Every CAD system needs to provide hardcopy versions of circuits. Whether on paper or film, the permanent image is useful for offline consideration and for documentation. Although hardcopy graphics techniques are essentially the same as those found in display programming, there are other considerations. As a first step, it is necessary to understand the nature of these plotting devices.
Like displays, plotters fall into two broad categories: raster and calligraphic. Raster devices such as laser and ink-jet printers cover every pixel on the page and can produce arbitrarily complex images. Calligraphic devices such as pen plotters and some film recorders have a single writing head that must be moved to draw.
Unlike displays, the intensity resolution of plotters is generally low. Many hardcopy devices are strictly bilevel, able only to plot a black dot or to leave the spot white. Color printers have additional sources of ink but can still place the inks with only one intensity. Pen plotters can sometimes fake intensity by drawing over an area multiple times, but there is a limit to what the paper can endure, so these plotters still have only a few intensity levels. Essentially, the variations of layer appearance must be faked with patterned areas.
Buy me a Cup of CoffeeLike displays, plotters fall into two broad categories: raster and calligraphic. Raster devices such as laser and ink-jet printers cover every pixel on the page and can produce arbitrarily complex images. Calligraphic devices such as pen plotters and some film recorders have a single writing head that must be moved to draw.
Unlike displays, the intensity resolution of plotters is generally low. Many hardcopy devices are strictly bilevel, able only to plot a black dot or to leave the spot white. Color printers have additional sources of ink but can still place the inks with only one intensity. Pen plotters can sometimes fake intensity by drawing over an area multiple times, but there is a limit to what the paper can endure, so these plotters still have only a few intensity levels. Essentially, the variations of layer appearance must be faked with patterned areas.
MONIKA YADAV (MCA),
Software Engineer,
www.NotesGuru.in, Indore
ROHIT KESHRIYA (MCA),
Software Engineer,
www.NotesGuru.in, Indore
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