<?php
/**
* google charts wrapper class
*
* @package Chart
* @author Chema Garrido <chema@garridodiaz.com>
* @see http://code.google.com/apis/chart/
* @see http://code.google.com/apis/ajax/playground/?type=visualization
*/
class Chart{
/**
*
* Used to know if we already used the google js api somewhere so we don't call it twice
* @var boolean
*/
private static $included_lib = FALSE;
/**
*
* get the JS library that we need to generate charts
* @param boolean $force forces the inclusion
* @return string
*/
public static function include_library($force = FALSE)
{
if (self::$included_lib == FALSE OR $force==TRUE)
{
self::$included_lib = TRUE;
return '<script src="https://www.google.com/jsapi" type="text/javascript"></script>'.PHP_EOL;
}
return FALSE;
}
/**
*
* generates a google chart, with the given information
* @param string $chart_type
* @param array $data
* @param array $options
* @return mixed boolean|string
*/
public static function corechart($chart_type='ColumnChart',$data,$options = NULL)
{
//list of availables charts
$corecharts = array('ColumnChart','AreaChart','LineChart','BarChart','BubbleChart','PieChart','GeoChart','Gauge');
if (!in_array($chart_type, $corecharts) OR !is_array($data))
return FALSE;
//Defaults in case options are not set
if ($options==NULL)
{
$options['title'] = 'Title here';
$options['height'] = 600;
$options['width'] = 600;
}
//getting the columns for the data
$columns = array();
foreach(reset($data) as $k=>$v)
{
$columns[$k] = (is_numeric($v))?'number':'string';
}
//name for the div where the chart appears
$chart_div = $chart_type.'_'.md5(uniqid(mt_rand(), false));
//Start chart JS generation
$ret = '';
$ret.=self::include_library();
$ret.='<script type="text/javascript">'.PHP_EOL;
//depending on the chart type load different vars
switch($chart_type)
{
case 'GeoChart':
$ret.='google.load("visualization", "1", {packages:["geochart"]});'.PHP_EOL;
$ret.='google.setOnLoadCallback(drawMarkersMap);'.PHP_EOL;
$ret.='function drawMarkersMap() {'.PHP_EOL;
break;
case 'Gauge':
$ret.='google.load("visualization", "1", {packages:["gauge"]});'.PHP_EOL;
$ret.='google.setOnLoadCallback(drawChart);'.PHP_EOL;
$ret.='function drawChart() {'.PHP_EOL;
break;
default:
$ret.='google.load("visualization", "1", {packages:["corechart"]});'.PHP_EOL;
$ret.='google.setOnLoadCallback(drawChart);'.PHP_EOL;
$ret.='function drawChart() {'.PHP_EOL;
}
$ret.='var data = new google.visualization.DataTable();'.PHP_EOL;
//chart columns
foreach ($columns as $k=>$v)
{
$ret.="data.addColumn('".$v."', '".$k."');".PHP_EOL;
}
//adding data to the chart
$ret.="data.addRows([";
foreach ($data as $d)
{
$ret.='[';
foreach ($d as $k=>$v)
{
$ret.= (is_numeric($v))? $v.',':"'".$v."',";
}
$ret.='],';
}
$ret.=']);'.PHP_EOL;
//adding the options
$ret.='var options = {';
foreach ($options as $k=>$v)
{
$ret.= $k.': ';
$ret.= (strpos($v,'{')!==FALSE OR is_numeric($k))? $v:'\''.$v.'\'';
$ret.= ',';
}
$ret.='};'.PHP_EOL;
//draw the chart
$ret.='var chart = new google.visualization.'.$chart_type.'(document.getElementById(\''.$chart_div.'\'));'.PHP_EOL;
$ret.='chart.draw(data, options);'.PHP_EOL;
$ret.='}</script>'.PHP_EOL.'<div id="'.$chart_div.'"></div>'.PHP_EOL;
return $ret;
}
/**
*
* Wrappers for self::corechart
*
* usage example common for all of them:
* <?=Chart::pie($products,array('title'=>'Productos','width'=>700,'height'=>600))?>
*
* @param array $data
* @param array $options
* @return mixed boolean|string
*/
//http://code.google.com/apis/chart/interactive/docs/gallery/piechart.html
public static function pie($data,$options = NULL,$is3D=TRUE)
{
if ($is3D==TRUE)
{
$options+=array('is3D'=>'true');
}
return self::corechart('PieChart',$data,$options);
}
//http://code.google.com/apis/chart/interactive/docs/gallery/columnchart.html
public static function column($data,$options = NULL)
{
return self::corechart('ColumnChart',$data,$options);
}
//http://code.google.com/apis/chart/interactive/docs/gallery/areachart.html
public static function area($data,$options = NULL)
{
return self::corechart('AreaChart',$data,$options);
}
//http://code.google.com/apis/chart/interactive/docs/gallery/linechart.html
public static function line($data,$options = NULL)
{
return self::corechart('LineChart',$data,$options);
}
//http://code.google.com/apis/chart/interactive/docs/gallery/barchart.html
public static function bar($data,$options = NULL)
{
return self::corechart('BarChart',$data,$options);
}
//http://code.google.com/apis/chart/interactive/docs/gallery/bubblechart.html
public static function bubble($data,$options = NULL)
{
return self::corechart('BubbleChart',$data,$options);
}
//http://code.google.com/apis/chart/interactive/docs/gallery/geochart.html
public static function geomarkers($data,$options = NULL,$region='ES')
{
$options+=array('region' => $region,
'displayMode' => 'markers',
'colorAxis' => "{colors: ['green', 'blue']}");
return self::corechart('GeoChart',$data,$options);
}
//http://code.google.com/apis/chart/interactive/docs/gallery/gauge.html
public static function gauge($data,$options = NULL)
{
$options+=array('redFrom' =>90,
'redTo' =>100,
'yellowFrom'=>75,
'yellowTo' =>90,
'minorTicks'=>5);
return self::corechart('Gauge',$data,$options);
}
}
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