In vector graphics, geometrical primitives including points, curves, lines and polygons/shapes are used. All of these are primarily based on mathematical equations and are used for representing graphical images in computers. The combination of Raster & Grid Formats and Vector Formats constitutes the GIS (Geographic Information Systems) subject materials. Vector graphics is primarily based on a number of images that consist of vectors (also known as strokes or paths).
These vectors lead through certain locations known as control points. Each of the control points has a fixed position along the x-axis and y-axis of a particular work plan. Moreover, each of these points has various databases which include the location of a point on the work space and the vector’s direction.
The direction of a vector is the one that determines the track’s direction. Each of the tracks can have an assigned color, fill, thickness and shape. This never affects the file size substantially because all of the information is stored in the structure. There are some instances when it is absolutely best to make use of vector formats and tools.
There are also other instances when using raster formats and tools is the best thing to do. Nevertheless, you might consider using the two formats together at times. To effectively use these graphic tools, it is good for a computer user to understand clearly the limitations and advantages of each of them. The relationship between the two of these tools is also necessary to study.
Some types of primitive object are the only ones supported by any vector file format. Almost all of these formats support fast rendering yet simple geometrical primitive objects such as polygons, polylines, lines, ellipses, circles, bezigon and Bezier curves. Most of the vector file formats support text, a bitmap image and color gradient. The texts supported are in some font formats in computer like TrueType wherein letters are created with the use of Bezier curves. A bitmaps image is supported because it is also considered as a geometrical primitive. Form the conceptual look, bitmap images behave as rectangles.
There are also more complex primitive objects supported by vector file formats. These include some computer- aided design applications like NURBS and Catmull-Rom splines. Other supported primitives include iterated function systems, metaballs, superellipsoids, superellipses and the like. This is not the complete list of primitives. If a particular image stored in a vector file format is being converted into another file format which supports all primitives used in that certain image, the said conversion is likely to be lossless.
There are various operations allowed by the editors of vector graphics including panning or movement without rotations, rotations, stretching, mirroring, affine transformations, skewing, changing of the z-order and combining primitive object into more complex ones. There are some more sophisticated transformations like set operations on a number of closed shapes such as union, intersection and difference. Vectors graphics are efficient in terms of simple and composite drawings which have to be independent of device. It is also ideal for applications that do not require photo realism.
Unlike the raster image format, a vector format contains a geometric description that can be smoothly rendered in any display size that one desires or needs. A vector format can also contain some bitmap image data. 3D graphic formats are vector file formats, technical wise. These formats have pixel texture mapping on a particular virtual vector object’s surface. There are instances when all of the vector graphics need to undergo “rasterization” so that they can be displayed on computer monitors. The vector art is considered as an ideal art for printing.
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