Join Shaun Bryant for an in-depth discussion in this video Using coordinate systems, part of Cert Prep: AutoCAD Certified Professional (2015).
- We're now in the next video of the Drawing with Accuracy section of our AutoCAD Professional Certification Course. And we're going to be looking at drawing with coordinates. Now, you'll notice I've got the 4 Drawing with Accuracy COORDINATES Complete drawing open. You can see the tab here. However, you will use the 4 Drawing with Accuracy COORDINATES.dwg file that you'll get with your exercise files from lynda.com. Now, what I've drawn here for you in preparation for this particular video, is just four lines.
Can you see? We've got one, two, three and four. Each of those lines is 400 units long, and the lines actually start here at the X and Y, the 0,0 coordinate because AutoCAD uses a Cartesian coordinate system with X and Y-axis intersecting at 0,0. You'll probably remember that from mathematics in school. Now, what we're going to do is look at how those coordinates work when you're drafting in AutoCAD itself.
So, go to your Layers panel here, make sure that Lines is the current layer. There's only two layers in this drawing, the 0 default layer and Lines. But make sure you're using Lines because it's green and then it stands out. Then go to the Home tab on the ribbon, if you haven't already, to go to the Layers panel, and we're going to use the Line command here. So, I click on Line in the Draw panel, I come into the drawing area now. And because I've got the dynamic drawing input switched on, as I move around, can you see, I'm getting a coordinate readout of the cross hair as I move around.
Now, that coordinate readout is also down there on the status bar, you'll notice as well, where the drafting settings are. And the good thing is, I can type in coordinates of where I want my line to actually start. So, I might want my line to start at say, 200,200. So, I just type it in. So that's the X value and the Y value. And it's a total between the two coordinate boxes there. You'll either hit the Comma key or the Tab key. I know press Enter to confirm that first point and you'll see that my line has started dead center of that square that I've already drawn.
That's because it's gone 200 along and 200 up, using the X and Y coordinates. And because they were both positive coordinates, the X value has gone to the right, the Y value has gone upwards. So now, if I come across and use some direct distance entry, I can actually specify the length of that line. But let's say I want the next point of that line to be the corner, the top right corner of that square. Now, I know that that's going to be 400,400 because the lines are all 400 long, and starting at the coordinate 0,0.
So, if I just type in 400 now, and then press Comma, can you see the dynamic input updates to coordinate input? So, if I type 400 again, and just press Enter now. That takes my line to that corner, like so. Now, you would've thought that it would have gone to that corner there. It hasn't. What it's done, it's automatically assumed that we're going relative from the original 200,200 coordinate. So, that coordinate, 400,400, you'll notice there, just above the command line, it's gone at 400,400, so that "at" means that it's a relative coordinate.
So, it's taken 400 along the X direction to the right, and 400 up Y direction positive as well, from the original 200,200 point. Now if I'd wanted that to actually go to the actual absolute 400,400, I would've had to of put a different value in front of that coordinate and that would've been the hash symbol instead. So, as it is, I've now got a line that is actually 400 long instead of a line that should go from 200,200 to 400,400.
AutoCAD defaults to relative coordinates. So, as soon as I clicked on that line command and started there, it's looking for a relative input. An at symbol. And it does it automatically. Unless you put a hash symbol in to confirm that you want absolute coordinates instead. So, that's how coordinates work in AutoCAD. So, let's have a look at that one more time. Let's work that out. So, we'll go to the Line command here, like so and I'm going to start up here.
Now, because I know that that's gone 200 farther now, that actually coordinate if you look down at the coordinates on the status bar there, is 600,600. So, if I click there now and come downwards, you can see there that I can actually type in a direct distant entry or I'm going downwards on the Y-axis. So that's negative. So, if I now type in 0,-600 that will take that line vertically downwards when I press Enter, it takes it down to there.
So you can see that those coordinates, if they are negative, they just go in the opposing direction. So, a negative coordinate can be input as well, it's just a different direction. It's the opposing direction to the positive direction. So X to the right horizontally is positive, Y upwards is positive. The other directions are negative and you will have to input a negative symbol in front of your coordinate values for that to work. But that's basically how you work with coordinates when you're working in AutoCAD.
Practice with your coordinates for your AutoCAD Professional Certification Exam.
- Creating and publishing AutoCAD files
- Drawing shapes and lines
- Creating isometric drawings
- Transforming objects
- Creating and using arrays
- Organizing objects and layers
- Reusing content with blocks
- Adding text, dimensions, multileaders, and scales
- Creating layouts
- Setting printing and plotting options
Skill Level Appropriate for all
Q: Is this certification available for AutoCAD for Mac users?
A: AutoCAD certification is on the Windows environment only. Currently Autodesk does not have plans for an AutoCAD for Mac certification.
Q: This course was updated on 02/01/2016. What changed?
A: We added four new videos to the "Certification: What Is It?" chapter. These tutorials cover Certiport, the online certification service that now offers a variety of Autodesk certifications.