Astro::SkyPlot - Create very basic sky plots

  use Astro::SkyPlot qw/:all/; # export the markers
  my $plot = Astro::SkyPlot->new(); # use defaults (see below)

  # specify options yourself:
  $plot = Astro::SkyPlot->new(
    xsize       => 200, # mm
    ysize       => 200,
    bgcolor     => [0, 0, 0], # RGB => black
    projection  => 'hammer',
    axiscolor   => [100, 100, 100], # RGB => grey
  );

  $plot->setcolor(255, 0, 0); # RGB => red
  $plot->plot_lat_long(1, 1); # units: radians
  $plot->plot_lat_long(1, 1, size => 0.2, marker => MARK_CIRCLE); # units: radians, radians, mm
  $plot->write(file => "skyplot.eps");

A module to create very basic sky plots as EPS documents.

There are multiple types of markers that can be plotted into the sky plot. These are defined through constants that can be exported from the module:

  MARK_CIRCLE           => circular markers
  MARK_CIRCLE_FILLED    => filled circular markers
  MARK_BOX              => square markers
  MARK_BOX_FILLED       => filled square markers
  MARK_TRIANGLE         => triangularmarkers
  MARK_TRIANGLE_FILLED  => filled triangular markers
  MARK_DTRIANGLE        => downward triangular markers
  MARK_DTRIANGLE_FILLED => filled downward triangular markers
  MARK_CROSS            => cross shaped markers
  MARK_DIAGCROSS        => diagonal cross shaped markers

You can use the Hammer projection ("hammer"), the Sinusoidal projection ("sinusoidal"), and the Miller projection ("miller"). Default is "hammer". You can use the projection argument to the constructor to change this.

Cf. Astro::MapProjection for details on these projections and have a look at the default axes by running the examples/projections.pl example.

Constructor. Without arguments, uses the default settings (cf. SYNOPSIS). Supports the following options:

    xsize       => Plot x-size in mm (def: 200mm)
    ysize       => Plot y-size in mm (def: 200mm)
    bgcolor     => Background color as array reference
                   (RGB value 0-255 per component)
                   (def: black, [0, 0, 0])
    projection  => Projection type. Default: Hammer projection ('hammer')
    axiscolor   => Color for the axes. (def: grey, [100, 100, 100])

Set a new drawing color. Takes three numbers corresponding to red, green and blue values between 0 and 255.

Draw a new latitude/longitude point.

These may be followed by key/value pairs of options. Supported options:

size: the size (radius) of the point (default: 0.1mm)

marker: The type of marker to use (see MARKERS).

Write the plot to the specified EPS file.

The following are read only accessors unless otherwise noted.

Get/Set the default marker type. The marker type for a single plot operation can be specified as an option to plot_lat_long.

Returns the internals PostScript::Simple object.

Returns the image's width (in mm).

Returns the image's height (in mm).

Draws the plot's background.

Restores the previously saved color.

Plot the sky-plot axis.

Projects given lat/long to x/y to plot coordinates.

Draws a marker at the given plot coordinates. Arguments $x, $y, $markerno, $size.

For more general information on map projections: http://en.wikipedia.org/wiki/Map_projection

Map projections are implemented in Astro::MapProjection

Steffen Mueller, <smueller@cpan.org>

Copyright (C) 2009 by Steffen Mueller

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.0 or, at your option, any later version of Perl 5 you may have available.