It is not clear whether it is a solid geometric figure or an algebraic function figure. For commonly used algebraic graphics, commonly used methods are:

First, the tracking method:

That is, function-variable list → tracking point → connecting line.

This method is usually used when the function image is known.

Second, translation method: take the basic function image as the model, translate left and right, and translate up and down.

These basic functions are: ① linear function ② quadratic function ③ inverse ratio function ④ exponential function ⑤ logarithmic function.

The key is to find the basic function.

Thirdly, symmetrical imaging method.

Is to use the symmetry of the function, first make a map of a certain area, then symmetrically image it, and then make a map of other areas.

The main characteristics of functional parity are: even function image is symmetrical about y axis; Odd function images are symmetric about the origin.

In addition, the relationship between the original function and its inverse function image can sometimes be used: the original function and its inverse function image are symmetrical about the straight line y = X.

For three-dimensional geometric figures, oblique two-measurement drawing method is mainly adopted, and the steps are as follows:

The establishment of (1) rectangular coordinate system: Take the X axis and Y axis perpendicular to each other in the known plane figure, and the two axes intersect at point O. 。

(2) Drawing oblique coordinate system: Draw the corresponding X' axis and Y' axis on the paper (plane) drawing vertical drawing, so that the two axes intersect at the O' point.

∠x'O'y' =45 degrees (or 135 degrees), and the plane they determined represents the horizontal plane.

(3) Draw the corresponding figure: the line segment of the known figure parallel to the X axis is drawn parallel to the X' axis in the vertical view, with the same length; The z-axis also remains the same.

It is known that the line segment parallel to the Y axis in the figure is drawn parallel to the Y' axis in the orthographic drawing, and its length is half of the original one.

(4) For a general line segment, we should draw a vertical line from each end point of the line segment in the original drawing, and then draw these line segments according to the above requirements, and determine the end points, so as to draw the line segment.

(5) Erase auxiliary lines: after drawing is completed, erase the X' axis, Y' axis and auxiliary lines added for drawing.

No matter what kind of graphics, it is very important to understand the characteristics of basic functions, and drawing on this basis is better!