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The CAD capture function is one of the more important functions in the drawing process of Haochen CAD drawing software, and it is also a very common function. Therefore, we need to have a good understanding of the CAD capture function. Next, I will introduce it to you in detail. Object snapping is used very frequently in actual drawings. Usually we turn on several common snapping options such as endpoints, midpoints, and intersections. Some designers turn on all snapping options to save trouble. With more snapping options open, there are many feature points in the picture that meet the conditions and can be captured. Especially when the graphics are dense, when the cursor moves to a certain position, there may be multiple lines in the capture target frame and multiple points will be captured at the same time. However, CAD can only display one capture mark at a time, but this point is not necessarily the point we want. To capture the point we need, we move the cursor to find the point we need to capture, and sometimes we need to zoom in on the graph. In fact, it is not that troublesome. When the graphics is locally complex, you can use the TAB key to switch between points that meet the conditions. Let’s first look at the application of the TAB key through a simple example of switching the endpoints and midpoints of a straight line.: 1. Turn on object snapping and set the endpoint and midpoint options. 2. Enter the L command to draw a straight line, move the cursor to a certain straight line in the picture, and then press the TAB key to see the change of the capture point, as shown in the figure below. We can see that the cursor position remains unchanged, and by pressing the TAB key, we can capture all feature points on the straight line that meet the conditions. Of course, simply capturing the endpoints and midpoints of a straight line can be easily solved by moving the cursor, without pressing the TAB key at all. Let's look at a relatively complex example. Three intersecting straight lines form a small triangle. When the cursor moves near the small triangle, we may capture an intersection or the midpoint of a line. At this time, the TAB key is very useful. As shown below: The cursor stays at the position shown in the picture, and the intersection, midpoint, endpoint, etc. of the three lines can be captured by pressing the TAB key. During the switching process, not only will the capture mark appear, but the related graphics will be displayed as dotted lines, allowing us to clearly know which line is the midpoint or which two lines are the intersection. In some cases, because there are priority settings between capture options, only the TAB key can be used to switch to the capture option we need. For example, if we turn on the capture options of the circle center and the tangent point at the same time, when we draw a straight line, we must first locate it and the tangent point, and then determine its next point. In other words, we must use deferred tangent point capture. Since the center of the circle takes precedence over the deferred tangent point, when the cursor is placed on the circle, only the center of the circle can be captured. Unless we turn off the circle center snapping option, we can directly capture the deferred tangent point. At this time, it will be easier if we know how to use the TAB key, as shown in the figure below. Many designers find it troublesome to repeatedly set capture options and simply turn on all capture options. I don’t recommend this. This will not only increase the calculation amount of the CAD software, but different snapping options will also interfere during snapping. It is recommended that you turn on several commonly used capture options, such as endpoints, key points, intersections, and circle centers. When you want to use other options temporarily, you can call them by entering commands, toolbars, or SHIFT + right-click menu, so that the overall operation efficiency will be higher. Of course, don’t forget that there is also a TAB tool available. In Haochen CAD drawing software, everyone must have a concept of the CAD capture function, but in the actual application process, how to use this function flexibly is very necessary and cannot be ignored.