%%
%% %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.
