墙纸p4对称图案

GeoGebra 命令及参数

1. Midpoint(A, B) → E
2. Midpoint(B, D) → F
3. Midpoint(D, C) → G
4. Midpoint(C, A) → H
5. Midpoint(C, B) → I
6. Vector(A, B) → u
7. Vector(A, C) → v
8. Vector(C, D) → w
9. Vector(B, D) → a
10. Segment(H, F) → b
11. Segment(E, G) → c
12. Segment(J, K) → e
13. Segment(K, L) → f
14. Segment(K, M) → g
15. Segment(K, N) → h
16. Rotate(cell1, 90*°, I) → cell2
17. Rotate(cell1, 180*°, I) → cell3
18. Rotate(cell1, 270*°, I) → cell4
19. Sequence(Translate[Sequence[Translate[tile, Vector[(n * u)]], n, -3, 3], Vector[(m * v)]], m, -3, 3) → tiling
20. Segment(H, I) → k
21. Segment(E, I) → l