/usr/share/texlive/texmf-dist/metapost/base/rboxes.mp is in texlive-metapost 2017.20180305-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | % $Id: rboxes.mp,v 1.2 2004/09/19 21:47:11 karl Exp $
% Public domain.
% This macro package is exactly like boxes.mp except that it defines
% an additional macro rboxit<box name>(<string or picture>) that produces
% rectangular boxes with rounded corners.
\input boxes
% Rectangular boxes with rounded corners
newinternal rbox_radius;
rbox_radius := 8bp;
vardef rboxit@#(text tt) =
beginbox_("rboxpath_","sizebox_",@#,tt);
generic_declare(pair) _n.sw, _n.s, _n.se, _n.e, _n.ne, _n.n, _n.nw, _n.w;
0 = xpart (@#nw-@#sw) = ypart(@#se-@#sw);
0 = xpart(@#ne-@#se) = ypart(@#ne-@#nw);
@#w = .5[@#nw,@#sw];
@#s = .5[@#sw,@#se];
@#e = .5[@#ne,@#se];
@#n = .5[@#ne,@#nw];
@#ne-@#c = @#c-@#sw = (@#dx,@#dy) + .5*(urcorner pic_@# - llcorner pic_@#);
endbox_(clearb_,@#);
enddef;
def rboxpath_(suffix $) =
save _r;
_r = min(rbox_radius, .5*ypart($.n-$.s), .5*xpart($.e-$.w));
$.sw+(_r,0) {right}..{right} $.se-(_r,0)
..$.se+(0,_r) {up}..{up} $.ne-(0,_r)
..$.ne-(_r,0) {left}..{left} $.nw+(_r,0)
..$.nw-(0,_r) {down}..{down} $.sw+(0,_r) .. cycle
enddef;
% sizebox_ and clearb_ are defined in boxes.mp
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