From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/wx/examples/demo/ex_graphicsContext.erl | 146 ++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 lib/wx/examples/demo/ex_graphicsContext.erl

(limited to 'lib/wx/examples/demo/ex_graphicsContext.erl')

diff --git a/lib/wx/examples/demo/ex_graphicsContext.erl b/lib/wx/examples/demo/ex_graphicsContext.erl
new file mode 100644
index 0000000000..bcd7a75be0
--- /dev/null
+++ b/lib/wx/examples/demo/ex_graphicsContext.erl
@@ -0,0 +1,146 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 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%
+
+-module(ex_graphicsContext).
+
+-behaviour(wx_object).
+
+%% Client API
+-export([start/1]).
+
+%% wx_object callbacks
+-export([init/1, terminate/2,  code_change/3,
+	 handle_info/2, handle_call/3,
+	 handle_event/2, handle_sync_event/3]).
+
+-include_lib("wx/include/wx.hrl").
+
+-record(state, 
+	{
+	  parent,
+	  config,
+	  win,
+	  pen,
+	  brush,
+	  font
+	}).
+
+start(Config) ->
+    wx_object:start_link(?MODULE, Config, []).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+init(Config) ->
+    wx:batch(fun() -> do_init(Config) end).
+
+do_init(Config) ->
+    Parent = proplists:get_value(parent, Config),  
+    Panel = wxPanel:new(Parent, []),
+
+    %% Setup sizers
+    MainSizer = wxBoxSizer:new(?wxVERTICAL),
+    Sizer = wxStaticBoxSizer:new(?wxVERTICAL, Panel, 
+				 [{label, "wxGrapicsContext"}]),
+
+    Win = wxPanel:new(Panel, []),
+    Pen = wxPen:new(),
+    Brush = wxBrush:new(?wxBLACK),
+    Font = wxFont:new(),
+    wxFont:setWeight(Font, ?wxBOLD),
+
+    wxPanel:connect(Win, paint, [callback]),
+
+    %% Add to sizers
+    wxSizer:add(Sizer, Win, [{flag, ?wxEXPAND},
+				{proportion, 1}]),
+    wxSizer:add(MainSizer, Sizer, [{flag, ?wxEXPAND},
+				   {proportion, 1}]),
+
+    wxPanel:setSizer(Panel, MainSizer),
+    {Panel, #state{parent=Panel, config=Config, win = Win,
+		   pen = Pen, brush = Brush, font = Font}}.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Sync events i.e. from callbacks must return ok, it can not return a new state.
+%% Do the redrawing here.
+handle_sync_event(#wx{event = #wxPaint{}},_,
+		  #state{win=Win, pen = Pen, brush = Brush, font = Font}) ->
+    %% PaintDC must be created in a callback to work on windows.
+    DC = wxPaintDC:new(Win),
+    %% Nothing is drawn until wxPaintDC is destroyed.
+    draw(DC, Pen, Brush, Font),
+    wxPaintDC:destroy(DC),
+    ok.
+%% Async Events are handled in handle_event as in handle_info
+handle_event(#wx{}, State) ->
+    {noreply, State}.
+
+%% Callbacks handled as normal gen_server callbacks
+handle_info(Msg, State) ->
+    demo:format(State#state.config, "Got Info ~p\n", [Msg]),
+    {noreply, State}.
+
+handle_call(Msg, _From, State) ->
+    demo:format(State#state.config, "Got Call ~p\n", [Msg]),
+    {reply,{error, nyi}, State}.
+
+code_change(_, _, State) ->
+    {stop, ignore, State}.
+
+terminate(_Reason, _State) ->
+    ok.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Local functions
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+draw(Win, Pen0, _Brush0, Font0) ->
+    try
+	Canvas = wxGraphicsContext:create(Win),
+	Pen    = wxGraphicsContext:createPen(Canvas, Pen0),
+	wxGraphicsContext:setPen(Canvas, Pen),
+	Brush = wxGraphicsContext:createLinearGradientBrush(Canvas, 0.0,0.0, 30.0,30.0,
+							    {200,50,50,50},
+							    {200,50,50,200}),
+	wxGraphicsContext:setBrush(Canvas, Brush),
+	Font  = wxGraphicsContext:createFont(Canvas, Font0),
+	wxGraphicsContext:setFont(Canvas, Font),
+	
+	wxGraphicsContext:drawRoundedRectangle(Canvas, 35.0,35.0, 100.0, 50.0, 10.0),
+	wxGraphicsContext:drawText(Canvas, "Welcome", 60.0, 55.0),
+	Path = wxGraphicsContext:createPath(Canvas),
+	wxGraphicsPath:addCircle(Path, 0.0, 0.0, 40.0),
+	wxGraphicsPath:closeSubpath(Path),
+	wxGraphicsContext:translate(Canvas, 100.0, 100.0),
+
+	Brush2 = wxGraphicsContext:createLinearGradientBrush(Canvas, 0.0,0.0, 30.0,30.0,
+							     {50,200,50,50},
+							     {50,50,200,50}),
+	wxGraphicsContext:setBrush(Canvas, Brush2),
+	
+	F = fun(_) ->
+		    wxGraphicsContext:scale(Canvas, 1.1, 1.1),
+		    wxGraphicsContext:translate(Canvas, 3.0,3.0),
+		    wxGraphicsContext:drawPath(Canvas, Path)
+	    end,
+	wx:foreach(F, lists:seq(1,5)),
+	ok
+    catch _:{not_supported, _} ->
+	    Err = "wxGraphicsContext not available in this build of wxwidgets",
+	    io:format(Err,[])
+    end.
+
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