Chart Elements - Null Values

All charts support null values. Line and area charts simply skipp the null values, bar charts do not display a bar and pie charts do not display a pie slice.

This goes into the <head> of the page:

<script type="text/javascript" src="js/swfobject.js"></script>
<script type="text/javascript">
swfobject.embedSWF(
"open-flash-chart.swf", "my_chart", "550", "200",
"9.0.0", "expressInstall.swf",
{"data-file":"gallery/null-values.php"} );
</script>
This writes the chart into a div with id="my_chart", right click and view source to see it in action, [the tutorials have more details]

gallery/null-values.php
<?php

include '../php-ofc-library/open-flash-chart.php';

$data = array();

for( $i=0; $i<6.2; $i+=0.2 )
{
  if( $i>3 && $i<4 )
    $data[] = null;
  else
    $data[] = (sin($i) * 7) + 7;

}

$title = new title( date("D M d Y") );

$line = new line_dot();
$line->set_values( $data );
$line->set_halo_size( 0 );
$line->set_width( 2 );
$line->set_dot_size( 4 );

$y = new y_axis();
$y->set_range( 0, 15, 5 );


$chart = new open_flash_chart();
$chart->set_title( $title );
$chart->add_element( $line );
$chart->set_y_axis( $y );

echo $chart->toPrettyString();
To see the data produced : gallery/null-values.php, then 'view source'.
Support This Project
Adverts:

AnyChart - flash charts, maps and dashboards



Open Flash Chart logo by numb.me.uk. | Syntax highlights are by GeSHi