Graphic objects – HP 48g Graphing Calculator User Manual
Page 109
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Graphic Objects
Graphic objects (or grabs) encode the data for HP 48 ‘‘pictures,’’
including plots of mathematical data, custom graphical images, and
representations of the stack display itself. The HP 48 provides a
PICTURE environment for viewing and editing graphic objects.
Like all objects on the HP 48, graphic objects can be put on the stack
and stored in variables. On the stack, a grob is displayed as
Graphic
n ':■ < rn
where n and m are the width and height in pixels. (A pixel is one
picture element, or “dot,” in the display.)
The HP 48 uses two kinds of graphic objects:
■ Plots.
These are graphical representations of functions, equations,
and sets of data that are automatically generated by the PLOT
application. The HP 48 can zoom plots in any of 15 ways, and can
numerically analyze function plots.
m Pictures.
These are free-forrn grobs created “pixeL by-pixel”—either
automatically using “snapshot” commands, or manually using the
Picture Editor.
Graphic Objects 9-1