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<?php
namespace SimpleSAML\Module\statistics\Graph;
/**
* \SimpleSAML\Module\statistics\Graph\GoogleCharts will help you to create a Google Chart
* using the Google Charts API.
*
* @author Andreas Åkre Solberg <andreas.solberg@uninett.no>
* @package SimpleSAMLphp
*/
class GoogleCharts
{
/** @var integer */
private $x;
/** @var integer */
private $y;
/**
* Constructor.
*
* Takes dimension of graph as parameters. X and Y.
*
* @param integer $x X dimension. Default 800.
* @param integer $y Y dimension. Default 350.
*/
public function __construct($x = 800, $y = 350)
{
$this->x = $x;
$this->y = $y;
}
/**
* @param array $axis
* @return string
*/
private function encodeaxis(array $axis)
{
return join('|', $axis);
}
/**
* t:10.0,58.0,95.0
* @param array $datasets
* @return string
*/
private function encodedata(array $datasets)
{
$setstr = [];
foreach ($datasets as $dataset) {
$setstr[] = self::extEncode($dataset);
}
return 'e:' . join(',', $setstr);
}
/**
* @param array $values
* @return string
*/
public static function extEncode(array $values) // $max = 4095, $min = 0
{
$extended_table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-.';
$chardata = '';
$delta = 4095;
$size = strlen($extended_table);
foreach ($values as $k => $v) {
if ($v >= 0 && $v <= 100) {
$first = substr($extended_table, intval(($delta * $v / 100) / $size), 1);
$second = substr($extended_table, intval(($delta * $v / 100) % $size), 1);
$chardata .= "$first$second";
} else {
$chardata .= '__'; // Value out of max range;
}
}
return $chardata;
}
/**
* Generate a Google Charts URL which points to a generated image.
* More documentation on Google Charts here:
* http://code.google.com/apis/chart/
*
* @param array $axis Axis
* @param array $axispos Axis positions
* @param array $datasets Datasets values
* @param array $maxes Max value. Will be the topmost value on the Y-axis.
* @return string
*/
public function show(array $axis, array $axispos, array $datasets, array $maxes)
{
$labeld = '&chxt=x,y' . '&chxr=0,0,1|1,0,' . $maxes[0];
if (count($datasets) > 1) {
if (count($datasets) !== count($maxes)) {
throw new \Exception('Incorrect number of max calculations for graph plotting.');
}
$labeld = '&chxt=x,y,r' . '&chxr=0,0,1|1,0,' . $maxes[0] . '|2,0,' . $maxes[1];
}
$url = 'https://chart.apis.google.com/chart?' .
// Dimension of graph. Default is 800x350
'chs=' . $this->x . 'x' . $this->y .
// Dateset values
'&chd=' . $this->encodedata($datasets) .
// Fill area...
'&chco=ff5c00,cca600' .
'&chls=1,1,0|1,6,3' .
// chart type is linechart
'&cht=lc' .
$labeld .
'&chxl=0:|' . $this->encodeaxis($axis) . #.$'|1:||top' .
'&chxp=0,' . join(',', $axispos) .
'&chg=' . (2400 / (count($datasets[0]) - 1)) . ',-1,3,3'; // lines
return $url;
}
/**
* @param array $axis
* @param array $datasets
* @return string
*/
public function showPie(array $axis, array $datasets)
{
$url = 'https://chart.apis.google.com/chart?' .
// Dimension of graph. Default is 800x350
'chs=' . $this->x . 'x' . $this->y .
// Dateset values.
'&chd=' . $this->encodedata([$datasets]) .
// chart type is linechart
'&cht=p' .
'&chl=' . $this->encodeaxis($axis);
return $url;
}
/**
* Takes a input value, and generates a value that suits better as a max
* value on the Y-axis. In example 37.6 will not make a good max value, instead
* it will return 40. It will always return an equal or larger number than it gets
* as input.
*
* Here is some test code:
* <code>
* $foo = array(
* 0, 2, 2.3, 2.6, 6, 10, 15, 98, 198, 256, 487, 563, 763, 801, 899, 999, 987, 198234.485, 283746
* );
* foreach ($foo as $f) {
* echo '<p>'.$f.' => '.\SimpleSAML\Module\statistics\Graph\GoogleCharts::roof($f);
* }
* </code>
*
* @param int $max Input value.
* @return int
*/
public static function roof($max)
{
$mul = 1;
if ($max < 1) {
return 1;
}
$t = intval(ceil($max));
while ($t > 100) {
$t /= 10;
$mul *= 10;
}
$maxGridLines = 10;
$candidates = [1, 2, 5, 10, 20, 25, 50, 100];
foreach ($candidates as $c) {
if ($t / $c < $maxGridLines) {
$tick_y = $c * $mul;
$target_top = intval(ceil($max / $tick_y) * $tick_y);
return $target_top;
}
}
return 1;
}
}
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