First, determine the type of graphics to be counted, such as line segment, ray, angle, triangle, rectangle, parallelogram or other types of graphics.

Second, according to the type of graphics, choose the appropriate simple method. For example:

1, when counting line segments, you can correspond line segments one by one, and then count the number of corresponding relationships.

2. When calculating rays, it can be calculated according to the number of ray endpoints.

3. When calculating angles, you can classify them according to the size of the angles, and then count the number of various angles.

4. When counting triangles, you can classify them according to the side length of triangles, and then count the number of all kinds of triangles.

5. When counting rectangles, you can classify them according to their length and width, and then count the number of all kinds of rectangles.

6. When calculating parallelograms, we can classify them according to their bases and heights, and then calculate the number of various parallelograms.

Third, if you encounter more complicated graphics, you can first decompose the graphics into several simple parts, calculate the engineering quantities respectively, and then add them up.

Fourth, if there are many graphs to be calculated, you can use a counter or program to calculate them quickly.

Matters needing attention in digital graphics

1. Determine the types and characteristics of graphs, and adopt different counting methods for different graphs.

2. Count in a certain order and law to avoid omission or repetition.

3, pay attention to the relationship between the graphics and the combination way, the complex graphics are decomposed into simple parts for counting.

4. For some special graphics, you need to use mathematical knowledge and other skills flexibly to solve them.

5. When solving practical problems, we need to pay attention to the restrictive conditions and requirements in the topic and correctly apply mathematical knowledge to solve practical problems.