Free line software for linux

catfish is a handy file search tool using different backends which is configurable via the command line.

This program acts as a frontend for different file search engines. The interface is intentionally lightweight and simple. But it takes configuration options from the command line.

Currently find, (s)locate, tracker and beagle are supported as backends.

PyPar2 is a frontend for the Linux par2 command line, written in Python. PyPar2s GUI uses GTK through the PyGTK library.

The current version does not handle the creation of par2 files, only repairing and verifying are available.

Herrie is a command line music player. It has a split-screen file manager and playlist interface and supports a number of file formats (MP3, Ogg Vorbis, wave, FLAC, etc).

Herrie also has some nice features, including a chroot() function for untrusted setups (remote logins, parties, etc). AudioScrobbler is also implemented using Curl.

gimmage is an image viewer that is perfect for command line usage as it accepts directories and image filenames as arguments.

It has an in-application file browser that allows users to select and drag images and directories into the image viewing area in order to have them displayed.

AVScan is an AntiVirus scanner front end for ClamAV.

A front end for the Clam AntiVirus scanner using Endeavour Mark II. Features a scan list for frequently scanned locations, freshclam update support, and command line calling from Endeavour.

Algorithm::Line::Bresenham is a Perl module that contains a simple pixellated line-drawing algorithm.

SYNOPSIS

use Algorithm::Line::Bresenham qw/line/;
my @points = line(3,3 => 5,0);
# returns the list: [3,3], [4,2], [4,1], [5,0]
line(3,3 => 5,0, &draw_line);
# calls draw_line on each point in turn

Bresenham is one of the canonical line drawing algorithms for pixellated grids. Given a start and an end-point, Bresenham calculates which points on the grid need to be filled to generate the line between them.

Googling for Bresenham, and line drawing algorithms gives some good overview. The code here takes its starting point from Mark Feldmans Pascal code in his article Bresenhams Line and Circle Algorithms at http://www.gamedev.net/reference/articles/article767.asp.

FUNCTIONS

line

line ($from_y, $from_x => $to_y, $to_x);

Generates a list of all the intermediate points. This is returned as a list of array references.

line ($from_y, $from_x => $to_y, $to_x, &callback);

Calls the referenced function on each point in turn. The callback could be used to actually draw the point. Returns the collated return values from the callback.
circle

my @points = circle ($y, $x, $radius)

Returns the points to draw a circle with