新冠病毒增长曲线

GeoGebra 命令及参数

1. Ray((0, 0), (0, 1)) → p_1
2. Point(p_1) → W
3. OrthogonalLine(W, yAxis) → h
4. OrthogonalLine(D', yAxis) → i
5. Intersect(f, i, (22.39821785166548, 1199.999999999991)) → F
6. Segment(D', F) → l
7. Segment(F, H) → n
8. Intersect(f, h, (17.332466814232944, 599.9999999999953)) → E
9. Segment(W, E) → j
10. Segment(E, G) → m
11. OrthogonalLine(I, yAxis) → p
12. OrthogonalLine(J, yAxis) → q
13. Intersect(f_{1}, p, 1) → K
14. Intersect(f_{1}, q, 1) → L
15. Segment(I, K) → r
16. Segment(J, L) → s
17. Segment(K, M) → t
18. Segment(L, N) → a
19. Polygon(W, D', F, H, G, E) → poly1, d, d', f_2, h_1, g_2, e
20. Polygon(I, J, L, N, M, K) → poly2, i_1, j_1, l_1, n_1, m_1, k_1
21. Intersect(g, i, (9.684983592469901, 1199.999999995298)) → D
22. Intersect(g, h, (7.08082391870675, 599.9999999976491)) → O
23. Polygon(W, D', D, S, R, O) → poly3, w, b, d_1, s_1, r_1, o
24. Intersect(g_{1}, p) → T
25. Intersect(g_{1}, q) → U
26. Polygon(I, J, U, Z, V, T) → poly4, i_2, j_2, u, z_1, v, t_1