This is a bar chart showing data per year. Because the Y values are so large, we enable numeric formatting of Y labels, with precision 0. This results in a comma separator between thousands. This example also shows how to force the Y tick marks to start at zero and use a nice whole number for the tick interval.
Example 5.6. Bar Chart - Label Options
<?php
# PHPlot Example: Bar chart, annual data
require_once 'phplot.php';
$data = array(
array('1985', 340), array('1986', 682), array('1987', 1231),
array('1988', 2069), array('1989', 3509), array('1990', 5283),
array('1991', 7557), array('1992', 11033), array('1993', 16009),
array('1994', 24134), array('1995', 33768), array('1996', 44043),
array('1997', 55312), array('1998', 69209), array('1999', 86047),
array('2000', 109478), array('2001', 128375), array('2002', 140767),
);
$plot = new PHPlot(800, 600);
$plot->SetImageBorderType('plain');
$plot->SetPlotType('bars');
$plot->SetDataType('text-data');
$plot->SetDataValues($data);
# Let's use a new color for these bars:
$plot->SetDataColors('magenta');
# Force bottom to Y=0 and set reasonable tick interval:
$plot->SetPlotAreaWorld(NULL, 0, NULL, NULL);
$plot->SetYTickIncrement(10000);
# Format the Y tick labels as numerics to get thousands separators:
$plot->SetYLabelType('data');
$plot->SetPrecisionY(0);
# Main plot title:
$plot->SetTitle('US Cell Phone Subscribership');
# Y Axis title:
$plot->SetYTitle('Thousands of Subscribers');
# Turn off X tick labels and ticks because they don't apply here:
$plot->SetXTickLabelPos('none');
$plot->SetXTickPos('none');
$plot->DrawGraph();