Text height determines the size in drawing units of the letters in the font you are using. The value usually represents the size of the uppercase letters, with the exception of TrueType fonts.
文字高度确定使用字体的字母大小，以图形单位计。该值通常表示大写字母的大小，但 TrueType 字体除外。
For TrueType fonts, the value specified for text height might not represent the height of uppercase letters. The height specified represents the height of a capital letter plus an accent area reserved for accent marks and other marks used in non-English languages. The relative portion of areas assigned to capital letters and accent characters is determined by the font designer at the time the font is designed, and, consequently, will vary from font to font.
对于 TrueType 字体，文字高度的值可能不代表大写字母的高度，而是代表大写字母的高度加上预留给重音标记和非英语语言中其他标记的重音区域的高度。指定给大写字母和重音字符区域的相对区域是由字体设计者在设计字体时确定的，因此会随着字体而变动。
In addition to the height of a capital letter and the ascent area that make up the height specified by the user, TrueType fonts have a descent area for portions of characters that extend below the text insertion line. Examples of such characters are y, j, p, g, and q.
除了大写字母和组成用户指定高度的重音字符之外，TrueType 字型还有用于部分字符的下降区域，扩展到文字的插入线之下。这些字符的例子有 y、j、p、g 和 q。
You specify the text height using the TextSize property of the text style or the Height property of a text object. This property accepts positive numbers only.
使用文字样式的 TextSize 属性或 文字对象的 Height 属性指定文字高度。此属性只接受正数。
