What are the drawing methods of isometric drawing of a circle, such as four-center method? Please describe several in detail.

Step 1: Draw the vertical OZ axis, draw the OY axis from point O to the lower right at 120 degrees, and then rotate 120 degrees to draw the OX axis. The second step is to select the most representative face of the object and put it in front of us. Squint and imagine what shape it will be projected on the XOZ plane. This is the "front view".

Step 3: Put the object in the arm direction and pull it down so that the front view is attached to the desktop. Then look at the number on your chest. This is a "top view". The fourth step is to "pull up" to form the position of the front view, and then push the right side of the object back at a right angle so that the left side can reach our chest. Look at the shape of your chest and draw it.

note:

1. There are two ways to choose the "deformation coefficient" of each "length, width and height". One is 1 higher than 1. If this method is to draw a "circle", the diameter of the circle, that is, the long axis of the ellipse, will be 1.2 times the actual circle diameter. The results show that the long axis of the ellipse is equal to the diameter of the actual circle, but the lengths of many straight sides are "slightly shorter". In short, each has its own merits, but many people prefer to use 1 instead of 1 because the calculation process is much easier.

2. In the painting method of "positive quantity", there is a principle that it is a rotating body with multiple purposes; Polyhedron, try to use this method as little as possible.

3. If you draw three pictures, there is absolutely no "horizontal line". If you do this, it will be a big joke.

You can understand the above.