To find out how you access this object information, lets look at the C:EDTXT PROGRAM used in chapter 7.Īs you may recall, this program allows you to edit a line of text without having to enter the entire line. Each name in the selection set has a unique number assigned to it from zero to 1 minus the number of names in the set. Selection sets can contain just one object name or several. Using Selection Sets and Object NamesĪ selection set is a collection of object names. Once you knows an object name, you can access the information stored in the object's record. This database record holds all the information regarding the particular object. An object name is actually a device used to point to a record in a drawing database. Object names are similar to symbols in that they are a symbolic representation of an object. Object properties are accessed using two AutoLISP data types, object names and selection sets. You can also directly modify these properties. You can find properties such as the endpoint coordinates of lines, their layer, color and linetypes, and the string value of text. One of the most powerful features of AutoLISP is its ability to access the properties of drawing objects. The ABC’s of AutoLISP by George Omura Finding the Properties of AutoCAD Objects
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