Flash: An animated graphics technology and format from Macromedia. Macromedia's Flash MX and Freehand applications, as well as many other third-party authoring programs, generate Flash files, which can be viewed through a Web browser plug-in (the Flash player) or multimedia applications that access the player directly. Flash files can include sound.
Flash uses the .FLA file extension for source files and .SWF extension for the Flash "movie" that is created and played. Flash files are widely used on the Web because the SWF format is very space-efficient. Other movie files (AVI, MPG, etc. ) files are massive by comparison and are not designed for interaction. Originally, the SWF extension meant "ShockWave Flash," which has confused people, because Shockwave is another Macromedia format created by its Director software. Shockwave files use the .DCR extension. Today, Macromedia calls the SWF format the "Small Web Format." Flash supports vector graphics images, which scale with the application window as it is resized. Animation is choreographed using one or more sequential timelines in which actions and interactions are defined. See Shockwave and vector graphics.
Shockwave A 3D animation and interactive learning technology and format from Macromedia. Macromedia Director generates Shockwave files, which can be viewed through a Web browser plug-in (the Shockwave player) or multimedia applications that access the player directly. Shockwave is used to develop more sophisticated animations and interactions than Macromedia's Flash format. Shockwave uses the .DIR (DIRector) file extension for source files and .DCR extension for the Shockwave "movie" that is created and played. See Flash, Shockmachine and shocked site.
Vector graphics or geometric modeling is the use of geometrical primitives such as points, lines, curves, and polygons to represent images in computer graphics. It is used by contrast to the term raster graphics, which is the representation of images as a collection of pixels (dots).
Overview Virtually all modern current computer video displays translate vector representations of an image to a raster format. The raster image, containing a value for every pixel on the screen, is stored in memory and the entire screen is repainted 30 or more times per second.
Starting in the earliest days of computing in the 1950s and into the 1980s, a different type of display, the vector graphics system, was used. In these systems the electron beam of the CRT display monitor was steered directly to trace out the shapes required, line segment by line segment, with the rest of the screen remaining black. This process was repeated many times a second to achieve a flicker-free or near flicker-free picture. These systems allowed very high-resolution line art and moving images to be displayed without the (for that time) unthinkably huge amounts of memory that an equivalent-resolution raster system would have needed.
One of the first uses of vector graphic displays was the US SAGE air defense system. Vector graphics systems were only retired from U.S. enroute air traffic control in 1999 and are likely still in use in military and specialized systems. The term vector graphics is mainly used today in the context of two-dimensional computer graphics. It is one of several modes a programmer can use to create an image on a raster display. Other modes include text, multimedia and 3-d rendering. Virtually all modern 3-d rendering is done using extensions of 2-d vector graphics techniques. Plotters used in technical drafting still draw vectors directly to paper.
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