几何变换动画:旋转、平移与位似构造的复合图形
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该范例通过GeoGebra展示了一个动态的几何变换动画,演示了圆、线段、多边形等基本图形在旋转、平移、位似(缩放)等变换下的复合效果。核心数学概念包括全等变换(旋转、平移)与相似变换(位似),以及变换的合成。作图要点:利用GeoGebra命令如Segment(线段)、Point(点)、Dilate(位似)、Vector(向量)、Line(直线)、Translate(平移)、Angle(角)、Rotate(旋转)、Circle(圆)、Intersect(交点)、CircleSector(圆扇形)等,构造了多个关联对象(如A、B、C、D、E、F、G、H、I等),并通过滑块或动画控制参数,使图形连续变化。适合中学几何教学,用于直观理解变换性质、图形运动规律及动态几何探究。
GeoGebra 命令及参数
Segment(A, B) → aPoint(Circle[C, a]) → DSegment(C, D) → bDilate(A, If[0 < c ≤ 1, 1 - c, 0], D) → A'Vector(A, A') → uLine(A, D) → dVector(A, D) → vTranslate(A, v) → A'_2Translate(B, v) → B'_1Segment(A'_2, B'_1) → a'_1Angle(C, D, B'_1) → αTranslate(A, u) → A'_1Translate(B, u) → B'Segment(A'_1, B') → a'Rotate(A'_1, If[1 < c ≤ 2, ((-(c - 1)) * α), (-α)], A'_1) → ERotate(B', If[1 < c ≤ 2, ((-(c - 1)) * α), (-α)], A'_1) → B''Segment(E, B'') → a''Circle(D, 1) → eIntersect(e, a'_1, 1) → FIntersect(e, b, 1) → GIntersect(e, a'_1, 1) → HIntersect(e, a'', 1) → ICircleSector(D, I, H) → f