Abstract: Tools and techniques for creating and editing a master block definition for a block, and manipulating a block instantiation of the block are described. User input can be received defining a block and a master block definition can be generated for the block. The block can include one or more graphical entities and receiving a user input defining a block can include receiving one or more user inputs manipulating a graphical representation of the block. The master block definition can include at least one allowable manipulation to a geometry of the block when instantiated. One or more block instantiations of the block can be manipulated differently according to the allowable manipulation.

Abstract: Annotations in CAD drawings are given fixed sizes so that CAD application will generate the annotations at the fixed size even though modeled objects within the CAD drawing are scaled in accordance with a paper space scale selected by the CAD designer. The annotations generally comprise text annotations and graphic annotations, including one or more of text, dimensions, hatch patterns, and symbols, and are represented as annotation objects having multiple properties, such as size, visibility, position and rotation.

Abstract: Embodiments of the invention provide techniques for overriding layer display properties in computer-aided design (CAD) viewports. A method of generating a display representation of a CAD drawing includes identifying one or more layers of the CAD drawing to include in the display representation. Each of the one or more layers may be associated with a set of drawing elements and a set of layer display properties. The method also includes identifying a viewport display property for a first layer of the one or more layers and generating the display representation. The display representation may include the drawing elements associated with the one or more layers, and the appearance of the drawing elements associated with the first layer is based on the viewport display property.