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When using the Haochen CAD software to create drawings, it is first necessary to have a good understanding of the commonly used CAD commands and functions in order to draw more effectively; the CAD stretch command is one of them. Generally, when only the size of a certain dimension of a shape needs to be changed, the STRETCH command can be used to adjust the positions of some of the vertices in that shape. Next, I’ll introduce you to the usage tips for the CAD STRETCH command. The CAD STRETCH command is indeed different from other modification commands; commands such as move, copy, and scale affect the entire object, whereas STRETCH is often used to make local modifications to a shape. The method of selecting the object affects the outcome as well. The stretch command is similar to the MOVE command; the difference is that with MOVE, the entire object moves, while with stretching, only the selected vertices of the object move. If all vertices of the object are selected, then the effect is identical to that of moving the object. To stretch only a part of a shape, it is necessary to select that part from right to left; if the selection is made from left to right, no vertices will be selected, and thus stretching will not be possible. Below, we will use an example of adjusting the position of doors in architectural drawings to illustrate how to use the Stretch S command. When adjusting the position of doors and windows, it is necessary for the wall openings to change as well; in other words, as the doors and windows move as a whole, the vertices at the wall openings also move. In such cases, the Stretch command is very suitable for making the necessary adjustments. 1. Enter S, press Enter or Space, and first select the door from left to right, as shown in the figure below. 2. After confirming the selection with a space bar, click anywhere on the diagram to serve as the base point for stretching, then drag the cursor. Since all vertices of the door are selected, the door will move along with the cursor. When selecting areas from left to right, however, the vertices of the wall are not selected, so the wall does not change, as shown in the figure below. 3. Press ESC to cancel the stretch command; press Space to execute it again. This time, select the doors, windows, and adjacent walls from right to left, as shown in the figure below. 4. After confirming the selection with a space bar, move the cursor to any base point in the diagram; the vertices of the doors and walls will move along with the cursor, as shown in the figure below. 5. Move the cursor to the right of the base point; when the horizontal polar axis appears, enter 400 to move the door or window 400 units to the right, as shown in the figure below. As can be seen from the example above, the stretching operation itself is nothing special – it’s similar to moving an object. After selecting the object, you can specify a base point and a displacement point to determine the distance of movement; or, when the prompt \"Specify base point or displacement (D):\" appears, you can simply press the space bar to use the displacement method and enter the displacement values for the X and Y axes directly. The most crucial step in stretching is selecting the object; if you only want to stretch a portion of the graphic, you need to use the CROSSING method to select that specific part. The standard method is to drag to select from right to left; additionally, when the command line asks for an object to be selected, you can also enter CP to use a polygon for selection. If the shape of the graphic is complex and difficult to select, it can also be selected in multiple steps. Due to the special nature of stretching, lower versions of HaoChen CAD do not support selecting objects first before executing the stretching command; however, higher versions of CAD no longer have this limitation – it is possible to either select objects first and then run the stretching command, or to execute the stretching command first and then select the objects. The above are the tips for using the CAD stretch command in the HaoChen CAD software. CAD commands are also very important in daily drawing tasks, so it’s essential to master them well!