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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 title( date("D M d Y") );
$line = new line();
$line->set_default_dot_style(make_def_dot());
$line->set_values( $data );
$line->set_width( 2 );
$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();
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