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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2009-2012. 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_canvas_paint).
-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,
canvas,
pen,
brush,
old_pos,
bitmap
}).
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, "wxDC"}]),
%% Create the window to paint on and make it repaint the whole window on resize
Canvas = wxPanel:new(Panel, [{style, ?wxFULL_REPAINT_ON_RESIZE}]),
wxPanel:setToolTip(Canvas,
"Left-click and hold to draw something - release to stop drawing.\n"
"Middle-click to fill with pink\n"
"Middle-dclick to fill with white.\n"
"Right-click to clear."),
%% Create a wxPen and a WxBrush and set its colors to draw with
Brush = wxBrush:new(?wxWHITE),
Pen = wxPen:new(?wxBLACK, [{width, 2}]),
PrintButton = wxButton:new(Panel, ?wxID_ANY, [{label, "Print"}]),
Bitmap = wxBitmap:new(30,30),
%% Add to sizers
wxSizer:add(Sizer, Canvas, [{flag, ?wxEXPAND},
{proportion, 1}]),
wxSizer:add(MainSizer, PrintButton, []),
wxSizer:add(MainSizer, Sizer, [{flag, ?wxEXPAND},
{proportion, 1}]),
wxPanel:connect(PrintButton, command_button_clicked),
wxPanel:connect(Canvas, paint, [callback]),
wxPanel:connect(Canvas, size),
wxPanel:connect(Canvas, left_down),
wxPanel:connect(Canvas, left_dclick),
wxPanel:connect(Canvas, left_up),
wxPanel:connect(Canvas, right_down),
wxPanel:connect(Canvas, middle_down),
wxPanel:connect(Canvas, middle_dclick),
wxPanel:setSizer(Panel, MainSizer),
wxSizer:layout(MainSizer),
{Panel, #state{parent=Panel, config=Config,
canvas = Canvas, pen = Pen,
brush = Brush, bitmap = Bitmap}}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Sync event from callback events, paint event must be handled in callbacks
%% otherwise nothing will be drawn on windows.
handle_sync_event(#wx{event = #wxPaint{}}, _wxObj, #state{canvas=Canvas, bitmap=Bitmap}) ->
DC = wxPaintDC:new(Canvas),
redraw(DC, Bitmap),
wxPaintDC:destroy(DC),
ok.
%% Print what's drawn
handle_event(#wx{event = #wxCommand{type = command_button_clicked}},
State = #state{bitmap=Bitmap}) ->
PD = wxPrintData:new(),
PDD = wxPrintDialogData:new(PD),
PSDD = wxPageSetupDialogData:new(PD),
Fun =
fun(This,_Page) ->
MX = MY = 500,
wxPrintout:fitThisSizeToPageMargins(This, {MX,MY}, PSDD),
{_X,_Y,W,H} = wxPrintout:getLogicalPageMarginsRect(This, PSDD),
wxPrintout:offsetLogicalOrigin(This,(W-MX) div 2, (H-MY) div 2),
DC = wxPrintout:getDC(This),
redraw(DC, Bitmap),
true
end,
Printout1 = wxPrintout:new("Print", Fun,
[{getPageInfo, fun getPageInfo/1}]),
Printout2 = wxPrintout:new("Print", Fun,
[{getPageInfo, fun getPageInfo/1}]),
Preview = wxPrintPreview:new(Printout1, [{printoutForPrinting,Printout2},{data,PDD}]),
case wxPrintPreview:isOk(Preview) of
true ->
Env = wx:get_env(),
spawn_link(fun() ->
wx:set_env(Env),
PF = wxPreviewFrame:new(Preview, State#state.parent, []),
wxPreviewFrame:centre(PF, [{dir, ?wxBOTH}]),
wxPreviewFrame:initialize(PF),
wxPreviewFrame:centre(PF),
