① first of all, we open the PowerPoint2010, the relevant material I have been ready, single strokes, click the Custom button in the Animation tab, then the right side will appear the task pane of custom Animation.
② in the Custom pane on the right, click Add Effect--enter--fade out.
The ③ animation is added and the speed is set to very fast.
④ Click Add Effect again--motion path--down.
⑤ sets the action to start after the mouse clicks.
⑥ hold down the SHIFT key to adjust the length of the motion path, and then select the following circle to add an effect--accent--To change the line color.
⑦ is also set to start, the color itself designates, the speed for very fast.
⑧ Setup Complete, we play the slide, we can see the drop of water droplets, and contact with the circle, the circle color change to the effect of the drop color.