1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
<?php
/*
* sspmod_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 sspmod_statistics_Graph_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 = $y;
}
private function encodeaxis($axis)
{
return join('|', $axis);
}
// t:10.0,58.0,95.0
private function encodedata($datasets)
{
$setstr = array();
foreach ($datasets as $dataset) {
$setstr[] = self::extEncode($dataset);
}
return 'e:' . join(',', $setstr);
}
public static function extEncode($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 $axis Axis
* @param $axpis Axis positions
* @param $datasets Datasets values
* @param $max Max value. Will be the topmost value on the Y-axis.
*/
public function show($axis, $axispos, $datasets, $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 $url;
}
public function showPie($axis, $datasets)
{
$url = 'https://chart.apis.google.com/chart?' .
// Dimension of graph. Default is 800x350
'chs=' . $this->x . 'x' . $this->y .
// Dateset values.
'&chd=' . $this->encodedata(array($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>' . $f . ' => ' . sspmod_statistics_Graph_GoogleCharts::roof($f);
* }
* </code>
*
* @param $max Input value.
*/
public static function roof($max)
{
$mul = 1;
if ($max < 1) {
return 1;
}
$t = intval(ceil($max));
while ($t > 100) {
$t /= 10;
$mul *= 10;
}
$maxGridLines = 10;
$candidates = array(1, 2, 5, 10, 20, 25, 50, 100);
foreach ($candidates as $c) {
if ($t / $c < $maxGridLines) {
$tick_y = $c * $mul;
$target_top = intval(ceil($max / $tick_y) * $tick_y);
return $target_top;
}
}
}
}
|
