① material I have done, first select the middle white Diagonal, click the menu bar-animation-Custom animation, pop-up right side of the Custom animation pane, add effect----erase.
② Modify the Erase properties and start: When clicked, direction: From top, speed: very fast.
③ continues to add an exit-vanishing action to the white diagonal.
④ Select the upper part of the area, add effect--exit----sinking.
⑤ Modify the Sinking property to start: After, speed: fast.
⑥ then select the text, add the effect--go in--wave.
Set to complete, click the Slide button to play, the first is the yellow background, the upper part of the beginning to become white, the letters gradually fall, fall to the diagonal, forming a start.