File Coverage

blib/lib/Excel/Writer/XLSX/Chart/Scatter.pm

Criterion	Covered	Total	%
statement	128	132	96.9
branch	22	22	100.0
condition	5	5	100.0
subroutine	15	16	93.7
pod	1	2	50.0
total	171	177	96.6

package Excel::Writer::XLSX::Chart::Scatter;

###############################################################################
#
# Scatter - A class for writing Excel Scatter charts.
#
# Used in conjunction with Excel::Writer::XLSX::Chart.
#
# See formatting note in Excel::Writer::XLSX::Chart.
#
# Copyright 2000-2019, John McNamara, [e-mail]
#
# Documentation after __END__
#

# perltidy with the following options: -mbl=2 -pt=0 -nola

use 5.008002;
use strict;
use warnings;
use Carp;
use Excel::Writer::XLSX::Chart;

our @ISA     = qw(Excel::Writer::XLSX::Chart);
our $VERSION = '1.03';


###############################################################################
#
# new()
#
#
sub new {

    my $class = shift;
    my $self  = Excel::Writer::XLSX::Chart->new( @_ );

    $self->{_subtype}           = $self->{_subtype} || 'marker_only';
    $self->{_cross_between}     = 'midCat';
    $self->{_horiz_val_axis}    = 0;
    $self->{_val_axis_postion}  = 'b';
    $self->{_smooth_allowed}    = 1;
    $self->{_requires_category} = 1;

    # Set the available data label positions for this chart type.
    $self->{_label_position_default} = 'right';
    $self->{_label_positions} = {
        center      => 'ctr',
        right       => 'r',
        left        => 'l',
        above       => 't',
        below       => 'b',
        # For backward compatibility.
        top         => 't',
        bottom      => 'b',
    };

    bless $self, $class;
    return $self;
}


###############################################################################
#
# combine()
#
# Override parent method to add a warning.
#
sub combine {

    my $self  = shift;
    my $chart = shift;

    carp 'Combined chart not currently supported with scatter chart ' .
      'as the primary chart';
    return;
}


##############################################################################
#
# _write_chart_type()
#
# Override the virtual superclass method with a chart specific method.
#
sub _write_chart_type {

    my $self = shift;

    # Write the c:scatterChart element.
    $self->_write_scatter_chart( @_ );
}


##############################################################################
#
# _write_scatter_chart()
#
# Write the  element.
#
sub _write_scatter_chart {

    my $self = shift;
    my %args = @_;

    my @series;
    if ( $args{primary_axes} ) {
        @series = $self->_get_primary_axes_series;
    }
    else {
        @series = $self->_get_secondary_axes_series;
    }

    return unless scalar @series;

    my $style   = 'lineMarker';
    my $subtype = $self->{_subtype};

    # Set the user defined chart subtype.

    if ($subtype eq 'marker_only') {
        $style = 'lineMarker';
    }

    if ($subtype eq 'straight_with_markers') {
        $style = 'lineMarker';
    }

    if ($subtype eq 'straight') {
        $style = 'lineMarker';
        $self->{_default_marker} = { type => 'none' };
    }

    if ($subtype eq 'smooth_with_markers') {
        $style = 'smoothMarker';
    }

    if ($subtype eq 'smooth') {
        $style = 'smoothMarker';
        $self->{_default_marker} = { type => 'none' };
    }

    # Add default formatting to the series data.
    $self->_modify_series_formatting();

    $self->xml_start_tag( 'c:scatterChart' );

    # Write the c:scatterStyle element.
    $self->_write_scatter_style( $style );

    # Write the series elements.
    $self->_write_ser( $_ ) for @series;

    # Write the c:axId elements
    $self->_write_axis_ids( %args );

    $self->xml_end_tag( 'c:scatterChart' );
}


##############################################################################
#
# _write_ser()
#
# Over-ridden to write c:xVal/c:yVal instead of c:cat/c:val elements.
#
# Write the  element.
#
sub _write_ser {

    my $self   = shift;
    my $series = shift;
    my $index  = $self->{_series_index}++;

    $self->xml_start_tag( 'c:ser' );

    # Write the c:idx element.
    $self->_write_idx( $index );

    # Write the c:order element.
    $self->_write_order( $index );

    # Write the series name.
    $self->_write_series_name( $series );

    # Write the c:spPr element.
    $self->_write_sp_pr( $series );

    # Write the c:marker element.
    $self->_write_marker( $series->{_marker} );

    # Write the c:dPt element.
    $self->_write_d_pt( $series->{_points} );

    # Write the c:dLbls element.
    $self->_write_d_lbls( $series->{_labels} );

    # Write the c:trendline element.
    $self->_write_trendline( $series->{_trendline} );

    # Write the c:errBars element.
    $self->_write_error_bars( $series->{_error_bars} );

    # Write the c:xVal element.
    $self->_write_x_val( $series );

    # Write the c:yVal element.
    $self->_write_y_val( $series );

    # Write the c:smooth element.
    if ( $self->{_subtype} =~ /smooth/ && !defined $series->{_smooth} ) {
        # Default is on for smooth scatter charts.
        $self->_write_c_smooth( 1 );
    }
    else {
        $self->_write_c_smooth( $series->{_smooth} );
    }

