Cropping an image along a circle in AutoCAD. How to trim a line in autocad Trim non-intersecting lines in autocad

In this lesson, we will learn the cut / cut command. lengthen and learn how to correctly cut lines with it.

The command allows you to trim the lines specified by the user, relative to objects previously selected by him, or vice versa - to stretch the lines of arcs or segments to some specific primitive in the drawing.

First of all, the program will require you to select objects. Important ! First of all, we choose not those objects that we will shorten or lengthen, but the one with respect to which we will perform trimming.

After selecting the base object, press RMB and specify those segments that we want to trim or lengthen. Important ! If we perform trimming of objects, then we need to point to that part of the segment or arc that we want to remove.

Pay attention to the hint in the command line or dynamic input: when you press the Shift key and select any object, we will lengthen it if we originally selected the “crop” command and vice versa.

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When building, very often fragments of segments, arcs, etc. are found that "crawled out" beyond the boundaries of objects, the question arises of how to cut lines in AutoCAD. To crop such fragments in AutoCAD, use the "Crop" command. Lines, rectangles, splines, rays, etc. can also be used as clipping elements.

Cropping in AutoCAD is carried out by specifying the so-called cutting edge and a fragment of the object, which, after crossing with this edge, must be removed.

The crop command in AutoCAD, like other Editing commands in AutoCAD, is very popular and easy to use if you study it in more detail. You can call the "Crop in AutoCAD" command, as always, in several ways:

1. On tab "Home" → Edit panel.

2. By entering a keyword "OBR" and then pressing "Enter".

So all the same, how to crop in AutoCAD? To answer this question, it is necessary to consider the components of cropping: how to crop lines in AutoCAD, how to crop an image in AutoCAD and how to crop an object in AutoCAD, and learn general lessons or the basics of how to work with AutoCAD. First you need to select the cutting edge (or edges), and then you have to select the objects to be trimmed.

Let's give an example of how to crop an object in AutoCAD: let's say you need to crop a part of a segment that has gone beyond the rectangle. In this case, the cutting edge will be the rectangle itself, and the cut object will be the part of the segment outside the rectangle. I have shown the whole process in the picture.

There can be many cutting edges, as well as cut objects. For example, I sometimes select all objects or most of them as cutting edges. And then I click LMB on those elements that I want to crop. Immediately after specifying the object, it is trimmed. Trimming can be ended by pressing the "Enter" or "Esc" key. Parts of the cutting edges themselves can also be cut objects.

By the way, if, when selecting cropped objects, the selection is made with the “Shift” key pressed, then the objects will not be cropped, but lengthened.

When selecting cropping objects, you can use the following options:

✗ Line and Sekramka– allow you to select cropping objects using a temporary polyline and a crossing box.

✗ Edge– enables/disables the edge continuation mode up to an imaginary intersection.

When enabled, cropping in AutoCAD will also be performed in cases where the cropped object does not clearly intersect with the cutting edge. Whether this mode is enabled or not can be seen from the command line prompt when calling the “Crop” command in AutoCAD.

If it says “Edges = No Continuation”, it means that the mode is off. You can turn it on before selecting cropping objects by entering the letter “C” into the command line (or just from the keyboard).

✗ Cancel- an option that allows you to cancel the trimming of the last object without completely canceling the execution of the entire command.

Frankly speaking, such operations are best performed following Woland's "golden" rule - "treat like with like." It is better to crop a raster image in a program that is specifically designed to work with such objects, in the same Photoshop. How to do this in Word, compressing in the browser or cropping a bitmap in AutoCAD.

After all, the idea is very simple - why insert an image on a Web page with a size of 1,000 by 800 and a volume of 20 MB, then to compress it to 150 by 100, the volume will remain at 20 - and the traffic during the download, and the space on the server's hard drive, Let's take into account that there can be up to hundreds of such pictures. Create this version in Photoshop with the desired size, and it will only weigh 100 kb. So, it's one thing to download 20 MB, and quite another thing to download 100 kb, 200 times less!

Approximately the same can be said about AutoCAD, which, with a complex drawing, creates quite voluminous files - let's not forget about 3D, shading and light sources. In general, it doesn’t hurt to always help yourself, and you can be sure that the program will help you.

However, there are different situations. In the end, there is no suitable tool at hand, and there is no time for this work. Then AutoCAD can help solve this problem - how to crop a picture, behind which the drawing is invisible.

A few fairly simple operations, almost following the example of Word

The order of work is quite simple and differs little from working in the same text process from Microsoft - Word.

We act as follows:

Advanced cropping options

But the user has more than just a simple rectangular clipping path. The outline can be anything. Moreover, you can even make an inversion - what gets inside the contour will become invisible.

To create a "broken" path:

After selecting the command for creating a contour, select the "Polygonal" mode.
Following the image, we create a polygon according to the usual rules of AutoCAD.
As the polygon is closed, cropping will occur.

It is possible that the set snapping mode will interfere with the creation of the polygon. In this situation, the mode can be temporarily disabled in the status bar.

Crop cancellation (as the above operations are also called) is performed by selecting the "Delete cropping" command for the selected image on the "Cropping" panel.

Command line option

The clipping operation on the command line corresponds to the "_imageclip" command. It is called on some versions of the program through the menu "Modify" / "Clip" / "Image" ("Transformations" / "Cropping" / "Image"). Here is the order of using the command:

First, a request to select a picture appears, if this was not done beforehand, before running the "Select image to clip:" command.
Then the general prompt appears "Enter image clipping option :" - creating a new outline (New - default), deleting it and restoring the full view of the picture (Delete), temporarily disabling cropping (OFF - it remains, just not temporarily applied yet), turning cropping back on (ON).
If the clipping construction mode is selected, then a request for its form “Enter clipping type :". By default, it is proposed to use cropping by a rectangle - Rectangular, but you can also choose a polygon - Polygonal.
When choosing a rectangle, you will need to specify its upper left - lower right corners, and when choosing a polygon - specify the corners, the polygon is initially accepted as closed, therefore, according to the rules of AutoCAD, the user does not require closure - we complete the construction by simply pressing Enter.

