<?php
namespace Jackbooted\Html;
/**
* Wrapper for Google Charts API
* @copyright Confidential and copyright (c) 2016 Jackbooted Software. All rights reserved.
*
* Written by Brett Dutton of Jackbooted Software
* brett at brettdutton dot com
*
* This software is written and distributed under the GNU General Public
* License which means that its source code is freely-distributed and
* available to the general public.
*
* http://code.google.com/apis/chart/docs/gallery/bar_charts.html
* http://code.google.com/apis/chart/docs/chart_params.html
*/
class GoogleChartAPI extends \Jackbooted\Util\JB {
private static $URL;
public static function init () {
if ( isset ( $_SERVER['HTTPS'] ) && $_SERVER['HTTPS'] == 'on' ) {
self::$URL = 'https://chart.googleapis.com/chart?';
}
else {
self::$URL = 'http://chart.googleapis.com/chart?';
}
}
public static function create () {
return new GoogleChartAPI ();
}
private $params = array ();
public function __construct () {
}
public function add ( $key, $value ) {
$this->params[$key] = $value;
return $this;
}
public function autoValues ( /* var args */ ) {
$allValues = func_get_args ();
$combinedList = array ();
foreach ( $allValues as $values ) {
$combinedList = array_merge ( $values, $combinedList );
}
$max = (int)ceil ( max ( $combinedList ) );
$min = (int)floor ( min ( $combinedList ) );
$range = $max - $min;
if ( abs ( $range ) < 0.00001 ) {
$min = 0;
$range = $max - $min;
if ( abs ( $range ) < 0.00001 ) {
return false;
}
}
$valuesStrings = array ();
foreach ( $allValues as $values ) {
foreach ( $values as $idx => $val ) {
$values[$idx] = (int)( ( $values[$idx] - $min ) * 100.0 / $range );
}
$valuesStrings[] = join ( ',', $values );
}
$step = $range / 5.0;
if ( $step > 3 ) $step = (int)floor ( $step );
return $this->add ( 'chxr', "1,{$min},{$max},{$step}" )
->add ( 'chg', '0,10' )
->add ( 'chd', 't:' . join ( '|', $valuesStrings ) );
}
public function __toString () {
return Tag::img ( self::$URL . http_build_query ( $this->params ) );
}
}
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