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We have introduced the problem of abnormal CAD graphics display in Haochen CAD software in more detail in the previous article, but in fact, in the process of using Haochen CAD software to draw drawings, I have just started to learn CAD.* Friends may also encounter other graphics problems. Let's continue to introduce the CAD entry skills about abnormal graphics display! The drawing is not centered after double-clicking the middle mouse button. When using Haochen CAD software to draw, many people will ask why the drawing is not centered after double-clicking the middle mouse button. It is offset to a corner of the window. However, when selecting the frame, there is no drawing in the blank space, as shown in the figure below. In fact, the reason for this situation is: There are graphics in the blank space of the graphics, but these graphics are not visible and cannot be selected by the box. In lower versions of CAD, empty text, zero-length straight lines, and incorrect fills may be created. Higher versions generally do not have such problems. The higher version of the PU cleaning function specifically provides the function of cleaning empty text and zero-length graphics. Solution: First use the Clean PU function to clean up the empty text and zero-length geometric figures, and then try to display the entire image. If it still doesn't work, select CTRL+A, hold down the SHIFT key, select the graphics you want to keep, invert the redundant graphics, and delete them. There are two invisible filled objects in the netizen's drawing, while the example picture in the west has more than 200 empty text objects, as shown in the picture below. After deleting, double-click the middle mouse button and the graphic will be centered, as shown in the figure below. CAD graphics can be seen in the layout space, but not in the model space. Graphics can be seen in the layout space, as shown in the figure below. When you arrive in the model space, you can only see a few straight lines, but you can select these graphics during frame selection. After getting the drawing, I opened it and selected a graphic in the layout space. I found that the color of the CAD graphic was actually the true color 0,0,0 (that is, black). Because the background color of the CAD model space is also black, these graphics are the same color as the background, so they cannot be seen. If the background of the CAD is not the traditional black, but a high version of gray, these graphics can be seen, as shown in the figure below. If the graphic is index color No. 7, CAD will automatically invert the graphic color based on the background color. However, since the true color black is set, CAD does not perform such processing. The background color of the layout space is white and the graphic can be seen. The background color of the model space is black and the graphic cannot be seen. Solution: After selecting the CAD drawing, just set the color to color No. 7 of the BYLAYER or index color of the layer. The viewport boundary or part of the graphics cannot be seen. The layers in the drawing are neither closed nor frozen, but the frame and viewport in the layout are not visible. In fact, the frame and viewport in the drawing space are set to be invisible. But CAD does not provide such a command. It is obvious that some professional software or plug-in has made this setting. Graphics in the viewport and paper space can be selected using Select All or Quick Select, but they cannot be seen. Viewports can also be entered, but since the viewport boundaries cannot be seen, a viewport cannot be selected for editing. Solution: The command to restore the visible graphics in Tianzhengzhong is: HFKJ (should be the first letter of the pinyin for "restore visible" in Chinese). If you encounter similar problems but cannot find the command to restore visibility in the Tianzheng menu, just enter HFKJ directly and try. The problem of invisible graphics should be caused by Tianzheng, otherwise Tianzheng would not add such a command. If you have not used Tianzheng and have similar problems, you can try the LISP program inside. In the above two articles, we have summarized the graphics abnormality problems that are likely to occur during the drawing process of Haochen CAD software and the corresponding solutions. When you are just starting to learn CAD * Friends can refer to it when drawing in the future.