mp/arrow24.mp at master · drauk/mp · GitHub

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% tex/conc/mp/arrow24.mp   2017-1-17   Alan U. Kennington.
% $Id: tex/conc/mp/arrow24.mp e6195bdce8 2017-01-17 13:47:55Z Alan U. Kennington $
% Norm on a linear space over a field.

input mapmax
input centmax
verbatimtex
\input akmath
etex

% - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
beginfig(1);
pair w[], midpt;
path pat[];

a := 2.0cm;
b := 2.0cm;
q := 0.5cm;
qq := 0.38cm;
cr := 5pt;
theta := 1;
d := 15pt;

w0 := (0,0);
w1 := (0,b);
w2 := (a,b);

% - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
% The labels for the spaces.
label(btex $V$ etex, w0);
label(btex $\llap{$\lambda\in{}$}K$ etex, w1);
label(btex $\reals$ etex, w2);

% The arrows.
pickup pencircle scaled 0.5bp;
S_arrowspaces(w0,w1,qq,qq,2,black);
S_arrowspaces(w0,w2,q,q,1,black);
S_arrowspaces(w1,w2,qq,q,1,black);

draw fullcircle scaled cr shifted 0.56[w0,w1];

% The arrow labels.
label.lft(btex $L_\lambda$ etex, 0.56[w0,w1]+(-4pt,0));
label.lrt(btex $\psi$ etex, 0.56[w0,w2]+(0,0));
label.top(btex $\vert\cdotsp\vert$ etex, 0.45[w1,w2]);

pat1 := subpath (theta, 8-theta) of fullcircle scaled d;

drawarrow pat1 rotated 90 shifted (w0+(0,-d));
label.lft(btex $L_\lambda$ etex, w0+(-0.5d,-d));

drawarrow pat1 rotated 180 shifted (w2+(d,0));
label.rt(btex $L_{\vert\lambda\vert}$ etex, w2+(1.5d,0));

% Save the current picture bounding box.
C_bbox_centre_get(currentpicture)(midpt);

label.rt(btex $\psi\circ L_\lambda=L_{\vert\lambda\vert}\circ\psi$ etex,
 0.5[w0,w2]+(20pt,-20pt));

% Centre the current picture bounding box.
C_bbox_centre_set(currentpicture)(midpt);

endfig;
end