You usually create drawings by combining and modifying several different basic primitive shapes, such as lines, circles, and arcs, to create more complex shapes. This tutorial will help you learn how to draw some shapes. Keep in mind that one of the advantages of using CAD over drawing on paper is that you are creating an accurate model of the drawing geometry. In Tutorial 3, you will learn to list information from the drawing database. Information extracted from the drawing is accurate only if you created the drawing accurately in the first place.
You can organize drawing information on different layers. Think of a layer as a transparent drawing sheet that you place over the drawing and that you can remove at will. The coordinate system remains the same from one layer to another, so graphical objects on separate layers remain aligned. You can create a virtually unlimited number of layers within the same drawing. The Layer command allows control of the color and line type associated with a given layer.
Using layers allows you to overlay a base drawing with several different levels of detail (such as wiring or plumbing schematics over the base plan for a building). By using layers, you can also control which portions of a drawing are plotted, or remove dimensions or text from a drawing to make it easier to add or change objects. You can also lock layers, making them inaccessible but still visible on the screen. You can change anything on a locked layer until you unlock it.
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