1. First, with the complete circuit diagram as the background, draw a straight line or a free curve on the line that needs animation and superimpose it on the base map. Set the custom animation of the line, and the animation effect is selected as "Erase" of the "Enter" item.

2. First find the PPT presentation on the desktop and click Open. Then click the shape in the starting directory and select the line below it. Then draw a straight line in the ppt text, as shown. Then select this straight line and click the custom animation option in the animation.

3. Select Insert Graph in the Insert button, then select lines, click lines to adjust the direction of lines as needed, then click the Animation button in the menu bar, select Fly-in, and then select the direction of fly-in in in the animation effect to make different animations for multiple lines to achieve the effect of spelling words.

4. In PPT2007, several straight lines are inserted from "shape" to form a polygon, and then each line segment is selected for animation. The order of animation effects can be arranged in the animation pane.

5. First draw a line in the scene, insert a key frame in the tenth frame on the time axis (it can also be a key frame in other positions, but it must be on the same layer), and operate the line just drawn on this key frame.

6. Make line animation PPT, and set the animation to "appear" and "disappear". The steps are as follows: Open PPT software, click "straight line" as shown in the figure, and then hold down the left mouse button to draw a straight line on the slide. Then click the "Animation" menu above, and then click "Custom Animation".