1%%
2%% %CopyrightBegin%
3%%
4%% Copyright Ericsson AB 2009-2016. All Rights Reserved.
5%%
6%% Licensed under the Apache License, Version 2.0 (the "License");
7%% you may not use this file except in compliance with the License.
8%% You may obtain a copy of the License at
9%%
10%%     http://www.apache.org/licenses/LICENSE-2.0
11%%
12%% Unless required by applicable law or agreed to in writing, software
13%% distributed under the License is distributed on an "AS IS" BASIS,
14%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15%% See the License for the specific language governing permissions and
16%% limitations under the License.
17%%
18%% %CopyrightEnd%
19
20-module(ex_graphicsContext).
21
22-behaviour(wx_object).
23
24%% Client API
25-export([start/1]).
26
27%% wx_object callbacks
28-export([init/1, terminate/2,  code_change/3,
29	 handle_info/2, handle_call/3,handle_cast/2,
30	 handle_event/2, handle_sync_event/3]).
31
32-include_lib("wx/include/wx.hrl").
33
34-record(state,
35	{
36	  parent,
37	  config,
38	  win,
39	  pen,
40	  brush,
41	  font
42	}).
43
44start(Config) ->
45    wx_object:start_link(?MODULE, Config, []).
46
47%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
48init(Config) ->
49    wx:batch(fun() -> do_init(Config) end).
50
51do_init(Config) ->
52    Parent = proplists:get_value(parent, Config),
53    Panel = wxPanel:new(Parent, []),
54
55    %% Setup sizers
56    MainSizer = wxBoxSizer:new(?wxVERTICAL),
57    Sizer = wxStaticBoxSizer:new(?wxVERTICAL, Panel,
58				 [{label, "wxGraphicsContext"}]),
59
60    Win = wxPanel:new(Panel, []),
61    Pen = ?wxBLACK_PEN,
62    Brush = wxBrush:new({30, 175, 23, 127}),
63    Font = ?wxITALIC_FONT,
64    wxPanel:connect(Win, paint, [callback]),
65
66    %% Add to sizers
67    wxSizer:add(Sizer, Win, [{flag, ?wxEXPAND},
68				{proportion, 1}]),
69    wxSizer:add(MainSizer, Sizer, [{flag, ?wxEXPAND},
70				   {proportion, 1}]),
71
72    wxPanel:setSizer(Panel, MainSizer),
73    {Panel, #state{parent=Panel, config=Config, win = Win,
74		   pen = Pen, brush = Brush, font = Font}}.
75
76%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
77%% Sync events i.e. from callbacks must return ok, it cannot return a new state.
78%% Do the redrawing here.
79handle_sync_event(#wx{event = #wxPaint{}},_,
80		  #state{win=Win, pen = Pen, brush = Brush, font = Font}) ->
81    %% PaintDC must be created in a callback to work on windows.
82    DC = wxPaintDC:new(Win),
83    %% Nothing is drawn until wxPaintDC is destroyed.
84    draw(DC, Pen, Brush, Font),
85    wxPaintDC:destroy(DC),
86    ok.
87%% Async Events are handled in handle_event as in handle_info
88handle_event(#wx{}, State) ->
89    {noreply, State}.
90
91%% Callbacks handled as normal gen_server callbacks
92handle_info(Msg, State) ->
93    demo:format(State#state.config, "Got Info ~p\n", [Msg]),
94    {noreply, State}.
95
96handle_call(shutdown, _From, State=#state{parent=Panel}) ->
97    wxPanel:destroy(Panel),
98    {stop, normal, ok, State};
99
100handle_call(Msg, _From, State) ->
101    demo:format(State#state.config, "Got Call ~p\n", [Msg]),
102    {reply,{error, nyi}, State}.
103
104handle_cast(Msg, State) ->
105    io:format("Got cast ~p~n",[Msg]),
106    {noreply,State}.
107
108code_change(_, _, State) ->
109    {stop, ignore, State}.
110
111terminate(_Reason, _State) ->
112    ok.
113
114%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
115%% Local functions
116%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
117
118draw(Win, Pen, Brush, Font) ->
119    try
120	Canvas = wxGraphicsContext:create(Win),
121	wxGraphicsContext:setPen(Canvas, Pen),
122	wxGraphicsContext:setBrush(Canvas, Brush),
123	wxGraphicsContext:setFont(Canvas, Font, {0, 0, 50}),
124
125	wxGraphicsContext:drawRoundedRectangle(Canvas, 35.0,35.0, 100.0, 50.0, 10.0),
126	wxGraphicsContext:drawText(Canvas, "This text should be antialised", 60.0, 55.0),
127	Path = wxGraphicsContext:createPath(Canvas),
128	wxGraphicsPath:addCircle(Path, 0.0, 0.0, 40.0),
129	wxGraphicsPath:closeSubpath(Path),
130	wxGraphicsContext:translate(Canvas, 100.0, 250.0),
131
132	F = fun(N) ->
133		    wxGraphicsContext:scale(Canvas, 1.1, 1.1),
134		    wxGraphicsContext:translate(Canvas, 15.0,-1.0*N),
135		    wxGraphicsContext:drawPath(Canvas, Path)
136	    end,
137	wx:foreach(F, lists:seq(1,10)),
138	wxGraphicsObject:destroy(Path),
139	wxGraphicsObject:destroy(Canvas),
140	ok
141    catch _:{not_supported, _} ->
142	    Err = "wxGraphicsContext not available in this build of wxwidgets",
143	    io:format(Err,[])
144    end.
145
146