1 files changed, 75 insertions, 0 deletions
diff --git a/lib/gs/examples/line_demo.erl b/lib/gs/examples/line_demo.erl
new file mode 100644
index 0000000000..c8a6a69e2e
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+++ b/lib/gs/examples/line_demo.erl
@@ -0,0 +1,75 @@
+%%
+%% %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 simple demo showing a line
+%% bouncing within a window.
+%% ------------------------------------------------------------
+
+-module(line_demo).
+
+-export([start/0,init/0,line/3]).
+
+start() ->
+    spawn(line_demo,init,[]).
+
+init() ->
+    I= gs:start(),
+    W= gs:window(I,[{title,"Line Demo"},{width,300},{height,300},{map,true}]), 
+    C= gs:canvas(W,[{width,300},{height,300},{bg,blue}]),
+    gs:button(W,[{label,{text,"Quit"}},{width,40},{bg,yellow}]),
+    Line2 = gs:line(C,[{coords,[{0,0},{50,50}]},{fg,white},{width,3}]),
+    line(Line2,{100,100,9.5,5},{0,0,-6,-8.4}).
+    
+    
+
+line(Line,{X1,Y1,DX1,DY1},{X2,Y2,DX2,DY2}) ->
+    {NX1,NDX1} = cc(X1,DX1),
+    {NY1,NDY1} = cc(Y1,DY1),
+    {NX2,NDX2} = cc(X2,DX2),
+    {NY2,NDY2} = cc(Y2,DY2),
+    gs:config(Line,{coords,[{NX1,NY1},{NX2,NY2}]}),    
+    receive
+	{gs,_,click,_,_} -> exit(normal);
+	{gs,_,destroy,_,_} -> exit(normal)
+    after 50 ->
+	    true
+    end,
+    line(Line,{NX1,NY1,NDX1,NDY1},{NX2,NY2,NDX2,NDY2}).
+
+cc(X,DX) ->
+    if 
+	DX>0 ->
+	    if 
+		X<300 ->
+		    {X+DX,DX};
+		x>=300 ->
+		    {X-DX,-DX}
+	    end;
+	DX<0 ->
+	    if
+		X>0 ->
+		    {X+DX,DX};
+		X=<0 ->
+		    {X-DX,-DX}
+	    end
+    end.
+
+%% ------------------------------------------------------------