NAME
Astro::SkyPlot - Create very basic sky plots
SYNOPSIS
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");
DESCRIPTION
A module to create very basic sky plots as EPS documents.
MARKERS
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
PROJECTIONS
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.
METHODS
new
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])
setcolor
Set a new drawing color. Takes three numbers corresponding to red, green and blue values between 0 and 255.
plot_lat_long
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
Write the plot to the specified EPS file.
ACCESSOR METHODS
The following are read only accessors unless otherwise noted.
marker
Get/Set the default marker type. The marker type for a single plot operation can be specified as an option to plot_lat_long
.
ps
Returns the internals PostScript::Simple
object.
xsize
Returns the image's width (in mm).
ysize
Returns the image's height (in mm).
PRIVATE METHODS
_draw_bg
Draws the plot's background.
_restore_color
Restores the previously saved color.
_plot_axis
Plot the sky-plot axis.
_project
Projects given lat/long to x/y to plot coordinates.
_draw_marker
Draws a marker at the given plot coordinates. Arguments $x, $y, $markerno, $size
.
SEE ALSO
For more general information on map projections: http://en.wikipedia.org/wiki/Map_projection
Map projections are implemented in Astro::MapProjection
AUTHOR
Steffen Mueller, <smueller@cpan.org>
COPYRIGHT AND LICENSE
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.