.bound#set (max 3 (transient.bound#v / 2))
)
};
{ key = Key "j";
description = (Lstrings.get `place_random_orbital );
handler = (fun e ->
orbital_planet (Random.int 2 = 1) )
};
{ key = Key "J";
description = (Lstrings.get `place_random_orbital_uni );
handler = (fun e -> orbital_planet true)
};
{ key = Key "r";
description = (Lstrings.get `place_random );
handler = (fun e ->
random_planet () )
};
{ key = Key "x";
description = (Lstrings.get `cancel_com );
handler = (fun e ->
disp_state.tracking#flip;
)
};
(* Panning Around *)
{ key = KeySym "Up";
description = (Lstrings.get `pan_up);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let y_s = y_s -. (float !screen_height)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ());
};
{ key = KeySym "Down";
description = (Lstrings.get `pan_down);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let y_s = y_s +. (float !screen_height)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ()
);
};
{ key = KeySym "Left";
description = (Lstrings.get `pan_left);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let x_s = x_s -. (float !screen_width)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ()
);
};
{ key = KeySym "Right";
description = (Lstrings.get `pan_right);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let x_s = x_s +. (float !screen_width)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ()
);
};
]
and kid_keyhandlers =
[
{ key = KeyList ["KP_Home"; "KP_Up"; "KP_Prior"; "KP_Left"; "KP_Begin";
"KP_Right"; "KP_End"; "KP_Down"; "KP_Next"; "KP_Insert";
"KP_Delete"; "KP_En`ter"; "KP_Add"; "KP_Multiply";
"KP_Divide"; "Num_Lock"; ];
description = (Lstrings.get `place_random );
handler = (fun e ->
random_planet () )
};
{ key = Key "=";
description = (Lstrings.get `zoom_in );
handler = (fun e ->
state.zoom#set (state.zoom#v *. 1.1);
redraw_all_basic ());
};
{ key = Key "-";
description = (Lstrings.get `zoom_out );
handler = (fun e ->
state.zoom#set (state.zoom#v *. 0.9);
redraw_all_basic ());
};
{ key = KeySym "Up";
description = (Lstrings.get `pan_up);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let y_s = y_s -. (float !screen_height)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ());
};
{ key = KeySym "Down";
description = (Lstrings.get `pan_down);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let y_s = y_s +. (float !screen_height)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ()
);
};
{ key = KeySym "Left";
description = (Lstrings.get `pan_left);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let x_s = x_s -. (float !screen_width)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ()
);
};
{ key = KeySym "Right";
description = (Lstrings.get `pan_right);
handler = (fun e ->
let (x_s,y_s) = real_to_screen(state.center#v) in
let x_s = x_s +. (float !screen_width)/.30.0 in
let (x,y) = screen_to_real( pair_to_int (x_s,y_s) ) in
state.center#set (x,y);
redraw_all_basic ()
);
};
{ key = KeySym "space";
description = (Lstrings.get `center);
handler = (fun e ->
disp_state.tracking#set false;
Physics.zero_speed ();
Physics.center ();
clear_all_traces ();
redraw_all_basic ())
};
{ key = KeyList ["q";"w";"e";"a";"s";"d";"z";"x";"c"];
description = (Lstrings.get `change_all_colors);
handler = (fun e ->
change_all_body_colors ();
redraw_all_basic ());
};
{ key = KeyList ["1";"2";"3";"4";"5";"6";"7";"8";"9"];
description = (Lstrings.get `toggle_trace);
handler = (fun e ->
disp_state.tracing#flip)
};
{ key = KeySym "Escape";
description = (Lstrings.get `reset);
handler = (fun e ->
clear_all_traces ();
state.bodies <- [];
redraw_all ());
};
{ key = Other;
description = (Lstrings.get `place_random );
handler = (fun e -> orbital_planet (Random.int 2 = 0) )
};
]
and main_key_handler e =
debug_msg "Key handler";
Focus.force (uw disp_state.toplevel);
let key = e.ev_Char
and keysym = e.ev_KeySymString in
