Steps to create a small circle rolling animation around a large circle using geometric sketchpad

Summary: How to make the small circle roll along the big circle? This problem is often encountered in geometric sketchpad animation production. In order to help everyone solve this problem, PHP editor Zimo specially compiled the steps for making a small circle rolling animation around a large circle. Through the detailed explanation in this article, everyone can easily master this animation technique and create stunning dynamic effects.

Construct an arc. To create an animation of points moving on an arc, you must first construct an arc. The arc is obtained based on the circle, so you still need to draw the circle in the geometry sketchpad first.

Select the [Circle Tool] button on the left sidebar, click the mouse in the working area on the right, drag the mouse after determining the center of the circle, and click again after determining the size of the circle. Click the mouse cursor to draw the circle.

To construct an arc from a circle, first pick two free points on the circle, select the [Point Tool] button on the left sidebar, pick two points A and B on the circle, and use the move tool Select the center point, point A, and point B of the middle circle in sequence, click the upper menu [Construction] and select the [Arc on Circle] command from the menu bar above. This will give you the arc AB,

Construct free point C on arc AB. Select [Move Tool] on the left sidebar, click the [Construction] menu on the upper menu bar, and select the [Point on Arc] command from its drop-down option, so that you can get the free point C,

Create point animation. Use the move tool to select point C, click the [Edit] menu in the upper menu bar, select the [Operation Button]-[Animation] command in its drop-down option, and click OK in the pop-up dialog box to get the animated point button. Click With this button, point C can freely move back and forth on arc AB. Hide unnecessary objects and the final effect is as shown in the figure.

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