%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2009. 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_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_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, "wxGrapicsContext"}]),
Win = wxPanel:new(Panel, []),
Pen = wxPen:new(),
Brush = wxBrush:new(?wxBLACK),
Font = wxFont:new(),
wxFont:setWeight(Font, ?wxBOLD),
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 can not 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(Msg, _From, State) ->
demo:format(State#state.config, "Got Call ~p\n", [Msg]),
{reply,{error, nyi}, State}.
code_change(_, _, State) ->
{stop, ignore, State}.
terminate(_Reason, _State) ->
ok.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Local functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
draw(Win, Pen0, _Brush0, Font0) ->
try
Canvas = wxGraphicsContext:create(Win),
Pen = wxGraphicsContext:createPen(Canvas, Pen0),
wxGraphicsContext:setPen(Canvas, Pen),
Brush = wxGraphicsContext:createLinearGradientBrush(Canvas, 0.0,0.0, 30.0,30.0,
{200,50,50,50},
{200,50,50,200}),
wxGraphicsContext:setBrush(Canvas, Brush),
Font = wxGraphicsContext:createFont(Canvas, Font0),
wxGraphicsContext:setFont(Canvas, Font),
wxGraphicsContext:drawRoundedRectangle(Canvas, 35.0,35.0, 100.0, 50.0, 10.0),
wxGraphicsContext:drawText(Canvas, "Welcome", 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, 100.0),
Brush2 = wxGraphicsContext:createLinearGradientBrush(Canvas, 0.0,0.0, 30.0,30.0,
{50,200,50,50},
{50,50,200,50}),
wxGraphicsContext:setBrush(Canvas, Brush2),
F = fun(_) ->
wxGraphicsContext:scale(Canvas, 1.1, 1.1),
wxGraphicsContext:translate(Canvas, 3.0,3.0),
wxGraphicsContext:drawPath(Canvas, Path)
end,
wx:foreach(F, lists:seq(1,5)),
ok
catch _:{not_supported, _} ->
Err = "wxGraphicsContext not available in this build of wxwidgets",
io:format(Err,[])
end.
