透视椭圆演示

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Line(A, B) → a
3. OrthogonalLine(B, a) → b
4. Intersect(b, xAxis) → C
5. Line(A, C) → c
6. OrthogonalLine(B, c) → d
7. Point(d) → D
8. Line(A, D) → e
9. Line(D, C) → f
10. Circle(C, B) → g
11. Circle(A, B) → h
12. Intersect(g, c, 1) → E
13. Intersect(h, c, 2) → F
14. Point(d) → G
15. OrthogonalLine(D, d) → i
16. Circle(D, G) → k
17. Intersect(k, i, 2) → H
18. Intersect(k, i, 1) → I
19. Line(I, E) → j
20. Line(H, F) → l
21. Intersect(e, l) → J
22. Intersect(f, j) → K
23. Line(J, d) → m
24. Line(K, d) → n
25. Line(A, G) → p
26. Line(G, C) → q
27. Intersect(m, p) → L
28. Intersect(n, q) → M
29. Line(M, A) → r
30. Line(L, C) → s
31. Intersect(r, s) → N
32. Line(K, A) → t
33. Line(J, C) → a_1
34. Intersect(t, a_1) → O
35. Line(D, L) → b_1
36. Line(J, G) → c_1
37. Intersect(b_1, c_1) → P
38. Line(K, N) → d_1
39. Line(O, M) → e_1
40. Intersect(d_1, e_1) → Q
41. Line(P, A) → f_1
42. Intersect(m, f_1) → R
43. Intersect(d, f_1) → S
44. Line(P, m) → g_1
45. Line(Q, d) → h_1
46. Intersect(t, h_1) → T
47. Intersect(e, g_1) → U
48. Intersect(p, g_1) → V
49. Intersect(r, h_1) → W
50. Line(O, N) → i_1
51. Line(Q, A) → j_1
52. Intersect(i_1, j_1) → Z
53. Intersect(n, j_1) → A_1
54. Segment(L, J) → k_1
55. Segment(J, D) → l_1
56. Segment(G, L) → m_1
57. Segment(N, L) → n_1
58. Segment(M, G) → p_1
59. Segment(K, M) → q_1
60. Segment(D, K) → r_1
61. Segment(G, D) → s_1
62. Segment(M, N) → t_1
63. Segment(O, N) → a_2
64. Segment(J, O) → b_2
65. Segment(K, O) → c_2
66. Segment(P, Q) → d_2
67. Midpoint(S, V) → B_1
68. Midpoint(R, U) → C_1
69. Line(G, B_1) → e_2
70. Line(J, C_1) → f_2
71. Intersect(e_2, f_2) → D_1
72. Point(l_1) → E_1
73. Line(P, E_1) → g_2
74. Line(U, S) → h_2
75. Intersect(g_2, h_2) → F_1
76. Line(V, F_1) → i_2
77. Line(R, E_1) → j_2
78. Intersect(i_2, j_2) → G_1
79. Conic(R, U, G_1, S, V) → k_2
80. Circle(J, D_1) → p_2
81. Line(G, D_1) → l_2
82. Line(J, D_1) → m_2
83. Intersect(p_2, m_2, 2) → H_1
84. Intersect(p_2, l_2, 2) → I_1
85. Line(V, S) → n_2
86. Line(R, U) → q_2
87. Line(D_1, n_2) → r_2
88. Line(D_1, q_2) → s_2
89. Intersect(p_2, r_2, 2) → J_1
90. Intersect(p_2, s_2, 2) → K_1
91. Line(H_1, K_1) → t_2
92. Line(J_1, I_1) → a_3
93. Intersect(t_2, a_3) → L_1
94. Line(L_1, J) → b_3
95. Intersect(p_2, b_3, 2) → M_1
96. Line(M_1, D_1) → c_3
97. OrthogonalLine(D_1, c_3) → d_3
98. Intersect(k_2, d_3, 1) → N_1
99. Intersect(k_2, c_3, 2) → O_1
100. Intersect(k_2, c_3, 1) → P_1
101. Intersect(k_2, d_3, 2) → Q_1
102. Segment(N_1, Q_1) → e_3
103. Segment(O_1, P_1) → f_3
104. Segment(D_1, C) → g_3
105. OrthogonalLine(P, d_2) → h_3