1. First, the computer opens the CAD software, as shown in the figure below, and then goes to the next step.
2. Secondly, after opening CAD, enter the fill command H at the following command line, as shown in the figure below, and then enter the next step.
3. Then, after confirming the fill command, click the pattern fill tab in the pop-up window, click ... on the right side of the pattern, as shown in the figure below, and then go to the next step.
4. Then, enter the fill pattern palette page, select the RROOF pattern, click OK, as shown in the figure below, and proceed to the next step.
5. Then select the pattern, change the angle to 45 degrees in the dialog box, and then click the selected object on the right, as shown in the figure below, and then enter the next step.
6. Finally, after selecting the filling object, click OK to fill it, as shown in the figure below. In this way, the problem is solved.