The plane constitutes the basic black-and-white diagram.

As shown in the figure: the position of a point in space is a point, which is the basis of all graphics. Lines are connected by countless points, and countless lines intersect on the same plane to form a surface.

Point, line and surface are the three basic elements in the picture. The three elements represent the picture through repetition, gradual change, emission and contrast. Without points, lines and surfaces, there is no graphic design.

Through the transformation between points, lines and surfaces, the picture structure is naturally displayed. How to understand and use the elements of point, line and surface well, enhance the aesthetic feeling of form and achieve the purpose of visual communication is of great significance to design.

Extended data:

Lines are usually divided into the following two categories:

1, straight line: parallel line, vertical line (vertical line), diagonal line, broken line, dotted line, broken line, etc. In Ci Hai, a straight line means that a point moves in a certain (including reverse) direction on a plane or space, and the trajectory formed is a straight line. Only one straight line can be drawn when two points are illuminated.

2. Curves: arc, parabola, hyperbola, circle, ripple line (wavy line), serpentine line, etc. The meaning of curve in Ci Hai is: the trajectory of a point whose direction changes on a plane or space due to certain conditions.

3. Expression of lines

As the most basic language of plastic arts, line has always been concerned because of its strong generality and expressiveness. Chinese painting has various linear changes of "eighteen strokes", and also has the pursuit of linear charm such as "using the bone to use the pen" and "pen death" Learning painting always starts with lines, such as sketching and sketching, which mostly appear in the form of lines.

In modeling, lines play a vital role. It is not only the contour line that determines the shape of an object, but also can describe and express the internal structure of the object. For example, lines can outline the texture of patterns, and even convey the expression of objects through lines.