let rec loop handlers = match handlers with
handler::tl ->
if (match handler.key with
Key hkey -> hkey = key
| KeySym hkeysym -> hkeysym = keysym
| KeyList hkeys -> List.mem keysym hkeys
| Other -> true )
then
( debug_msg handler.description;
handler.handler e; )
else
loop tl
| [] -> debug_msg ("Other Key: " ^ keysym)
in
if kidmode#v
then loop kid_keyhandlers
else loop keyhandlers
and clear_key_handler () =
bind_class ~events:[`KeyPress] app_class
and set_normal_key_handler () =
bind_class ~events:[`KeyPress] ~extend:false ~fields:[`Char;`MouseX;`MouseY;`KeySymString]
~action:main_key_handler app_class
(* sets up all handlers that might be fiddled with *)
and restore_normal_bindings () =
set_select_planet_handler ();
set_normal_key_handler ();
bind ~events:[`ButtonRelease] (canvas ());
bind ~events:[`Motion] (canvas ())
(***************)
let rec timer_cb () =
let compute_timer = MTimer.create () in
let full_timer = MTimer.create () in
let _ = if not disp_state.paused#v then
(
MTimer.start full_timer;
update ();
MTimer.start compute_timer;
Physics.simulate ~bounce:truebounce#v iterations#v;
compute_energy ();
num_bodies#set (List.length state.bodies);
MTimer.stop compute_timer;
track_com ();
update_traces ();
(let old_debugging = !debugging in
debugging := false;
redraw_all ();
debugging := old_debugging);
MTimer.stop full_timer;
(*
let compute_time_ms = MTimer.read_ms compute_timer
and full_time_ms = MTimer.read_ms full_timer in
debug_msg (sprintf "compute: %f ms, other: %f ms"
compute_time_ms (full_time_ms -. compute_time_ms))
*)
)
in
let time_left_ms =
max 0 (int_of_float (float_of_int gap_ms#v -. MTimer.read_ms full_timer )) in
let full_time_ms = MTimer.read_ms full_timer in
Timer.set ~ms:time_left_ms ~callback:timer_cb
let set_size e =
debug_msg "Resizing";
let width, height = e.ev_Width, e.ev_Height in
screen_center := float_of_int (width/2), float_of_int (height/2);
screen_width := width;
screen_height := height
(******************************************************************)
let grab () = Grab.set ~global:true (uw disp_state.toplevel)
let ungrab () = Grab.release (uw disp_state.toplevel)
(* Toggle the focus mode. This is the first step towards
building a kid-friendly version *)
let toggle_kidmode () =
(* transient.bounce#set true; *)
match Grab.status (uw disp_state.toplevel) with
`None -> grab ()
| `Global | `Local -> ungrab ()
let _ = kidmode#register_callback (fun oldv newv -> toggle_kidmode ())
let init () =
disp_state.toplevel <- Some (openTk ~clas:app_class ());
disp_state.frame <- Some
(Frame.create ~width:!screen_width ~height:!screen_height
(uw disp_state.toplevel));
disp_state.canvas <- Some
(Canvas.create ~width:init_screen_width ~height:init_screen_height (uw disp_state.frame));
screen_center := pair_to_float (init_screen_height / 2, init_screen_width / 2);
if SaveState.help_start
then Help.create_window (uw disp_state.toplevel) (hlist_to_string keyhandlers);
Canvas.configure ~background:bgcolor (canvas ());
Pack.configure ~expand:true ~fill:`Both [uw disp_state.frame];
Pack.configure ~expand:true ~fill:`Both [uw disp_state.canvas];
timer_cb ();
restore_normal_bindings ();
bind ~events:[`Configure] ~extend:false ~fields:[`Width; `Height] ~action:set_size
(canvas ());
bind_class ~events:[`Modified ([`Control; `Shift], `KeyPressDetail "K")] ~extend:true
~action:(fun _ -> kidmode#flip) app_class;
appname_set "Planets";
init_optionbox ();
mainLoop ()
let license_notice = sprintf "
Planets %s, Copyright (C) 2001-2003 Yaron M. Minsky
Planets comes with ABSOLUTELY NO WARRANTY;
This is free software, and you are welcome to redistribute it
under the terms of the GNU GPL; see the COPYING file for details.
" version
let main () =
print_string license_notice; print_newline ();
Random.self_init ();
state.delta#set 0.45;
state.bodies <- [];
init ()
let _ = if not !Sys.interactive then main ()
|