Taishan Office Technology Lecture: the first difficulty is vertical positioning

　　 Previously summarized OFFICE Several difficulties . Recently, the layout has been revisited , Finding vertical positioning should be the first difficulty . The first difficulty is not the most difficult , But the first thing to be solved . This is not solved , The latter cannot be accurate .

　　 Why does vertical positioning become difficult ？ Actually , This is not a difficult point . because WORD It has been done. , And it has been widely used , It became the de facto standard . Now you must do something new OFFICE, Then it must be done like others , Others think you “ Well done ”, Otherwise it's wrong . There are two questions ：

• Others do not disclose the algorithm , Then you can only guess . Why do others do this , There was a reason . Now I don't know why , We can only rely on the reverse reexamination .
• The font engine is different . Same setup , The font engine is different , Will result in different heights , So it's different on a certain line . That's the trouble .

　　 Someone is going to ask , Why lateral positioning is not difficult ？ This is, of course, because the horizontal width calculation is relatively fixed .