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##

PERSPECTIVE

[GREG2\]PERSPECTIVE [Altitude Azimuth] [/FACTOR Fv Ov] [/LOWER]
[/LINES] [/STEP Nsx Nsy] [/AXES Xmin Xmax Ymin Ymax] [/CENTER] [/VERTI-
CAL Vmin Vmax]
Makes a parallel projective view of the Regular Grid array, with hidden
lines removed. If /LINES option is present, lines along a single axis
are plotted. Altitude and Azimuth are the values of the corresponding
viewing angles in Degrees. Default values are 30 and 45 at the begin-
ning, and then the last values given. The upper part is drawn, unless
the /LOWER option is present.
Automatic scaling to match approximately the current box is used, but it
is only a rough guess and may fail if extrema of the Regular Grid occurs
near the edges. Fine tuning of the plot scale can be obtained using the
/FACTOR option. It controls scaling of the Regular Grid values by the
factor Fv (default 1) and an offset Ov which is in physical units along
the Y direction of the plot.
The Regular Grid array is plotted according to the orientation implied
by command LIMITS, but the whole array is plotted. The /STEP option may
be used to indicate to take only 1 pixel over Nsx ones for the X axis
(resp. Nsy and Y). The /AXES option plots (X,Y) axes. The /VERTICAL op-
tion controls the max, min of plotted perspective and plots a Z axis.
The /CENTER option centers the perspective. BLANKED PIXELS are forced to
the minimum value of the map, or the Vmin value when the /VERTICAL op-
tion is in use.

Gildas manager
2020-07-04