File Coverage

blib/lib/SVG/Sparkline/RangeArea.pm

Criterion	Covered	Total	%
statement	63	66	95.4
branch	7	8	87.5
condition			n/a
subroutine	9	10	90.0
pod	2	2	100.0
total	81	86	94.1

package SVG::Sparkline::RangeArea;

use warnings;
use strict;
use Carp;
use SVG;
use SVG::Sparkline::Utils;

use 5.008000;
our $VERSION = 1.12;

# aliases to make calling shorter.
*_f = *SVG::Sparkline::Utils::format_f;

sub valid_param {
    return scalar grep { $_[1] eq $_ } qw/xrange yrange/;
}

sub make
{
    my ($class, $args) = @_;
    # validate parameters
    SVG::Sparkline::Utils::validate_array_param( $args, 'values' );
    croak "'values' must be an array of pairs.\n"
        if grep { 'ARRAY' ne ref $_ || 2 != @{$_} } @{$args->{values}};
    my $valdesc = SVG::Sparkline::Utils::summarize_xy_values(
        [ (map { $_->[0] } @{$args->{values}}), (reverse map { $_->[1] } @{$args->{values}}) ]
    );
    $valdesc->{xrange} = $#{$args->{values}};
    $valdesc->{xmax} = $#{$args->{values}};
    my $off = $valdesc->{xrange};
    foreach my $v (@{$valdesc->{vals}}[($off+1) .. $#{$valdesc->{vals}}])
    {
        $v->[0] = $off--;
    }

    SVG::Sparkline::Utils::calculate_xscale( $args, $valdesc->{xrange} );
    SVG::Sparkline::Utils::calculate_yscale_and_offset( $args, $valdesc->{yrange}, $valdesc->{offset} );
    my $svg = SVG::Sparkline::Utils::make_svg( $args );

    my $points = SVG::Sparkline::Utils::xypairs_to_points_str(
        $valdesc->{vals}, $args->{xscale}, $args->{yscale}
    );
    $svg->polygon( fill=>$args->{color}, points=>$points, stroke=>'none' );

    if( exists $args->{mark} )
    {
        _make_marks( $svg,
            xscale=>$args->{xscale}, yscale=>$args->{yscale},
            values=>$args->{values}, mark=>$args->{mark},
            base=>$valdesc->{base}
        );
    }

    return $svg;
}

sub _make_marks
{
    my ($svg, %args) = @_;

    my @marks = @{$args{mark}};
    while(@marks)
    {
        my ($index,$color) = splice( @marks, 0, 2 );
        $index = SVG::Sparkline::Utils::range_mark_to_index( 'RangeArea', $index, $args{values} );
        _make_mark( $svg, %args, index=>$index, color=>$color );
    }
    return;
}

sub _make_mark
{
    my ($svg, %args) = @_;
    my $index = $args{index};
    my ($lo, $hi) = @{$args{values}->[$index]};
    my $y = _f( ($lo-$args{base}) * $args{yscale} );
    my $yh = _f( ($hi-$args{base}) * $args{yscale} );
    my $x = _f($index * $args{xscale});

    if(abs($hi-$lo) <= 0.01)
    {
        $svg->circle( cx=>$x, cy=>$y, r=>1, fill=>$args{color}, stroke=>'none' );
    }
    else
    {
        $svg->line( x1=>$x, y1=>$y, x2=>$x, y2=>$yh,
            fill=>'none', stroke=>$args{color}, 'stroke-width'=>1
        );
    }
    return;
}

1;

__END__