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Diffstat (limited to 'lib/observer/src/observer_perf_wx.erl')
| -rw-r--r-- | lib/observer/src/observer_perf_wx.erl | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/lib/observer/src/observer_perf_wx.erl b/lib/observer/src/observer_perf_wx.erl new file mode 100644 index 0000000000..0de9785fb9 --- /dev/null +++ b/lib/observer/src/observer_perf_wx.erl @@ -0,0 +1,575 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 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(observer_perf_wx). + +-export([start_link/2]). + +%% wx_object callbacks +-export([init/1, handle_info/2, terminate/2, code_change/3, handle_call/3, + handle_event/2, handle_sync_event/3, handle_cast/2]). + +%% Drawing wrappers for DC and GC areas +-export([haveGC/1, + setPen/2, setFont/3, setBrush/2, + strokeLine/5, strokeLines/2, drawRoundedRectangle/6, + drawText/4, getTextExtent/2]). + +-behaviour(wx_object). +-include_lib("wx/include/wx.hrl"). +-include("observer_defs.hrl"). + +-record(state, + { + offset = 0.0, + active = false, + parent, + windows, + data = {0, queue:new()}, + panel, + paint, + appmon, + usegc = false + }). + +-define(wxGC, wxGraphicsContext). + +-record(paint, {font, small, pen, pen2, pens}). + +-define(RQ_W, 1). +-define(MEM_W, 2). +-define(IO_W, 3). + +start_link(Notebook, Parent) -> + wx_object:start_link(?MODULE, [Notebook, Parent], []). + +init([Notebook, Parent]) -> + try + Panel = wxPanel:new(Notebook), + Main = wxBoxSizer:new(?wxVERTICAL), + Style = ?wxFULL_REPAINT_ON_RESIZE bor ?wxCLIP_CHILDREN, + CPU = wxPanel:new(Panel, [{winid, ?RQ_W}, {style,Style}]), + wxWindow:setBackgroundColour(CPU, ?wxWHITE), + wxSizer:add(Main, CPU, [{flag, ?wxEXPAND bor ?wxALL}, + {proportion, 1}, {border, 5}]), + MemIO = wxBoxSizer:new(?wxHORIZONTAL), + MEM = wxPanel:new(Panel, [{winid, ?MEM_W}, {style,Style}]), + wxWindow:setBackgroundColour(MEM, ?wxWHITE), + IO = wxPanel:new(Panel, [{winid, ?IO_W}, {style,Style}]), + wxWindow:setBackgroundColour(IO, ?wxWHITE), + wxSizer:add(MemIO, MEM, [{flag, ?wxEXPAND bor ?wxLEFT}, + {proportion, 1}, {border, 5}]), + wxSizer:add(MemIO, IO, [{flag, ?wxEXPAND bor ?wxLEFT bor ?wxRIGHT}, + {proportion, 1}, {border, 5}]), + wxSizer:add(Main, MemIO, [{flag, ?wxEXPAND bor ?wxDOWN}, + {proportion, 1}, {border, 5}]), + wxWindow:setSizer(Panel, Main), + + wxPanel:connect(CPU, paint, [callback]), + wxPanel:connect(IO, paint, [callback]), + wxPanel:connect(MEM, paint, [callback]), + case os:type() of + {win32, _} -> %% Ignore erase on windows + wxPanel:connect(CPU, erase_background, [{callback, fun(_,_) -> ok end}]), + wxPanel:connect(IO, erase_background, [{callback, fun(_,_) -> ok end}]), + wxPanel:connect(MEM, erase_background, [{callback, fun(_,_) -> ok end}]); + _ -> ok + end, + + UseGC = haveGC(Panel), + {Font, SmallFont} + = case os:type() of + {unix, _} when UseGC -> + %% Def font is really small when using Graphics contexts for some reason + %% Hardcode it + F = wxFont:new(12,?wxFONTFAMILY_DECORATIVE,?wxFONTSTYLE_NORMAL,?wxFONTWEIGHT_BOLD), + SF = wxFont:new(10, ?wxFONTFAMILY_DECORATIVE, ?wxFONTSTYLE_NORMAL, ?wxFONTWEIGHT_NORMAL), + {F, SF}; + _ -> + DefFont = wxSystemSettings:getFont(?wxSYS_DEFAULT_GUI_FONT), + DefSize = wxFont:getPointSize(DefFont), + DefFamily = wxFont:getFamily(DefFont), + F = wxFont:new(DefSize, DefFamily, ?wxFONTSTYLE_NORMAL, ?wxFONTWEIGHT_BOLD), + SF = wxFont:new(DefSize-1, DefFamily, ?wxFONTSTYLE_NORMAL, ?wxFONTWEIGHT_NORMAL), + {F, SF} + end, + BlackPen = wxPen:new({0,0,0}, [{width, 2}]), + Pens = [wxPen:new(Col, [{width, 2}]) || Col <- tuple_to_list(colors())], + process_flag(trap_exit, true), + {Panel, #state{parent=Parent, + panel =Panel, + windows = {CPU, MEM, IO}, + usegc=UseGC, + paint=#paint{font = Font, + small = SmallFont, + pen = ?wxGREY_PEN, + pen2 = BlackPen, + pens = list_to_tuple(Pens) + } + }} + catch _:Err -> + io:format("~p crashed ~p: ~p~n",[?MODULE, Err, erlang:get_stacktrace()]), + {error, Err} + end. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +handle_event(#wx{event=#wxCommand{type=command_menu_selected}}, + State = #state{}) -> + {noreply, State}; + +handle_event(Event, _State) -> + error({unhandled_event, Event}). + +%%%%%%%%%% +handle_sync_event(#wx{obj=Panel, event = #wxPaint{}},_, + #state{active=Active, offset=Offset, paint=Paint, + windows=Windows, data=Data, usegc=UseGC}) -> + %% PaintDC must be created in a callback to work on windows. + %% Sigh workaround bug on MacOSX (Id in paint event is always 0) + %% Panel = element(Id, Windows), + Id = if Panel =:= element(?RQ_W, Windows) -> ?RQ_W; + Panel =:= element(?MEM_W, Windows) -> ?MEM_W; + Panel =:= element(?IO_W, Windows) -> ?IO_W + end, + IsWindows = element(1, os:type()) =:= win32, + + DC = if IsWindows -> + %% Ugly hack to aviod flickering on windows, works on windows only + %% But the other platforms are doublebuffered by default + wx:typeCast(wxBufferedPaintDC:new(Panel), wxPaintDC); + true -> + wxPaintDC:new(Panel) + end, + IsWindows andalso wxDC:clear(DC), + GC = if UseGC -> ?wxGC:create(DC); + true -> DC + end, + %% Nothing is drawn until wxPaintDC is destroyed. + try + draw(Offset, Id, {UseGC, GC}, Panel, Paint, Data, Active) + catch _:Err -> + io:format("Internal error ~p ~p~n",[Err, erlang:get_stacktrace()]) + end, + UseGC andalso ?wxGC:destroy(GC), + wxPaintDC:destroy(DC), + ok. +%%%%%%%%%% +handle_call(Event, From, _State) -> + error({unhandled_call, Event, From}). + +handle_cast(Event, _State) -> + error({unhandled_cast, Event}). +%%%%%%%%%% +handle_info(Stats = {stats, 1, _, _, _}, + State = #state{panel=Panel, data=Data, active=Active}) -> + if Active -> + wxWindow:refresh(Panel), + Freq = 6, + erlang:send_after(trunc(1000 / Freq), self(), {refresh, 1, Freq}); + true -> ignore + end, + {noreply, State#state{offset=0.0, data = add_data(Stats, Data)}}; + +handle_info({refresh, Seq, Freq}, State = #state{panel=Panel, offset=Prev}) -> + wxWindow:refresh(Panel), + Next = Seq+1, + if Seq > 1, Prev =:= 0.0 -> + %% We didn't have time to handle the refresh + {noreply, State}; + Next < Freq -> + erlang:send_after(trunc(1000 / Freq), self(), {refresh, Next, Freq}), + {noreply, State#state{offset=Seq/Freq}}; + true -> + {noreply, State#state{offset=Seq/Freq}} + end; + +handle_info({active, Node}, State = #state{parent=Parent, panel=Panel, appmon=Old}) -> + create_menus(Parent, []), + try + Node = node(Old), + wxWindow:refresh(Panel), + {noreply, State#state{active=true}} + catch _:_ -> + catch Old ! exit, + Me = self(), + Pid = spawn_link(Node, observer_backend, fetch_stats, [Me, 1000]), + wxWindow:refresh(Panel), + {noreply, State#state{active=true, appmon=Pid, data={0, queue:new()}}} + end; + +handle_info(not_active, State = #state{appmon=_Pid}) -> + %% Pid ! exit, + {noreply, State#state{active=false}}; + +handle_info({'EXIT', Old, _}, State = #state{appmon=Old}) -> + {noreply, State#state{active=false, appmon=undefined}}; + +handle_info(_Event, State) -> + %% io:format("~p:~p: ~p~n",[?MODULE,?LINE,_Event]), + {noreply, State}. + +%%%%%%%%%% +terminate(_Event, #state{appmon=Pid}) -> + catch Pid ! exit, + ok. +code_change(_, _, State) -> + State. + +add_data(Stats, {N, Q}) when N > 60 -> + {N, queue:drop(queue:in(Stats, Q))}; +add_data(Stats, {N, Q}) -> + {N+1, queue:in(Stats, Q)}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +create_menus(Parent, _) -> + MenuEntries = + [{"File", + [ + ]} + ], + observer_wx:create_menus(Parent, MenuEntries). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +collect_data(?RQ_W, {N, Q}) -> + case queue:to_list(Q) of + [] -> {0, 0, []}; + [_] -> {0, 0, []}; + [{stats, _Ver, Init0, _IO, _Mem}|Data0] -> + Init = lists:sort(Init0), + [_|Data=[First|_]] = lists:foldl(fun({stats, _, T0, _, _}, [Prev|Acc]) -> + TN = lists:sort(T0), + Delta = calc_delta(TN, Prev), + [TN, list_to_tuple(Delta)|Acc] + end, [Init], Data0), + {N, lmax(Data), lists:reverse([First|Data])} + end; +collect_data(?MEM_W, {N, Q}) -> + MemT = mem_types(), + Data = [list_to_tuple([Value || {Type,Value} <- MemInfo, + lists:member(Type, MemT)]) + || {stats, _Ver, _RQ, _IO, MemInfo} <- queue:to_list(Q)], + {N, lmax(Data), Data}; +collect_data(?IO_W, {N, Q}) -> + case queue:to_list(Q) of + [] -> {0, 0, []}; + [_] -> {0, 