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% MetaUtil, an easier MetaPost life
% Copyright (C) 2005 Ovidiu Gheorghies
%
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License
% as published by the Free Software Foundation; either version 2
% of the License, or (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
if known _util_positioning_mp:
expandafter endinput
fi;
_util_positioning_mp:=1;
input util_log;
%% Gives a point which is below the given @point with the given @value.
%%
def below(expr point, value) =
(point - (0, value))
enddef;
%% Gives a point which is above the given @point with the given @value.
%%
def above(expr point, value) =
(point + (0, value))
enddef;
%% Gives a point which is at the right of the given @point with the given @value.
%%
def atright(expr point, value) =
(point + (value, 0))
enddef;
%% Gives a point which is at the left of the given @point with the given @value.
%%
def atleft(expr point, value) =
(point - (value, 0))
enddef;
%% Positions the given objects so that they:
%% * have their tops alligned
%% * the distance between the objects is @distance
%% * the center of gravity of the objects (taken on the top line) is at @middlePoint
%%
%% @distance
%% |---------------------------|
%% | |
%% | @middlePoint |
%% __________|_____________._____________|____________ the same top
%% [objectA] | [objectB]
%%
vardef centered_allign_top(suffix objectA, objectB)(expr distance, middlePoint)=
log middlePoint;
objectA.top = objectB.top;
objectB.left - objectA.right = distance;
middlePoint = .5[objectB.nw, objectA.ne];
enddef;
%% theString means here not a sequence of characters but
%% the horizontal or vertical line on which objects are placed.
%% For example, if theString is top, then the objects are
%% "hanging" on a horizontal line, like freshly washed
%% clothes on a string.
vardef allign(suffix theString, extremityNew, extremityOld)
(text distanceBetweenObjects)(expr sign)(text objects)=
string objectsAsString__;
objectsAsString__ := enumToString(objects)("");
log "Alligning '" & objectsAsString__ & "' at " & str theString;
log sign;
if (objectsAsString__ = ""):
log "Nothing to do, bailing out.";
else:
string previousObject__;
previousObject__ := "";
objectIndex__ := 0;
forsuffixes obj = objects:
log "object: " & str obj;
if objectIndex__ = 0:
objectIndex__ := objectIndex__ + 1;
previousObject__ := str obj;
else:
objectIndex__ := objectIndex__ + 1;
log str theString;
log str extremityOld;
log str extremityNew;
log distanceBetweenObjects;
string eqA__, eqB__;
eqA__ := previousObject__ & "." & str theString & " = " & str obj & "." & str theString;
if (sign = "+"):
eqB__ := previousObject__ & "." & str extremityOld & " + " & (str distanceBetweenObjects) & " = " & str obj & "." & str extremityNew;
%eqB__ := previousObject__ & "." & str extremityOld & " + distanceBetweenObjects = " & str obj & "." & str extremityNew;
else:
eqB__ := previousObject__ & "." & str extremityOld & " - " & (str distanceBetweenObjects) & " = " & str obj & "." & str extremityNew;
fi;
log eqA__, eqB__;
scantokens eqA__;
scantokens eqB__;
previousObject__ := str obj;
fi;
endfor;
fi;
enddef;
vardef leftToRight@#(text distanceBetweenObjects)(text objects)=
if str @# = "":
log "String is empty, alligning to midy";
allign(midy, left, right)(distanceBetweenObjects)("+")(objects);
else:
allign(@#, left, right)(distanceBetweenObjects)("+")(objects);
fi;
enddef;
vardef rightToLeft@#(text distanceBetweenObjects)(text objects)=
if str @# = "":
log "String is empty, alligning to midy";
allign(midy, right, left)(distanceBetweenObjects)("-")(objects);
else:
allign(@#, right, left)(distanceBetweenObjects)("-")(objects);
fi;
enddef;
vardef topToBottom@#(text distanceBetweenObjects)(text objects)=
if str @# = "":
log "String is empty, alligning to midx";
allign(midx, top, bottom)(distanceBetweenObjects)("-")(objects);
else:
allign(@#, top, bottom)(distanceBetweenObjects)("-")(objects);
fi;
enddef;
vardef bottomToTop@#(text distanceBetweenObjects)(text objects)=
if str @# = "":
log "String is empty, alligning to midx";
allign(midx, bottom, top)(distanceBetweenObjects)("+")(objects);
else:
allign(@#, bottom, top)(distanceBetweenObjects)("+")(objects);
fi;
enddef;
%%
%% Defines an equation which sets the given prefix to be equal for all the given objects.
%% For example:
%%
%% same.top(a, b, c);
%%
%% is equivalent to
%% a.top = b.top = c.top;
%%
vardef same@#(text objects)=
log "begin macro: same@#(text objects)=";
string equation__, property__;
equation__ := "";
property__ := str @#;
objectIndex__ := 0;
forsuffixes obj = objects:
log "object: " & str obj;
if objectIndex__ = 0:
objectIndex__ := objectIndex__ + 1;
equation__ := equation__ & str obj & "." & property__;
else:
objectIndex__ := objectIndex__ + 1;
equation__ := equation__ & "=" & str obj & "." & property__;
fi;
endfor;
equation__ := equation__ & ";";
log "Equation is: '" & equation__ & "'";
if objectIndex__ <= 1:
log "One or no objects, nothing to do!";
else:
scantokens equation__;
fi;
enddef;
%% this macro is NOT usable (yet)
vardef leftToRightCentered@#(expr distanceBetweenObjects, middlePoint)(text objects)=
string objectsAsString__;
objectsAsString__ := enumToString(objects)("");
if (objectsAsString__ = ""):
log "Nothing to do, bailing out.";
else:
log "ASDFGHJ";
leftToRight@#(distanceBetweenObjects)(objects);
string firstObject__, lastObject__;
objectIndex__ := 0;
forsuffixes obj = objects:
if objectIndex__ = 0:
objectIndex__ := objectIndex__ + 1;
firstObject__ := str obj;
else:
objectIndex__ := objectIndex__ + 1;
lastObject__ := str obj;
fi;
endfor;
log "___";
.5[authA.nw,authB.ne] = middlePoint;
log "___";
string eqCenter__;
eqCenter__ := ".5[" & firstObject__ & ".nw," & lastObject__ & ".ne] = middlePoint";
log eqCenter__;
log middlePoint;
log "XXX";
scantokens eqCenter__;
log "XXX";
fi;
enddef;
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