几何变换动画

GeoGebra 命令及参数

1. Midpoint(A, B) → C
2. Dilate(A, If[0 < a ≤ 1, 1 - a, 0], C) → A'
3. Dilate(C, If[1 < a ≤ 2, 2 - a, 0], B) → C'
4. Segment(A, A') → j
5. Segment(C, C') → k
6. Rotate(A, If[2 < a ≤ 3, ((a - 2) * π), π], C) → A'_1
7. Rotate(A', If[2 < a ≤ 3, ((a - 2) * π), π], C) → A''
8. Segment(A'_1, A'') → j'
9. Intersect(i, l) → D
10. Intersect(f, i) → E
11. Dilate(E, If[6 < a ≤ 7, 7 - a, 0], D) → E'
12. Segment(E, E') → m
13. Dilate(D, If[7 < a ≤ 8, 8 - a, 0], B) → D'
14. Segment(D, D') → n
15. Rotate(E, If[8 < a ≤ 9, ((a - 8) * π), π], D) → E'_1
16. Rotate(E', If[8 < a ≤ 9, ((a - 8) * π), π], D) → E''
17. Segment(E'_1, E'') → m'
18. Dilate(B, If[10 < a ≤ 11, 11 - a, 0], D) → B'
19. Dilate(E, If[10 < a ≤ 11, 11 - a, 0], D) → E'_2
20. Vector(E, E'_2) → u
21. Vector(B, B') → v
22. Intersect(f, p) → F
23. Intersect(g, p) → G
24. Dilate(E, If[12 < a ≤ 13, 13 - a, 0], F) → E'_3
25. Dilate(B, If[12 < a ≤ 13, 13 - a, 0], G) → B'_1
26. Vector(E, E'_3) → w
27. Vector(B, B'_1) → b
28. Translate(D, w) → D'_1
29. Vector(E'_3, D'_1) → c
30. Vector(B'_1, D'_1) → d
31. Dilate(A, If[6 < a ≤ 7, 7 - a, 0], F) → A'_2
32. Segment(A, A'_2) → q
33. Dilate(F, If[7 < a ≤ 8, 8 - a, 0], E) → F'
34. Segment(F, F') → r
35. Rotate(A, If[8 < a ≤ 9, ((a - 8) * π), π], F) → A'_3
36. Rotate(A'_2, If[8 < a ≤ 9, ((a - 8) * π), π], F) → H
37. Segment(A'_3, H) → q'
38. Dilate(A, If[10 < a ≤ 11, 11 - a, 0], F) → A'_4
39. Dilate(E, If[10 < a ≤ 11, 11 - a, 0], F) → E'_4
40. Vector(A, A'_4) → s
41. Vector(E, E'_4) → t
42. Dilate(F, If[12 < a ≤ 13, 13 - a, 0], MIDPOINT) → I
43. Vector(F, I) → u_1
44. Translate(A, u_1) → A'_5
45. Vector(A'_5, I) → v_1
46. Translate(E, u_1) → E'_5
47. Vector(E'_5, I) → w_1
48. Translate(F, u_1) → F'_1