0, []}; + [{stats, _Ver, _RQ, {{_,In0}, {_,Out0}}, _Mem}|Data0] -> + [_,_|Data=[First|_]] = + lists:foldl(fun({stats, _, _, {{_,In}, {_,Out}}, _}, [PIn,Pout|Acc]) -> + [In,Out,{In-PIn,Out-Pout}|Acc] + end, [In0,Out0], Data0), + {N, lmax(Data), lists:reverse([First|Data])} + end. + +mem_types() -> + [total, processes, system, atom, binary, code, ets]. + +lmax([]) -> 0; +lmax(List) -> + lists:max([lists:max(tuple_to_list(T)) || T <- List]). + +calc_delta([{Id, WN, TN}|Ss], [{Id, WP, TP}|Ps]) -> + [100*(WN-WP) div (TN-TP)|calc_delta(Ss, Ps)]; +calc_delta([], []) -> []. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +draw(Offset, Id, DC, Panel, Paint=#paint{pens=Pens, small=Small}, Data, Active) -> + %% This can be optimized a lot by collecting data once + %% and draw to memory and then blit memory and only draw new entries in new memory + %% area. Hmm now rewritten to use ?wxGC I don't now if it is feasable. + {Len, Max0, Hs} = collect_data(Id, Data), + Max = calc_max(Max0), + NoGraphs = try tuple_size(hd(Hs)) catch _:_ -> 0 end, + Size = wxWindow:getClientSize(Panel), + {X0,Y0,WS,HS} = draw_borders(Id, NoGraphs, DC, Size, Max, Paint), + Last = 60*WS+X0-1, + Start = max(61-Len, 0)*WS+X0 - Offset*WS, + case Hs of + [] -> ignore; + [_] -> ignore; + _ -> + Draw = fun(N) -> + Lines = make_lines(Hs, Start, N, {X0,Max*HS,Last}, Y0, WS, HS), + setPen(DC, element(1+ ((N-1) rem tuple_size(Pens)), Pens)), + strokeLines(DC, Lines), + N+1 + end, + [Draw(I) || I <- lists:seq(NoGraphs, 1, -1)] + end, + case Active of + false -> + NotActive = "Service not available", + setFont(DC, Small, {0,0,0}), + drawText(DC, NotActive, X0 + 100, element(2,Size) div 2); + true -> + ignore + end, + ok. + +make_lines(Ds = [Data|_], PX, N, Clip, ZeroY, WS, HS) -> + Y = element(N,Data), + make_lines(Ds, PX, N, Clip, ZeroY, WS, HS, Y, []). + +make_lines([D1 | Ds = [D2|Rest]], PX, N, Clip={Cx,Cy, _}, ZeroY, WS, HS, Y0, Acc0) -> + Y1 = element(N,D1), + Y2 = element(N,D2), + Y3 = case Rest of + [D3|_] -> element(N,D3); + [] -> Y2 + end, + This = {max(Cx, PX),ZeroY-min(Cy,Y1*HS)}, + Acc = if (abs(Y1-Y2) * HS) < 3.0 -> [This|Acc0]; + WS < 3.0 -> [This|Acc0]; + PX < Cx -> + make_splines(Y0,Y1,Y2,Y3,PX,Clip,ZeroY,WS,HS,Acc0); + true -> + make_splines(Y0,Y1,Y2,Y3,PX,Clip,ZeroY,WS,HS,[This|Acc0]) + end, + make_lines(Ds, PX+WS, N, Clip, ZeroY, WS, HS, Y1, Acc); +make_lines([D1], _PX, N, {_,Cy,Last}, ZeroY, _WS, HS, _Y0, Acc) -> + Y1 = element(N,D1), + [{Last,ZeroY-min(Cy, Y1*HS)}|Acc]. + +make_splines(Y00,Y10,Y20,Y30,PX,Clip,ZeroY,WS,HS,Acc) -> + Y1 = Y10*HS, + Y2 = Y20*HS, + Steps = min(abs(Y1-Y2), WS), + if Steps > 2 -> + Y0 = Y00*HS, + Y3 = Y30*HS, + Tan = spline_tan(Y0,Y1,Y2,Y3), + Delta = 1/Steps, + splines(Steps-1, 0.0, Delta, Tan, Y1,Y2, PX, Clip,ZeroY, Delta*WS, Acc); + true -> + Acc + end. + +splines(N, XD, XD0, Tan, Y1,Y2, PX0, Clip={Cx,Cy,_},ZeroY, WS, Acc) when N > 0 -> + PX = PX0+WS, + Delta = XD+XD0, + if PX < Cx -> + splines(N-1, Delta, XD0, Tan, Y1, Y2, PX, Clip,ZeroY, WS, Acc); + true -> + Y = min(Cy, max(0,spline(Delta, Tan, Y1,Y2))), + splines(N-1, Delta, XD0, Tan, Y1, Y2, PX, Clip,ZeroY, WS, + [{PX, ZeroY-Y}|Acc]) + end; +splines(_N, _XD, _XD0, _Tan, _Y1,_Y2, _PX, _Clip,_ZeroY, _WS, Acc) -> Acc. + +spline(T, {M1, M2}, Y1, Y2) -> + %% Hermite Basis Funcs + T2 = T*T, T3 = T*T*T, + H1 = 2*T3-3*T2+1, + H2 = -2*T3+3*T2, + H3 = T3-2*T2+T, + H4 = T3-T2, + %% Result + M1*H3 + Y1*H1 + Y2*H2 + M2*H4. + +spline_tan(Y0, Y1, Y2, Y3) -> + S = 1.0, + C = 0.5, + %% Calc tangent values + M1 = S*C*(Y2-Y0), + M2 = S*C*(Y3-Y1), + {M1,M2}. + +-define(BW, 5). +-define(BH, 5). + +draw_borders(Type, NoGraphs, DC, {W,H}, Max, + #paint{pen=Pen, pen2=Pen2, font=Font, small=Small}) -> + {Unit, MaxUnit} = bytes(Type, Max), + Str1 = observer_lib:to_str(MaxUnit), + Str2 = observer_lib:to_str(MaxUnit div 2), + Str3 = observer_lib:to_str(0), + + setFont(DC, Font, {0,0,0}), + {TW,TH} = getTextExtent(DC, Str1), + {SpaceW, _} = getTextExtent(DC, "W"), + + GraphX0 = ?BW+TW+?BW, + GraphX1 = W-?BW*4, + TopTextX = ?BW+TW+?BW, + MaxTextY = ?BH+TH+?BH, + BottomTextY = H-?BH-TH, + SecondsY = BottomTextY - ?BH - TH, + GraphY0 = MaxTextY + (TH / 2), + GraphY1 = SecondsY - ?BH, + GraphW = GraphX1-GraphX0-1, + GraphH = GraphY1-GraphY0-1, + GraphY25 = GraphY0 + (GraphY1 - GraphY0) / 4, + GraphY50 = GraphY0 + (GraphY1 - GraphY0) / 2, + GraphY75 = GraphY0 + 3*(GraphY1 - GraphY0) / 4, + ScaleW = GraphW / 60, + ScaleH = GraphH / Max, + + setFont(DC, Small, {0,0,0}), + Align = fun(Str, Y) -> + {StrW, _} = getTextExtent(DC, Str), + drawText(DC, Str, GraphX0 - StrW - ?BW, Y) + end, + Align(Str1, MaxTextY), + Align(Str2, GraphY50 - (TH / 2)), + Align(Str3, GraphY1 - (TH / 2) + 1), + + setPen(DC, Pen), + DrawSecs = fun(Secs, Pos) -> + Str = [observer_lib:to_str(Secs)|" s"], + X = GraphX0+Pos, + drawText(DC, Str, X-SpaceW, SecondsY), + strokeLine(DC, X, GraphY0, X, GraphY1+5), + Pos + 10*ScaleW + end, + lists:foldl(DrawSecs, 0, lists:seq(60,0, -10)), + + strokeLine(DC, GraphX0-3, GraphY25, GraphX1, GraphY25), + strokeLine(DC, GraphX0-3, GraphY50, GraphX1, GraphY50), + strokeLine(DC, GraphX0-3, GraphY75, GraphX1, GraphY75), + + setPen(DC, Pen2), + strokeLines(DC, [{GraphX0, GraphY0-1}, {GraphX0, GraphY1+1}, + {GraphX1, GraphY1+1}, {GraphX1, GraphY0-1}, + {GraphX0, GraphY0-1}]), + + setFont(DC, Font, {0,0,0}), + case Type of + ?RQ_W -> drawText(DC, "Scheduler Utilization (%) ", TopTextX,?BH); + ?MEM_W -> drawText(DC, "Memory Usage " ++ Unit, TopTextX,?BH); + ?IO_W -> drawText(DC, "IO Usage " ++ Unit, TopTextX,?BH) + end, + + Text = fun(X,Y, Str, PenId) -> + if PenId == 0 -> + setFont(DC, Font, {0,0,0}); + PenId > 0 -> + Id = 1 + ((PenId-1) rem tuple_size(colors())), + setFont(DC, Font, element(Id, colors())) + end, + drawText(DC, Str, X, Y), + {StrW, _} = getTextExtent(DC, Str), + StrW + X + SpaceW + end, + case Type of + ?RQ_W -> + TN0 = Text(?BW, BottomTextY, "Scheduler: ", 0), + lists:foldl(fun(Id, Pos0) -> + Text(Pos0, BottomTextY, integer_to_list(Id), Id) + end, TN0, lists:seq(1, NoGraphs)); + ?MEM_W -> + lists:foldl(fun(MType, {PenId, Pos0}) -> + Str = uppercase(atom_to_list(MType)), + Pos = Text(Pos0, BottomTextY, Str, PenId), + {PenId+1, Pos} + end, {1, ?BW}, mem_types()); + ?IO_W -> + TN0 = Text(?BW, BottomTextY, "Input", 1), + Text(TN0, BottomTextY, "Output", 2) + end, + {GraphX0+1, GraphY1, ScaleW, ScaleH}. + +uppercase([C|Rest]) -> + [C-$a+$A|Rest]. + +calc_max(Max) when Max < 10 -> 10; +calc_max(Max) -> calc_max1(Max). + +calc_max1(Max) -> + case Max div 10 of + X when X < 10 -> + case Max rem 10 of + 0 -> Max; + _ -> + (X+1)*10 + end; + X -> + 10*calc_max1(X) + end. + +bytes(?RQ_W, Val) -> {"", Val}; +bytes(_, B) -> + KB = B div 1024, + MB = KB div 1024, + GB = MB div 1024, + if + GB > 10 -> {"(GB)", GB}; + MB > 10 -> {"(MB)", MB}; + KB > 0 -> {"(KB)", KB}; + true -> {"(B)", B} + end. + +colors() -> + {{200, 50, 50}, {50, 200, 50}, {50, 50, 200}, + {255, 110, 0}, {50, 200, 200}, {200, 50, 200}, + {240, 200, 80}, {140, 2, 140}, + {100, 200, 240}, {100, 240, 100} + }. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% wxDC and ?wxGC wrappers + +haveGC(Win) -> + try + GC = ?wxGC:create(Win), + ?wxGC:destroy(GC), + true + catch _:_ -> false + end. + +setPen({false, DC}, Pen) -> + wxDC:setPen(DC, Pen); +setPen({true, GC}, Pen) -> + ?wxGC:setPen(GC, Pen). + +setFont({false, DC}, Font, Color) -> + wxDC:setTextForeground(DC, Color), + wxDC:setFont(DC, Font); +setFont({true, GC}, Font, Color) -> + ?wxGC:setFont(GC, Font, Color). + +setBrush({false, DC}, Brush) -> + wxDC:setBrush(DC, Brush); +setBrush({true, GC}, Brush) -> + ?wxGC:setBrush(GC, Brush). + +strokeLine({false, DC}, X0, Y0, X1, Y1) -> + wxDC:drawLine(DC, {round(X0), round(Y0)}, {round(X1), round(Y1)}); +strokeLine({true, GC}, X0, Y0, X1, Y1) -> + ?wxGC:strokeLine(GC, X0, Y0, X1, Y1). + +strokeLines({false, DC}, Lines) -> + wxDC:drawLines(DC, [{round(X), round(Y)} || {X,Y} <- Lines]); +strokeLines({true, GC}, Lines) -> + ?wxGC:strokeLines(GC, Lines). + +drawRoundedRectangle({false, DC}, X0, Y0, X1, Y1, R) -> + wxDC:drawRoundedRectangle(DC, {round(X0), round(Y0)}, {round(X1), round(Y1)}, round(R)); +drawRoundedRectangle({true, GC}, X0, Y0, X1, Y1, R) -> + ?wxGC:drawRoundedRectangle(GC, X0, Y0, X1, Y1, R). + +drawText({false, DC}, Str, X, Y) -> + wxDC:drawText(DC, Str, {round(X),round(Y)}); +drawText({true, GC}, Str, X, Y) -> + ?wxGC:drawText(GC, Str, X, Y). + +getTextExtent({false, DC}, Str) -> + wxDC:getTextExtent(DC, Str); +getTextExtent({true, GC}, Str) -> + {W,H,_,_} = ?wxGC:getTextExtent(GC, Str), + {W,H}. |