一点透视中的立方体

GeoGebra 命令及参数

1. Point(f) → VP
2. Point(g) → A
3. Point(g) → B
4. OrthogonalLine(A, g) → h
5. OrthogonalLine(B, g) → i
6. Point(i) → C
7. OrthogonalLine(C, i) → j
8. Intersect(h, j) → D
9. Polygon(A, B, C, D) → q1, a_1, b_1, c, d
10. Ray(VP, A) → k
11. Ray(VP, B) → l
12. Ray(VP, D) → m
13. Ray(VP, C) → n
14. Point(l) → E
15. Line(E, a_1) → p
16. Intersect(p, k) → F
17. Segment(E, F) → q
18. OrthogonalLine(F, p) → r
19. Intersect(r, m) → G
20. Segment(F, G) → s
21. Segment(E, B) → t
22. Segment(F, A) → f_1
23. Segment(G, D) → g_1
24. Line(E, s) → h_1
25. Intersect(h_1, n) → H
26. Segment(E, H) → i_1
27. Segment(H, G) → j_1
28. Segment(H, C) → k_1
29. Polygon(F, E, B, A) → q2, f_2, e_1, b_2, a_2
30. Polygon(E, H, G, F) → q3, e_2, h_2, g_2, f_3
31. Polygon(G, H, C, D) → q4, g_3, h_3, c_1, d_1
32. Polygon(E, B, C, H) → q5, e_3, b_3, c_2, h_4