Set up mathematical expressions to use in label styles.
Label styles are composed of property fields that display information about an object. Expressions allow you to convert the object information using a formula, then insert the result into a label style component.
Expressions are stored in the Settings tree, within the label style type folders. They are not available for label style types that do not have relevant properties, such as Note label styles.
You insert expressions into label styles using the Text Component Editor when you are editing a label style text component.
You can use design data to determine how a label style is drawn using text, lines or block components. You can insert expressions into label styles by selecting expressions in place of static values for text, line, and block component modifiers. For example, in the Layout tab of the Label Style Composer dialog box, you can insert an expression in place of a static value when determining the text height of a label. This expression could increase the text height of a spot elevation label to coincide with the elevation height.
You can insert expressions in label styles to create custom graphics. For example, you can create a graphical profile band, in which the graphics of the vertical grades are relative to the actual grades in order to visually reinforce the data representation, or match graphical standards. A PVI can be represented by a symbol, where the lines/values representing the grade in and grade out change quadrants based on the sign of the grades.
