Plane composition-it is the product of the combination of reason and sensibility. All the visible visual elements used in the plane structure of the frame are called images, and the basic modeling is the most basic image; Restrict and dominate the various arrangements of basic forms in plane composition, that is, skeleton. The basic forms are "positive" and "negative", which can also be transformed into each other in composition; When the basic forms meet, they can produce several relationships, such as separation, contact, overlap, penetration, combination, deletion, difference overlap and overlap. Bones can be divided into functional bones that work visually, inactive bones that don't work visually, and regular bones (i.e. repetition, approximation, gradual change, emission, etc. ) and irregular bones (that is, dense bones, contrast, etc.). ). These characteristics of the basic form and skeleton will influence, restrict and interact with each other, forming an ever-changing composition pattern (as shown in the following figure, the basic form is formed by repetition, contact and overlap, etc. Plane composition is the basic plane composition of design, which is mainly composed of points, lines, surfaces and rhythms. It has a rigorous structure and a strong sense of abstraction and form. Compared with specific forms of expression, design works with various practical characteristics and creativity are more extensive. It is a visual art language that must be learned to use before the actual design and application, to carry out visual creation, to understand the concept of modeling, to train and cultivate all kinds of skilled composition skills and expression methods, to cultivate aesthetic and aesthetic cultivation and feelings, to improve creative activities and modeling ability, and to actively conceive. Plane skeleton: regular, semi-regular, irregular, single skeleton, composite skeleton, inactive skeleton, active skeleton type: repeated composition, variation, gradient, emission, texture, approximate composition, dense composition, segmented composition, specific composition, spatial composition, contradiction space, contrast composition, balanced composition 1. The basic format of plane composition (the basic format can be roughly divided into 90-degree arrangement format, 45-degree arrangement format, circular arc arrangement format and broken line arrangement format) 2. Repeated composition form (with a basic simplex as the main body and repeated arrangement in the basic format, the arrangement can change the direction and position, which has a strong formal aesthetic feeling)-simple repeated composition-repeated 3 times. Approximate composition (composition between similar forms, including "change" in "unity") is the characteristic of approximate composition. In design, the approximate basic shape is usually obtained by increasing or decreasing the basic shape. 4. Gradient form (the form in which basic shapes are gradually arranged according to the relationship between size, direction, virtual reality and color)-the gradient of shape size and direction-the gradient of density-the gradient of virtual reality-the gradient of color. 5. Emission form (with one or more points as the center, showing the visual effects of emission and diffusion around) has a strong sense of movement and rhythm)-one-point emission form-multi-point emission form-rotary emission form 6. Spatial form (spatial form on the plane obtained by using the principle of viewpoint, vanishing point and apparent horizon in perspective)-three-dimensional space formed by the density of points-three-dimensional space formed by line change-space formed by overlapping-space formed by perspective law (in perspective, contradiction space's composition (illusion space composition): unreasonable space formed by changing the viewpoint and vanishing point of three-dimensional space form, and "inverted space" is important for contradiction space. 7. Specific composition form (make a small number of variations in a more regular form to break through the more standardized monotonous composition form. Specific composition factors include shape, size, position, direction, color, etc. The proportion of local changes should not change too much, otherwise it will affect the contrast effect between the whole and local changes. 8. Segmentation form-isomorphic segmentation (more rigorous form)-equal division (only seeking the consistency of proportion, not seeking the unity and freedom of types) 9. Texture forms (texture refers to the surface morphology of objective natural objects, which is the surface characteristics of various object attributes), and making more texture patterns: dripping color method, watercolor method, ink painting method, wax color method, tearing and pasting method, embossing method, dry pen method, wood grain method, vein method, rubbing method and salt water color method is a special repetition, and the basic shape or bone unit revolves around one or more central points. Flowers in full bloom in nature belong to the shape of emission. In addition, emission can also be said to be a special gradual change. It is the same as gradient, and the skeleton and basic shape should be changed in an orderly manner. But the launch has two remarkable characteristics: first, the launch has a strong focus, usually located in the center of the picture; Secondly, the emission has a deep sense of space, and the movement of light makes all graphics concentrate to the center or spread from the center to the surrounding. In geometry, a straight line is the trajectory of a point moving. It has position and length, but no width and thickness. In plane composition, the line is still characterized by its length. As long as the thickness of a line is limited in a specific range and still shows sufficient continuity compared with other visual elements, it is called a line. For example, the intersection of faces must form a "line". A line is a one-dimensional space with length. In shape representation, it is the same as the width and area of a point.