# AIPS HELP file for COSTAR in 31DEC24

#### As of Thu May 23 21:53:19 2024

COSTAR: Verb to plot a symbol at a coordinate on the TV

### INPUTS

```COORDINA                           Coordinate in image
SYMBOL          0.0        24.0    Symbol type: 1 plus 2 X,
3 circle, 4 box, see HELP
STFACTOR    -9999.0      9999.0    Scale radius = 2 pixels *
STFACTOR
GRCHAN          0.0         8.0    Graphics channel 0 => 2.
Choice of image to plot is done via TV cursor
(if more than one image of a map is visible)
```

### HELP SECTION

```COSTAR
Type: Verb
Use:  COSTAR will plot a symbol at a coordinate position for an image on
the TV.  If there is more than one image (of a map) visible on the
TV, the routine will ask the user to position the cursor on any
part of the image he wishes starred and then to press any button.
COORDINA....The X and Y coordinates are found as:
Xpos = abs(CO(1)) + abs(CO(2))/60 + abs(CO(3))/3600
if any of CO(1), CO(2), CO(3) < 0: Xpos = -Xpos
Ypos = abs(CO(4)) + abs(CO(5))/60 + abs(CO(6))/3600
if any of CO(4), CO(5), CO(6) < 0: Ypos = -Ypos
Note that, although these are most suited to RA, Dec in
sexagesimal notation, they can be used for any type of
coordinate.  The units are standard FITS units (e.g
degrees, m/sec, Hz, sec, etc.) except that right
ascensions are in hours of time.
SYMBOL......Types supported are
1: Plus sign           13: Star of David
2: Cross (X)           14: Seven-pointed star
3: Circle              15: Eight-pointed star
4: Box                 16: Nine-pointed star
5: Triangle            17: Ten-pointed star
6: Diamond             18: 11-pointed star
7: Pentagon            19: 12-pointed star
8: Hexagon             20: 13-pointed star
9: Septagon            21: 14-pointed star
10: Octagon            22: Plus (+) with gap
11: Nine-gon           23: Cross (X) with gap
12: Five pointed star  24: Vertical line
STFACTOR....Scale factor used to multiply symbol size: radius is
2 pixels * STFACTOR.
GRCHAN......Graphics channel (1 - 7) to use for line drawing.
0 => 2.
```

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