Drawing:Basic CAD Tools
Blocks
Insert Block Into Drawing
A block is a collection of geometry that represents something logical. Blocks can represent doors, toilets, details or anything else. ----
 Note: When a block is placed in a drawing it is referred to as an Insert or the block is inserted in the drawing space.
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Create Attribute Definition
An Attribute is an editable text entity that when included in a Block can be edited later using the Edit Attributes function. This lets us have changeable text in each insert of a Block.
Make a Block
Create a block by naming, determining a basepoint or insertion point for the block and selecting the geometry to include.
Write Block to File
Select a block to write out to its own dwg file.
External Reference Manager (XREF)
External references are other dwg drawings that are displayed in this drawing but are not editable in this drawing. XRefs are display only.
Line
A single line segment with a start point and an end point.
Polyline
Multiple line segments created by using an ordered collection of vertexes. Polylines can also render curves by setting the bulge factor of any vertex in the list. A closed polyline is one whose starting vertex and ending vertex connect.
Circle
A circle entity defined by a Center and a Radius.
