In engineering drawing, it is often necessary to pick a point at a certain position relative to an existing object. For example, it is possible to pick a point from a certain distance or direction of an existing object. If the conventional method is used, the auxiliary line is often used. In order to solve the picking of these points. However, in Zhongwang CAD2006, the object capture tracking makes the user's drawing mode change greatly. It provides the visual picking of the tracking line based on the known point, so that the user can easily pick up these points and greatly improve The efficiency of the drawing. So the user can focus on the current prompt on the screen to see the current drawing situation in real time.
The purpose of tracking is to pick up another point with object capture based on what is already there. These existing points can be called temporary tracking points, and up to 7 temporary tracking points can be allowed. The object capture tracking temporarily pulls out a tracking dashed line that can intersect with other tracking lines or existing objects, which we can easily pick up. It is important to note that to use object capture tracking, at least one object capture is active.
First we need to set the object capture, right click on the "object capture" button in the status bar at the bottom of the screen, select "Settings" in the pop-up menu (or enter OSNAP directly on the command line, then press Enter), pop up "Sketch settings" Dialog box, set as follows:
Of course, object capture settings are often different in different situations.
In the specific operation, you can use the temporary tracking point, click the icon on the object capture toolbar. 
(temporary tracking point)"; at the prompt of the input point, you can also enter tt, specify a temporary tracking point after the carriage return, a small icon will appear on it, and when the cursor is moved, the automatic tracking will be displayed relative to the temporary point. By aligning the path, the user takes a point on the path relative to the temporary tracking point, which is the way to capture the target point when knowing the relationship of a point to the target point.
Of course, it is generally possible to achieve a faster purpose by pressing the function key F11 to start the object tracking mode.
Below is an example of the actual use of temporary tracking points and object tracking modes.
[Example 1] As shown in Figure 2, there is a rectangle and a point P1, which requires a new line drawn from P1 to reach the center point of the rectangle.
Type the Line command or click the icon 
After taking the starting point P1, there are two cases for obtaining the object capture mode:
1. Type tt Enter to request a temporary tracking point.
1) At this point, we take the midpoint of the lower point with the midpoint capture point, click the left button to make sure that the midpoint of the following side is the temporary tracking point, the mouse moves up slightly, and the vertical tracking alignment line appears, as shown in Figure 2. The relative coordinates can be used to obtain the target point based on the temporary tracking point, but the point we want to obtain is related to the midpoint on the right side, so we use the temporary tracking point again.
2) Type tt Enter again, specify the temporary tracking point as the right center point of the rectangle, the horizontal alignment line appears, and move the cursor to the left of the first temporary tracking point. As shown in Figure 3.
3) When the second vertical alignment line appears, you can see that the two alignment lines intersect at the same time. At this time, the point is taken, which is the center point of the rectangle.
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The above is the application of the temporary tracking point.
2. Using the object tracking mode, press the keyboard function key
1) At this point, we pause at the midpoint of the lower point with the midpoint capture for a few seconds, as shown in Figure 4. It is not necessary to click to obtain the first tracking point, which is displayed as a small triangle mark (midpoint) and leads to the vertical alignment line. .
2) Move the cursor to the midpoint of the right side of the rectangle to stop, do not click, to get the second tracking point, display as a small triangle mark (midpoint), and lead the horizontal alignment line, move the cursor to the left along the line Above the tracking point.
3) At this point, it can be seen that two alignment lines appear at the same time. At this time, the point is taken, as shown in Fig. 5, which is the center point of the rectangle.
The hint in Figure 3 is the tracking point, while the hint in Figure 5 is the midpoint. It can be seen that there is a difference between the temporary tracking point and the object tracking mode.
From the above operation, the method of using the temporary tracking point is better understood, but the object tracking mode is more convenient and convenient. Note that the temporary tracking point is clicked, and the object tracking is not clicked, but the cursor is shaken to the required position to move slightly. can.
[Example 2] To design a simple part: dig a circular hole with a radius of 20 in the center of a rectangular part.
Analysis and solution: The key is how to quickly pick the center of the circle to the geometric center of the rectangle when drawing the circle. Similar to the above, use the midpoint object tracking on both sides, as shown in Figure 6 and Figure 7.
