data compression

[dogmatic69]

<? http://james.cridland.net/code/google-chart.html

// Here's an array containing some data to plot $test_data=array(0.5,6,12,17,2,0.3,9);

// Here's where we call the chart, and return the encoded chart data echo "<img src=http://chart.apis.google.com/chart?chtt=".urlencode("It's an example!")."&cht=lc&chs=450x125&chd=".chart_data($test_data).">";

// And here's the function

function chart_data($values) {

// Port of JavaScript from http://code.google.com/apis/chart/ // http://james.cridland.net/code

// First, find the maximum value from the values given

$maxValue = max($values);

// A list of encoding characters to help later, as per Google's example $simpleEncoding = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

$chartData = "s:"; for ($i = 0; $i < count($values); $i++) { $currentValue = $values[$i];

if ($currentValue > -1) {
$chartData.=substr($simpleEncoding,61*($currentValue/$maxValue),1);
}
  else {
  $chartData.='_';
  }

}

// Return the chart data - and let the Y axis to show the maximum value return $chartData."&chxt=y&chxl=0:|0|".$maxValue; }

?>