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Among computer-aided design software, AutoCAD is undoubtedly the most commonly used. The tips introduced here are difficult to get from books. They often play a great auxiliary role in actual drawing. Let’s take a look.^_^. Polygon drawing AutoCAD can create equilateral polygons with sides ranging from 3 to 1024. When drawing, you can choose the inscribed circle method or the circumscribed circle method. Generally, we complete it by directly inputting the value of the side length or selecting the endpoint. In fact, we can also draw by specifying the two endpoints of a certain side of the polygon. This is especially suitable when part of the figure has been drawn. This requires the use of the "Edge" parameter in the "Polygon" command. When we click the "Polygon" button or enter the "Polygon" command, we first need to enter the number of sides of the polygon according to the prompts. Next, we need to select the "Edge" parameter, and then capture the two endpoints to complete the drawing of the polygon. This way * * Save drawing time. Make good use of the parallel relationship command "Offset" (parallel relationship) command to translate the object a specified distance and create a new object similar to the original object. The primitives it can operate include straight lines, circles, polylines, construction lines, spline curves, etc. When translating a circle, it can also create concentric circles. ； When you translate a closed polyline, you can also create a closed shape with the same shape as the original object. Because of this, the "Offset" command has become the most frequently used command among the AutoCAD editing commands. When using "Offset", users can create new line segments in two ways. One is to enter the distance between parallel lines. ； The other method is to specify the point through which the new parallel line passes. After selecting the parameter "Through", capture a certain point as the passing point of the new parallel line. This way, there is no need to enter the distance between the parallel lines, and it is not easy to make mistakes. For the input of special symbols, we know that "Ф" indicating diameter, "±" indicating ground level, and the degree symbol "°" can be entered using the control codes %%c, %%p, and %%d, but what if you want to enter other symbols? We can enter special characters through the "Character Map": 1. Enter the "MText" command, then create a text box, and then the "Multiline Text Editor" dialog box will open. In this dialog box, we can see that one of the four buttons on the right is the "Symbol" button ； 2. Click the arrow in the lower right corner of this button to open a drop-down list. We can see that there are several options: "Degress %%d", "Plus/Minus %%p", "Diameter %%c", and "Other". The first three options are used to enter the "°", "±", and "Φ" symbols, which saves us the trouble of remembering special control codes. 3. When you click "Other", the "Character Map" dialog box will open, which contains more symbols for users to choose from. In the "Character Map" dialog box, select the characters you want to use, then click the "Select" button, and then click the "Copy" button to copy the characters to the clipboard. Click "Close" to return to the original dialog box. Place the cursor at the position where you want to insert the character. Use "Ctrl+V" to paste the character into the current window. Quickly draw a tangent circle. The connection relationship between one graphic element in a plane graphic and the smooth transition to another graphic element is tangent. At the beginning, the author always uses the method of radius addition or radius subtraction to draw tangent circles. In fact, when we use the circle drawing command, we only need to use the parameter "Ttr" to specify a tangent circle, then select the tangent objects A circle and B circle respectively, and then enter the transition circle radius to easily create a tangent circle.