Join Jeff Bartels for an in-depth discussion in this video Creating boundaries, part of AutoCAD 2009: 2D Drafting Techniques.
The Boundary command could be a tremendous time saver when drafting. Now Boundary function is very similar to the Hatch command, except that it's job is to create closed polylines. In this session, we are going to take a look at how we can use the Boundary command. Take a look at the area created by these shapes. This is the area that I'm interested in. I like this X shape to be its own closed polyline. Now I could create this my trimming my geometry and then joining it together. I can also painstakingly trace the edge, but there is a faster way. I'm going to use the Boundary command. I can find boundary in the Draw panel of my ribbon.
I'm going to click the flyout. Boundary is located right here. Let me click the Launch the Tool. Now Boundary acts very much like the Hatch command. If I look at the middle of the dialog box, I can see that I'm going to be creating a polyline and we are going to be creating it using the Pick Points method. Let's click Pick Points. I'll click inside the shape. AutoCAD traces the boundary and I'll right-click to finish. I am going to use the Move command and we'll move this geometry outside and I'm sure you will agree that it's much faster to create a boundary than it is to trace that manually. Now we don't have to stop with a single boundary. If we launch the command again, I'm going to come up and click the Draw panel, so like the command. We'll click Pick Points. I'm going to click inside this shape and this shape and this shape and this shape and when I'm finished I'll right-click. Each of these is its own individual closed polyline. Let me hit Escape to deselect.
Couple things to remember about the Boundary command. When you create a boundary, AutoCAD creates it on the current layer. You can see these guys were created on layer area. One other thing, when we are generating a boundary we have to make sure we have closed geometry. Take a look at this. This geometry obviously has a problem. Let's try and create a boundary from this interior shape. I'm going to launch the command by right-clicking. I'm going to select Repeat Boundary. We'll click Pick Points and then we'll click inside this shape. Now in my case, the gap is obvious. If you get this error you have a problem with your geometry. Let's close this. I'm going to hit Escape to cancel the command. Let's take a look at what we can use the Boundary command in a real world example.
I am going to pan my geometry over. On my screen I have got an architectural floor plan. This is the back portion of a house and behind the house I have got a wooden deck and this cyan line represent a concrete patio. Let's use the Boundary command to find out the square footage of our patio. To do that we'll launch the command. I'll click my Draw panel and we'll select Boundary. I'll click Pick Points and I'll inside the shape and right-click. When I'm finished I'll select the shape. We'll go over to the full Property palette and I can see the area of my concrete patio is approximately 300 square feet. I'm going to move outside the palette. Let it collapse and then I'm going to hit my Escape key to deselect. The next time, you need to calculate an area or trace some line work, consider using the Boundary command. Boundary is the fastest way to generate polylines in AutoCAD.
- Creating boundaries and calculating areas
- Producing gradient fill hatch
- Matching properties
- Dividing and measuring line work
- Finding parallels and extensions
- Making selections based on criteria
- Filtering layers
- Applying new skills using practical examples