1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2009-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions 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_cast/2,
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, "wxGraphicsContext"}]),
Win = wxPanel:new(Panel, []),
Pen = ?wxBLACK_PEN,
Brush = wxBrush:new({30, 175, 23, 127}),
Font = ?wxITALIC_FONT,
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 cannot 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(shutdown, _From, State=#state{parent=Panel}) ->
wxPanel:destroy(Panel),
{stop, normal, ok, State};
handle_call(Msg, _From, State) ->
demo:format(State#state.config, "Got Call ~p\n", [Msg]),
{reply,{error, nyi}, State}.
handle_cast(Msg, State) ->
io:format("Got cast ~p~n",[Msg]),
{noreply,State}.
code_change(_, _, State) ->
{stop, ignore, State}.
terminate(_Reason, _State) ->
ok.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Local functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
draw(Win, Pen, Brush, Font) ->
try
Canvas = wxGraphicsContext:create(Win),
wxGraphicsContext:setPen(Canvas, Pen),
wxGraphicsContext:setBrush(Canvas, Brush),
wxGraphicsContext:setFont(Canvas, Font, {0, 0, 50}),
wxGraphicsContext:drawRoundedRectangle(Canvas, 35.0,35.0, 100.0, 50.0, 10.0),
wxGraphicsContext:drawText(Canvas, "This text should be antialised", 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, 250.0),
F = fun(N) ->
wxGraphicsContext:scale(Canvas, 1.1, 1.1),
wxGraphicsContext:translate(Canvas, 15.0,-1.0*N),
wxGraphicsContext:drawPath(Canvas, Path)
end,
wx:foreach(F, lists:seq(1,10)),
wxGraphicsObject:destroy(Path),
wxGraphicsObject:destroy(Canvas),
ok
catch _:{not_supported, _} ->
Err = "wxGraphicsContext not available in this build of wxwidgets",
io:format(Err,[])
end.
|
