Add use strict, use warnings to modules.

lib/Fun.pm

@@ -201,8 +201,8 @@ my $FUNCTION_REFERENCE = "Fun";
 
 my %fields = (
 	tstart => -1,           # (tstart,$tstop) constitutes the domain
-	tstop  => 1,
-	steps  => 50,
+	tstop  =>  1,
+	steps  =>  50,
 	color  => 'blue',
 	x_rule => \&identity,
 	y_rule => \&identity,

lib/Hermite.pm

@@ -233,7 +233,7 @@ sub internal_critical_points {
 }
 
 sub internal_inflection_points {
-	my ($x0, $l, $lp,, $x1, $r, $rp, $rh_roots, $rf_function) = @_;
+	my ($x0, $l, $lp, $x1, $r, $rp, $rh_roots, $rf_function) = @_;
 	#data for one segment of the hermite spline
 
 	# coefficients for the approximating polynomial

lib/Label.pm

@@ -42,6 +42,9 @@ This module defines labels for the graph objects (WWPlot).
 package Label;
 
 use strict;
+use warnings;
+
+use GD;
 
 #use Exporter;
 #use DynaLoader;

lib/Plots/Axes.pm

@@ -190,6 +190,9 @@ be visible after the fill, otherwise the fill will cover the axis. Default: 0
 
 package Plots::Axes;
 
+use strict;
+use warnings;
+
 sub new {
 	my $class = shift;
 	my $self  = {
@@ -214,9 +217,9 @@ sub new {
 sub axis_defaults {
 	my ($self, $axis) = @_;
 	return (
-		visible    => 1,
+		visible    =>  1,
 		min        => -5,
-		max        => 5,
+		max        =>  5,
 		label      => $axis eq 'y' ? '\(y\)'  : '\(x\)',
 		location   => $axis eq 'y' ? 'center' : 'middle',
 		position   => 0,
@@ -329,4 +332,4 @@ sub bounds {
 	return $self->{xaxis}{min}, $self->{yaxis}{min}, $self->{xaxis}{max}, $self->{yaxis}{max};
 }
 
-1;
+1;

lib/Plots/Data.pm

@@ -107,6 +107,9 @@ to add / change the styles.
 
 package Plots::Data;
 
+use strict;
+use warnings;
+
 sub new {
 	my $class = shift;
 	my $self  = {
@@ -168,7 +171,7 @@ sub set_function {
 		sub_x => sub { return $_[0]; },
 		sub_y => sub { return $_[0]; },
 		min   => -5,
-		max   => 5,
+		max   =>  5,
 		@_
 	};
 	$self->style(steps => $self->{function}{steps}) if $self->{funciton}{steps};

lib/Plots/GD.pm

@@ -23,6 +23,11 @@ See L<plots.pl> for more details.
 
 package Plots::GD;
 
+use GD;
+
+use strict;
+use warnings;
+
 sub new {
 	my ($class, $pgplot) = @_;
 	my $self = {
@@ -382,4 +387,4 @@ sub draw {
 	return $pgplot->ext eq 'gif' ? $self->im->gif : $self->im->png;
 }
 
-1;
+1;

lib/Plots/Plot.pm

@@ -23,17 +23,20 @@ See L<plots.pl> for more details.
 
 package Plots::Plot;
 
+use strict;
+use warnings;
+
 use Plots::Axes;
 use Plots::Data;
-use Plots::GD;
 use Plots::Tikz;
+use Plots::GD;
 
 sub new {
 	my ($class, $pg, @opts) = @_;
-	my $size  = $main::envir{onTheFlyImageSize} || 500;
+	my $size = $pg->{envir}{onTheFlyImageSize} || 500;
 
 	my $self = {
-		pg => $pg,
+		pg        => $pg,
 		imageName => {},
 		type      => 'Tikz',
 		ext       => 'svg',
@@ -158,15 +161,15 @@ sub image_type {
 # Tikz needs to use pdf for hardcopy generation.
 sub ext {
 	my $self = shift;
-	return 'pdf' if ($self->{type} eq 'Tikz' && $main::displayMode eq 'TeX');
+	return 'pdf' if ($self->{type} eq 'Tikz' && $self->{pg}{displayMode} eq 'TeX');
 	return $self->{ext};
 }
 
 # Return a copy of the tikz code (available after the image has been drawn).
 # Set $plot->{tikzDebug} to 1 to just generate the tikzCode, and not create a graph.
 sub tikz_code {
 	my $self = shift;
-	return ($self->{tikzCode} && $main::displayMode =~ /HTML/) ? '<pre>' . $self->{tikzCode} . '</pre>' : '';
+	return ($self->{tikzCode} && $self->{pg}{displayMode} =~ /HTML/) ? '<pre>' . $self->{tikzCode} . '</pre>' : '';
 }
 
 # Add functions to the graph.

lib/Plots/Tikz.pm

@@ -21,9 +21,11 @@ See L<plots.pl> for more details.
 
 =cut
 
-
 package Plots::Tikz;
 
+use strict;
+use warnings;
+
 sub new {
 	my ($class, $pgplot) = @_;
 	my $image = new LaTeXImage;

lib/Regression.pm

@@ -431,9 +431,9 @@ if (DEBUGGING) {
 
 	my $reg = Statistics::Regression->new(3, "sample regression", [ "const", "someX", "someY" ]);
 	$reg->include(2.0,  [ 1.0, 3.0,  -1.0 ]);
-	$reg->include(1.0,  [ 1.0, 5.0,  2.0 ]);
-	$reg->include(20.0, [ 1.0, 31.0, 0.0 ]);
-	$reg->include(15.0, [ 1.0, 11.0, 2.0 ]);
+	$reg->include(1.0,  [ 1.0, 5.0,   2.0 ]);
+	$reg->include(20.0, [ 1.0, 31.0,  0.0 ]);
+	$reg->include(15.0, [ 1.0, 11.0,  2.0 ]);
 
 	#  $reg->print();   or: my $coefs= $reg->theta(); print @coefs; print $reg->rsq;
 	# my $coefs= $reg->theta(); print $coeff[0];