Detailed method for creating moving point trajectory animation using geometric sketchpad

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For example, if you want to create a trajectory animation of the midpoint of a line segment with one endpoint fixed and the other endpoint moving on a fixed circle, the specific operation is as follows:

Step 1: Draw the fixed circle O and the line segment DC, D is the vertex, and C is the moving point. Select the [Circle Tool] on the left sidebar. Click and drag anywhere on the artboard until the circle is the right size. The center of the circle is O; Step 2: Select the [Line Segment Tool]. Draw line segment DC, D is the vertex, and C is the moving point. As shown in the figure;

Step 2 selects circle O and point C, click [Edit] - [Merge Points to Circle] in the upper menu bar, so as to ensure the movement of point C When, it is always on the circle.

Step 3 Construct the midpoint of the line segment. Select the segment CD, click [Construction] - [Midpoint] on the upper menu bar to get the midpoint of the line segment, and use the label tool to label the midpoint P.

Step 4 Create an action button. Select point C. Note that the circle cannot be selected. Click [Edit] on the upper menu bar - operation button - animation. In the pop-up dialog box, the movement speed and direction are default, and click [OK]. At this time, there is an additional button in the workspace. At this time, if you click the button, point C will move on the circle, but point P has not left a trace.

Step 5 Trace the midpoint. Use the [Move Tool] to select point P, and click [Display] - [Tracking Midpoint] in the upper menu bar, as shown in the figure below.

Step 6 Click the [Animation Point] button. Obviously, you can see that the trajectory of point P is a circle. During exercise, you can stop anywhere by pressing the button, and start moving again by pressing it again. This animation is perfect.

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