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Diffstat (limited to 'lib/wx/examples/demo/ex_canvas.erl')
| -rw-r--r-- | lib/wx/examples/demo/ex_canvas.erl | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/lib/wx/examples/demo/ex_canvas.erl b/lib/wx/examples/demo/ex_canvas.erl new file mode 100644 index 0000000000..844c7eddf3 --- /dev/null +++ b/lib/wx/examples/demo/ex_canvas.erl @@ -0,0 +1,177 @@ +%% +%% %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_canvas). + +-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, + canvas, + 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, "Various shapes"}]), + + Button = wxButton:new(Panel, ?wxID_ANY, [{label, "Redraw"}]), + + Canvas = wxPanel:new(Panel, [{style, ?wxFULL_REPAINT_ON_RESIZE}]), + + wxPanel:connect(Canvas, paint, [callback]), + wxPanel:connect(Canvas, size), + wxPanel:connect(Button, command_button_clicked), + + %% Add to sizers + wxSizer:add(Sizer, Button, [{border, 5}, {flag, ?wxALL}]), + wxSizer:addSpacer(Sizer, 5), + wxSizer:add(Sizer, Canvas, [{flag, ?wxEXPAND}, + {proportion, 1}]), + + wxSizer:add(MainSizer, Sizer, [{flag, ?wxEXPAND}, + {proportion, 1}]), + + wxPanel:setSizer(Panel, MainSizer), + wxSizer:layout(MainSizer), + + {W,H} = wxPanel:getSize(Canvas), + Bitmap = wxBitmap:new(erlang:max(W,30),erlang:max(30,H)), + + {Panel, #state{parent=Panel, config=Config, + canvas = Canvas, 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. + +%% Async Events are handled in handle_event as in handle_info +handle_event(#wx{event = #wxCommand{type = command_button_clicked}}, + State = #state{}) -> + Image = wxImage:new("image.jpg"), + Image2 = wxImage:scale(Image, wxImage:getWidth(Image) div 3, + wxImage:getHeight(Image) div 3), + Bmp = wxBitmap:new(Image2), + wxImage:destroy(Image), + wxImage:destroy(Image2), + {W,H} = wxPanel:getSize(State#state.canvas), + Positions = lists:map(fun(_) -> + get_pos(W,H) + end, lists:seq(1,(W+H) div 20)), + Fun = fun(DC) -> + wxDC:clear(DC), + lists:foreach(fun({X,Y}=Pos) -> + wxDC:setBrush(DC, ?wxTRANSPARENT_BRUSH), + wxDC:setPen(DC, wxPen:new(?wxBLACK, [{width, 2}])), + case X rem 6 of + 0 -> wxDC:drawBitmap(DC, Bmp, Pos); + 1 -> wxDC:setBrush(DC, ?wxRED_BRUSH), + wxDC:drawRectangle(DC, Pos, {20,20}); + 2 -> wxDC:setBrush(DC, ?wxBLUE_BRUSH), + wxDC:drawCircle(DC, {X+10, Y+10}, 15); + 3 -> wxDC:setPen(DC, wxPen:new({200,200,0,255}, [{width, 4}])), + wxDC:drawLine(DC, Pos, get_pos(W,H)); + 4 -> wxDC:setBrush(DC, ?wxGREEN_BRUSH), + wxDC:drawEllipse(DC, Pos, {60,20}); + _ -> wxDC:drawLabel(DC, "Erlang /", {X,Y,60,20}), + wxDC:drawRotatedText(DC, "OTP", {X+60,Y}, 340.0) + end + end, Positions) + end, + draw(State#state.canvas, State#state.bitmap, Fun), + wxBitmap:destroy(Bmp), + {noreply, State}; +handle_event(#wx{event = #wxSize{size={W,H}}}, + State = #state{bitmap=Prev}) -> + Bitmap = wxBitmap:new(W,H), + draw(State#state.canvas, Bitmap, fun(DC) -> wxDC:clear(DC) end), + wxBitmap:destroy(Prev), + {noreply, State#state{bitmap = Bitmap}}; +handle_event(Ev = #wx{}, State = #state{}) -> + demo:format(State#state.config, "Got Event ~p\n", [Ev]), + {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 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +%% Buffered makes it all appear on the screen at the same time +draw(Canvas, Bitmap, Fun) -> + MemoryDC = wxMemoryDC:new(Bitmap), + Fun(MemoryDC), + + CDC = wxWindowDC:new(Canvas), + wxDC:blit(CDC, {0,0}, + {wxBitmap:getWidth(Bitmap), wxBitmap:getHeight(Bitmap)}, + MemoryDC, {0,0}), + wxWindowDC:destroy(CDC), + wxMemoryDC:destroy(MemoryDC). + +redraw(DC, Bitmap) -> + MemoryDC = wxMemoryDC:new(Bitmap), + wxDC:blit(DC, {0,0}, + {wxBitmap:getWidth(Bitmap), wxBitmap:getHeight(Bitmap)}, + MemoryDC, {0,0}), + wxMemoryDC:destroy(MemoryDC). + +get_pos(W,H) -> + {random:uniform(W), random:uniform(H)}. |