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diff --git a/lib/gs/src/gstk_font.erl b/lib/gs/src/gstk_font.erl
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-%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 1996-2016. 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%
-%%
-
-%%
-%%% Purpose : The font model
-
-%% ###########################################################################
-%%
-%% This module handle fonts. It was changed for Tcl 8.2 but it could
-%% probably be simplified more.
-%%
-%% In Tcl 8.2 we can use named fonts. So the whe get a font request we
-%% first check if it already exists and if not we name it and insert it
-%% into the database.
-%%
-%% The font naming is also changedin Tcl 8.2.
-%%
-%% In Tcl 8.2 there is a way to find out the width of a string in
-%% a specified font.
-%%
-%% ###########################################################################
-
--module(gstk_font).
-
-%-compile(export_all).
-
--export([init/0,choose_ascii/2,choose/2,width_height/3]).
-
-
--ifndef(NEW_WIDTH_HEIGHT).
-init() ->
- %% hack. the only way to find the size of a text seems to be to put
- %% it into a label in an unmappen window (DummyFontWindow)
- gstk:exec("toplevel .dfw;wm withdraw .dfw;" %deiconify
- "label .dfw.l -text dummyinittxt -padx 0 -pady 0 -borderwidth 0;"
- "pack .dfw.l").
--else.
-init() -> true.
--endif.
-
-%%----------------------------------------------------------------------
-%% Returns: undefined if font doesn't exist
-%% {WidthPixels, HeightPixels}
-%%----------------------------------------------------------------------
--ifndef(NEW_WIDTH_HEIGHT).
-width_height(_DB, FontSpec, Txt) ->
- FontSpecStr = tk_font_spec(norm_font_spec(FontSpec)),
- case gstk:call([".dfw.l co -font {", FontSpecStr,"}",
- " -text ", gstk:to_ascii(Txt)]) of
- {result, _} ->
- Width = tcl2erl:ret_int("update idletasks;winfo w .dfw.l"),
- Height = tcl2erl:ret_int("winfo h .dfw.l"),
-% io:format("width_height(~p,~p) =>\n~p\n\n",[FontSpec,Txt,{Width,Height}]),
- {Width,Height};
- _Bad_Result ->
-% io:format("width_height(~p,~p) =>\nundefined\n\n",[FontSpec,Txt]),
- undefined
- end.
--else.
-%% This code should work but does't. Tk gives incorrect
-%% values if asking to fast or something /kent
-width_height(DB, FontSpec, Txt) when tuple(FontSpec) ->
- NormFontSpec = norm_font_spec(FontSpec),
- FontSpecStr = tk_font_spec(NormFontSpec),
- {Family,_,Size} = NormFontSpec,
- LineHeight =
- case cached_line_height(DB, {Family,Size}) of
- undefined ->
- LineH = tcl2erl:ret_int(
- ["font metrics {",FontSpecStr,"} -linespace"]),
- cache_line_height(DB, {Family,Size}, LineH),
- LineH;
- LineH ->
- LineH
- end,
- EscapedText = gstk:to_ascii(Txt),
- Width = tcl2erl:ret_int(
- ["font measure {",FontSpecStr,"} ",EscapedText]),
- Height = LineHeight * line_count(Txt),
- {Width,Height};
-
-width_height(_DB, FontSpec, Txt) when list(FontSpec) ->
- EscapedText = gstk:to_ascii(Txt),
- Width =
- tcl2erl:ret_int(["font measure {",FontSpec,"} ",EscapedText]),
- LineHeight =
- tcl2erl:ret_int(["font metrics {",FontSpec,"} -linespace"]),
- Height = LineHeight * line_count(Txt),
- {Width,Height}.
-
-cached_line_height(DB,FontSpec) ->
- gstk_db:lookup(DB, {cached_line_height,FontSpec}).
-
-cache_line_height(DB,FontSpec,Size) ->
- gstk_db:insert(DB, {cached_line_height,FontSpec}, Size).
-
-line_count(Line) ->
- line_count(Line, 1).
-
-line_count([H | T], Count) ->
- Count + line_count(H, 0) + line_count(T, 0);
-line_count($\n, Count) -> Count + 1;
-line_count(Char, Count) when integer(Char) -> Count;
-line_count([], Count) -> Count.
--endif.
-
-% "expr [font metrics ",FSpec," -linespace] * \
-% [regsub -all \\n ",Txt," {} ignore]"
-
-%%----------------------------------------------------------------------
-%% Returns: Font specification string in Tk format
-%%
-%% The input is {Family,Size} or {Family,Style,Size} where Family and
-%% Style are atoms ?! FIXME true???
