% This is
% pkfootbows.mf
%
% Copyright (C) 1989-92 by Elmar Bartel.
%
% 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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
%
def DefineFootBows(
% This macro depends on the values of qs and BottomSpace
% and uses the makro ParallelPath.
expr BottomDist, %This is the space to BottomSpace
BowOneWidth, %This is the width of the main bow
FootHeight, %Distance from bottom of Bow0 to top of Bow3
BowTwoLoc, %Relative location of Bow2 between Bow3 and
% Bow1. 0 means position at position at Bow1,
% 1.0 means position at Bow3.
WidthToHeight, %Ratio of BowOneWidth/2 to Bowheight
BowTwoLen, %Length of Bow2 relative to Bow1
BowThreeLen %Lenght of Bow3 relative to Bow1
) =
% All parameters are in pixels when not otherwise statet.
% Points are numbered from 0 to 3 from lower to upper
% Points to the left have suffix l, right suffix r
% points without further suffix are in the center of the bows
path Bow[];
numeric BowHeight;
numeric l[],x[]l,x[]r,x[],y[]l,y[]r,y[];
BowHeight = BowOneWidth*WidthToHeight/2;
% We start with the first bow
x1r + x1l = qs; x1r - x1l = BowOneWidth;
y1 = BottomSpace + 2*BowHeight + BottomDist;
x1 = .5qs;
y1l = y1r = y1 - BowHeight;
Bow1 = z1l .. {right} z1 .. z1r;
z0 = z1 shifted (down*2*BowHeight);
Bow0 = z1r .. {left} z0 .. z1l;
Bow3= ParallelPath(Bow1,FootHeight-2*BowHeight);
l3 = length(Bow3);
cu:= (1-BowThreeLen)/2;
Bow3:= subpath (cu*l3,(1-cu)*l3) of Bow3;
z3l = point 0 of Bow3;
z3 = point .5*length(Bow3) of Bow3;
z3r = point infinity of Bow3;
if proofing >0:
show point 0 of reverse Bow3;
show z3r;
fi;
Bow2= ParallelPath(Bow1,(FootHeight-2*BowHeight)*BowTwoLoc);
l2 = length(Bow2);
cu:= (1-BowTwoLen)/2;
Bow2:= subpath (cu*l2,(1-cu)*l2) of Bow2;
z2l = point 0 of Bow2;
z2 = point .5length(Bow3) of Bow2;
z2r = point infinity of Bow2;
labels(1l,1,1r,2l,2r,3l,3r);
enddef;
%DefineFootBows( .55qs, % BowOneWidth
% .25qs, % FootHeight
% .40, % BowTwoLoc
% .13, % WidthToHeight
% .90, % BowTwoLen
% .95); % BowThreeLen