%%
%% %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_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}) ->
case W > 0 andalso H > 0 of
true ->
wxBitmap:destroy(Prev),
Bitmap = wxBitmap:new(W,H),
draw(State#state.canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end),
{noreply, State#state{bitmap=Bitmap}};
false ->
{noreply, State}
end;
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(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, _) ->
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}.
