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A Library for Handling
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Description:
This routine draws a set of markers
(symbols) at positions specified in the physical coordinate system of a
Plot. The positions are
transformed into graphical coordinates to determine where the markers should appear
within the plotting area.
Invocation
CALL AST_MARK( THIS, NMARK, NCOORD, INDIM, IN,
TYPE, STATUS )
Arguments
THIS = INTEGER (Given)
Pointer to the Plot.
NMARK
= INTEGER (Given)
The number of markers to draw. This may be zero, in which case
nothing will be drawn.
NCOORD = INTEGER (Given)
The number of coordinates being
supplied for each mark (i.e. the number of axes in the current
Frame of the Plot, as given by its
Naxes attribute).
INDIM = INTEGER (Given)
The number of elements along the first
dimension of the IN array (which contains the marker coordinates). This value is required so
that the coordinate values can be correctly located if they do not entirely fill this array.
The value given should not be less than NMARK.
IN( INDIM, NCOORD ) = DOUBLE
PRECISION (Given)
A 2-dimensional array giving the physical coordinates of the points where
markers are to be drawn. These should be stored such that the value of coordinate number
COORD for input mark number MARK is found in element IN(MARK,COORD).
TYPE =
INTEGER (Given)
A value specifying the type (e.g. shape) of marker to be drawn. The set of
values which may be used (and the shapes that will result) is determined by the underlying
graphics system.
STATUS = INTEGER (Given and Returned)
The global status.
Notes:
-
Markers are not drawn at positions which have any coordinate equal to the value AST__BAD (or
where the transformation into graphical coordinates yields coordinates containing the value
AST__BAD).
-
If any marker position is clipped (see AST_CLIP), then the entire marker is not drawn.
-
An error results if the base Frame of the Plot is not 2-dimensional.
-
An error also results if the transformation between the current and base Frames of the Plot is not
defined (i.e. the Plot’ s TranInverse attribute is zero).
Copyright (C) 2021 East Asian Observatory
- ←Prev
- AST
A Library for Handling
World Coordinate
Systems
in Astronomy - Next→
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