电脑如何写字母? [英] How does the computer draw a letter?

问题描述

我对创建一个能够识别图像中的数字，字母，符号的程序感兴趣.但是首先，我继续思考:您的系统如何显示字母?

I'm interested in creating a program capable of recognition of numbers, letters, symbols from an image. But first off, I went ahead and started to think about: How your system displays a letter?

有太多的字体，字体大小和其他特征.我想有一个方程用于生成具有给定参数的字母，是真的吗?还是系统还有其他方式生成字母?

There are so many fonts, font-sizes and other characteristics. I suppose there is an equation used to generate a letter with given parameters, is that true? Or are there other ways in which your system generates letters?

我发现这样一个基本的东西非常有趣，而且我在网络上找不到任何信息. 有什么想法吗?

I found such a basic thing so interesting, and I can’t find any information on the web. Any ideas?

推荐答案

每个字符都被通用分配一个代码.

Each character is universally assigned a code.

字体实际上是从代码(字符)到字形(有关如何绘制字符的说明)的映射.

A font really is a mapping from a code (character) to glyph (instructions on how to draw the character).

字形是路径的集合.

路径是一个字符串，实际上是关于在何处/如何绘制各种点，线和曲线的编码说明.字形具有多个路径，因为某些字符具有孔(例如R)和/或不相交的部分(例如j). (因此，这不是描述如何绘制字符的方程式.)

A path is a string that really is coded instructions on where/how to draw the various points, lines, and curves. A glyph has more than one path because some characters have holes (like R) and/or disjoint parts (like j). (So it's not an equation that describes how to draw characters.)

操作系统和/或某些程序知道如何解释字形数据并将其转换为屏幕上的像素.

The OS and/or some programs know how to interpret the glyph data and translate that to pixels on the screen.

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