    $self->xml_end_tag( 'c:ser' );
}


##############################################################################
#
# _write_plot_area()
#
# Over-ridden to have 2 valAx elements for scatter charts instead of
# catAx/valAx.
#
# Write the  element.
#
sub _write_plot_area {

    my $self = shift;

    $self->xml_start_tag( 'c:plotArea' );

    # Write the c:layout element.
    $self->_write_layout( $self->{_plotarea}->{_layout}, 'plot' );

    # Write the subclass chart type elements for primary and secondary axes.
    $self->_write_chart_type( primary_axes => 1 );
    $self->_write_chart_type( primary_axes => 0 );

    # Write c:catAx and c:valAx elements for series using primary axes.
    $self->_write_cat_val_axis(
        x_axis   => $self->{_x_axis},
        y_axis   => $self->{_y_axis},
        axis_ids => $self->{_axis_ids},
        position => 'b',
    );

    my $tmp = $self->{_horiz_val_axis};
    $self->{_horiz_val_axis} = 1;
    $self->_write_val_axis(
        x_axis   => $self->{_x_axis},
        y_axis   => $self->{_y_axis},
        axis_ids => $self->{_axis_ids},
        position => 'l',
    );
    $self->{_horiz_val_axis} = $tmp;

    # Write c:valAx and c:catAx elements for series using secondary axes.
    $self->_write_cat_val_axis(
        x_axis   => $self->{_x2_axis},
        y_axis   => $self->{_y2_axis},
        axis_ids => $self->{_axis2_ids},
        position => 'b',
    );
    $self->{_horiz_val_axis} = 1;
    $self->_write_val_axis(
        x_axis   => $self->{_x2_axis},
        y_axis   => $self->{_y2_axis},
        axis_ids => $self->{_axis2_ids},
        position => 'l',
    );

    # Write the c:spPr element for the plotarea formatting.
    $self->_write_sp_pr( $self->{_plotarea} );

    $self->xml_end_tag( 'c:plotArea' );
}


##############################################################################
#
# _write_x_val()
#
# Write the  element.
#
sub _write_x_val {

    my $self    = shift;
    my $series  = shift;
    my $formula = $series->{_categories};
    my $data_id = $series->{_cat_data_id};
    my $data    = $self->{_formula_data}->[$data_id];

    $self->xml_start_tag( 'c:xVal' );

    # Check the type of cached data.
    my $type = $self->_get_data_type( $data );

    # TODO. Can a scatter plot have non-numeric data.

    if ( $type eq 'str' ) {

        # Write the c:numRef element.
        $self->_write_str_ref( $formula, $data, $type );
    }
    else {

        # Write the c:numRef element.
        $self->_write_num_ref( $formula, $data, $type );
    }

    $self->xml_end_tag( 'c:xVal' );
}


##############################################################################
#
# _write_y_val()
#
# Write the  element.
#
sub _write_y_val {

    my $self    = shift;
    my $series  = shift;
    my $formula = $series->{_values};
    my $data_id = $series->{_val_data_id};
    my $data    = $self->{_formula_data}->[$data_id];

    $self->xml_start_tag( 'c:yVal' );

    # Unlike Cat axes data should only be numeric.

    # Write the c:numRef element.
    $self->_write_num_ref( $formula, $data, 'num' );

    $self->xml_end_tag( 'c:yVal' );
}


##############################################################################
#
# _write_scatter_style()
#
# Write the  element.
#
sub _write_scatter_style {

    my $self = shift;
    my $val  = shift;

    my @attributes = ( 'val' => $val );

    $self->xml_empty_tag( 'c:scatterStyle', @attributes );
}


##############################################################################
#
# _modify_series_formatting()
#
# Add default formatting to the series data unless it has already been
# specified by the user.
#
sub _modify_series_formatting {

    my $self    = shift;
    my $subtype = $self->{_subtype};

    # The default scatter style "markers only" requires a line type.
    if ( $subtype eq 'marker_only' ) {

        # Go through each series and define default values.
        for my $series ( @{ $self->{_series} } ) {

            # Set a line type unless there is already a user defined type.
            if ( !$series->{_line}->{_defined} ) {
                $series->{_line} = {
                    width    => 2.25,
                    none     => 1,
                    _defined => 1,
                };
            }
        }
    }
}


##############################################################################
#
# _write_d_pt_point()
#
# Write an individual  element. Override the parent method to add
# markers.
#
sub _write_d_pt_point {

    my $self   = shift;
    my $index = shift;
    my $point = shift;

        $self->xml_start_tag( 'c:dPt' );

        # Write the c:idx element.
        $self->_write_idx( $index );

        $self->xml_start_tag( 'c:marker' );

        # Write the c:spPr element.
        $self->_write_sp_pr( $point );

        $self->xml_end_tag( 'c:marker' );

        $self->xml_end_tag( 'c:dPt' );
}


1;


__END__