正方体的截面 by nandrews

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → poly1, a, b, c, d
2. Prism(poly1, 4) → e, E, edgeAE, edgeBF, edgeCG, edgeDH, edgeEF, edgeFG, edgeGH, edgeEH, F, G, H, faceABFE, faceBCGF, faceCDHG, faceADHE, faceEFGH
3. Point(edgeFG) → I
4. OrthogonalLine(I, edgeEH, space) → f
5. OrthogonalLine(I, b, space) → g
6. Intersect(b, g) → J
7. OrthogonalLine(J, d, space) → h
8. Intersect(edgeEH, f) → K
9. Intersect(h, faceADHE) → L
10. Polygon(I, K, L, J) → poly2, i, k, l, j
11. Point(edgeCG) → M
12. OrthogonalLine(M, edgeBF, space) → n
13. OrthogonalLine(M, edgeDH, space) → p
14. Intersect(p, edgeDH) → N
15. OrthogonalLine(N, edgeAE, space) → q
16. Point(q) → O
17. Point(n) → P
18. Polygon(M, N, O, P) → poly3, m_1, n_1, o, p_1
19. Point(edgeEH) → Q
20. Intersect(edgeCG, edgeGH) → R
21. Point(edgeDH) → S
22. Plane(Q, R, S) → s
23. IntersectPath(s, e) → poly4, T, U, V, W, t, a_1, b_1, c_1
24. Intersect(edgeGH, edgeDH) → Z
25. Intersect(edgeDH, d) → C_1
26. Intersect(edgeGH, edgeEH) → A_1
27. Intersect(edgeFG, edgeBF) → B_1
28. Segment(A_1, B_1) → d_1
29. Intersect(edgeBF, a) → D_1
30. Segment(C_1, D_1) → e_1
31. Point(d_1) → E_1
32. Intersect(edgeCG, edgeFG) → F_1
33. Intersect(edgeEH, edgeAE) → G_1
34. Segment(G_1, C_1) → f_1
35. Segment(F_1, C_1) → g_1
36. Midpoint(g_1) → I_1
37. Midpoint(f_1) → J_1
38. Plane(E_1, J_1, I_1) → v
39. IntersectPath(v, e) → poly5, K_1, l_1, L_1, M_1, N_1, O_1, h_1, i_1, j_1, k_1