Free 2d software for linux

EMWave2D project is a 2D electromagnetic wave simulation program. It solves Maxwells equation using Finite Difference Time Domain (FDTD) method.

It is very simple program to use and to modify. It can do many different simulations such as scattering, diffraction, and refraction.

Eclipse is a set of C++ classes designed to give beginner developers a head start in developing their first games as well as more experienced developers who dont want to have to write code for mundane tasks like fonts, sprites, and image loading.

Eclipse 2D Game Engine provides bitmap fonts, window management, audio capabilities, image loading, error logging, and zip file support.

Games::OpenGL::Font::2D module can load/render 2D colored bitmap fonts via OpenGL.

SYNOPSIS

use Games::OpenGL::Font::2D;

my $font = Games::OpenGL::Font::2D->new(
file => font.bmp );

use SDL::App::FPS;

my $app = SDL::App::FPS->new( ... );

# dont forget to change these on resize events!
$font->screen_width( $app->width() );
$font->screen_height( $app->width() );

$font->pre_output(); # setup rendering for font

$font->color( [ 0,1,0] ); # yellow as array ref
$font->color( 1,0,0 ); # or red
$font->alpha( 0.8 ); # nearly opaque

# half-transparent, red
$font->output (100,100, Hello OpenGL!, [ 1,0,0], 0.5 );
# using the $fonts color and alpha
$font->output (100,200, Hello OpenGL! );

$font->transparent( 1 ); # render font background transparent

$font->spacing_y( 16 ); # render vertical (costly rebuild!)
$font->spacing_x( 0 ); # (costly rebuild!)
$font->output (100,200, Hello OpenGL! );

$font->post_output(); # if wanted, you can reset OpenGL

EXPORTS

Exports nothing on default. Can export on demand the following:

FONT_ALIGN_LEFT
FONT_ALIGN_RIGHT
FONT_ALIGN_CENTER
FONT_ALIGN_TOP
FONT_ALIGN_BOTTOM

Text::NSP::Measures::2D::MI::pmi is a Perl module that implements Pointwise Mutual Information.

SYNOPSIS

Basic Usage

use Text::NSP::Measures::2D::MI::pmi;

my $npp = 60; my $n1p = 20; my $np1 = 20; my $n11 = 10;

$pmi_value = calculateStatistic( n11=>$n11,
n1p=>$n1p,
np1=>$np1,
npp=>$npp);

if( ($errorCode = getErrorCode()))
{
print STDERR $errorCode." - ".getErrorMessage()."n"";
}
else
{
print getStatisticName."value for bigram is ".$pmi_value."n"";
}

Text::NSP::Measures::2D::CHI::x2 is a Perl module that implements Pearsons chi squared measure of association for bigrams.

SYNOPSIS

Basic Usage

use Text::NSP::Measures::2D::CHI::x2;

my $npp = 60; my $n1p = 20; my $np1 = 20; my $n11 = 10;

$x2_value = calculateStatistic( n11=>$n11,
n1p=>$n1p,
np1=>$np1,
npp=>$npp);

if( ($errorCode = getErrorCode()))
{
print STDERR $errorCode." - ".getErrorMessage()."n"";
}
else
{
print getStatisticName."value for bigram is ".$x2_value."n"";
}

Text::NSP::Measures::2D::MI::ps is a Perl module that implements Poisson-Stirling measure of association for bigrams.

SYNOPSIS

Basic Usage

use Text::NSP::Measures::2D::MI::ps;

my $npp = 60; my $n1p = 20; my $np1 = 20; my $n11 = 10;

$ps_value = calculateStatistic( n11=>$n11,
n1p=>$n1p,
np1=>$np1,
npp=>$npp);

if( ($errorCode = getErrorCode()))
{
print STDERR $errorCode." - ".getErrorMessage()."n"";
}
else
{
print getStatisticName."value for bigram is ".$ps_value."n"";
}

The log-likelihood ratio measures the devitation between the observed data and what would be expected if < word1 > and < word2 > were independent. The higher the score, the less evidence there is in favor of concluding that the words are independent.

Assume that the frequency count data associated with a bigram < word1 >< word2 > as shown by a 2x2 contingency table:

word2 ~word2
word1 n11 n12 | n1p
~word1 n21 n22 | n2p
--------------
np1 np2 npp

where n11 is the number of times < word1 >< word2 > occur together, and n12 is the number of times < word1 > occurs with some word other than word2, and n1p is the number of times in total that word1 occurs as the first word in a bigram.

The expected values for the internal cells are calculated by taking the product of their associated marginals and dividing by the sample size, for example:

np1 * n1p
m11= ---------
npp

The poisson stirling measure is a negative lograthimic approximation of the poisson-likelihood measure. It uses the stirlings firmula to approximate the factorial in poisson-likelihood measure.

Posson-Stirling = n11 * ( log(n11) - log(m11) - 1)

which is same as

Posson-Stirling = n11 * ( log(n11/m11) - 1)

Methods

calculateStatistic() - This method calculates the ps value

INPUT PARAMS : $count_values .. Reference of an hash containing the count values computed by the count.pl program.

RETURN VALUES : $poissonStirling .. Poisson-Stirling value for this bigram.

getStatisticName() - Returns the name of this statistic

INPUT PARAMS : none

RETURN VALUES : $name .. Name of the measure.

Text::NSP::Measures::2D::Fisher::left is a Perl module implementation of the left sided Fishers exact test.

SYNOPSIS

Basic Usage

use Text::NSP::Measures::2D::Fisher::left;

my $npp = 60; my $n1p = 20; my $np1 = 20; my $n11 = 10;

$left_value = calculateStatistic( n11=>$n11,
n1p=>$n1p,
np1=>$np1,
npp=>$npp);

if( ($errorCode = getErrorCode()))
{
print STDERR $errorCode." - ".getErrorMessage();
}
else
{
print getStatisticName."value for bigram is ".$left_value;
}