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[Example 3] As shown in Fig. 8, a straight line is drawn, and the starting point is the intersection point of the lower side of the two rectangles.
Analysis and resolution: hook the extension mode in the object capture settings, type the Line command or click the icon Move the mouse to the lower right corner of the left rectangle, then slowly move to the upper right side, an extension line appears, then move the mouse to the lower left corner of the right rectangle. Similarly, slowly move to the upper left and an extension line appears. When you reach a certain position, the two extension lines intersect, which is exactly what we are looking for, click the left mouse button to confirm.
[Example 4] As shown in Fig. 9, a straight line L1 is known, and a straight line L2 passing through a known point and parallel to L1 is drawn.
Analytical solution: Select the parallel mode in the object capture settings, type the Line command or click the icon Click on the known point as the starting point of the line L2, the mouse moves to the line L1 and shakes it. A small parallel icon appears on the line L1, the mouse moves to the right, and an object captures a dotted line (parallel alignment line) from the known point. As shown in Fig. 9, along this alignment line, a straight line L2 requiring parallelism can be made.
Tracking along the alignment path using object snap tracking, which is based on object snap points. The acquired points will display a small plus sign (+) and up to seven tracking points at a time. After the point is acquired, when the cursor is moved over the drawing path, the horizontal, vertical or polar axis alignment path relative to the acquisition point will be displayed. For example, you can select a point along a path based on the intersection of the object's endpoint, midpoint, or object.
Object capture tracking applications are extensive, but some people don't use them. Object capture is combined with object capture tracking to better understand its superiority. Fig. 10 is an extension of the arc captured by the extension line captured by the object, and Fig. 11 is an arc extending manner intersecting the polar center axis. The extended capture, parallel capture and capture functions of Zhongwang CAD2006 complement the automatic tracking system, providing us with a powerful capture and tracking system.
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Just pay attention, start from the specified temporary tracking point, a few exercises, you can master the object capture tracking method, which will make your drawing more efficient and more accurate.
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Experience in use
When using object capture, polar axis capture tracking, and object capture tracking, the editor summarizes some of the empirical techniques that are available to the reader:
1. Object capture tracking is a combination of object capture and polar axis tracking. Before enabling object capture tracking, you should enable polar axis tracking and automatic object capture, and set the incremental angle of polar axis tracking according to the drawing needs, and set the object capture. Capture mode.
2. In the Object Capture tab of the Sketch Settings dialog box, the Enable Object Capture Tracking check box allows the user to determine whether object capture tracking is enabled. During the drawing process, you can switch the enabling or not of the object capture tracking at any time by using the F11 key or by clicking the "Object Tracking" button on the status bar.
3. Use object capture tracking with temporary tracking points. At the prompt for the input point, type "tt" and specify a temporary tracking point. A small plus sign (+) will appear at this point. "tt" is a transparent command. You can enter "tt" to specify any point as a temporary tracking point during command execution. When the cursor is moved, the automatic tracking alignment path will be displayed relative to this temporary point. If you want to remove this point, move the cursor back above the plus sign (+).
4. After the object snap point is acquired, use the direct distance along the alignment path (starting from the acquired object snap point) to specify the point at the precise distance. To specify the point, first select the object capture, move the cursor to display the alignment path, and then enter the distance at the command prompt.
5. Use the Foot, End, and Midpoint object snaps with object snap tracking to draw points that are perpendicular to the endpoint or midpoint of the object.
6. Tracking system basic shortcuts and mutual exclusion are the basis for using the entire tracking system, so in the object tracking system, do not open the orthogonal switch.
7, "Sketch Settings" → "Polar Axis Tracking" → "Object Capture Tracking Settings" option group is used to determine the mode of object capture tracking, "orthogonal tracking only" means that when object capture tracking is enabled, only the orthogonal form is displayed Tracking vector; "Tracking with all polar angles" means that if object snap tracking is enabled, when you specify a tracking point, Zhongwang CAD allows the cursor to perform vector tracking along any polar axis angle. Remind everyone not to use the default settings.
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