Join Jim LaPier for an in-depth discussion in this video The geometry of your geometry, part of Learning AutoCAD for Mac.
We are almost ready to start drawing in our AuotCAD application. But first, let's take a quick look at the common components our geometry will have, as it will be the information we use to both create and modify our geometry in the future. Here, I have a line, a circle and a rectangle. If I select each of these, I see the lines become shown dashed, to show that they are actively selected, and I have these blue boxes at different points on the objects. These blue boxes are called grips, and they are the bounding information of our shapes.
For example, our line has three grips, one at each end point, and one at the midpoint. The circle has five, one at each of the four quadrant points, and one at the center point. These grips are tied to the geometry of the shape and abide by the geometric rules of each shape. For example, the midpoint of a line is always equidistant from the endpoints. So if you move the endpoints, the midpoint moves accordingly. If you move the midpoint itself, both the endpoints, and therefore, the whole shape, move. If I move the center point grip of the circle, the entire circle moves.
And if I move the quadrant grip, the circle stretches accordingly. As we work with drawing lines and moving objects, we're constantly asked for reference points, for which we can use the geometry of objects already created. These objects can be referenced using what are called Object Snaps which allow you to literally snap to the appropriate geometry of the objects. These can be typed in any time AutoCAD asks for a point. So, we can type end for endpoint, mid for midpoint and so on. For a list of these, type osnap in the command prompt.
Rather than always typing the object snap we want, we can select these boxes and enable running object snaps that will always be looking for object geometry when AutoCAD asks for a point. Each osnap is represented by a different symbol, a square for the endpoint, or a triangle for midpoint, and so on. Eventually, you'll know these by site. But if you are not sure what osnap AutoCad is calling out, hover over the symbol, and a tool tip will appear with the name of the osnap. If you ever find AutoCad can't seem to grab the right snap point with running osnaps, whether it just doesn't pop up, or there are too many, too close to differentiate, you can type the osnap you want as a temporary override and only the one you type will be looked for.
The geometry of the objects we create not only defines the parameters of the shapes but is also incredibly useful in modifying the shapes in the future, or creating new objects.
This course was created and produced by Jim LaPier. We're honored to host this content in our library.
- Accessing the palettes
- Adjusting user preferences
- Working with different file types
- Editing polylines
- Modifying objects
- Controlling layers
- Creating blocks
- Building layouts
- Adding annotations
- Working with 3D geometry