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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /lib/gs/examples/rubber.erl
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The R13B03 release.OTP_R13B03
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1996-2009. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+%%
+%% ------------------------------------------------------------
+%% A rubberbanding example in Erlang
+%% ------------------------------------------------------------
+
+-module(rubber).
+
+-export([start/0, init/0]).
+
+start() ->
+ spawn(rubber,init,[]).
+
+init() ->
+ I=gs:start(),
+ Win = gs:window(I,[{title,"Rubberbanding in Erlang"},
+ {width,300},{height,200}]),
+ C= gs:canvas(Win,[{width,300},{height,200},{bg,green}]),
+ gs:radiobutton(Win,[{width,100},{label,{text,"Oval"}},{align,w},
+ {data,oval},{y,0},{select,true}]),
+ gs:radiobutton(Win,[{width,100},{label,{text,"Rectangle"}},{align,w},
+ {data,rectangle},{y,30}]),
+ gs:radiobutton(Win,[{width,100},{label,{text,"Line"}},{align,w},
+ {data,line},{y,60}]),
+ gs:button(Win,[{label,{text,"Quit"}},{data,quit},{y,90}]),
+ gs:config(Win,[{motion,true},{buttonpress,true},{buttonrelease,true}]),
+ gs:config(Win,{map,true}),
+ loop(C,nil,oval,0,0).
+
+
+loop(Win,Obj,Objtype,X1,Y1) ->
+ receive
+ {gs,_,motion,_,[X2,Y2]} ->
+ flush(Win,Obj,Objtype,X1,Y1,X2,Y2);
+ {gs,_,buttonpress,_,[1,X2,Y2]} ->
+ down(Win,Obj,Objtype,X2,Y2);
+ {gs,_,buttonrelease,_,[1,X2,Y2]} ->
+ up(Win,Obj,Objtype,X1,Y1,X2,Y2);
+ {gs,_,click,quit,_} ->
+ exit(normal);
+ {gs,_,click,Newtype,_} ->
+ loop(Win,Obj,Newtype,X1,Y1);
+ {gs,_,destroy,_,_} ->
+ exit(normal);
+ Other ->
+ io:format("Other:~w~n",[Other]),
+ loop(Win,Obj,Objtype,X1,Y1)
+ end.
+
+
+down(Win,nil,oval,X1,Y1) ->
+ Obj = gs:create(oval,Win,[{coords,[{X1,Y1},{X1+1,Y1+1}]},{fill,red}]),
+ loop(Win,Obj,oval,X1,Y1);
+down(Win,nil,line,X1,Y1) ->
+ Obj = gs:create(line,Win,[{coords,[{X1,Y1},{X1+1,Y1+1}]},{width,3},{fg,black}]),
+ loop(Win,Obj,line,X1,Y1);
+down(Win,nil,Objtype,X1,Y1) ->
+ Obj = gs:create(Objtype,Win,[{coords,[{X1,Y1},{X1+1,Y1+1}]},{bw,2},{fg,blue}]),
+ loop(Win,Obj,Objtype,X1,Y1);
+down(Win,Obj,Objtype,X1,Y1) ->
+ gs:destroy(Obj),
+ down(Win,nil,Objtype,X1,Y1).
+
+up(Win,nil,Objtype,_X1,_Y1,X2,Y2) ->
+ loop(Win,nil,Objtype,X2,Y2);
+up(Win,Obj,Objtype,X1,Y1,X2,Y2) ->
+ gs:config(Obj,{coords,[{X1,Y1},{X2,Y2}]}),
+ loop(Win,nil,Objtype,X2,Y2).
+
+
+move(Win,nil,Objtype,X1,Y1,_X2,_Y2) ->
+ loop(Win,nil,Objtype,X1,Y1);
+move(Win,Obj,Objtype,X1,Y1,X2,Y2) ->
+ gs:config(Obj,{coords,[{X1,Y1},{X2,Y2}]}),
+ loop(Win,Obj,Objtype,X1,Y1).
+
+
+flush(Win,Obj,Objtype,X1,Y1,X2,Y2) ->
+ receive
+ {gs,_,motion,_,[XX2,YY2]} ->
+ flush(Win,Obj,Objtype,X1,Y1,XX2,YY2)
+ after
+ 0 -> move(Win,Obj,Objtype,X1,Y1,X2,Y2)
+ end.
+
+%% ------------------------------------------------------------