-
Notifications
You must be signed in to change notification settings - Fork 1
/
3d2.mp
74 lines (60 loc) · 1.62 KB
/
3d2.mp
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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
% tex/conc/mp/3d2.mp 2005-3-10 Alan Kennington.
% $Id: tex/conc/mp/3d2.mp 8017ff16b3 2008-06-01 17:11:26Z Alan U. Kennington $
% 3d graphic: x,y,z graph demo.
input 3dmax.mp
%%%%%%%%%%%%%%%%%%%%%%%%%
% figure 1 %
%%%%%%%%%%%%%%%%%%%%%%%%%
beginfig(1);
numeric A[][]; % The current 4x3 transformation matrix.
numeric p[][], q[][]; % Lists of 3-vectors.
pair w[]; % Coordinate pairs on the drawing canvas.
numeric s; % The screen scale factor.
Z_set(p0)(20, -10, 10); % Position of viewer.
Z_set(q0)(0, 0, 0); % Centre of picture.
A_set_pq(A)(p0)(q0);
% A_print(A);
s := 300;
axlength := 6;
Z_set(p1)(axlength, 0, 0); % X axis.
Z_set(p2)(0, axlength, 0); % Y axis.
Z_set(p3)(0, 0, axlength); % Z axis.
Z_set(p4)(0, 0, 0); % Origin.
A_calc_w(A)(w1)(p1)(s);
A_calc_w(A)(w2)(p2)(s);
A_calc_w(A)(w3)(p3)(s);
A_calc_w(A)(w4)(p4)(s);
% showvariable w;
drawarrow w4--w1;
drawarrow w4--w2;
drawarrow w4--w3;
np := 5;
nq := 5;
xt := 0.5; % Extension of lines.
for i=-np step 1 until np:
Z_set(p5)(i, -nq - xt, 0);
Z_set(p6)(i, nq + xt, 0);
A_calc_w(A)(w5)(p5)(s);
A_calc_w(A)(w6)(p6)(s);
draw w5--w6;
endfor
for j=-nq step 1 until nq:
Z_set(p5)(-np - xt, j, 0);
Z_set(p6)(np + xt, j, 0);
A_calc_w(A)(w5)(p5)(s);
A_calc_w(A)(w6)(p6)(s);
draw w5--w6;
endfor
pickup pencircle;
for i=-np step 1 until np:
for j=-nq step 1 until nq:
Z_set(p5)(i, j, 0);
A_calc_w(A)(w5)(p5)(s);
draw w5;
endfor
endfor
label.lrt(btex $x$ etex, w1);
label.rt(btex $y$ etex, w2);
label.top(btex $z$ etex, w3);
endfig;
end