wxPreviewFrame:show(PF)
end);
false ->
io:format("Could not create preview window.\n"
"Perhaps your current printer is not set correctly?~n", []),
wxPrintPreview:destroy(Preview)
end,
{noreply, State#state{}};
%% Draw a line
handle_event(#wx{event = #wxMouse{type = motion, x = X, y = Y}},
State = #state{canvas = Canvas, pen = Pen, brush = Brush}) ->
Fun =
fun(DC) ->
wxDC:setPen(DC, Pen),
wxBrush:setColour(Brush, ?wxBLACK),
wxDC:setBrush(DC, Brush),
wxDC:drawLine(DC, {X,Y}, State#state.old_pos)
end,
draw(Canvas,State#state.bitmap, Fun),
{noreply, State#state{old_pos = {X,Y}}};
%% Resize event
handle_event(#wx{event = #wxSize{size = {W,H}}}, State = #state{bitmap=Prev}) ->
wxBitmap:destroy(Prev),
Bitmap = wxBitmap:new(W,H),
draw(State#state.canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end),
{noreply, State#state{bitmap=Bitmap}};
handle_event(#wx{event = #wxMouse{type = left_dclick,x = X,y = Y}}, State = #state{}) ->
wxPanel:connect(State#state.canvas, motion),
{noreply, State#state{old_pos = {X,Y}}};
handle_event(#wx{event = #wxMouse{type = left_down,x = X,y = Y}}, State = #state{}) ->
wxPanel:connect(State#state.canvas, motion),
{noreply, State#state{old_pos = {X,Y}}};
%% Fill with pink color
handle_event(#wx{event = #wxMouse{type = middle_down,x = X, y =Y}}, State = #state{}) ->
case os:type() of
{_, darwin} ->
io:format("Fill doesn't work on Darwin ~n",[]);
_ ->
ok
end,
Fun =
fun(DC) ->
wxBrush:setColour(State#state.brush, {255,125,255,255}),
wxDC:setBrush(DC, State#state.brush),
wxDC:floodFill(DC, {X,Y}, ?wxBLACK, [{style, ?wxFLOOD_BORDER}])
end,
draw(State#state.canvas, State#state.bitmap, Fun),
{noreply, State};
%% Fill with white color
handle_event(#wx{event = #wxMouse{type = middle_dclick,x = X, y =Y}}, State = #state{}) ->
Fun =
fun(DC) ->
wxBrush:setColour(State#state.brush, ?wxWHITE),
wxDC:setBrush(DC, State#state.brush),
wxDC:floodFill(DC, {X,Y}, ?wxBLACK, [{style, ?wxFLOOD_BORDER}])
end,
draw(State#state.canvas, State#state.bitmap,Fun),
{noreply, State};
handle_event(#wx{event = #wxMouse{type = left_up}}, State = #state{}) ->
wxPanel:disconnect(State#state.canvas, motion),
{noreply, State};
%% Clear the DC
handle_event(#wx{event = #wxMouse{type = right_down}}, State = #state{}) ->
draw(State#state.canvas, State#state.bitmap, fun(DC) -> wxDC:clear(DC) end),
{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}.
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(Canvas, Bitmap, Fun) ->
MemoryDC = wxMemoryDC:new(Bitmap),
CDC = wxClientDC:new(Canvas),
Fun(MemoryDC),
wxDC:blit(CDC, {0,0},
{wxBitmap:getWidth(Bitmap), wxBitmap:getHeight(Bitmap)},
MemoryDC, {0,0}),
wxClientDC:destroy(CDC),
wxMemoryDC:destroy(MemoryDC).
redraw(DC, Bitmap) ->
try
MemoryDC = wxMemoryDC:new(Bitmap),
wxDC:blit(DC, {0,0},
{wxBitmap:getWidth(Bitmap), wxBitmap:getHeight(Bitmap)},
MemoryDC, {0,0}),
wxMemoryDC:destroy(MemoryDC)
catch error:{{badarg,_},_} -> %% Bitmap have been deleted
ok
end.
getPageInfo(_This) ->
{1,1,1,1}.
|