-%%----------------------------------------------------------------------
-choose_ascii(DB, Font) ->
- {Fam,Styl,Siz} = choose(DB, Font),
- {variable,V} =gstk_db:lookup(DB,{font,Fam,Styl,Siz}),
-% io:format("choose_ascii(~p) =>\n~p\n\n",[Font,V]),
- V.
-
-%% DB contains: {font,Fam,Style,Size} -> {replaced_by,{font,Fam,Style,Size}} or
-%% {variable, TkVariableStrInclDollar}
-
-%% ###########################################################################
-%%
-%% We create a new font name on the other side and store the name in the
-%% database. We reorder the options so that they have a predefined order.
-%%
-%% ###########################################################################
-
-choose(DB, FontSpec) ->
- choose_font(DB, norm_font_spec(FontSpec)).
-
-choose_font(DB, {Fam,Styl,Siz}) ->
- Fam0 = map_family(Fam),
- case gstk_db:lookup(DB,{font,Fam0,Styl,Siz}) of
- {variable,_OwnFontName} -> true;
- undefined ->
- N = gstk_db:counter(DB,font), % FIXME: Can use "font create"
- % without name to get unique name
- NewName=["f",gstk:to_ascii(N)],
-% io:format("~s\n\n",
-% [lists:flatten(["font create ",NewName," ",
-% tk_font_spec({Fam0,Styl,Siz})])]),
- gstk:exec(["font create ",NewName," ",
- tk_font_spec({Fam0,Styl,Siz})]),
- %% should us variable syntax gs(f1) instead
- %% have to recompile erlcall to define this global gs var
- V2 = {variable,NewName},
- gstk_db:insert(DB,{font,Fam0,Styl,Siz},V2),
- true
- end,
-% io:format("choose(~p,~p,~p) =>\n~p\n\n",[Fam,Styl,Siz,{Fam0,Styl,Siz}]),
- {Fam0,Styl,Siz}.
-
-
-%% ----- The Font Model -----
-
-%% Guaranteed system fonts to exists in Tk 8.2 are:
-%%
-%% Windows : system systemfixed ansi ansifixed device oemfixed
-%% Unix : fixed
-%%
-%% Times, Courier and Helvetica always exists. Tk try to substitute
-%% others with the best matchin font.
-
-%% We map GS font style and names to something we know Tk 8 have.
-%% We know Tk have 'times', 'courier', 'helvetica' and 'fixed'.
-%%
-%% GS style specification is 'bold' or 'italic'.
-%% GS family is a typeface of type 'times', 'courier', 'helvetica',
-%% 'symbol', 'new_century_schoolbook', or 'screen' (which is a suitable
-%% screen font).
-%%
-%% Note that 'symbol' may not be present and this is not handled.
-%%
-%% The X/Tk8 font handling don't work very well. The fonts are
-%% scaled "tk scaling", we can display a 9 and 10 point helvetica
-%% but "font actual {helvetica 9}" will return 10 points....
-
-map_family(new_century_schoolbook) ->
- times;
-map_family(Fam) ->
- Fam.
-
-% Normalize so can make the coding easier and compare font
-% specifications stored in database with new ones. We ignore invalid
-% entries in the list.
-
-norm_font_spec({Family,Size}) ->
- {Family,[],Size};
-norm_font_spec({Family,Style,Size}) ->
- {Family,norm_style(Style),Size}.
-
-norm_style(bold) ->
- [bold];
-norm_style(italic) ->
- [italic];
-norm_style([italic]) ->
- [italic];
-norm_style([bold]) ->
- [bold];
-norm_style([bold,italic] = Style) ->
- Style;
-norm_style([italic,bold]) ->
- [bold,italic];
-norm_style(List) when is_list(List) -> % not well formed list, ignore garbage
- case {lists:member(bold, List),lists:member(italic, List)} of
- {true,true} ->
- [bold,italic];
- {true,_} ->
- [bold];
- {_,true} ->
- [italic];
- _ ->
- [] % ignore garbage
- end;
-norm_style(_Any) -> % ignore garbage
- [].
-
-
-% Create a tcl string from a normalized font specification
-% The style list is normalized.
-
-tk_font_spec({Fam,Style,Size}) ->
- ["-family ",gstk:to_ascii(Fam),
- " -size ",gstk:to_ascii(-Size),
- tk_font_spec_style(Style)].
-
-tk_font_spec_style([]) ->
- "";
-tk_font_spec_style([bold]) ->
- " -weight bold";
-tk_font_spec_style([italic]) ->
- " -slant italic";
-tk_font_spec_style([bold,italic]) ->
- " -weight bold -slant italic".
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 22:49:09 +0000