Turtle Graphics: Button & Slider Control

① This example demonstrates how to control a turtle's movement and drawing on a canvas using buttons and sliders, dynamically generating geometric shapes. ② Core mathematical concepts include angles, distances, directions, and construction of basic polygons and right triangles, along with numerical input and variable control. ③ Construction highlights: The GeoGebra Turtle command creates the turtle object; Textfield allows numeric input; Clear resets the canvas; α serves as an angle variable; Distance sets forward step length; Forward/Back move the turtle; Left/Right change orientation; Up/Down lift or lower the pen; Repeat, RepeatFL, and RepeatFR enable loop-based drawing; Zin/Zout zoom the view; tut may assist tutorials. ④ Suitable for upper elementary to middle school students learning geometry and basic programming logic, and for classroom demonstrations of dynamic geometric constructions to foster spatial reasoning and algorithmic thinking.