DRAWPOLY

Draw a polygon

Description:

This routine draws a polygon using the data in the XCOL and YCOL areas to define the vertices of the region. The polygon is shaded using the current fill-area style attributes (see the FILLSTY command).

Usage:

drawpoly [fill]

Parameters:

FILL = _LOGICAL (Read)
Whether to fill the polygon or not. If TRUE then the current fill-area style attributes as set by the CHANGE command will be used. [TRUE]
PROJECTION = _CHAR (Read)
The geometry to be used for plotting the polygon. This is explained in more detail in the section on projections. Allowed values: "NONE", "TAN", "SIN", "ARC", "GLS", "AITOFF", "MERCATOR" and "STG".

[The value of the global parameter PONGO_PROJECTN is used. If PONGO_PROJECTN is not defined, the default value "NONE" is used.]

RACENTRE = _CHAR (Read)
The centre of the projection in RA (i.e. the angle must be specified as hh:mm:ss.sss). This parameter is only required for PROJECTION values other than "NONE".

[The value of the global parameter PONGO_RACENTRE is used. If PONGO_RACENTRE is not defined, the default value "0" is used.]

DECCENTRE = _CHAR (Read)
The centre of the projection in declination (i.e. the angle must be specified as dd:mm:ss.sss). This parameter is only required for PROJECTION values other than "NONE".

[The value of the global parameter PONGO_DECCENTRE is used. If PONGO_DECCENTRE is not defined, the default value "0" is used.]

Examples:

drawpoly
This draws a single polygon on the current graphics display. The polygon is filled or shaded using the current fill-hatch styles.
drawpoly projection=aitoff deccentre="12:00:00"
This draws a single polygon on the current graphics display. The polygon is filled or shaded using the current fill-hatch styles and the polygon is drawn using an AITOFF projection. The lines along the edges of the polygon are drawn as suitable arcs.

Notes: