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
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
% kindofcube.mp
% L. Nobre G.
% 2004
input featpost3Dplus2D;
verbatimtex \documentclass{article}\begin{document}{\sffamily etex
beginfig(1);
f := (4,1.2,0.5);
Spread := 120;
numeric lena, lenb, lenc, aa, ab, ac, angray, micr, labscal;
pair zeror;
color axa, axb, axc, returnedcorner, dummyc, auxx, auxy;
lena=0.3;
lenb=0.6;
lenc=0.9;
aa=130;
ab=32;
ac=67;
labscal=1.6;
angray=0.85;
micr=0.01;
zeror=rp(black);
cartaxes(1.2,1,1.15);
axa = ( cosd(aa), sind(aa), 0 );
axb = axa*cosd(ab)+blue*sind(ab);
auxx= ( cosd(aa+90), sind(aa+90), 0);
auxy = ncrossprod( axb, auxx );
axc = auxx*cosd(ac)+auxy*sind(ac);
draw zeror--rp(axa);
draw zeror--rp(axb);
draw zeror--rp(-0.6*axa);
draw zeror--rp(axc);
draw zeror--rp(auxx);
label.rt( btex $a$ etex scaled labscal, rp(axa) );
label.rt( btex $b$ etex scaled labscal, rp(axb) );
label.lft( btex $c$ etex scaled labscal, rp(auxx) );
label.lft( btex $d$ etex scaled labscal, rp(axc) );
angline( axa,red,black,angray,btex $\alpha_1$ etex scaled labscal,bot );
angline( axb,axa,black,angray,btex $\alpha_2$ etex scaled labscal,rt );
angline( axc,auxx,black,angray,btex $\alpha_3$ etex scaled labscal,lft );
squareangline( -axa,auxx,black,0.2);
drawoptions( withpen pencircle scaled 1.7pt withcolor 0.65blue );
kindofcube( false, true, black, aa, ab, ac, lena, lenb, lenc );
drawoptions();
dotlabel.bot( btex $\vec{o}$ etex scaled labscal, zeror );
label.bot( btex $l_1$ etex scaled labscal, rp(lena*axb) );
label.bot( btex $l_2$ etex scaled labscal, rp(0.5*lenb*axc) );
label.ulft( btex $l_3$ etex scaled labscal,rp(0.5*lenc*ncrossprod(axb,axc)));
endfig;
verbatimtex
\end{document}
etex
end.
|