Autodesk 057B1-41A111-1001 - AutoCAD LT 2010, Руководство пользователя

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If you place text manually, you can place the dimension text anywhere along
the dimension line, inside or outside the extension lines, as you create the
dimension. This option provides flexibility and is especially useful when space
is limited. However, the horizontal alignment options provide better accuracy
and consistency between dimensions.
Position Dimension Text Vertically
The position of the text relative to the dimension line is referred to as vertical
text placement. Text can be placed above or below or centered within the
dimension line. In the ANSI standards, centered text usually splits the
dimension line. In the ISO standards, it is usually above or outside the
dimension line. For example, ISO standards permit angular dimension text
to appear in any of the ways shown.
Other settings, such as Text Alignment, affect the vertical alignment of text.
For example, if Horizontal Alignment is selected, text inside the extension
lines and centered within the dimension line is horizontal, as shown in the
leftmost illustration above. The text is horizontal even if the dimension line
is not itself horizontal.
Dimensions and Tolerances | 389