The figure is composed of external contour lines Vectorgraph 。 That is, straight lines, circles, rectangles, curves, charts, etc. drawn by computers. A set of instructions is used to describe the content of a graph, such as the various components that make up the graph Elements position dimension , shape, etc. The description object can be arbitrarily scaled without distortion. In terms of display, special software is used to convert instructions describing graphics into shapes and colors on the screen. It is suitable for describing objects with less complex outlines and rich colors, such as: Geometry , engineering drawings CAD , 3D modeling software, etc. Its editing usually uses the Draw program to generate Vectorgraph Shape, which can move, scale, rotate and twist vector graphics and primitives independently. The main parameter is description Elements The instructions and parameters of the position, dimension and shape of the. (1) [figure]
(2) Portrait
crystal Beautiful graphics (3) It refers to drawing the outline, shape or external boundary of an object
Geometry [1]
(4) In some cases, a line can also be called a shape.
1. Portrait, drawing image.
《 Song Dynasty Book ·Ritual Annals IV: "Since the Han Dynasty, there have been many people who have been good and virtuous《 New Tang Dynasty Book ·The Legend of Fang Ji · Zhang Guo: "There are imperial edicts Jixian Academy , plead to return the mountain, and make an edict. " 2. Pattern. The shape of an object represented on paper or other surfaces. See "Drawing"（ Point line face Composition). 3. Short for geometric plane figure. [1]
4. Graphics in the software. Many software also use graphics to enrich user data. For example, in the famous Word, Excel perhaps Table Controls such as Spread Shape shapes are often seen in. Users can create a star or other image in a form to highlight Display Data Or give the user some instructions Worksheet Specific aspects of. Next, you can customize the size of this star or image, Background color , rotation angle or gradient effect. The following is a programming example of custom graphics using Spread as an example. Differences between graphics and images
stay computer science The two concepts of graph and image are different: graph generally refers to the picture drawn by computer, such as straight line, circle, arc, arbitrary curve and chart; The image refers to the image created by input device The captured actual scene picture or any picture stored in digital form. The image is composed of some arranged pixels Storage format With BMP, PCX TIF , GIFD, etc. Generally, the data volume is relatively large. In addition to expressing real photos, it can also express some details of complex paintings, and is flexible and creative. Unlike the image, only the algorithm for generating the graph and some characteristics of the graph are recorded in the graph file, also known as Vectorgraph 。 During computer restoration, the adjacent features are connected with many specific small straight lines to form a curve. If the curve is a closed figure, the coloring algorithm is also reliable fill color 。 Its biggest advantage is that it is easy to move, compress, rotate and twist, and is mainly used to represent wireframe drawings Engineering drawing 、 Fine art characters Etc. frequently-used Vector graphics file 3DS (for 3D modeling) DXF (for CAD), WMF (for Desktop publishing ）Etc. Only algorithms and Characteristic point , so compared with a large amount of bitmap (image) data, it occupies storage space It is also small. But because every time Screen display Every time Recalculate , so the display speed is not as fast as the image. In addition, in the Printout And zooming in, the quality of the drawing is high Lattice diagram (Image) Regular meetings Distortion occurs. 
