About AutoCAD's .TTF and .SHX font files:
When using AutoCAD to open a drawing sent by another designer, it often prompts that the corresponding font cannot be found and a dialog box pops up to replace the font. If this happens, if you do not know that the font is in the drawing For specific purposes, one method is to "cancel" without replacing it, and then open the drawing to see the specific words or symbols that cannot be displayed normally; one method is to select a similar font in the list according to the name, but there is no font name. This method will be more effective when you can see the general type. Due to lack of understanding of the font type, not only the font cannot be displayed normally when replacing, but sometimes a prompt similar to the following appears: "hztxt2.SHX is a large font file, not a shape file. Eref.SHX is a regular font file, not a shape file."
What is a large font file? What are regular font files? What is a shape file again? How are they different, and what does each do? In order to be able to handle text correctly, it is necessary to have an understanding of the classification of fonts.
The font files that can be used by CAD are mainly divided into two categories, one is the *.SHX font customized by CAD; Designers of both types of fonts can add them by themselves. TTF fonts can be added by installing fonts or copying *.TTF files to the fonts directory of Windows. TTF fonts are usually used alone, and can be selected in the font drop-down box of the text style. SHX fonts can be directly copied to the fonts directory under the CAD installation directory.
SHX fonts are divided into two types: one is glyphs, which are used to write text or symbols, such as txt.SHX, gbcbig.SHX, etc.; glyphs are divided into two types: large fonts and small fonts, and large fonts are defined Double-byte Asian characters are called large font files, such as Chinese (gbcbig.SHX), Korean, etc.; small fonts are generally Western characters, called regular font files, such as txt.SHX, etc., one is symbolic , used to insert special symbols, graphics or graphics in defined line types, such as ltypeshp.SHX, aaa.SHX, gdt.SHX, etc. Symbolic shape, as the name implies, refers to a specific symbol. There are three general usages of it:
2. Embed line type: Embed the symbol shape into the line type code, and then the entity specifies the line type, and then it can be used (common such as ltypeshp.SHX)
3. Special symbols: such as tolerance symbols, this is for internal use, generally GDT.SHX
Although they are all SHX files, different types of fonts have different purposes, so they cannot be replaced at will. Font files of the same type cannot be replaced at will, even font files with the same name sometimes have different internal definitions. For example, there are many versions of hztxt.SHX, which is widely used in the Design Institute, some with steel bar symbols, and some without. Therefore, the same version of hztxt.SHX must be used to ensure that all characters can be displayed normally. Most design units now have requirements for the fonts used in drawings, so as to ensure that there are no font problems during internal design communication or cooperation. When it is necessary to communicate drawings with other units, it is recommended to attach the font files used to avoid unnecessary troubles to the other party.
Actually, the SHX font and big font (also called bigfont) in CAD are all autoCAD's own proprietary fonts. Large fonts are also SHX fonts, a special form of SHX fonts. To talk about SHX fonts, we have to talk about the development process of fonts in CAD. autoCAD also has its own font library in the fonts directory. Font files with the extension SHX are called SHX fonts. The original SHX font supports ANSI characters, and later expanded to support non-ANSI characters, that is, large fonts or bigfont, which are stored in double bytes, which is why it is called a large font. But only as a word processing patch, to be specified separately. It should be said that the large fonts at this time do not necessarily conform to the Unicode standard, so sometimes garbled characters appear. The SHX font is the early product of CAD. Starting from r14, autoCAD began to support Windows fonts, which is probably the trend of CAD development. However, since SHX fonts (including large fonts) are specially made for CAD, as far as the current situation is concerned, there are still many advantages, as shown in:
1. It occupies less space in the storage of dwg files, and the display speed is faster. Especially in the case of a lot of text, the difference in the re-display speed of regen is more obvious, and there is no time difference in the update of real-time movement (pan).
2. Since Windows fonts are foreign fonts (compared to SHX fonts), they cannot be perfect during the process of generating and editing. For example, in the process of moving and copying text in TrueType fonts (Windows fonts), the length of sentences may be different from the actual length, which affects the reference positioning. For another example, the actual height of a TrueType font may be different from the specified height, and the character height cannot be specified precisely, but can only be determined by trial and error, which affects the speed of drawing and the difficulty of programming control.
3. Since the SHX font is a linear font, special attributes can be specified like line segments to produce special effects. For example, you can specify a thickness value to produce a three-dimensional effect.
4. Compared with TrueType fonts, the aesthetic effect of SHX fonts is not ideal, but it can still meet the needs in engineering. The SHX font is equivalent to hard pen calligraphy, and there is a gap in simulating brush calligraphy.
Since SHX fonts and Windows TrueType fonts have their own strengths, they can learn from each other in the project and use them as appropriate.
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