The last step in the construction of the drawing is the final design of the contour of the technological groove. Of course, this problem could be solved by applying the tool four times Pairing(using tool Similarity to create the top horizontal groove contour line). However, we will look at another tool that will allow us to solve this problem a little faster. This tool is called crop and it is intended for trimming lines that protrude beyond the limits of other lines or drawing objects. As with the tool lengthen, cropping is performed in two steps. At the first stage, auxiliary lines are selected, since the lines are trimmed before they intersect with them.

1. Run the tool crop by clicking on the button crop panels Change or by selecting the command from the menu Edit » Crop or by typing in the command window the command crop or simply arr. As with the command lengthen, AutoCAD in the command window prompts you to select objects that will be used as secant edges in this case.

2. Select the two vertical lines created with the tool Similarity, which indicate the right and left vertical boundaries of the technological slot contour (Fig. 2.20) and press Enter to complete the selection.

Rice. 2.20 Lines selected as secant edges

3. Select a horizontal line indicating the bottom line of the contour to the left or right of them (Fig. 2.21).

4. Repeat the operation described in step 3, but this time select the remaining segment of the bottom line that extends beyond the other secant edge.

Rice. 2.21 Selecting the right segment of the bottom line of the groove for trimming

5. Press Enter to end the command crop. All that remains for us is to create the top line of the technological groove contour, and then cut off the upper parts of the lines that we just used as secant edges.

Note. Cancel a failed command crop can be done by typing in the command window Cancel or simply O or by clicking the button Cancel toolbar standard.

6. Using the tool Similarity shift the bottom line of the groove contour up by 30 units.

7. Run the tool again crop and select the newly created upper horizontal line of the groove contour as the secant edge (Fig. 2.22).

Rice. 2.22 The upper horizontal line of the contour of the groove is selected as a secant edge

8. After pressing Enter to complete the selection of cutting edges, when prompted by AutoCAD, select the lines to be cut, first the left and then the right vertical lines, as shown in fig. 2.23. AutoCAD will immediately cut the selected lines.

Rice. 2.23 The left vertical line is cut off, now it's the turn of the right

9. Press Enter to complete the command crop. Comparing the result obtained (Fig. 2.24) with the original drawing (see Fig. 2.2), we see that the goal has been achieved. A few of the simple tools learned in this chapter will come in handy not only in the rest of the chapters in this book, but also in your daily work with AutoCAD.

Rice. 2.24 Final view of the drawing

If you feel that you are not quite confident with the instruments With lines, Similarity, Erase, Pairing, crop And lengthen, you can try to repeat the creation of the considered drawing a few more times. In AutoCAD, there are no right and wrong methods for obtaining the result - you can use a different sequence for creating a drawing or a different sequence for using tools that is different from the one suggested by the author. Alternatively, you can try to execute the drawing by launching all the tools by entering their aliases in the command window.

With practice, you can close AutoCAD without saving the completed drawing. To do this, select the command from the menu File » Exit or just press Alt+F4. (If you don't want to exit AutoCAD, just close the current drawing by selecting the menu command File » Close or by pressing Ctrl+F4.) When prompted by AutoCAD to save the drawing, click the No.

Now you are ready to study the material of the next chapter, in which we will talk about the next problem. The object shown in the drawing we just created is 470 by 400 units. In this case, we can assume that we are talking about millimeters. However, such an assumption can not always be made. For example, if we have a drawing of a power generator shaft with a length of 10 units, then what length does this part actually have: 10 mm, 10 cm or 10 m? In addition, the drawing of the office pedestal corresponds to the default dimensions of the AutoCAD window, so we had no problems in this sense either. But imagine that you really need to create a drawing of a 15-meter shaft of an electric generator with a diameter of several meters! Finally, if you are creating a drawing for foreign partners who operate not in metric, but in the imperial system of units, you willy-nilly have to create a drawing not in meters and centimeters, but in feet and inches. Therefore, in the next chapter, we will talk about how to set the drawing parameters in accordance with the task facing the AutoCAD user.

Line clipping is one of the many mechanical actions performed in drawing. For this reason, it should be fast, intuitive, and at the same time not distract from work.

This article will describe a simple mechanism for cutting lines in AutoCAD.

How to cut a line in AutoCAD

In order to cut lines in AutoCAD, your drawing must have line intersections. We will remove those parts of the lines that are not needed after the intersection.

1. Draw objects with intersecting lines, or open a drawing that contains them.

2. On the ribbon, select "Home" - "Editing" - "Crop".

Notice that the same button as the Crop command has an Extend command. Select the one you need from the dropdown list.

3. Select one by one all the objects that will participate in cropping. When this action is completed, press "Enter" on the keyboard.

4.Move the cursor to the segment you want to delete. It will get darker. Click on it with the left mouse button, and part of the line will be cut off. Repeat this operation with all unnecessary segments. Press "Enter".

If you find it inconvenient to press the "Enter" key, call the context menu in the workspace by right-clicking and select "Enter".

To undo the last action without leaving the operation itself, press "Ctrl + Z". To leave the operation, press "Esc".

This was the easiest and fastest way to cut lines, let's see how else AutoCAD can cut lines.

1. Repeat steps 1-3.

2. Pay attention to the command line. Select "Line" in it.

3. Draw a frame, in the area of which the trimmed parts of the lines should fall. These parts will become dark. When you finish building the area, the line fragments that fall into it will be automatically deleted.