Charts - Line Charts Menu - 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';

function 
make_def_dot()
{
  
$d = new dot();
  return 
$d->size(4)->halo_size(0);
}

$data = array();

for( 
$i=0$i<6.2$i+=0.2 )
{
  
$val = (sin($i) * 7) + 7;
  if( 
$val 11.5 )
    
$data[] = null;   // <-- LOOK!
  
else
    
$data[] = $val;

}

$title = new titledate("D M d Y") );

$line = new line();
$line->set_default_dot_style(make_def_dot());
$line->set_values$data );
$line->set_width);

$y = new y_axis();
$y->set_range015);


$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'.
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