The Plotting Area - HP 7470A Interfacing And Programming Manual

Graphics plotter
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The Plotting Area
The plotting area is that area of the paper in which the pen can draw.
The maximum plotting area for the HP 7470 Plotter is 191 X 272 mm
(7.5 X 10.7 in.) when the paper switch is set to A4,and is 191 X 257 mm
(7.5 X 10.2 in.) when the paper switch is set to Us. These plotting areas
permit plotting on either metric A4 size paper or English 8%-by-11-inch
paper and allow for a margin beween the plotting area and the edges of
the paper.
The plotting area should be thought of as a two-dimensional Cartesian
coordinate system. Remember, in a two-dimensional Cartesian coordi­
nate system, a point is defined by its X— and Y-coordinates; for example,
200,300 represents a distinct point where X=200 and Y=300. When
paper is loaded, the orientation of the X— and Y-axes is established as
shown in the following diagram. When looking at the plotter from the
front, the origin is located near the upper—left corner of the paper. From
now on, we will refer to that corner as lower left, since when a plot is
viewed, the minimum point is generally at the lower-left corner of the
plot.
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2-2 ESTABLISHING BOUNDARIES AND UNITS

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