A computer font.

Chinese fonts (generally mixed Chinese and western), foreign fonts (pure western), graphic symbol library;

Foreign fonts in ................. can be divided into English fonts, Russian fonts, Japanese fonts, etc. Simplified font, traditional font, GBK font, etc. By coding

GB23 12, GBK, GB 18030 and so on; Shuti (Shutong), Yaoti (Yaozhutian), Qiti (Qigong), Kangti (Kang Youwei),

................. Lanting (Wang Xizhi), Li Xiang (Wang Xiangzhi), Jing Lei (Xu Jinglei), Ye Genyou (handwritten) and so on. The full code name of GB23 12 or GB23 12-80 is the Chinese national standard Simplified Chinese Character Set, which is called the Basic Set of Chinese Character Coded Character Set for Information Interchange. It was issued by the State Administration of Standards and implemented on May 198 1. GB23 12 code is popular in Chinese mainland; Singapore and other places also adopt this coding. Almost all Chinese systems and international software support GB23 12.

GB23 12 standard * * * contains 6763 Chinese characters. GB23 12 "partitions" the received Chinese characters, and each partition contains 94 Chinese characters/symbols. This representation is also called the location code. 0 1-09 is a special symbol. 16-55 is a first-class Chinese character * * * 3755 Chinese characters, sorted by pinyin; Area 56-87 contains 3,008 Chinese characters, sorted by radicals/strokes. 10- 15 and 88-94 are uncoded. The full name of GBK is Chinese internal code extension specification, and the English name is Chinese internal code specification. K is the initial consonant of wide war, which corresponds to wide war. Unicode 1. 1 was released in 1993, which contains 209 12 characters of Chinese characters commonly used in Chinese mainland, Taiwan Province, Japan and South Korea. Chinese mainland has formulated the version of "GB 13000. 1-93", which is equivalent to Unicode 1. 1. Information technology universal multi-octet coded character set (UCS) Part I: architecture and basic multilingual plane.

Because GB23 12-80 only contains 6,763 Chinese characters, there are many Chinese characters, such as some simplified characters (such as "Luo"), some names (such as "Rong" of former Prime Minister of China), traditional Chinese characters used in Hong Kong and Taiwan, Japanese and Korean Chinese characters, etc. Chinese mainland collected all the Chinese characters in Unicode 1. 1 and GB 13000. 1-93 by using the unused coding space, and formulated the GBK coding. In Windows 98, Microsoft adopted GBK coding. It is called CP936 word code table in Microsoft system.

According to western data, GBK was originally an extension of GB23 12 by Microsoft, namely CP936, which first appeared in the simplified Chinese version of Windows 95. Due to the popularity of Windows products in Chinese mainland, the relevant state departments regard it as a technical specification. Note that GBK is not a formal national standard, but a "technical specification guidance document" issued by the Standardization Department of the State Bureau of Technical Supervision and the Science and Technology Quality Supervision Department of the Ministry of Electronic Industry. Although GBK contains all Chinese characters in Unicode 1. 1 and GB 13000. 1-93, the encoding method is different from that in Unicode 1. 1-93. It is only a transition scheme from GB23 12 to GB 13000. 1-93.

In 2000, China National Bureau of Standards introduced GB 18030-2000 to replace GBK standard. GB 18030-2000 not only retains all GBK coded Chinese characters, but also increases the coding space of about 100 Chinese characters and 4 bytes. Please refer to GB 18030-2000 True Type (TT), which is a new digital font description technology jointly proposed by Apple and Microsoft. TT is a rich set of instructions, which describe the outline of fonts with color digital functions. These instructions include font construction, color filling, digital description function, process condition control, grid processor (TT processor) control, additional prompt information control and so on.

TT uses quadratic B-spline curves and straight lines in geometry to describe the outline of fonts. Quadratic B-spline curves have first-order continuity and tangent continuity. Parabola can be accurately represented by quadratic B-spline curves, and more complex font shapes can be represented by several connected quadratic B-spline curves and straight lines according to the mathematical characteristics of B-sample length curves. Files describing TT fonts (including TT font description information, instruction set, various tag tables, etc.). ) may be commonly used on MAC and PC platforms. It is stored as a "Sfnt" resource on the Mac platform and appears as a TTF file on the Windows platform. In order to ensure the cross-platform compatibility of TT, the data format of font file adopts Motorola-style data structure (high bit first, low bit last). All TT interpreters on Intel platforms only need to be properly preprocessed before execution. The TT interpreter of Windows has been included in its GDI (graphics device interface), so any output device supported by Windows has already included TT interpreter in its GDI (graphics device interface), so any output device supported by Windows can output in TT font.

TT technology has the following advantages:

What you see is what you get. TT supports almost all output devices, so for the target output devices, whether it is the screen of the system, laser printer or laser imagesetter, all fonts with TT installed in the operating system can be output on the output devices with specified resolution, so most typesetting applications can accurately typeset pages according to the resolution and other parameters of the current target output devices.

② Support font embedding technology to ensure file cross-system transmission. TT technology embedding technology solves the problem of consistency between files and fonts across systems. In the application, all TT fonts used in the file can be embedded in the saved file. So that the whole file and its fonts can be easily transferred to other computers and used in the same system. Font embedding technology ensures that even if the computer receiving the file does not install the font used for transmitting the file, the original format of the file can be maintained by loading TT font embedded in the file, and the original font can be used for printing and modification.

③ Compatibility of operating system platforms. Both MAC and Windows platforms provide system-level TT support. Therefore, application files with the same name between different operating system platforms have cross-platform compatibility. If PageMaker on mac can use all TT fonts used in the file when installed, the final output effect of the file on Mac will be highly consistent with that under Windows.

④ABC word width value. Each character in TT font has its own word width value. Compared with the traditional TT interpreter of PS, the word width description method used by TT is included in its GDI (graphics device interface), so any output device supported by Windows can output in TT font.

In Windows 98 *. TTF(True Type) outline font file is the most commonly used file in the system. Can display and print, support infinite zoom, and there will be no sawtooth problem under any circumstances. *。 FOT is a font resource file corresponding to *. TTF file, which is the resource pointer of TTF font file, indicates the specific location of TTF file used by the system without specifying it in FONTS folder. *.FNT (vector font) and *. FON (display font) is widely used. In addition, users who have used the old version of WPS may still have a certain impression of *. PS file. *.PS is actually a form of outline fonts in DOS, and its performance is basically similar to that of *.TTF. We can even use these * after adopting some special methods. Direct PS fonts in Windows (*.PS 1 and *.PS2 are both PS fonts). PostScript, also known as PostScript Language (PS), is a page description language developed by Adobe Company on the basis of a previous three-dimensional graphics-oriented language. It is an interface language for desktop system to output to imagesetter, and it is specially designed for describing images and characters. The function is to record the images and characters on the page with digital formula and run them on the computer, and translate them into the required output through the PostScript decoder, such as displaying or printing on the screen, and then translate them into the required output through the PostScript decoder, such as displaying on the screen or outputting them on the printer or laser imagesetter.

PostScript language is the most popular page description language in the world. It has a large number of graphic operators and can be used in any combination. It can describe and process words, geometric figures and externally input figures, and can describe any complex page in theory. The successful application of this page description language in its design has become the choice of many manufacturers.

Its rich graphic function and efficient description of complex pages attract the support of typesetting software and graphic software of many publishing systems. Almost all prepress output devices support PS language, and the success of PS language makes open electronic publishing system widely popular all over the world. In the late 1980s, it also became a de facto industry standard. After years of experience and feedback from many PS products, 1990 introduced PS2, and 1990 further introduced PS3.