图形变换演示

GeoGebra 命令及参数

1. Point(Circle[A, 2]) → B
2. Polygon(A, B, C) → poly1, c, a, b
3. Vector(E, F) → u
4. Translate(A, u) → A'
5. Translate(B, u) → B'
6. Translate(C, u) → C'
7. Polygon(A', B', C') → poly1', c', a', b'
8. Rotate(A, -(f°), D) → A'_1
9. Rotate(B, -(f°), D) → B'_1
10. Rotate(C, -(f°), D) → C'_1
11. Polygon(A'_1, B'_1, C'_1) → poly1'_1, c'_1, a'_1, b'_1
12. Dilate(A, g, D) → A'_2
13. Dilate(B, g, D) → B'_2
14. Dilate(C, g, D) → C'_2
15. Polygon(A'_2, B'_2, C'_2) → poly1'_2, c'_2, a'_2, b'_2
16. Intersect(b'_2, c'_2) → G
17. Intersect(b, c) → H
18. Intersect(b'_2, a'_2) → I
19. Intersect(b, a) → J
20. If(f ≟ 0, "", "Rotation " + (If[f < 0, -f, f]) + "∘ " + (If[f ≟ 180 ∨ f ≟ 360 ∨ f ≟ -180 ∨ f ≟ -360, "", If[f < 0, "anti-clockwise", "clockwise"]]) + " around (" + (x(D)) + "," + (y(D)) + ")") → text2
21. Line(K, L) → j
22. Mirror(A, j) → A'_3
23. Mirror(B, j) → B'_3
24. Mirror(C, j) → C'_3
25. Polygon(A'_3, B'_3, C'_3) → poly1'_3, c'_3, a'_3, b'_3
26. Slope(j) → m
27. If(g ≟ 1 ∨ g ≟ 0, "", "Enlarge, scale factor " + g + " from centre (" + (x(D)) + "," + (y(D)) + ")") → text3
28. Line(D, C'_2) → i
29. Line(D, B'_2) → l
30. Line(A'_2, D) → h