1. Basic functions of rollers
 The scroll wheel is a common operation mode of CAD software. It is usually located in the middle of the mouse and can scroll up and down. The basic function of the scroll wheel in CAD software is to zoom the image. When we use the scroll wheel to scroll up, the image will become smaller and smaller; When we use the scroll wheel to scroll down, the image will become larger and larger.
 The reason why CAD software has designed such functions as rollers is to facilitate users to zoom when editing images. With the scroll wheel, users can quickly and accurately adjust the size of the image for better subsequent editing.
 Although the main function of the wheel function is to zoom the image, some CAD software also provides additional setting options in the actual use process. Users can configure the wheel function according to their own needs. For example, the user can set the zoom ratio of the scroll wheel when zooming the image, as well as the sensitivity of the scroll wheel.
 2. How to use the roller
 In CAD software, it is very simple to use a wheel to zoom an image. Just move the mouse cursor over the image to be zoomed, and then use the wheel to scroll up or down. The scroll speed and direction of the scroll wheel will directly affect the zoom degree of the image.
 In addition to using the wheel to zoom the image, CAD software also provides other zoom methods. For example, you can zoom through the menu bar or shortcut keys. But compared with these methods, the scroll wheel is more intuitive and simple, and can better adapt to the user's operating habits.
 3. Advantages and disadvantages of rollers
 As a common operation mode in CAD software, roller has many advantages. First of all, the wheel operation is intuitive and simple. Users can complete the zoom operation by simply rolling the wheel, without complicated operation steps. Secondly, the wheel operation is fast and efficient, which can help users save time and energy. Finally, the wheel operation is flexible and convenient, and users can adjust the wheel settings according to their own needs to achieve the best operation effect.
 However, the roller also has some disadvantages. First, the scroll wheel can only be used to zoom the image, not to pan the image. This may cause inconvenience under certain circumstances. Secondly, the sensitivity and rolling speed of the roller may be affected by external factors, resulting in reduced accuracy and stability of operation. Finally, different CAD software supports different rollers, which may lead to incompatible problems when operating between different software.
 For these shortcomings, users can solve them through appropriate settings and operating skills. For example, when zooming, you can combine the wheel with other operation methods to achieve better operation results. In addition, users can also choose appropriate CAD software according to their own usage habits to meet their work needs.
 4. Summary of roller functions
 By elaborating the functions of CAD rollers that can be zoomed but not panned, we can draw the following conclusions:
 First, scroll wheel is a common operation mode in CAD software, which is used to quickly and accurately scale images. The operation method of the scroll wheel is simple and intuitive, which can help users save time and energy.
 Secondly, although the main function of the scroll wheel is to zoom the image, in actual use, the setting options and operating skills of the scroll wheel can further improve the operating experience and efficiency.
 Finally, the roller also has some disadvantages, such as it can not be used to translate the image, and the operation is unstable due to the influence of external factors. However, these problems can be solved through appropriate settings and operating skills.
 To sum up, as one of the important operation modes in CAD software, roller has certain advantages and disadvantages. When users use rollers, they need to reasonably configure and use them according to their own needs and habits to achieve better operation results.