A graphic tutorial on the motion animation of geometric sketchpad action points on the three sides of a triangle

The geometric sketchpad can produce very intuitive dynamic geometric figures. However, when making dynamic animations, we usually encounter a problem: when a certain point moves, the trajectory is not on the boundary of the sketchpad. How to limit the range of movement of the point? This tutorial will explain in detail how to use the advanced function "script" in the geometric sketchpad to solve this problem. Through scripts, you can control the range of movement of points and create complex and beautiful dynamic geometric animations. Next, please follow the tutorial step by step to learn the skills of dynamic animation production on the geometric sketchpad.

Open the geometric sketchpad, click the [Polygon] tool in the left toolbox, select the tool with polygon interior, and draw a triangle in the blank area of ​​the sketchpad. The triangle drawn in this way has an interior, as shown in the figure shown.

Click the [Move Arrow] tool in the toolbox on the left, and then select the inside of the drawn triangle. After performing this operation, the entire inside of the triangle will be selected.

Click the [Construction] menu above, and select the top [Point on Boundary] command from the pop-up drop-down menu. As shown below.

After executing the above steps, a moving point will appear on any side of the triangle. Select the point and execute [Edit] - Operation button - Animation. Click [OK] in the pop-up dialog box, and an animation point button will appear on the drawing board.

Click the [Animation Point] operation button, and the moving point will move on the three sides of the triangle. You can also set the movement direction and speed of the point. Select the button, right-click and select [ Properties].

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